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硅油和矿物油混合液分层速度的影响因素 被引量:1
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作者 张美琼 何军 +1 位作者 马蕊燕 张静 《炼油与化工》 CAS 2022年第6期33-35,共3页
此项研究进行了硅油和矿物油的混合试验和2者混合液的分层试验,考察了硅油和矿物油混合液分层速度的影响因素。研究结果:硅油和矿物油相互是不溶解的,即使升高温度,也不能让它们互溶;影响硅油和矿物油混合液分层快慢的因素有硅油占混合... 此项研究进行了硅油和矿物油的混合试验和2者混合液的分层试验,考察了硅油和矿物油混合液分层速度的影响因素。研究结果:硅油和矿物油相互是不溶解的,即使升高温度,也不能让它们互溶;影响硅油和矿物油混合液分层快慢的因素有硅油占混合液的比例、混合方式、存放混合液的温度,混合液总量和存放混合液的容器形状不影响分层速度。 展开更多
关键词 硅油和矿物油混合 混合液分层 分层速度 影响因素
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分层速度和平均速度时深转换运用比较
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作者 王晶 李京涛 王燕 《山东煤炭科技》 2011年第3期165-167,共3页
地震勘探中用地层速度和旅行时间来进行时深转换获得目的层的埋藏深度。其中速度的选定是关键,根据实际地质情况选取不同的速度计算方式往往计算的结果有所偏差。该文拟就分层速度和平均速度在实际地震勘探中的运用情况进行比较,浅议如... 地震勘探中用地层速度和旅行时间来进行时深转换获得目的层的埋藏深度。其中速度的选定是关键,根据实际地质情况选取不同的速度计算方式往往计算的结果有所偏差。该文拟就分层速度和平均速度在实际地震勘探中的运用情况进行比较,浅议如何根据实际需要优先选取层速度或者平均速度。 展开更多
关键词 分层速度 平均速度 时深转换
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基于人工地震记录对几种P波速度模型的检测
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作者 金震 李军 《地震工程与工程振动》 CSCD 北大核心 2014年第3期47-54,共8页
通过对福建地区不同地壳速度模型计算的理论面波(瑞利波和勒夫波)波形与由相同测线上观测到的噪声记录提取的面波格林函数进行比较,对各种模型理论面波波形与实际观测噪声面波格林函数的拟合程度进行评价,进而定性分析各个地壳速度结构... 通过对福建地区不同地壳速度模型计算的理论面波(瑞利波和勒夫波)波形与由相同测线上观测到的噪声记录提取的面波格林函数进行比较,对各种模型理论面波波形与实际观测噪声面波格林函数的拟合程度进行评价,进而定性分析各个地壳速度结构可靠性。结合福建省地震台网的噪声数据,研究利用噪声记录提取面波格林函数,根据面波波形对地下分层速度结构比较敏感的特点,通过对福建地区不同地壳速度模型计算的理论面波(瑞利波和勒夫波)波形进行比较分析。总结各种模型的优缺点,得到哪些模型在福建地区比较适用。 展开更多
关键词 噪声观测数据 格林函数 地壳速度模型 瑞利波和勒夫波 地下分层速度结构
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基于异向波速模型的微震定位改进 被引量:15
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作者 戴峰 郭亮 +3 位作者 徐奴文 樊义林 徐剑 姜鹏 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2016年第9期3291-3301,共11页
针对波速分层的区域岩体,在异向波速模型的基础上,对垂向上的应力波按岩体波速值大小作分段区别,推导震源应力波走时关系式,建立分层速度定位目标函数,基于此提出一种由参数准备、层速度反演、微震定位三个模块组成的分层速度定位模型SV... 针对波速分层的区域岩体,在异向波速模型的基础上,对垂向上的应力波按岩体波速值大小作分段区别,推导震源应力波走时关系式,建立分层速度定位目标函数,基于此提出一种由参数准备、层速度反演、微震定位三个模块组成的分层速度定位模型SV,并采用遗传算法进行优化求解.然后,对分层速度定位模型在已构建微震监测系统的白鹤滩水电站左岸岩质边坡进行验证.微震事件重定位结果表明,分层速度定位模型定位微震事件的最大、最小和平均偏离层内错动带程度指标较单一速度模型分别降低了57.17%、36.51%和57.35%,证明了定位模型在波速分层的区域岩体微震定位应用中比单一速度定位模型更加合理可靠. 展开更多
关键词 微震监测 异向波速模型 分层速度定位模型 遗传算法 岩质边坡
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基于轮轨黏着大滑移机理的防滑黏着利用控制策略研究
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作者 张波 周军 +2 位作者 蔡田 常崇义 齐政亮 《铁道学报》 EI CAS CSCD 北大核心 2024年第5期30-37,共8页
随着列车运行速度的提高,轮轨界面湿滑条件下存在制动黏着利用需求与黏着系数下降的矛盾,因此急需突破制动防滑及黏着利用关键技术瓶颈。在深入分析高速制动黏着-滑移特性规律以及黏着再上升影响因素的基础上,提出一种基于分层滑动速度... 随着列车运行速度的提高,轮轨界面湿滑条件下存在制动黏着利用需求与黏着系数下降的矛盾,因此急需突破制动防滑及黏着利用关键技术瓶颈。在深入分析高速制动黏着-滑移特性规律以及黏着再上升影响因素的基础上,提出一种基于分层滑动速度判据的黏着大滑移机理的防滑黏着利用控制策略。该策略通过维持一定的滑动速度获得滑动能量进而改善轮轨黏着系数,并根据测量的轮轨接触点切向力和防滑阀下游的制动缸压力实时计算滑行过程的轮轨可用黏着系数判断轮轨黏着改善程度。在此基础上,进行基于1∶1高速轮轨关系试验台的不同黏着条件下的高速防滑模拟试验,结果表明:该控制策略可自适应地追踪不同轮轨黏着条件下(水、防冻液)的可用黏着,提高了防滑控制系统对铁路复杂运用环境和轮轨黏着特性的适应性。 展开更多
关键词 黏着利用 大滑移 分层滑动速度 滑动能量 可用黏着系数
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陶粒轻骨料与普通混凝土的黏结剪切性能 被引量:6
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作者 王建民 李鹏飞 +2 位作者 冯楚祥 肖自强 柳俊哲 《建筑材料学报》 EI CAS CSCD 北大核心 2022年第7期700-707,共8页
设计制作了双面直剪型陶粒轻骨料混凝土与普通混凝土叠合浇筑试块并进行剪切破坏试验,发现各组试块的最终剪切破坏面层不同程度地由两侧混凝土及初始浇筑面层共同组成.为此,给出了具有内部分层式速度间断面的剪切破坏机构模型,并选用Mi... 设计制作了双面直剪型陶粒轻骨料混凝土与普通混凝土叠合浇筑试块并进行剪切破坏试验,发现各组试块的最终剪切破坏面层不同程度地由两侧混凝土及初始浇筑面层共同组成.为此,给出了具有内部分层式速度间断面的剪切破坏机构模型,并选用Mises屈服条件及Coulomb剪破条件,根据塑性极限分析原理建立了2种混凝土黏结层剪切破坏强度的解析解.结果表明:陶粒轻骨料混凝土与普通混凝土叠合浇筑时,考虑浇筑结合面处理方式、浇筑间隔时间及法向力影响的最终剪切破坏遵循Mohr-Coulomb强度准则. 展开更多
关键词 混凝土粘结 剪切性能 塑性极限分析 分层速度间断 陶粒轻骨料
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巨厚松散层煤田三维地震勘探时深转换方法探讨 被引量:9
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作者 孙希杰 《中国矿业》 北大核心 2018年第B06期412-414,共3页
时深转换是煤田三维地震资料解释中最关键的一个环节,目前常用的时深转换方法是平均速度时深转换法,这一方法在松散层较厚的区域应用易造成煤层底板深度及断层落差误差较大,无法满足勘探精度要求。本文针对勘探区实际情况,对比了平均速... 时深转换是煤田三维地震资料解释中最关键的一个环节,目前常用的时深转换方法是平均速度时深转换法,这一方法在松散层较厚的区域应用易造成煤层底板深度及断层落差误差较大,无法满足勘探精度要求。本文针对勘探区实际情况,对比了平均速度与分层速度时深转换两种方法,经钻孔验证发现分层速度时深转换得到的煤层底板深度准确度较高。 展开更多
关键词 巨厚松散层 煤田 三维地震 平均速度 分层速度 时深转换
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方正“双复杂区”地震资料处理技术与应用 被引量:2
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作者 贾相国 康振军 +2 位作者 王世清 张永军 兰金涛 《大庆石油地质与开发》 CAS CSCD 北大核心 2019年第6期116-124,共9页
针对方正工区"双复杂区"地震资料存在严重的静校正,近地表、地下绕射源发育造成干扰波严重,地震资料信噪比低以及复杂构造成像难等难题,在精细处理方法上开展了研究应用工作,形成了以微测井折射分层速度控制下的层析静校正、&... 针对方正工区"双复杂区"地震资料存在严重的静校正,近地表、地下绕射源发育造成干扰波严重,地震资料信噪比低以及复杂构造成像难等难题,在精细处理方法上开展了研究应用工作,形成了以微测井折射分层速度控制下的层析静校正、"六分法"叠前去噪、叠后F-K域倾角滤波、叠前深度偏移深度域速度百分比精细扫描速度建模及优化、时间域反动校正速度分析、叠前深度偏移时间域精确成像等为特色的处理技术,解决了本区存在的静校正问题,提高了地震资料的信噪比,解决了因速度模型平滑造成的复杂构造不能准确成像问题,与本区以往处理的成果剖面相比,无论是信噪比、还是成像精度都有明显提高,在方正工区见到了明显的处理效果。 展开更多
关键词 微测井折射分层速度 “六分法”叠前去噪 速度建模及优化 叠前深度偏移 时间域反动校正速度分析
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黄土厚度变化较大地区煤田三维地震勘探时深转换方法的探讨 被引量:1
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作者 郑启孝 《中国煤炭地质》 2009年第8期56-60,共5页
时深转换是煤田三维地震资料解释中非常关键的一步,时深转换方法的选取直接关系到地质成果的准确程度。针对山西某勘探区黄土覆盖厚度大且变化剧烈的实际情况,在比较大平均速度和分层速度两种时深转换方法的适应性和误差特点的基础上,... 时深转换是煤田三维地震资料解释中非常关键的一步,时深转换方法的选取直接关系到地质成果的准确程度。针对山西某勘探区黄土覆盖厚度大且变化剧烈的实际情况,在比较大平均速度和分层速度两种时深转换方法的适应性和误差特点的基础上,优选分层速度计算方法作为本区时深转换方法。具体步骤为:根据地层沉积相和地质构造特点,结合由速度谱数据库和声波测井速度数据库确定的岩性分布规律,以单斜为基本单元进行区块划分;计算出各区块的新生界、煤系地层的厚度和速度后,从而求出较为准确的煤层埋深。实例表明,采用分区块、分层计算的煤层底板深度不仅准确程度高,而且还能克服由大平均速度时深转换方法造成的煤层假构造现象。 展开更多
关键词 厚黄土 时深转换 平均速度 分层速度 单斜区块 三维地震
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微动勘探方法在武汉轨道交通岩溶勘察中的应用 被引量:6
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作者 刘博 徐富文 王鹏 《科学技术创新》 2021年第31期140-142,共3页
微动勘探方法是一种基于天然源的面波勘探方法,该方法受地形条件干扰小、无破坏性,是一种绿色勘探方法,适合在强电磁干扰的城区开展,在城市轨道交通岩溶探测中得到了广泛应用。以武汉地铁5号线岩溶勘察为例,通过小台阵采集微动数据,运用... 微动勘探方法是一种基于天然源的面波勘探方法,该方法受地形条件干扰小、无破坏性,是一种绿色勘探方法,适合在强电磁干扰的城区开展,在城市轨道交通岩溶探测中得到了广泛应用。以武汉地铁5号线岩溶勘察为例,通过小台阵采集微动数据,运用SPAC法提取频散曲线并反演地下地质体视S波速度,开展单点频散曲线反演分层,多个单点反演成果形成视S波速度断面,成果分析认为,微动勘探十分适合于城区狭窄、强电磁干扰地区地下岩溶探测,地层速度分层,在城市轨道交通探测中可优先选择。 展开更多
关键词 微动勘探 空间自相关法 岩溶探测 速度分层
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鄂西—渝东地区地震深度构造图成图方法研究
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作者 邹军成 伍宁南 《资源环境与工程》 2007年第5期593-596,共4页
分析了鄂西—渝东地区地震勘探中目前利用偏移剖面转换深度剖面,然后用深度剖面直接编制构造图的方法,指出其存在工作量大,在高陡构造陡带部位效果差,与钻井误差较大的缺点,以及速度谱资料变速成图方法不适合本工区的原因,提出利用分层... 分析了鄂西—渝东地区地震勘探中目前利用偏移剖面转换深度剖面,然后用深度剖面直接编制构造图的方法,指出其存在工作量大,在高陡构造陡带部位效果差,与钻井误差较大的缺点,以及速度谱资料变速成图方法不适合本工区的原因,提出利用分层平均速度曲线进行分区成图的方法。理论分析和应用实例表明:该方法具有效率高、成图误差小的优点。 展开更多
关键词 鄂西—渝东 构造图 深度剖面成图 速度谱资料变速成图 分层平均速度 分区成图
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The properties of dilute debris flow and hyper-concentrated flow in different flow regimes in open channels 被引量:1
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作者 LIU Yan WANG Hui-feng +2 位作者 CHEN Hua-yong HU Kai-heng WANG Xie-kang 《Journal of Mountain Science》 SCIE CSCD 2017年第9期1728-1738,共11页
Particle Image Velocimetry(PIV) technique was used to test the analogues of hyperconcentrated flow and dilute debris flow in an open flume. Flow fields, velocity profiles and turbulent parameters were obtained under d... Particle Image Velocimetry(PIV) technique was used to test the analogues of hyperconcentrated flow and dilute debris flow in an open flume. Flow fields, velocity profiles and turbulent parameters were obtained under different conditions. Results show that the flow regime depends on coarse grain concentration. Slurry with high fine grain concentration but lacking of coarse grains behaves as a laminar flow. Dilute debris flows containing coarse grains are generally turbulent flows. Streamlines are parallel and velocity values are large in laminar flows. However, in turbulent flows the velocity diminishes in line with the intense mixing of liquid and eddies occurring. The velocity profiles of laminar flow accord with the parabolic distribution law. When the flow is in a transitional regime, velocity profiles deviate slightly from the parabolic law. Turbulent flow has an approximately uniform distribution of velocity and turbulent kinetic energy. The ratio of turbulent kinetic energy to the kinetic energy of time-averaged flow is the internal cause determining the flow regime: laminar flow(k/K<0.1); transitional flow(0.1< k/K<1); and turbulent flow(k/K>1). Turbulent kinetic energy firstly increases with increasing coarse grain concentration and then decreases owing to the suppression of turbulence by the high concentration of coarse grains. This variation is also influenced by coarse grain size and channel slope. The results contribute to the modeling of debris flow and hyperconcentrated flow. 展开更多
关键词 Hyper-concentrated flow Debris flow Flow regime Velocity profile Turbulent kinetic energy Open channel
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微动在郴州某地勘查的应用
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作者 刘俊峰 周安 +1 位作者 朱小燕 王荡 《中国金属通报》 2018年第10期174-175,共2页
微动方法是近年来兴起的一种新方法,目前在工程勘查领域得到越来越多的应用,本文利用微动进行了勘查,勘查结果展示了岩石速度分层与钻探结果吻合较好,表明微动方法具有适用性。
关键词 微动 勘查 速度分层
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瑞利波法用于井下探测煤层顶板至冲积层的距离
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作者 毛志国 邵唯 《河北煤炭》 2000年第2期44-45,共2页
介绍了瑞利波探测技术,在井下煤层顶板至冲积层的距离的探测中所用的仪器、测点布置及资料解释,实践证明,该方法省时省力,效果甚好,值得推广。
关键词 瑞利波 速度分层曲线 煤层顶板 冲积层 距离
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Breakability analysis of the elastic rock beam based on the winkler model
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作者 孟祥瑞 高召宁 《Journal of Coal Science & Engineering(China)》 2007年第2期118-122,共5页
Based on the Winkler model, a mechanic model was established with formulas derived concerned with the deformations before and after a roof breakage at places in front of and at the back of the working face. In accorda... Based on the Winkler model, a mechanic model was established with formulas derived concerned with the deformations before and after a roof breakage at places in front of and at the back of the working face. In accordance with the theory for rock beam breakage, the beam breaking position in front of the working face is specified. In addition, the formulas were developed for the velocity of the subsidence at observatory point A in front of the working face when the coal wall serves as the coordinate center and the advance distance at time t as the dynamic coordinate. In the application of the above-mentioned achievements to the practice of Xieqiao Mine and the mines of the Eastern Panji Company of Huainan Mining(Group) Co. Ltd., the results concerned with the velocity with which the roof stratum tends to subside before and after breakage as derived from the mechanic model are well compatible to the results based on in-situ observations and measurements. 展开更多
关键词 ELASTIC rock beam breaking place SUBSIDENCE
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Experimental investigation of Reynolds stress complex eddy viscosity model for coherent structure dynamics 被引量:9
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作者 JIA YongXia TANG ZhanQi JIANG Nan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第7期1319-1327,共9页
Time sequence signals of streamwise and normal velocity components,as well as velocity strain rate,at different vertical locations in the turbulent boundary layer over a smooth flat plate in a wind tunnel have been fi... Time sequence signals of streamwise and normal velocity components,as well as velocity strain rate,at different vertical locations in the turbulent boundary layer over a smooth flat plate in a wind tunnel have been finely examined by the use of double-sensor hot-wire anemometry.The local module maximum for wavelet coefficient of longitudinal velocity component,as a detecting index,is employed to educe the ejection and sweep process of the coherent structure burst in the turbulent boundary layer from the random fluctuating background.The coherent waveforms of Reynolds stress residual contribution term for random fluctuations to coherent structure,as well as the velocity strain rate of coherent structure,are extracted by the conditional phase average technique.Based on the theoretical analysis of eddy viscosity coefficient in complex eddy viscosity model for coherent structure,the macro-relaxation effect between Reynolds stress residual contribution term of random fluctuations to coherent structure and the velocity strain rate of coherent structure is studied and the variations of the phase difference between them across the turbulent boundary layer are investigated experimentally.The rationality of complex eddy viscosity model for coherent structure is confirmed through the investigation. 展开更多
关键词 turbulent boundary layer coherent structure complex eddy viscosity model Reynolds stress phase difference
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Rayleigh wave phase velocities of South China block and its adjacent areas 被引量:7
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作者 L Jian XIE ZuJun +3 位作者 ZHENG Yong ZHA XiaoHui HU Rui ZENG XinFu 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第11期2165-2178,共14页
Using records of continuous seismic waveforms from 609 broadband seismic stations in the South China Block and its adjacent areas in 2010–2012, empirical Green's functions of surface waves were obtained from cros... Using records of continuous seismic waveforms from 609 broadband seismic stations in the South China Block and its adjacent areas in 2010–2012, empirical Green's functions of surface waves were obtained from cross-correlation functions of ambient noise data between these stations. High quality phase velocity dispersion curves of Rayleigh waves were obtained using time-frequency analysis. These interstation dispersion curves were then inverted to build Rayleigh wave phase velocity maps at periods of 6–50 s. The results of phase velocity maps indicate that phase velocities at 6–10 s periods are correlated with the geological features in the upper crust. Major basins and small-scale grabens and basins display slow velocity anomalies; while most of the orogenic belts and the fold belts display high velocity anomalies. With the gravity gradient zone along Taihang Mountain to Wuling Mountain as the boundary for the phase velocity maps at period of 20–30 s, the western area mainly displays low velocity anomalies, while the eastern side shows high velocity anomalies. Phase velocities in the eastern South China Block south to the Qinling-Dabie orogenic belt is higher than that in the eastern North China Block to the north, which is possibly due to the differences of tectonic mechanisms between the North China Craton and the South China Block. The phase velocities at periods of40–50 s are possibly related to the lateral variations of the velocity structure in the lower crust and upper mantle: The low-velocity anomalies in the eastern part of the Tibetan Plateau are caused by the thick crust; while the Sichuan Basin and the southern part of the Ordos Basin display distinct high-velocity anomalies, reflecting the stable features of the lithosphere in these blocks. The lateral variation pattern of phase velocities in the southern part of the South China Block is not consistent with the surface trace of the block boundary in the eastern Yunnan Province and its vicinities. The phase velocities in the Sichuan Basin are overall slow at short periods and gradually increase with period from the central part to the edge of the basin, indicating the features of shallower basement in the center and overall stable lithospheric mantle of the basin. The middle and upper crust of the southern Ordos Basin in the North China Block is heterogeneous, while in lower crust and the uppermost mantle the phase velocities mainly exhibit high anomalies. High-velocity anomalies are widespread at the middle of the Qinling-Dabie orogenic belt, as well as the areas in southeastern Guangxi with Caledonian granite explosion, but its detailed mechanism is still unclear. 展开更多
关键词 South China block Ambient noise Phase velocity tomography Crust and upper mantle
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Unsteady Inflow Effects on the Wake Shed from a High-Lift LPT Blade Subjected to Boundary Layer Laminar Separation 被引量:1
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作者 Francesca Satta Marina Ubaldi Pietro Zunino 《Journal of Thermal Science》 SCIE EI CAS CSCD 2012年第2期97-108,共12页
An experimental investigation on the near and far wake of a cascade of high-lift low-pressure turbine blades subjected to boundary layer separation over the suction side surface has been carried out, under steady and ... An experimental investigation on the near and far wake of a cascade of high-lift low-pressure turbine blades subjected to boundary layer separation over the suction side surface has been carried out, under steady and unsteady inflows. Two Reynolds number conditions, representative of take-off/landing and cruise operating conditions of the real engine, have been tested. The effect of upstream wake-boundary layer interaction on the wake shed from the profile has been investigated in a three-blade large-scale linear turbine cascade. The comparison between the wakes shed under steady and unsteady inflows has been performed through the analysis of mean velocity and Reynolds stress components measured at midspan of the central blade by means of a two-component crossed miniature hot-wire probe. The wake development has been analyzed in the region between 2% and 100% of the blade chord from the central blade trailing edge, aligned with the blade exit direction. Wake integral parameters, half-width and maximum velocity defects have been evaluated from the mean velocity distributions to quantify the modifications induced on the vane wake by the upstream wake. Moreover the thicknesses of the two wake shear layers have been considered separately in order to identify the effects of Reynolds number and incoming flow on the wake shape. The self-preserving state of the wake has been looked at, taking into account the different thicknesses of the two shear layers. The evaluation of the power density spectra of the velocity fluctuations allowed the study of the wake unsteady behavior, and the detection of the effects induced by the different operating conditions on the trailing edge vortex shedding. 展开更多
关键词 Wake-wake unsteady interaction high-lift blade profiles low-pressure turbine blade wake.
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Scattering Characteristics of Liquid Droplets Spun Off from Rotating Disk Edge
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作者 Mizue MUNEKATA Akira NOGUCHI +2 位作者 Jun NISHIYAMA Hiroaki KURISHIMA Hiroyuki YOSHIKAWA 《Journal of Thermal Science》 SCIE EI CAS CSCD 2012年第1期42-48,共7页
Scattering characteristics of liquid droplets spun off from a rotating disk edge are experimentally investigated. In the present research, aluminum disks are utilized and ethanol is employed for liquid. Scattering phe... Scattering characteristics of liquid droplets spun off from a rotating disk edge are experimentally investigated. In the present research, aluminum disks are utilized and ethanol is employed for liquid. Scattering phenomena of the droplets are captured by the high-speed digital camera. Frequency distribution of the droplet diameter is evaluated from these images and distributions of horizontal flying velocity and angle of the droplets were measured by PTV. Liquid filaments are stretched outward from the stagnant liquid layer by centrifugal force and skew complicatedly by aerodynamic force. Some peaks appear in the distribution of the scattered droplet diameter and they are origi- nated from large terminal droplets and small droplets generated from filamentwise breakup. Most of the scattered droplets fly slightly inside in the tangential direction of the disk edge. The droplets spun off from the thin disk scatter widely compared with that from the thick one. 展开更多
关键词 Rotating disk Scattering droplet VISUALIZATION Particle tracking velocimetry
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Analytic prediction for planar turbulent boundary layers
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作者 Xi Chen Zhen-Su She 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第11期51-57,共7页
Analytic predictions of mean velocity profile(MVP) and streamwise(x) development of related integral quantities are presented for flows in channel and turbulent boundary layer(TBL), based on a symmetry analysis of edd... Analytic predictions of mean velocity profile(MVP) and streamwise(x) development of related integral quantities are presented for flows in channel and turbulent boundary layer(TBL), based on a symmetry analysis of eddy length and total stress. Specific predictions include the relations for momentum Reynolds number(Reθ) with friction Reτ and streamwise Re_x: Re_θ≈ 3.27Re_τ,and Re_x/Re_θ = 4.94(lnRe_θ + 1.88)~2 + 1; the streamwise development of the friction velocity u_τ: U_e/u_τ≈ 2.22 lnRe_x + 2.86. 3.83ln(lnRe_x), and of the boundary layer thickness δ_e: x/δ_e ≈ 7.27 lnRe_x.5.18.12.52ln(lnRe_x), which are fully validated by recent reliable data. 展开更多
关键词 turbulent boundary layer symmetry analysis eddy length log law
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