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多元线性回归模型对于空气质量的校准应用研究 被引量:2
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作者 范天星 刘亚曦 《科学技术创新》 2022年第2期57-60,共4页
自改革开放以来,随着国家经济的快速发展,生态环境遭到一定程度的破坏,空气质量问题也日益严重。本研究聚焦于国控点和自建点大气监测数据进行可视化探索性研究分析,首先以国控点数据为参照对象,以自然因素为变量进行对比分析,研究自然... 自改革开放以来,随着国家经济的快速发展,生态环境遭到一定程度的破坏,空气质量问题也日益严重。本研究聚焦于国控点和自建点大气监测数据进行可视化探索性研究分析,首先以国控点数据为参照对象,以自然因素为变量进行对比分析,研究自然因素对自建点数据的影响。然后分别采用一元线性回归和多元线性回归两种方法对现有的空气质量检测仪存在的问题进行分析,确定各自然因素与空气质量数据的影响程度。最后通过一元和多元线性回归模型模拟分析,校准自建点数据。 展开更多
关键词 一元线性回归模型 多元线性回归模型 大气颗粒物 空气质量
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Characteristics and mechanism investigation on drag reduction of oblique riblets 被引量:4
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作者 GU Yun-qing FAN Tian-xing +2 位作者 MOU Jie-gang WU Deng-hao ZHENG Shui-hua 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第6期1379-1386,共8页
This work primarily focuses on the drag reduction characteristics and mechanism investigation of oblique riblets. First, a calculation model of the oblique riblets surface is established, and Reynolds stress model(RSM... This work primarily focuses on the drag reduction characteristics and mechanism investigation of oblique riblets. First, a calculation model of the oblique riblets surface is established, and Reynolds stress model(RSM) turbulence model is used for numerical simulation of the oblique riblets flow field. Subsequently, the influence of inclination angle between flow direction and arrangement direction of riblets on friction resistance and drag reduction rate is further analyzed. Through the investigation of the distribution of shear stress, pressure stress and velocity in oblique riblets boundary layer, the oblique riblets drag reduction mechanism is finally revealed. Results show that, with increase of velocity and inclination angle, the pressure resistance increases obviously, along with the decreasing of the viscous resistance distinctly. The maximum drag reduction rate of the oblique riblets is 7.33%. Moreover, when the inclination angle increases, the wall shear stress reduces on oblique riblets surface; while differential pressure increases at both sides of oblique riblets tips. In addition, when inclination angle is small, the secondary vortex at oblique riblets tips will disappear soon. New vortices will be formed inside the oblique riblets and cause the decrease of viscosity resistance. Thus, oblique riblets show a better drag reduction effect and have an effective control on boundary layer. 展开更多
关键词 OBLIQUE RIBLETS drag reduction REYNOLDS stress model (RSM) SECONDARY VORTEX numerical simulation
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Effect of bionic mantis shrimp groove volute on vortex pump pressure pulsation 被引量:4
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作者 GU Yun-qing ZHANG Wen-qi +3 位作者 MOU Jie-gang ZHENG Shui-hua ZHOU Pei-jian FAN Tian-xing 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第10期2399-2409,共11页
In order to reduce pressure pulsation of vortex pumps,the mantis shrimp was chosen as biological prototype and a bionic engineering model was developed from its abdominal segment grooves.Bionic mantis shrimp groove vo... In order to reduce pressure pulsation of vortex pumps,the mantis shrimp was chosen as biological prototype and a bionic engineering model was developed from its abdominal segment grooves.Bionic mantis shrimp groove volute vortex pump models with different numbers of grooves were developed,and numerical simulation methods were used to calculate the models to study the effects of the volute grooves on the pressure pulsation of a vortex pump.The results show that a bionic groove volute could effectively improve the pressure pulsation of a vortex pump outlet,and reduce the pressure pulsation around the pump’s tongue and other internal points.The pressure pulsation under different conditions is impacted by shaft frequency and blade frequency.The bionic groove structure has little effect on the external characteristics of the pump,but could improve the static pressure,velocity distribution,and vortex structure of the flow field.Additionally,pressure pulsation of the whole vortex pump is reduced. 展开更多
关键词 vortex pump bionic mantis shrimp groove VOLUTE pressure pulsation flow characteristic
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