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轴流叶轮机转子-静子气动干涉噪声的快速预测
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作者 李士明 谢军龙 《华中理工大学学报》 CSCD 北大核心 1995年第8期50-54,共5页
发展了一种快速预测轴流叶轮机转子叶片排与静子叶片排气动干涉噪声频谱的方法。此方法计人了流体的压缩性、粘性、三维性以及声波在机壳内表面的声反射等因素。分析表明,此方法能预测在机壳内声的截止特性、声的衰减、转-静叶片数的... 发展了一种快速预测轴流叶轮机转子叶片排与静子叶片排气动干涉噪声频谱的方法。此方法计人了流体的压缩性、粘性、三维性以及声波在机壳内表面的声反射等因素。分析表明,此方法能预测在机壳内声的截止特性、声的衰减、转-静叶片数的配合和转。静间距变化对发声的影响及声的方向性等一系列声的主要特征。预测结果能满意地与实验相符。 展开更多
关键词 气动噪声 轴流叶轮机 叶片 转子 静子
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轴流式叶轮机时序效应的机理探讨 被引量:26
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作者 侯安平 周盛 《航空动力学报》 EI CAS CSCD 北大核心 2003年第1期70-75,共6页
对近年来关于轴流式叶轮机时序效应的一系列研究工作进行了分析整理。国外的实验表明:在涡轮中比在压气机中所获性能收益更为显著;对于压气机,在高速情况下比在低速情况下所获性能收益更为显著。本文对这种现象作了解释,并指出,时序效... 对近年来关于轴流式叶轮机时序效应的一系列研究工作进行了分析整理。国外的实验表明:在涡轮中比在压气机中所获性能收益更为显著;对于压气机,在高速情况下比在低速情况下所获性能收益更为显著。本文对这种现象作了解释,并指出,时序效应产生的机理可以用非定常流动的相互干扰来解释,尤其重要的是,时序效应机理为我们利用非定常流动提供了一个切入点,促使人们在叶轮机气动设计体系中考虑流动的非定常性。另外在现有认识基础上,文中给出了一个利用时序效应的初步工程模型。 展开更多
关键词 航空推进系统 航天推进系统 时序效应 固有非定常 轴流叶轮
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轴流式叶轮机S_2流面半反命题不可压流动的局部线性化有限元法
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作者 吕文朝 《中国科学技术大学学报》 CAS CSCD 北大核心 2015年第5期409-415,共7页
为探索局部线性化的有限元法在轴流式叶轮机S2流面半反命题不可压气动流场中的应用,使用八节点曲四边形等参元,通过通常的变分有限元法,计算了轴流式叶轮机S2流面半反命题的气动流场,同样,使用局部线性化有限元法也计算了该流场.两种计... 为探索局部线性化的有限元法在轴流式叶轮机S2流面半反命题不可压气动流场中的应用,使用八节点曲四边形等参元,通过通常的变分有限元法,计算了轴流式叶轮机S2流面半反命题的气动流场,同样,使用局部线性化有限元法也计算了该流场.两种计算结果一致,并且和实验结果符合较好,但后者的计算时间明显减少,储存量有所增加,计算过程的收敛性是好的. 展开更多
关键词 局部线性化 变分有限元法 半反命题 S2 流面 轴流叶轮
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多级风扇三维粘性流场的数值模拟 被引量:1
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作者 刘前智 周新海 《航空学报》 EI CAS CSCD 北大核心 2001年第6期539-541,共3页
进行了多级跨音速风扇粘性流动的数值模拟研究。求解全三维 N-S方程 ,通过高分辨率格式提高跨音速流场计算的准确性 ,利用 LU-SGS隐式解法加快计算收敛速度。给出了一双级高负荷跨音速风扇设计和非设计工况下的详细计算结果 ,各工况下... 进行了多级跨音速风扇粘性流动的数值模拟研究。求解全三维 N-S方程 ,通过高分辨率格式提高跨音速流场计算的准确性 ,利用 LU-SGS隐式解法加快计算收敛速度。给出了一双级高负荷跨音速风扇设计和非设计工况下的详细计算结果 ,各工况下的计算与实验数据均吻合较好。 展开更多
关键词 三维粘性流动 N-S方程 高分辨率格式 隐式解法 数值分析 轴流叶轮机
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Performance Analysis of a Vertical Axis Tidal Turbine With Flexible Blades 被引量:1
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作者 Mohamed Taher Bouzaher Belhi Guerira Mohamed Hadid 《Journal of Marine Science and Application》 CSCD 2017年第1期73-80,共8页
In this study, a vertical axis tidal turbine with flexible blades is investigated. The focus is on analyzing the effect of flexible airfoils types and blade flexibility on turbine net output power. To this end, five d... In this study, a vertical axis tidal turbine with flexible blades is investigated. The focus is on analyzing the effect of flexible airfoils types and blade flexibility on turbine net output power. To this end, five different flexible airfoils (Symmetric and Non-symmetric) are employed. The results show that the use of a thick flexible symmetric airfoil can effectively increase output power compared to that achievable with a conventional rigid blade. Moreover, the use of highly flexible blades, as opposed to less flexible or rigid blades, is not recommended. 展开更多
关键词 flexible blades vertical axis tidal turbine energy harnessing efficiency flow control rigid blade performance analysis
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Heat Transfer and Performance Characteristics of Axial Cooling Fans with Downstream Guide Vanes 被引量:2
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作者 Alexandros Terzis Ioannis Stylianou +1 位作者 Anestis I. Kalfas Peter Ott 《Journal of Thermal Science》 SCIE EI CAS CSCD 2012年第2期162-171,共10页
This study examines experimentally the effect of stators on the performance and heat transfer characteristics of small axial cooling fans. A single fan impeller, followed by nine stator blades in the case of a complet... This study examines experimentally the effect of stators on the performance and heat transfer characteristics of small axial cooling fans. A single fan impeller, followed by nine stator blades in the case of a complete stage, was used for all the experimental configurations. Performance measurements were carried out in a constant speed stage performance test rig while the transient liquid crystal technique was used for the heat transfer measurements. Full surface heat transfer coefficient distributions were obtained by recording the temperature history of liquid crystals on a target plate. The experimental data indicated that the results are highly affected by the flow conditions at the fan outlet. Stators can be beneficial in terms of pressure drop and efficiency, and thus more economical operation, as well as, in the local heat transfer distribution at the wake of the stator blades if the fan is installed very close to the cooling object. However, as the separation distance increases, enhanced heat transfer rate in the order of 25% is observed in the case of the fan impeller. 展开更多
关键词 axial fans STATORS PERFORMANCE thermochromic liquid crystals transient heat transfer
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Numerical Simulation of Clocking Effect on Blade Unsteady Aerodynamic Force in Axial Turbine 被引量:3
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作者 LI Wei ZHU Xiao-cheng OUYANG Hua DU Zhao-hui 《Journal of Thermal Science》 SCIE EI CAS CSCD 2012年第5期474-482,共9页
To give an insight into the clocking effect and its influence on the wake transportation and its interaction, the unsteady three-dimensional flow through a 1.5-stage axial low pressure turbine is simulated numerically... To give an insight into the clocking effect and its influence on the wake transportation and its interaction, the unsteady three-dimensional flow through a 1.5-stage axial low pressure turbine is simulated numerically by using a density-correction based, Reynolds-Averaged Navier-Stokes equations commercial CFD code. The 2nd stator clocking is applied over ten equal tangential positions. The results show that the harmonic blade number ratio is an important factor affecting the clocking effect. The clocking effect has very small influence on the turbine efficiency in this investigation. The difference between the maximum and minimum efficiency is about 0.1%. The maximum efficiency can be achieved when the 1st stator wake enters the 2nd stator passage near blade suction surface and its adjacent wake passes through the 2nd stator passage close to blade pressure surface. The minimum efficiency appears if the 1st stator wake impinges upon the leading edge of the 2nd stator and its adjacent wake of the 1st stator passes through the mid-channel in the 2nd stator. The wake convective transportation and the blade circulation variation due to its impingement on the subsequent blade are the main mechanism affecting the pressure variation in blade surface. 展开更多
关键词 Axial Turbine Clocking Effect Numerical Simulation
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