| 交变流动中压力速度之间相位差对突变截面损失的影响分析 |
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| 引用本文： | 张宇坤,陈燕燕,戴巍,罗二仓. 交变流动中压力速度之间相位差对突变截面损失的影响分析[J]. 低温与超导, 2010, 38(7) |
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| 作者姓名： | 张宇坤 陈燕燕 戴巍 罗二仓 |
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| 作者单位： | 中国科学院理化技术研究所低温工程学重点实验室,北京,100190;中国科学院研究生院,北京,100049;中国科学院理化技术研究所低温工程学重点实验室,北京,100190;中国科学院力学所国家微重力实验室,北京,100190;中国科学院理化技术研究所低温工程学重点实验室,北京,100190 |
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| 摘 要： | 从弱非线性热声理论出发,给出交变流动中突变截面阻力系数的定义以及考察方法。通过PIV(粒子成像测速仪)测量与CFD计算结果的对比,验证了CFD计算结果的可靠性。进而利用CFD模拟考察了交变流动中压力与速度之间相位差对突变截面局部损失的影响,观察到产生这种影响的流场内部流动机制。分析表明,阻力特性确实对声场压力与速度之间的相位差存在依赖性,但这种依赖性会随着非线性的增强而减少。
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| 关 键 词： | 热声热机 突变截面 交变流动 局部损失 CFD模拟 PIV |
Investigation on the influence of the phase difference between pressure and velocity on the minor losses for a duct with sudden area change |
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| Zhang Yukun,Chen Yanyan,Dai Wei,Luo Ercang. Investigation on the influence of the phase difference between pressure and velocity on the minor losses for a duct with sudden area change[J]. Cryogenics and Superconductivity, 2010, 38(7) |
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| Authors: | Zhang Yukun Chen Yanyan Dai Wei Luo Ercang |
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| Affiliation: | Zhang Yukun1,2,Chen Yanyan1,3,Dai Wei1,Luo Ercang1 (1.Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry of CAS,Beijing 100190,China,2.Graduate University of the Chinese Academy of Sciences,Beijing 100049,3.State Key Laboratory of Microgravity Research,Institute of Mechanics of CAS,China) |
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| Abstract: | Minor losses for oscillating flow in a duct with sudden area change have been investigated through non-linear theoretical analysis,PIV measurement and CFD simulation.The influence of phase difference between pressure and velocity on the minor losses has been analyzed.The results show that the resistance characteristic has a dependence on the phase difference between pressure and velocity.However,this dependence is weakened as the non-linearity strengthens.The CFD simulation is useful for the flow characteri... |
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| Keywords: | PIV |
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