流体机械

2010, v.38;No.458(08) 45-49

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不同紊流模型对预测单级轴流压气机性能曲线的影响
Investigation on the Performance Prediction of Single-Stage Axial Compressor by Using Different Turbulence Models

王仪田;张朝磊;许靖;王冬;黄淑娟;
WANG Yi-tian1,2,ZHANG Zhao-lei1,XU Jing2,WANG Dong2,HUANG Shu-jian1 (1.School of Power and Energy Engineering of Xi'an Jiaotong University,Xi'an 710049,China;2.Shanxi Blower(group) Co.,Ltd.,Xi'an 710075,China)

摘要(Abstract):

对某工业用单级轴流压气机,采用6种不同紊流模型进行了定常流动数值分析,并与试验结果进行了对比。结果表明,采用各种紊流模型预测的级特性曲线与试验曲线在设计工况附近预测结果与试验值基本吻合;而在非设计点特别是接近失速和阻塞点,预测结果与试验偏差较大。在分析了压头系数、效率、压比和温升的偏差后,可见造成上述结果的原因是紊流模型低估了流动粘性损失,尤其在靠近失速与堵塞点。在计算采用的6种紊流模型中,综合考虑预测特性参数的精度、预测工况范围和计算用CPU时间等因素,两方程k-ω紊流模型具有优势,Spalart-Allmaras模型精度低但省时。
The Numerical Simulations of the steady flow were performed by using Spalart-Allmaras,k-ε,k-ω,BSL,SST and ω turbulence models in the single-stage axial compressor at different flow rates.The predicted overall performances were compared to the reliable experimental data.The results show that relatively accurate predictions can be obtained at,or close to,the design point,but the reliability of the predictions was questionable at off-design conditions,especially near the stall point and chock point.Therefore,an investigation was achieved to find out the cause of the deviations by analyzing the pressure coefficient,polytropic effecinecy,pressure ratio as well as difference in temperature.The reason was that the viscous losses of the flow were underestimated in the turbulence models,especially near the stall point and chock point.In the six turbulence models,the k-ω model has more accuracy with large predictable operation range and less CPU time,and Spalart-Allmaras model saves CPU time but less accurate.

关键词(KeyWords): 紊流模型;数值分析;轴流压气机;特性预测
turbulence model;numerical simulation;axial compressor;performance prediction

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作者(Author): 王仪田;张朝磊;许靖;王冬;黄淑娟;
WANG Yi-tian1,2,ZHANG Zhao-lei1,XU Jing2,WANG Dong2,HUANG Shu-jian1 (1.School of Power and Energy Engineering of Xi'an Jiaotong University,Xi'an 710049,China;2.Shanxi Blower(group) Co.,Ltd.,Xi'an 710075,China)

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