轴流压气机串列叶片损失模型发展

Development of Loss Model for Tandem Blades in Axial-Flow Compressors

考虑到串列叶片具有比常规叶片更多的设计自由度,于是为建立一个包含主要设计参数的串列叶片性能评估模型,本文发展了一套串列叶片损失低维评估方法。首先利用数值模拟方法确定了串列叶片的主要损失来源,并定量分析了不同损失来源占总损失的比重,发现前叶尾迹损失不可忽略。在此基础上,建立了计及前叶尾迹损失的串列叶片损失模型并与数值结果进行了校核。结果表明,前叶尾迹损失是型面损失的重要部分并且损失模型能够较好地预测串列叶片不同损失来源。因此,发展的模型可以作为串列叶片性能评估以及参数化设计的重要工具。

This paper develops a low-dimensional loss evaluation method for tandem blades including dominant design parameters for the sake of more design freedoms of tandem blades to be determined compared to conventional blades.Numerical simulations are firstly employed to investigate main loss sources of tandem blades,and respective percentages of overall loss.The results indicate the mixing of forward blade wake in the passage of aft blades can not be ignored.Based on the conclusion,a theoretical loss evaluation model involving forward blade wake is developed and compared to the result of numerical simulations.It is revealed that forward blade wake plays a significant role in the loss model.The loss model is able to predict all loss sources in a good agreement.Therefore,the developed loss model is expected to be used as an available tool for preliminary loss evaluation and parametric design of tandem blades.