轴流式叶轮机时序效应的机理探讨

Probe into the Mechanism of Clocking Effect in Turbomachinery

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。

A review of the research on clocking effect in turbomacinery in recent years is presented. As the experiments show that the benefit acquired by clocking effect in turbine is prominent, and the benefit increases with the flow velocity in compressor. The difference of efficiency induced by clocking effect results in the unsteady interaction. The introduction of clocking effect is meaningful that this phenomenon gives the way which leads us to use the unsteadiness of flow and urges people to consider function of the flow unsteadiness in the design of turbomachine. An engineering model to make use of clocking effect based on the present understanding of this phenomenon has been given.