叶根间隙泄漏流对跨声压气机转子性能的影响

Numerical investigation of the effect of hub leakage flow on transonic compressor rotor

关键词:  跨音速压气机  转子  叶根  流场仿真  性能分析

Key words:  Transonic compressor  Rotor  Blade root  Flow field simulation  Performance analysis

摘要:

为研究压气机转子上游叶根轴向间隙泄漏流对转子性能的影响程度以及泄漏流与转子流场之间的相互作用机制,对带有叶根泄漏流的跨声压气机转子流场进行了数值模拟。计算时分别采用了两种模化途径,即耦合求解转子上游叶根间隙内空腔与转子通道内的流场,以及求解将叶根间隙模化为进口边界的转子流场。结果表明:叶根泄漏流可使叶根附近流动堵塞增大,造成转子气动性能的恶化。另外,叶根泄漏流的周向速度分量越大,泄漏流对转子流场的不利影响也越大。

Abstract:

The effect of leakage flow due to the upstream hub axial gap on the rotor performance and the mechanism of interaction between the hub leakage flow and the rotor blade passage flow were studied based on the numerical simulations of the flow fields of a transonic compressor rotor with upstream hub leakage. The hub leakage flows were modeled and calculated in two different ways: the flow fields inside hub axial gap were calculated together with blade passage flow in an integrated manner, and the leakage flows due to the hub axial gap were modeled as inlet boundary conditions. It is found that the hub leakage flow leads to an increased flow blockage near the hub, resulting in drop of rotor performance. Additionally, the larger the circumferential velocity component of hub leakage flow, the greater the deleterious effect of hub leakage upon the rotor flow.