中文摘要：

以超高负荷两级风扇第一级前掠转子为研究对象,通过定常和非定常数值模拟手段对近失速点叶尖流场进行了深入分析。为探索失稳机理,与同等气动性能下的后掠转子进行了对比。结果表明：前掠转子在近失速工况下泄漏涡涡心并未发生破碎,其流动失稳是由于端壁机匣处的低能流体集聚所致。而后掠转子的泄漏涡与激波干涉导致其向下游发展中发生破碎,表现出与常规转子相似的失速特征。

英文摘要：

Steady and unsteady three-dimensional viscous flows are calculated to obtain flow fields under various operat- ing conditions for two-level highly loaded transonic forward-speep rotors and to advance the understanding of the flow field near tip regions. The study shows that with the forward-swept rotor, the tip clearance vortex does not break down even under the stalled condition. A low momentum area originating from the endwall boundary layer prevents incoming flow from passing through the pressure side of the passage and initiates stall inception. With the backsweep rotor, the core tip clearance vortex breaks down just like when a conventional rotor does near the stalled condition.