掠形对高负荷风扇转子失稳机理的影响  

Influence of Sweep on Tip Regions Flow Unstability in a Highly Loaded Fan Rotor

作　　者：王雷[1] 刘波[1] 

机构地区：[1]西北工业大学动力与能源学院,西安710072

出　　处：《机械科学与技术》2013年第2期217-220,共4页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(50976093);863计划项目(2008AA05Z202)资助

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。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.

关 键 词：掠形 稳定性 泄漏流 涡破碎 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]