Origins and structure of spike-type rotating stall
Origins and structure of spike-type rotating stall
复制标题
DOI：
10.1115/gt2012-68707
复制
发表时间：
2012-06
期刊：
影响因子：
8.8
通讯作者：
G. Pullan;A. Young;I. Day;E. Greitzer;Z. Spakovszky
中科院分区：
文献类型：
--
作者：
G. Pullan;A. Young;I. Day;E. Greitzer;Z. Spakovszky
在本文中，我们描述的结构，产生一个穗型路线旋转失速，并解释其形成的物理机制。的描述和解释是基于数值模拟，补充和实验证实。据发现，尖峰是由于在转子尖部区域的压力上升能力的损失，由于流动分离所造成的高发病率。这种分离导致前缘涡量脱落，从而在吸力面和机匣之间形成旋涡。如转子参考系中所示，在机匣附近，涡流朝向相邻叶片的压力面对流。涡流接近相邻叶片时，会在该叶片上触发分离，因此结构会扩展。上述一系列事件构成了一个峰值。模拟结果表明，在叶尖间隙范围内（包括零间隙），都会产生脱落涡。这意味着它们不是叶尖间隙涡的一部分，这与最近的实验结果雅阁。证据表明，这些涡结构的存在之前，穗型失速，更强烈的是，他们的因果关系与穗型失速开始。来自几个压气机的数据再现了模拟中看到的尖峰型失速开始的压力和速度特征。
In this paper we describe the structures that produce a spike-type route to rotating stall and explain the physical mechanism for their formation. The descriptions and explanations are based on numerical simulations, complemented and corroborated by experiments. It is found that spikes are caused by a loss of pressure rise capability in the rotor tip region, due to flow separation resulting from high incidence. The separation gives rise to shedding of vorticity from the leading edge and the consequent formation of vortices that span between the suction surface and the casing. As seen in the rotor frame of reference, near the casing the vortex convects toward the pressure surface of the adjacent blade. The approach of the vortex to the adjacent blade triggers a separation on that blade so the structure propagates. The above sequence of events constitutes a spike. The simulations show shed vortices over a range of tip clearances including zero. The implication is that they are not part of the tip clearance vortex, in accord with recent experimental findings. Evidence is presented for the existence of these vortex structures immediately prior to spike-type stall and, more strongly, for their causal connection with spike-type stall inception. Data from several compressors are shown to reproduce the pressure and velocity signature of the spike-type stall inception seen in the simulations.Copyright © 2012 by ASME