• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.6 pt.A; 20050606-09; Reno-Tahoe,NV(US) >INFLUENCE OF ROTATING INSTABILITY ON STALL INCEPTION PATTERNS IN A VARIABLE-PITCH AXIAL-FLOW FAN
【24h】

INFLUENCE OF ROTATING INSTABILITY ON STALL INCEPTION PATTERNS IN A VARIABLE-PITCH AXIAL-FLOW FAN

机译：变螺距轴流风扇的旋转不稳定性对失速进气模式的影响

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An experimental study was conducted to investigate the inception patterns of rotating stall at different rotor blade stagger-angle settings with the aim of extending the stable operating range for a variable-pitch axial-flow fan. Pressure and velocity fluctuations were measured for a low-speed axial-flow fan with a relatively large tip clearance. Two stagger-angle settings were tested, the design setting, and a high setting which was 10 degrees greater than the design setting. Rotating instability (RI) was first observed near the peak pressure-rise point at both settings. It propagated in the rotation direction at about 40 to 50% of the rotor rotation speed, and its wavelength was about one rotor-blade pitch. However, the stall-inception patterns differed between the two settings. At the design stagger-angle setting, leading edge separation occurred near the stall-inception point, and this separation induced a strong tip leakage vortex that moved upstream of the rotor. This leakage vortex simultaneously induced a spike and a RI. The conditions for stall inception were consistent with the simple model of the spike-type proposed by Camp and Day. At the high stagger-angle setting, leading edge separation did not occur, and the tip leakage vortex did not move upstream of the rotor. Therefore, a spike did not appear although RI developed at the maximum pressure-rise point. This RI induced a large end-wall blockage that extended into the entire blade passage downstream of the rotor. This large blockage rapidly increased the rotor blade loading and directly induced a long length-scale stall cell before a spike or modal disturbance appeared. The conditions for stall inception were not consistent with the simple models of the spike or modal-type. These findings indicate that the movement of the tip leakage vortex associated with the rotor blade loading affects the development of a spike and RI and that the inception pattern of a rotating stall depends on the stagger-angle setting of the rotor blades.
机译：为了扩大可变螺距轴流风机的稳定运行范围，进行了一项实验研究，以研究在不同转子叶片交错角度设置下旋转失速的开始模式。对于叶尖间隙较大的低速轴流风扇，测量了压力和速度波动。测试了两个交错角度设置，设计设置和比设计设置大10度的高设置。首先在两种设置的峰值压力上升点附近都观察到旋转不稳定性（RI）。它在旋转方向上以转子转速的40％至50％传播，其波长约为一个转子叶片螺距。但是，两个设置之间的失速开始模式不同。在设计交错角设置下，前缘分离发生在失速起始点附近，并且这种分离引起强烈的尖端泄漏涡流，该涡流向转子上游移动。该泄漏涡旋同时引起尖峰和RI。失速开始的条件与Camp和Day提出的尖峰类型的简单模型一致。在高交错角设置下，不会发生前缘分离，并且尖端泄漏涡旋不会在转子上游移动。因此，尽管RI在最大压力上升点出现，但未出现峰值。该RI引起较大的端壁堵塞，该堵塞扩展到转子下游的整个叶片通道中。这种大的堵塞迅速增加了转子叶片的负荷，并在出现尖峰或模态干扰之前直接诱发了一个长尺度的失速室。失速开始的条件与峰值或模态类型的简单模型不一致。这些发现表明，与转子叶片负载相关的尖端泄漏涡旋的运动会影响尖峰和RI的发展，并且旋转失速的起始模式取决于转子叶片的交错角设置。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号