School of Mechanical Engineering, Dalian University of Technology, No. 2 Linggong Road, Dalian 116024, China.
Shenyang Blower Works Group, No.16 Development Road, Shenyang 110869, China.
Sensors (Basel). 2019 Nov 16;19(22):4995. doi: 10.3390/s19224995.
Rotating stall limits the operating range and stability of the centrifugal compressor and has a significant impact on the lifetime of the impeller blade. This paper investigates the relationship between stall pressure wave and its induced non-synchronous blade vibration, which will be meaningful for stall resonance avoidance at the early design phase. A rotating disc under a time-space varying load condition is first modeled to understand the physics behind stall-induced vibration. Then, experimental work is conducted to verify the model and reveal the mechanism of stall cells evolution process within flow passage and how blade vibrates when suffering such aerodynamic load. The casing mounted pressure sensors are used to capture the low-frequency pressure wave. Strain gauges and tip timing sensors are utilized to monitor the blade vibration. Based on circumferentially distributed pressure sensors and stall parameters identification method, a five stall cells mode is found in this compressor test rig and successfully correlates with the blade non-synchronous vibration. Furthermore, with the help of tip timing measurement, all blades vibration is also evaluated under different operating mass flow rate. Analysis results verify that the proposed model can show the blade forced vibration under stall flow condition. The overall approach presented in this paper is also important for stall vibration and resonance free design with effective experimental verification.
旋转失速限制了离心式压缩机的运行范围和稳定性，对叶轮叶片的寿命有重大影响。本文研究了失速压力波与其引起的非同步叶片振动之间的关系，这对于在早期设计阶段避免失速共振将具有重要意义。首先对时变载荷条件下的旋转圆盘进行建模，以了解失速振动背后的物理原理。然后，进行实验工作以验证模型，并揭示流道内失速单元演化过程的机制以及叶片在承受这种气动载荷时如何振动。利用机壳安装的压力传感器来捕捉低频压力波。应变片和叶尖定时传感器用于监测叶片振动。基于周向分布的压力传感器和失速参数识别方法，在该压缩机试验台上发现了五个失速单元模式，并成功与叶片非同步振动相关联。此外，借助叶尖定时测量，还可以在不同的运行质量流量下评估所有叶片的振动。分析结果验证了所提出的模型可以在失速流动条件下显示叶片的强迫振动。本文提出的整体方法对于具有有效实验验证的失速振动和共振自由设计也很重要。
