Influence of Tip Clearance on Blade Vibration of Vaneless Radial Turbine

• 作者: Lei Pan Ming-yang Yang Shouta Murae Wataru Sato Naoto Shimohara Akihiro Yamagata
• 来源期刊: 风机技术
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Fluid-structure Interaction Numerical Method
• 页码范围: 46-55
• 页数: 10页
• 语种: 中文
• DOI: 10.16492/j.fjjs.2021.03.0006

摘要

With the increasing demand of turbochargers with high performance and low turbo lag, high cycle fatigue (HCF) of radial turbine blades has become the most common form of turbocharger failure. Tip clearance is the key to influencing the strength and evolution of tip leakage vortex which plays an important role in HCF due to the impact on aerodynamic excitation. This paper studies the influence of tip clearance on blade excitation of a vaneless radial turbine. One-way fluid-structure interaction numerical method is employed in this research, which is validated by experimental data. The results suggest that a‘V-shape’correlation exists between vibration amplitude and tip clearance. Generalized energy analysis indicates that complex distributions of harmonic pressure amplitude on the blade determine the‘V-shape’correlation. Flow field analysis further suggests that distributions of harmonic pressure amplitude on pressure surface and suction surface are both dominated by tip leakage vortex, whereas the mechanisms are quite different.