摘要
针对某可调向心涡轮导叶段存在的强激波和端壁泄漏损失,设计了一种后加载特性导叶,并在级环境下进行了研究。首先对比了原模型设计开度下的数值与实验结果,验证了数值模型的有效性,然后进行了将原模型和新模型的定常与非定常计算。结果表明:后加载型导叶在通过降低导叶端壁泄漏涡强度而减小其总压损失的同时可大幅度弱化导叶喉部和尾缘激波强度;导叶间隙泄漏流和尾缘激波的减弱使转子叶片静压波动强度降低,增强了转子叶片的可靠性。
For the strong clearance leakage flow and shock wave in the guide vane of a variable nozzle turbine, an Aft-Loaded guide vane was redesigned and studied in stage environment. A comparison between the numerical and experimental results of the original vane was carried out to validate the numerical model under the design opening condition of the guide vane. Steady and unsteady numerical simulations were implemented for the original and designed vanes. The results indicate that the Aft-Loaded vane can decrease the total pressure loss by reducing the intensity of the leakage vortex. Meanwhile, the intensity of the throat shock wave and the trailing edge shock wave could also be weakened. The intensity weakening of the trailing edge shock wave and leakage vortex could reduce the static pressure fluctuation intensity of the rotor blades, and the reliability of the rotor blades will be enhanced.
作者
杨登峰
杨策
胡良军
孙惠民
YANG Deng-Feng YANG Ce HU Liang-Jun SUN Hui-Min(School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China Ford Motor Company, Michigan 48124, USA)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2017年第10期2130-2138,共9页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51376024)
国防重点实验室基金项目(No.9140C330102130C33001)
关键词
可调向心涡轮
后加载
激波
间隙泄漏流
压力波动
variable nozzle turbine
Aft-Loaded
shock wave
clearance leakage flow
pressure fluctuation
