论文部分内容阅读
为了研究叶尖间隙效应对跨声速转子性能的影响机制,以一跨声速级轴流压气机为对象,采用商用软件NUMECA进行三维定常数值求解。结果表明:随着叶尖间隙的增加,峰值效率下降,堵塞流量减小,当叶尖间隙大于0.5τ(τ代表设计间隙)时,峰值效率敏感度曲线与叶尖间隙呈线性关系;综合考虑喘振裕度和峰值效率,该压气机存在最佳叶尖间隙0.5τ,此时的峰值效率和喘振裕度较设计间隙下分别提高约0.22%和3.1%。根据流动特点的不同可以将整个叶尖弦长范围内的叶尖泄漏流分为三个部分,分别为主泄漏区、二次泄漏区和普通泄漏区,且每个泄漏区在叶尖流动结构中的作用各不相同。不同叶尖间隙下压气机的失速过程的主导因素会发生改变。
In order to study the mechanism of the effect of tip clearance on transonic rotor performance, a three-dimensional steady-state numerical solution using commercial software NUMECA was taken as a transonic-speed axial-flow compressor. The results show that with the increase of the tip clearance, the peak efficiency decreases and the flow of the plug decreases. When the tip clearance is larger than 0.5τ (τ stands for the design clearance), the peak efficiency sensitivity curve has a linear relationship with the tip clearance. Surge margin and peak efficiency, the compressor has the best tip clearance 0.5τ. The peak efficiency and surge margin of this compressor are increased by about 0.22% and 3.1% respectively over the designed clearance. According to the different flow characteristics, the tip leakage flow in the entire tip chord length can be divided into three parts, namely the main leakage zone, the secondary leakage zone and the ordinary leakage zone, and each leakage zone is in the tip flow structure In the role of different. The leading factor of the stalling process of the compressor at different tip clearances will change.