非轴对称安装角对压气机转子叶片性能的影响

Impacts of non-axisymmetric stagger angle on performance of compressor rotor blade

为了给高压压气机叶片全工况的工程设计和加工制造提供借鉴,进行了多案例的单通道和8通道定常及非定常数值模拟,探究了设计点和非设计点工况下安装角非轴对称布局对压气机性能的影响。研究结果表明:非轴对称安装角方案在设计点工况下性能参数相较于均匀安装角降低,且在近堵点时流量的分散度更大。非轴对称安装角使得叶片表面压力系数波动较大,导致转子效率下降明显。在均匀安装角偏差小但标准差大的非轴对称安装角典型方案中,由于其通道中存在较原型偏离大的安装角叶片,从而使得大流量点工况下48%~82%叶高流动分离,降低了出口气流角和效率。在近失速点,该典型方案在轮毂处角区分离较原型明显增强,在10%叶高处扩散因子较原型高负荷设计高出了0.72%,导致了失速裕度减小。

In order to provide a reference for engineering design and manufacture of high pressure compressor blades at all operating conditions, steady and unsteady numerical simulations on multiple single-passage and eight-passage cases were conducted,and the impacts of nonaxisymmetric stagger angle distribution on compressor performance were investigated at the design and off-design operating points.The results showed that the performance parameters of nonaxisymmetric stagger angle cases were all lower than those of the uniform stagger angle cases,and the scatter range of the mass flow rate was wider at the near choking point.Non-axisymmetric stagger angle distribution made the pressure coefficients on the blade surface vary more greatly,which led to obvious decrease of the rotor efficiency.In the typical case with a small average deviation and a large standard deviation of the non-axisymmetric stagger angle distribution,because a blade among the passages greatly deviated from the stagger angle of the original blade,flow separation occurred within the range of 48%-82% blade span at the large flow rate condition,which decreased the outlet flow angle and efficiency.At the near stall point,compared with the original case,the corner separation at the hub of the typical case increased obviously.The diffusion factor at 10% blade span was 0.72% higher than the original high-loading design, which led to a decrease in the stall margin.