【摘要】 采用数值模拟研究了低速条件下附面层吸除对某超高负荷压气机叶栅气动性能的影响,分析了叶栅出口总压损失、扩压因子和气流角的沿叶高的分布,并给出了吸力面极限流线及型面静压。结果表明,附面层吸除可有效改善叶栅气动性能,低能流体被吸除使得吸力面及角区的分离减小,增大了通流能力,叶栅负荷及扩压能力得到提升,且吸气量越大改善越显著,在60%轴向弦长位置吸气效果最佳;吸气位置对吸气效果的影响要大于吸气量,适当增加吸气量可增强吸气效果,最佳吸气位置及吸气量的选定与扩压过程及栅内分离程度相关。更多还原

【Abstract】 Numerically studied was the influence of boundary layer elimination by a suction at a low speed on the aerodynamic performance of a super-highly loaded compressor cascade.The distribution of the total pressure loss,diffusion factor and air-flow angle along the blade height was analyzed,and the limit streamline and profile static pressure on the suction surface were given.It has been found that the boundary layer elimination by suction can effectively improve the cascade aerodynamic performance,and the low-energy fluid removal through a suction can decrease the separation of the suction surface and the corner area,increasing the capacity of the flow path and enhancing the cascade load and diffusion capacity.In addition,the larger the suction air flow rate,the more conspicuous the improvement.A suction at a location of 60% axial chord can achieve the best effectiveness.The influence of the suction location on suction effectiveness is larger than that of the suction air flow rate.To appropriately increase the suction air flow rate can enhance the suction effectiveness,and the selection of an optimum suction location and air flow rate is correlated with the diffusion process and separation degree inside the cascade.更多还原