具有分流叶片跨声速离心叶轮激波及能量损失分析

对具有分流叶片跨声速离心叶轮，采用激波基本关系式对数值信息进行分析和判定，理论证实了叶轮流道中激波的存在，并确定流道内高速气流易在主叶片前缘、分流叶片前缘以及主叶片的吸力面与分流叶片的压力面通道位置形成激波.进一步对比分析了叶顶间隙和运行工况对激波位置分布特征的影响及引起的能量损失.结果表明:固定叶顶间隙下，随着流量减小，激波位置向流道上游移动；叶顶间隙导致激波线位置向流道下游偏移；分流叶片前缘处有最强激波并引起较明显能量损失. 

Analysis on shockwave and energy loss in transonic centrifugal impeller with splitter blades

Based on typical transonic centrifugal impeller with splitter blades, the numerical simulation results were analyzed and judged by the basic formula of shockwave. The existence of shockwaves in the flow passage of impeller was proved theoretically. Result shows that, the high-speed air flow easily formed shockwaves at the leading edges of the splitter blade and the main blade, and also at the flow channel between the suction surface of main blades and the pressure surface of splitter blades separately. The distribution characteristics of shockwave lines affected by the tip clearance and the working condition were compared, furthermore the energy loss of shockwave was analyzed. Result shows that, the position of shockwave lines move upstream with the decreasing flow rate at a constant tip clearance, the tip clearance makes the shockwave lines move to the downstream flow passage, and the strongest shockwave is generated at the leading edge of the splitter blades, leading to obvious energy loss.