扩压器对基本级性能的影响

发布时间：2018-05-28 00:48

本文选题：离心压缩机 + 基本级　；参考：《航空动力学报》2017年01期

【摘要】：使用数值方法和试验手段研究了带无叶扩压器和不同进口安装角的叶片扩压器对基本级的性能影响.针对带无叶扩压器的基本级,重点研究了近喘振点、设计点、近阻塞点3种工况的内部流动特性,结果表明近喘振点的叶轮叶片进口、叶轮叶片出口、回流叶片背面均存在低速涡流区,而设计点和近阻塞点的流动状态良好,对于近阻塞点,流动速度较大引起的摩擦阻力损失增大,导致了基本级多变效率下降很快;对带单圆弧叶片扩压器的基本级,细致地研究了匹配不同进口安装角的单圆弧叶片扩压器对喘振裕度、阻塞裕度和效率的影响,结果表明:在出口安装角不变的情况下,扩压器进口安装角比设计值降低3°,基本级的多变效率和多变能头系数达到最佳值.
[Abstract]:The effect of blade diffuser with vaneless diffuser and different inlet mounting angle on the performance of basic stage was studied by numerical method and experimental method. According to the basic stage of the impeller with vaneless diffuser, the internal flow characteristics of the near surge point, the design point and the near blocking point are studied. The results show that the impeller blade inlet and the impeller blade outlet are near the surge point, the impeller blade inlet, the impeller blade outlet, the impeller blade inlet, the impeller blade outlet and the impeller blade outlet. There is a low speed eddy current region on the back of the reflux blade, but the flow state of the design point and the near blocking point is good. For the near blocking point, the friction resistance loss caused by the large flow velocity increases, which leads to the fast decrease of the variable efficiency of the basic stage. For the basic stage of single arc blade diffuser, the influence of single arc blade diffuser with different inlet mounting angles on surge margin, blocking margin and efficiency is studied in detail. The results show that: when the outlet mounting angle is constant, the influence of single arc blade diffuser on surge margin, blocking margin and efficiency is studied. The inlet mounting angle of the diffuser is 3 掳lower than the design value, and the variable efficiency of the basic stage and the coefficient of the variable energy head reach the optimum value.
【作者单位】：西安交通大学能源与动力工程学院;西安陕鼓动力股份有限公司;
【基金】：国家重点基础研究发展计划(2012CB026000)
【分类号】：TH452

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