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Numerical Modelling of a Turbocharger Splitter-Vaned Centrifugal Impeller at off-Design Conditions Part II: Computation of Forces and Torques

机译:涡轮增压器分流叶片式离心叶轮在非设计状态下的数值建模第二部分:力和转矩的计算

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Forces and torques acting on each individual blade and on the shaft of a centrifugal impeller with splitter vanes working at off-design conditions, are computed by using the pressure integration and the momentum balance method. Two cases are examined simulating the operation of a centrifugal compressor at higher mass flows than the optimum one: the first where the Strouhal number, S_r = 146.0, corresponds to subsonic flow inside the impeller and the second one where the Strouhal number, S_r = 0.225, corresponds to transonic flow inside the impeller. For the first case, the variation of forces is more distinct in the circumferentia ion where the volute tongue is located. For the second case a bimodal distribution is observed per impeller rotation. Calculations done for impellers with backward leaned blades and with radial ending blades demonstrate the influence of the impeller exit geometry to the radial force.
机译:通过使用压力积分和动量平衡方法,可以计算作用于非设计工况下带有分流叶片的离心式叶轮的每个叶片和轴上的力和扭矩。研究了两种情况,以模拟离心压缩机在质量流量高于最佳流量的情况下运行:第一种情况,斯特劳哈尔数S_r = 146.0,对应于叶轮内部的亚音速流,第二种情况,斯特劳哈尔数S_r = 0.225对应于叶轮内部的跨音速流。对于第一种情况,在蜗壳舌所在的圆周上力的变化更加明显。对于第二种情况,每叶轮旋转观察到双峰分布。对具有后倾叶片和径向末端叶片的叶轮进行的计算证明了叶轮出口几何形状对径向力的影响。

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