分流叶片周向位置设计及其对离心叶轮内部流动的影响

Design of the splitter blade circumferential position and its effect on the internal flow of centrifugal impeller

利用计算流体力学软件,对某高压比、高转速、小流量离心式压气机的半开式叶轮内部三维粘性流场进行了数值模拟研究。重点分析了分流叶片周向位置对叶轮内部流动和性能的影响,提出了适合此半开式离心叶轮分流叶片周向位置的设计方案。结果表明:分流叶片不同周向位置对流场影响明显,当分流叶片偏向长叶片吸力面侧时,叶轮流道内低速区增大,流动分布不均匀。研究还发现:固定分流叶片进口而将出口位置向长叶片压力面侧偏置,可以改善叶轮内部流动情况,提高叶轮性能。

Three - dimensional viscous internal flow was numerically simulated by using CFD method, for analyzing a centrifugal compressor impeller of high pressure ratio, high speed and low mass flow rate. The study was focused on the effect of the splitter blade circumferential position on the internal flow and the performance of centrifugal impeller. Then a suitable design scheme of the splitter blade circumferential position was proposed. The numerical results showed that the flow field performance was evidently influenced by different circumferential position. The slow velocity area was enlarged with uneven distribution of the internal flow, when the splitter blade was leaned to the suction surface of the main blade along the circumferential direction. Moreover, the study also found it could improve the flow field distribution and enhance the impeller＇ s performance, only when the outlet position of the splitter blade was removed toward the pressure surface of the main blade along the circumferential direction.