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Experimental investigation of the flow behaviour inside a centrifugal impeller channel at design and off-design flow rates.

机译:在设计流速和非设计流速下对离心式叶轮通道内部流动行为的实验研究。

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摘要

An experimental study of the flow behavior inside the channels of an 8-blade backswept low specific speed impeller at design and off-design conditions is presented. The measurements took place at both the inlet and the outlet of the impeller channel at the mid height of the channel passage. The particle image velocimetry (PIV) technique was used to measure the velocity components in the inlet and outlet frames of the impeller channel. The flow behavior inside the channel, the mean normalized primary and secondary velocity components at six radial locations inside the channels, and turbulence intensity in terms of the variation in the relative velocity components were investigated at the design condition, 75%, 50%, 40%, 30% and 25% of the design flow rate. The results demonstrated a well behaved flow with no evidence of flow separation at the design condition. The fluid flow inside the impeller channel started experiencing a flow separation, when the flow rate is reduced, which propagated throughout the channel passage and caused the channel to stall with a large recirculation zone at severe off-design flow rates.
机译:提出了在设计和非设计条件下对8叶片后掠式低比叶轮的通道内流动行为进行的实验研究。测量是在叶轮通道的入口和出口处在通道通道的中间高度进行的。粒子图像测速(PIV)技术用于测量叶轮通道入口和出口框架中的速度分量。在设计条件下(75%,50%,40),研究了通道内的流动特性,通道内六个径向位置处的平均归一化初级和次级速度分量以及相对速度分量变化的湍流强度。设计流量的%,30%和25%。结果表明流动良好,在设计条件下没有流动分离的迹象。当流速降低时,叶轮通道内部的流体流开始经历流分离,该流体在整个通道通道中传播并导致通道在严重的非设计流量下因较大的回流区而失速。

著录项

  • 作者

    Altaf, Ammar Mohammadnour.;

  • 作者单位

    University of Waterloo (Canada).;

  • 授予单位 University of Waterloo (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2007
  • 页码 208 p.
  • 总页数 208
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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