Effects of the Radial Gap Between Impeller Tips and Volute Tongue Influencing the Performance and Pressure Pulsations of Pump as Turbine
Effects of the Radial Gap Between Impeller Tips and Volute Tongue Influencing the Performance and Pressure Pulsations of Pump as Turbine
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DOI：
10.1115/1.4026544
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发表时间：
2014-05
影响因子：
2
通讯作者：
Sun-sheng Yang;Hou-lin Liu;K. Fanyu;Xiao Bin;Linwei Tan
中科院分区：
文献类型：
--
作者：
Sun-sheng Yang;Hou-lin Liu;K. Fanyu;Xiao Bin;Linwei Tan
叶轮叶尖与蜗舌之间的径向间隙是影响涡轮泵整体性能和非定常压力场的重要因素。本文首先对具有不同径向间隙的PAT的稳态性能进行了数值研究。结果表明，PAT存在一个最佳的径向间隙，使其效率达到最高。对PAT非定常压力场的分析表明，旋转叶轮与文具蜗壳的转子相互作用会引起蜗壳内的高频非定常脉动和叶轮内的低频非定常压力脉动。高频非定常压力脉动将通过PAT的流道传播。因此，叶轮内的非定常压力场是这两种压力脉动的综合作用。出口管内的非定常压力脉动主要是由蜗壳内形成的非定常压力的传播引起的。随着径向间隙的增大，蜗壳内动静干扰引起的高频非定常压力脉动的幅度减小，而叶轮内部动静干扰引起的低频非定常压力脉动的幅度保持不变。
The radial gap between the impeller tips and volute tongue is an important factor influencing the overall performance and unsteady pressure fields of the pump as turbine (PAT). In this paper, a numerical investigation of the PAT's steady performance with different radial gaps was first performed. The results show that there is an optimal radial gap for a PAT to achieve its highest efficiency. An analysis of the PAT's unsteady pressure fields indicates that the rotorstator interaction of a rotating impeller and stationery volute would cause high frequency unsteady pulsation within the volute and low frequency unsteady pressure pulsation within the impeller. The high frequency unsteady pressure pulsation would propagate through the PAT's flow channel. Thus, the unsteady pressure field within the impeller is the combined effect of these two kinds of pressure pulsations. The unsteady pressure pulsation within the outlet pipe is mainly caused by the propagation of unsteady pressure formed within the volute. With the increase of the radial gap, the amplitude of high frequency unsteady pressure pulsation within the volute caused by the rotor-stator interaction is decreased, while the amplitude of the low frequency unsteady pressure pulsation caused by the rotor-stator interaction within the impeller remains unchanged.