泵站钟形进水流道吸水室后壁形状的研究

The back wall shape of suction chamber of bell-shaped inlet duct at pumping station

基于三维不可压缩流体的雷诺平均N-S方程和RNGk-ε紊流模型,对矩形、半圆形和"ω"吸水室后壁形状的钟形进水流道泵装置进行了三维紊流数值模拟,并分析了钟形进水流道后壁形状对泵装置水力特性的影响。相同流量下,"ω"形吸水室进水流道流线分布最规则,漩涡比其他形状的进水流道小,"ω"形吸水室进水流道水力损失比矩形吸水室进水流道小1cm;出口断面的流速均匀度达到93%,比矩形和半圆形吸水室进水流道高约2个百分点;出口断面速度加权平均角度达到83.5°,比矩形吸水室进水流道高0.6°,比半圆形吸水室进水流道高0.2°;泵装置运行高效区流量范围比半圆形的拓宽了7.3%,比矩形的拓宽了30%。该研究对于完善泵站钟型进水流道吸水室优化设计具有一定意义。

Based on the Reynolds averaged Navier-Stokes equation for three-dimensional incompressible fluid and the RNG k-epsilon turbulence model,we conducted numerical simulation of three-dimensional turbulent flow in bell-shaped inlet ducts with a rectangular,a semicircular,and aω-shaped suction chamber,and analyzed the influence of wall shapes on the hydraulic characteristics of a pump device.Under the same flow rate,the inlet duct with aω-shaped suction chamber had the most regular streamline distribution and the smallest vortex among the three types of ducts.Its hydraulic loss was 1cm smaller than that of the rectangular suction chamber.Its velocity uniformity at the outlet section reached 93%,which was 2percentage points higher than that of the rectangular and semicircular chambers.Its weighted average angle of velocity at the outlet reached 83.5°,which was 0.6°higher than that of the rectangular chamber duct and 0.2°higher than that of the semicircular chamber duct.Its flow range in the high efficiency area of pump operation was 7.3%wider than that of the semicircular chamber and 30% wider than that of the rectangular chamber.This research has certain significance for optimal design of the suction chamber of bell-shaped inlet duct.