基于正交数值试验的钟形进水流道导流锥优化OA

The problem of poor flow conditions in the bell-shaped inlet suction chamber of a large verti-cal submersible axial flow pump station was addressed,which resulted in poor water inflow conditions and low pump efficiency.Based on the Reynolds time-averaged N-S equations and the Realizable k-ε turbulence model,the structural optimization of the bell-shaped inlet guide cone of the pumping station was carried out using numerical simulation.The hydraulic loss of the inlet flow channel,the uniformity of the outlet velocity distribution and the average angle of water flow into the pump were selected as evaluation indicators to optimize the size of the elliptical guide cone within a reasonable range,and nu-merical simulation as well as performance comparison analysis were performed.The results show that the optimal semi-major and semi-minor axis dimensions of the guide cone are a=1.0D and b=0.4D,respectively.After optimization,the recorded hydraulic loss of the inlet passage is 0.189 m,indicating a reduction of 0.028 m compared to the original value.The outlet flow velocity uniformity is 94.28%,indicating an improvement of 10.96%.The average water inflow angle into the pump reaches 87.80°,reflecting an increase of 1.02°.The efficiency and head of the pump unit improves significantly after optimization.At the design flow rate of 7.0 m3/s,the efficiency increases from 64.39%to 67.74%,the head increases from 9.62 m to 9.98 m,and the maximum pump efficiency improvement reaches 5.81%.A model test is conducted for the optimized design.Under the design flow rate,the test effi-ciency is 67.03%,with a corresponding head of 9.82 m,indicating high performance.The simulated performance curves show good agreement with the experimental results,and the maximum efficiency deviation is less than 3%,demonstrating the reliability of the simulation results.The research findings provide valuable references for the design and optimization of bell-shaped inlet flow channels in similar pump stations.