论文部分内容阅读
基于N-S方程和标准κ-ε模型对出口等速度环量的轴流式模型泵在不同工况下进行了全流道数值模拟,给出了叶片表面相对速度和压力的分布规律,并将叶轮出口处速度分量计算结果和球形五孔探针测量结果进行比较。分析结果表明:叶片表面的相对速度沿径向逐渐增大,流动分布规律符合圆柱层无关性假设;叶片发生汽蚀的危险区域约位于吸力面外缘进口边到出口边的1/4位置;最优工况下叶轮出口处流场呈螺旋形向外运动趋势,出口旋转动能占出口总动能的34%左右;速度环量测量值从轮毂至轮缘逐渐减小,设计中应适当减小轮毂处圆周分量值,增加轮缘处圆周分量值。研究结果揭示了叶轮表面和出口流动规律,为轴流泵优化设计提供了理论和实际应用参考。
Based on Navier-Stokes equations and standard κ-ε model, the full-flow numerical simulation of axial flow pump with constant velocity annular volume at the exit was carried out under different operating conditions. The distribution of relative velocity and pressure on the blade surface was given. The velocity component at the exit is compared with the spherical five-hole probe measurement. The results show that the relative velocities of the blade surfaces increase along the radial direction, and the flow distribution is in accordance with the assumption of cylindrical layer independence. The dangerous area where the blade cavitation occurs is about 1/4 of the inlet to the outlet of the suction edge. In the optimal condition, the flow field at the outlet of impeller turns spirally outward, and the rotational energy of outlet rotation accounts for about 34% of the total outlet kinetic energy of outlet. The measured values of velocity and ring volume decrease gradually from the hub to the rim, and the design should be properly reduced The value of the circumferential component at the hub increases the value of the circumferential component at the rim. The research results reveal the law of flow at the impeller surface and outlet, which provides theoretical and practical reference for the optimization design of axial-flow pump.