多级导流诱导轮与叶轮一体型线优化

通过分析型线参数化系数与结构参数的相关性联系,实现基于型线的参数化改型,从而达到多级导流一体式诱导轮与叶轮性能优化的目的。采用最小二乘法实现叶轮型线拟合,将拟合型线模型的计算流体力学(CFD)仿真结果与原模型的试验结果进行对比,结果表明:仿真结果与原模型试验结果扬程值和效率值误差均小于2%,使用的拟合方法能够实现型线优化。通过分析拟合型线参数化系数与叶轮进出口安装角等的相关性联系,对不同结构参数模型进行型线优化,并对其性能进行仿真对比。结果表明:3组型线模型的内流场整体上正常稳定,其叶轮的各个流道出口和蜗壳隔舌处存在一定范围的低压区,且由于隔舌处漩涡流动的影响使得扩散管出口存在一定区域的高速团。型线3为最优的型线模型,其扬程值与效率值均达到了优化目的,且在设计工况下,其性能提高最为明显。 

Profile optimization of multi-diversion combination inducer and impeller

As the research objective is to optimize the performance of the combination multi-diversion inducer and impeller, this paper carries out the profile optimization study based on the correlation analysis of profile parameters with the structural parameters. Using the least square method, we obtained the fitting profile of the impeller, then compared the computational fluid dynamics (CFD) simulation results of the fitting model with the experimental results of the original model. The contrast shows that the error values of head and efficiency are less than 2%, and identifies the fitting method's accuracy. Finally, we compared the performances of the different fitting models through analyzing the correlation between fitting coefficient and impeller's inlet and outlet structural parameters. The results show that the internal flow fields of the three fitting models are stable. The impeller outlet and volute tongue have some low-pressure areas, and a certain high-speed group exists at the diffuse outlet because of the influence of vortex flow at the tongue. Ultimately, the head and efficiency of profile-3 are most optimized and obviously at the design point.