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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。
By analyzing the correlation between profile parameter and structure parameter, parametric modification based on profile line is realized, so as to achieve the goal of multi-level diversion integrated wheel and impeller performance optimization. The least squares method was used to fit the impeller profile fitting. The CFD simulation results of the fitted profile model were compared with those of the original model. The results show that the simulation results are in good agreement with those of the original model test results The errors are all less than 2%, and the fitting method used can achieve profile optimization. By analyzing the correlation between the parameters of the fitting line and the installation angle of the impeller inlet and outlet, the profile of different structural parameters model is optimized and its performance is simulated and compared. The results show that the internal flow field of the three groups of profile model is normal and stable as a whole, and there is a certain range of low pressure region at the outlet of each runner and at the tongue of the volute. And because of the vortex flow at the tongue, the diffuser outlet There is a certain area of high-speed mission. Profile 3 is the optimal profile model, and its lift and efficiency values are optimized, and under the conditions of design, the performance is most obvious.