人工心脏泵水力及溶血性能多目标优化设计

Multi-objective Optimization and Design of Hydraulic and Hemolysis Performance of Artificial Heart Pump

为了优化人工心脏泵的水力性能和降低血液损伤,通过计算流体力学分析了人工心脏泵主要结构参数对效率、扬程和溶血值的影响规律,并使用单变量特征选择方法选取出口直径D2、叶片包角ψ、出口宽度b2为设计变量,以人工心脏泵的效率、扬程和溶血性能为目标函数,使用响应面法拟合设计变量与目标函数的多元回归模型,最后联合NSGA-Ⅱ遗传算法进行了多目标优化。确定最优叶轮出口尺寸:D2=41.68 mm,ψ=101.8°,b2=2.4 mm。心脏泵性能参数:效率为0.7536,扬程为100.219 mmHg,溶血值为0.0181 g/100L。与原始模型相比,在扬程满足设计要求的同时,水力效率和溶血性能均优于原始模型。

In order to optimize the hydraulic performance of an artificial heart pump and reduce blood damage,the influence of its main structural parameters on efficiency,head and hemolysis values was analyzed with computational fluid dynamics.The univariate feature selection method was used to select the outlet diameter D2,the blade wrap angleψand the outlet width b2.Variables were based on the efficiency,head and hemolysis values of the artificial heart pump.The response surface method was used to fit the multiple regression model of design variables and the objective function.Finally,multi-objective optimization was performed with the NSGA-II genetic algorithm.The optimal impeller outlet sizes are determined as:D2=41.68 mm,ψ=101.8°,b2=2.4 mm.At this time,the performance parameters of the artificial heart pump are:efficiency 0.7536,head 100.219 mmHg,hemolysis value 0.0181 g/100L.The hydraulic efficiency and hemolysis performance are superior to the original model,while the head meets the design requirements.