内燃机工程2024，Vol.45Issue(5)：11-18,27,9.DOI:10.13949/j.cnki.nrjgc.2024.05.002
风冷柴油机高负荷轴流冷却风扇气动优化
Aerodynamic Optimization of a High-Load Axial Cooling Fan for an Air-Cooled Diesel Engine
摘要
Abstract
For a cooling fan with negative prewhirl front stator of an air-cooled diesel engine,by considering the coupling effect of the stator and the rotor,the multi-objective aerodynamic optimization of the cooling fan was implemented based on the polynomial surrogate model and the non-dominated sorting genetic algorithm Ⅱ.The optimized efficiency and total pressure increased by 1.19% and 4.78% respectively under the near-stall condition,and increased by 0.29% and 3.16% respectively under the design condition.The key design variables were identified by Sobol's global sensitivity analysis method,and the flow mechanisms for improving the aerodynamic performances of the fan were obtained by combining the changes of the flow fields before and after optimization.The decrease of the hub blade angle of the stator and the increase of the hub blade angle of the rotor jointly reduce the angle of attack of the rotor inlet,thereby increasing the isentropic efficiency of the fan,and making up for the total pressure reduction caused by the decrease of Euler work.The tip blade angle of the rotor is reduced,which weakens the imbalance between the hub and the tip regions,and compensates for the loss of total pressure.关键词
风冷柴油机/冷却风扇/气动优化/全局敏感性分析/流动机理Key words
air-cooled diesel engine/cooling fan/aerodynamic optimization/global sensitivity analysis/flow mechanism分类
能源科技引用本文复制引用
任贵峰,王睿,刘正先,李孝检..风冷柴油机高负荷轴流冷却风扇气动优化[J].内燃机工程,2024,45(5):11-18,27,9.基金项目
国家自然科学基金项目(12102298)National Natural Science Foundation of China(12102298) （12102298）
