多翼离心风机双圆摆线叶片的响应面优化设计

Optimization Design of Response Surface of Double Circular Cycloidal Blades for Multi-blades Centrifugal Fan

针对多翼离心风机的叶片结构,设计了一种双圆摆线叶片替代传统的圆弧叶片以提高风机的气动性能。结合数值仿真与实验验证的方法,以双圆摆线叶片弦长、叶片弦高及摆线的起始位置为设计变量,采用响应面优化设计拟合出设计变量与风机静压升、风机效率之间的数学模型。通过遗传算法计算出效率不减、静压升最高优化目标下的最佳设计参数组合。计算结果表明,优化后的风机在叶轮出口处的气流更加均匀,气流速度也更高;减少了叶片吸力面上的涡旋区域,改善了气流在叶轮内的流动状态。相比于原型风机,优化风机静压升增加了40余Pa,增幅为12.1%。

Aiming at the blades of multi-blade centrifugal fan,a double circular cycloidal blade,instead of the traditional circular arc blade,is designed to improve the aerodynamic performance of the fan.Combining numerical simulation and experimental validation,there are three design variables will be considerde:the chord length and chord height of double circular cycloidal blade as well as the starting position of the cycloid as the design variables.The mathematical model between the design variables and the static pressure rise and the efficiency of fan is fitted using the response surface optimization design.The optimal combination of design parameters under the highest optimization goal of unchanged efficiency and highest static pressure rise is calculated by genetic algorithm.The calculation results show that the optimized fan has more uniform airflow and higher airflow velocity at the impeller outlet;The vortex area on the suction surface of the blade is reduced and the flow state in the impeller is improved.Compared with the prototype fan,the static pressure rise increased by more than 40 Pa,the growth rate was 12.1%.