贯流风机叶轮参数的模拟研究

摘要

贯流风机叶轮参数对风机性能有着决定性的影响,基于某企业提供的原型叶轮,通过二维稳态模拟探讨了叶轮前后缘半径Ri与Ro、叶片倾角a以及叶片弯度角γ等3个重要叶片参数对空调用贯流风机流场和性能的影响.结果表明,叶片前后缘半径比对叶片壁面边界层分离存在较大影响,当Ri/Ro>1时,通常能够较好地抑制边界层分离,得到较大的出口流量;对于原型叶片而言,其倾角a的最佳取值范围介于25°到30°之间,且随a增大,叶轮入口流场波动减小;弯度角γ越大,叶轮对气流做功越多,γ为90°时,取得最大流量值716.47 m3/h,相比原叶轮,流量提升4.04％.%Impeller parameters have great effect on the performance of the cross flow fan. Based on the blade provided by a company,the influences of several important blade parameters such as leading radiu(Ri),rear radiu(Ro),blade tilt angle (a) and camber angle(γ) on the flow field and performance of the cross flow fan,has been studied by two-dimensional steady simulation.The results show that,the ratio ofRi and Ro has great effect on boundary-layer separation of the blade surface,the boundary layer separation is inhibited and higher outlet flow rate is obtained whenRi/Ro>1. Blade tilt angle a of the prototype blade can be chosen in the ranges 25°≤a≤30°,and in which range,the fluctuation of the impeller inlet flow decreases with a increases. The greater the camber angleγ,the more the impeller works on the airflow. Moreover,when γ is equal to 90°,the flow rate achieves the maximum of 716.47 m3/h,enhanced 4.04％ compared to the original impeller.