论文部分内容阅读
将弯、掠叶片的三维设计技术应用于离心风机叶轮,根据积叠线在周向和子午面内的变化,分别研究正弯、反弯、前掠、后掠、前倾、后倾、前掠正弯和后倾正弯8种叶片。通过比对不同三维设计叶片的整体气动参数、展向的总压损失分布和全周流道不同叶高的相对速度分布云图,研究不同叶片对叶栅流道气动性能和分离流动的影响。数值模拟计算结果显示,后倾、前掠、正弯、前掠正弯和后倾正弯叶片对风机的气动性能起到一定的正面影响,能有效降低叶栅流道前盘端区的总压损失,控制叶轮全周的分离流动;而前倾、后掠和反弯叶片则造成叶片在气动性能上一定程度的恶化,损失沿叶高增加,叶轮全周的流动情况均一定程度恶化。
The three-dimensional design technology of curved and swept blades was applied to the centrifugal fan impeller. According to the variation of the stacking line in the circumferential and meridional planes, the three-dimensional design of curved, swept blades, forward swept, swept, forward, backward, Swept positive and backward after bending 8 kinds of leaves. The influences of different blades on the aerodynamic performance and flow separation of cascade runner were studied by comparing the overall aerodynamic parameters of different three-dimensional design blades, the total pressure loss distribution in the span direction and the relative velocity profiles of different leaf heights of the full-circumferential runner. The numerical simulation results show that the backward, forward swept, forward, forward sweep and backward recline curved blades have a positive effect on the aerodynamic performance of the fan, which can effectively reduce the total area of the front end of the cascade flow passage Pressure loss, and control the separation of the whole flow of the impeller; while the forward, backward swept and reverse bending leaves cause the aerodynamic performance of a certain degree of deterioration of the loss along the blade height increases, the entire impeller flow were to some extent deteriorated.