畸变进气对对旋风机单级运行内流特性及性能的影响  

Influence of inlet distortion on internal flow characteristics and performance of contra-rotating fan in single-stage operation

作　　者：陈庆光[1] 张祯江 徐延辉 郭武 CHEN Qingguang;ZHANG Zhenjiang;XU Yanhui;GUO Wu(College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学机械电子工程学院,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2023年第3期103-110,共8页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：山东省自然科学基金项目(ZR2021ME242)。

摘　　要：为对压入式矿用对旋风机在畸变进气条件下单级运行方案的合理选择提供理论依据,采用SST k-ω湍流模型对风机前级和后级叶轮单独运行情况下的内部流场进行非定常数值模拟,分析了均匀和畸变两种进气条件下单级叶轮运行时的内流特性,对比了全压和全压效率等风机性能参数。结果表明:当前级叶轮单级运行时,畸变进气对流动的影响集中在前级叶轮上游区域,前级叶轮出口直至扩散器区域内流动扰动较小;后级叶轮单级运行时,畸变进气加剧了前级叶轮作为前导叶对后级叶轮区域内流动产生的不利影响,两级叶轮内熵损失较均匀进气条件显著增大,扩散器内的湍流程度加剧。与后级叶轮单级运行相比,前级叶轮单级运行受畸变进气影响而导致的流动损失较小,全压效率提高约11%。In order to provide a theoretical basis for the rational selection of the single-stage operation scheme of forced mine contra-rotating fans under inlet distortion,this study first conducted an unsteady simulation of the internal flow field of the fan’s front-stage and rear-stage impellers operating independently by using the SST k-ωturbulence model.It then analyzed the internal flow characteristics of the single-stage operation under uniform and inlet distortion conditions and compared the performance parameters of the fan such as full pressure and full pressure efficiency.The results show that the influence of the inlet distortion on the flow is concentrated in the upstream area of the front-stage impeller whereas the flow disturbance in areas from the outlet of the front-stage impeller to the diffuser is small when the front-stage impeller is in operation.However,when the rear-stage impeller operates,the inlet distortion exacerbates the adverse effect of the front-stage impeller as the front guide vane on the flow in the region of the rear-stage impeller.Compared with the uniform intake condition,the two-stage impeller entropy loss increases significantly and the turbulence of flow in the diffuser is increased.The flow loss caused by the influence of inlet distortion in the front-stage impeller operation is less than it is in the rear-stage operation and the full pressure efficiency is improved by about 11%.

关 键 词：对旋风机 畸变进气 单级运行 流动特性 风机性能 

分 类 号：TH431[机械工程—机械制造及自动化]