进气型式对压入式矿用对旋主通风机内部流动及性能的影响

Effect of intake type on internal flow and performance of mining contra-rotating main fan for forced ventilation

为了研究3种进气型式对风机内部瞬态流场的影响,采用SST k-ω湍流模型结合自动近壁面处理方法,对包括进气风道在内的压入式矿用对旋主通风机装置全流道内的三维流动进行数值模拟,并应用FFT技术对风机叶轮内部的瞬态压力变化进行频谱分析,得到叶轮流场内部的压力脉动频谱。分析结果显示,相对于无畸变进气型式,弯管畸变与复杂畸变进气型式严重恶化了对旋风机叶轮上游进气风道内的流场,从而显著降低了风机的性能;而且,第二级叶轮内部流场的压力脉动幅值最大,气流沿周向的流动不均匀性增加。

In order to study the effect of three intake types on the internal unsteady flow field of the fan,SST k-ωturbulence model is used combining with the automatic near-wall treatment method to simulate the three-dimensional flow in the whole flow passage,including the intake air duct,of a mining contra-rotating main fan for forced ventilation.The FFT technique is used to analyze the transient pressure change in the two impellers of the fan,and the pressure fluctuation spectrum of flow field in the impellers is obtained.The results show that,compared with the undistorted intake type,both the elbow distortion and the complex distortion intake types seriously deteriorate the flow field in the intake air passage upstream the first stage impeller,thereby significantly reduce the fan performance.Furthermore,the maximum pressure fluctuation amplitude appears in the internal flow field of the second stage impeller,and the non-uniformity of the air flow increases in the circumferential direction.