Study on Rotating Stall Mechanism of Mine Contra-rotating Main Fan Under Inlet Distortion Condition
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摘要: 为了揭示畸变进气条件下压入式矿用对旋风机的旋转失速机理，基于分离涡模拟方法与节流阀模型，对旋风机内部的非定常流动开展了数值模拟与分析。结果表明：对旋风机两级叶轮内的失速起始扰动均为“突发型”，均首先发生于叶顶区域，但前级叶轮较后级叶轮更早地进入旋转失速状态。后级叶轮叶根区域也同样出现了扰动，但该处扰动是独立产生和发展的。另外，两级叶轮内失速团的传播均是通过相邻叶片通道流入的反流与本叶片通道流出的反流所引起的失速团扰动强度沿叶轮周向的变化来实现的，前级叶轮内失速起始扰动与失速团的传播速度分别为叶轮转速的60.9%和35%，后级叶轮内二者的传播速度分别为叶轮转速的55%和46%。Abstract: In order to reveal the occurrence and development mechanism of the rotating stall of coal mine contra-rotating fan under distorted inlet condition, based on the detached-eddy simulation and the outlet throttle function, the numerical simulation and analysis of the internal unsteady flow in a coal mine contra-rotating fan under the rotating stall condition are carried out. The results show that stall inception in the two stage impellers are all “spike” inception, stall inception first occurs in the tip area of the two stage impellers, and the rotating stall first forms in the front impeller. The corner area at the root of the rear impeller also undergoes flow separation. However, the separation zone at the root of the blade is generated and developed independently. The propagation of the stall cells in the two stage impellers is realized by the variation of the disturbance intensity of the stall cells along the circumferential direction, which caused by the reverse flow in the adjacent blade passage and the reverse flow of the current blade passage, the propagation speed of the stall inceptions and the stall cells in the front impeller are 60.9% and 35% of the impeller speed, respectively, the two are 55% and 46% of the impeller speed in the rear impeller.
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Key words:
- distorted inlet condition /
- contra-rotating fan /
- simulation /
- rotating stall /
- stall cell
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