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采用实验的方法对中心进气开式转静系转盘的风阻扭矩特性进行了研究,利用特殊的测量装置设计,实现利用静止扭矩仪测量转盘受到的风阻扭矩。结合流动参数以及转静间隙比等变量,对比研究了有无封严结构的转静系两种模型,并总结出开式转静系转盘的扭矩系数经验关系式。结果表明,转盘的风阻扭矩主要受到腔内的流动结构影响,腔内流体的流动形式,旋转主导或者通流主导对转盘扭矩系数有着不同的影响。对比自由盘,开式转静系中静盘对扭矩系数的影响与间隙比的大小有关。分析实验数据发现最小临界间隙比以及最大临界间隙比的范围,分别为G=0.02~0.04以及G=0.06~0.08,当间隙比较小且腔内旋转主导,转盘扭矩会比对应参数自由盘模型小5%~15%,而出口封严环罩会使得转盘扭矩系数增大20%。
The wind resistance torque characteristics of the central intake turntable turntable were experimentally studied. The design of special measuring device was used to measure the wind resistance torque of the turntable with the static torque meter. Combined with the flow parameters and static clearance ratio, two models of static and dynamic system with or without seal are contrastively studied, and the empirical relation of the torque coefficient of the open revolving turntable is concluded. The results show that the wind resistance torque of the turntable is mainly affected by the flow structure in the cavity. The flow pattern of the fluid in the cavity, the domination of the rotation or the domination of the through flow have different influences on the torque coefficient of the turntable. Comparison of free disk, open static system in the quiet disk on the torque coefficient and the size of the gap ratio. Analysis of experimental data found that the minimum critical clearance ratio and the maximum critical clearance ratio range of G = 0.02 to 0.04 and G = 0.06 to 0.08, respectively. When the clearance is small and the cavity rotation is dominant, the torque of the turntable will be smaller than that of the corresponding free disk model 5% ~ 15%, while the outlet seal ring cover will make turntable torque coefficient increased by 20%.