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为了改善迄今轴承腔油滴运动分析未包含油滴与空气热量传递以及油滴相/空气介质均相处理中油滴含率确定方式不够准确的不足,借助单个油滴运动分析和油滴尺寸分布提出了轴承腔油滴含率及油滴相与空气能量传递分析方法。首先在考虑单个油滴与空气对流换热条件下,将油滴能量方程嵌入运动方程,并同步离散求解油滴运动方程和能量方程,实现了单个油滴运动速度和温度的联立求解,通过与试验结果对比证明考虑温度效应有助于提升油滴速度计算的准确性;然后确定了轴承腔油滴尺寸分布,并离散油滴尺寸分布范围以及轴承腔流场空间,进行油滴运动分析确定了轴承腔不同径向位置处油滴的体积和质量含率及油滴相与空气的动能和热能传递量。构建了圆盘腔油滴含率试验台,开展了油滴体积含率的试验测量,理论计算值与试验值较为吻合,验证了轴承腔油滴含率分析方法的有效性。
In order to improve the analysis of droplet motion in bearing cavity so far, the lack of accurate calculation of the heat transfer between oil droplets and air and the determination of the oil droplet content in the homogeneous treatment of the oil drop phase / air medium is proposed by means of a single droplet motion analysis and droplet size distribution Bearing cavity oil content and oil droplet phase and air energy transfer analysis method. Firstly, the energy equation of oil droplets is embedded into the equations of motion under the condition of convection heat transfer between single oil droplets and air, and the equations of motion and energy of droplets are solved simultaneously and discretely to solve the simultaneous solution of the velocity and the temperature of a single droplet. Compared with the experimental results, it is proved that considering the temperature effect helps to improve the accuracy of the oil drop velocity calculation. Then the size distribution of the oil droplet in the bearing cavity, the size distribution of the discrete oil droplet and the flow field in the bearing cavity are determined, The volume and mass content of oil droplets at different radial positions of the bearing cavity and the kinetic energy and thermal energy transmission of the oil phase and the air are obtained. The test bench for the oil drop content of the disk cavity was constructed, and the experimental measurement of the oil drop volume content was carried out. The theoretical calculation and experimental data are in good agreement with each other to verify the effectiveness of the analysis method of oil drop content in the bearing cavity.