In order to investigate the oil-air lubrication cooling performance of friction elements, this paper calculated the flow field of a hot rotating cylinder cooled by oil drop and air. The SST (shear-stress transport) k-w turbulence model and DPM (discrete phase model) model for simulation of oil drop were built and FLUENT software was employed to solve the oil-air flow field and jet flow field. The results show that as the distance between nozzle and cylinder (L) increases, the average Nusselt number (Nu) decreases, while the influence of L on the average Nu in the local zone of the cylinder varies. The rotation speed has little effect on Nu, and as Re is increased, the average Nu is increased. The cylinder is divided into four zones according to the flow behaviors, and the effects of L, Re, and Nu on each zone are discussed.%为了研究油气润滑冷却圆柱摩擦副换热机理,建立了油气润滑两相流体喷射冷却旋转发热圆柱数学模型.采用SST k-w湍流模型及离散相模型,利用FLUENT软件求解了油气流场射流流场,结果表明:随着喷射距离L的增大,圆柱表面平均Nu变小,L对圆柱局部区域的平均努赛尔数影响规律不同.随着Re增大,圆柱表面平均Nu变大.转速对圆柱表面平均Nu影响较小.对圆柱沿圆周按照流动特点分成4个区域进行讨论,并分析了喷射距离、雷诺数、转速对各个区域Nu的影响.
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