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基于传热学理论和有限元的自励式缓速器瞬态温度场数值分析,建立了转子瞬态温度场数学模型,推导了内热源强度及深度计算公式,确定了相关的边界条件,详细阐述了瞬态温度场控制方程离散化、边界条件及源项处理,研究了在不同初始转速下转子瞬态温度场的径向分布及转子外表面温度随时间的变化规律。试验表明:温度上升过程中,基于上述模型的瞬态温度理论值与试验测试值能够较好的吻合,为自励式缓速器结构散热设计提供了重要依据,同时分析了试验测试值与理论仿真之间的误差原因。
Based on the numerical analysis of the transient temperature field of the self-excited retarder based on the theory of heat transfer and the finite element method, a mathematical model of rotor transient temperature field is established. The formula of intensity and depth of internal heat source is deduced and the relevant boundary conditions are determined. The discretization of the governing equations of transient temperature field, the boundary conditions and the source term processing were studied. The radial distribution of the rotor transient temperature field and the variation of the rotor surface temperature with time at different initial speeds were studied. The experimental results show that the theoretical values of the transient temperature based on the above models agree well with the experimental values during the temperature rise, which provide an important basis for the thermal design of the retarder. Simultaneously, the experimental values and theoretical simulations The reason for the error between.