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在传统制动电阻设计中,获得电阻元件表面传热系数主要依靠设计经验或者定型产品的温升试验数据,并没有定量的计算方法。为了准确计算制动电阻运行过程中的瞬态温度变化情况,验证制动电阻设计方案的可行性,利用数值计算方法对制动电阻元件表面传热系数进行了研究,以稳态条件下求出的表面传热系数为基础,建立了电阻元件的瞬态温升计算模型,并综合分析了导热和辐射换热对电阻元件温度的影响。通过与制动电阻产品温升试验数据的对比,验证了该瞬态温升计算模型的准确性,为制动电阻工作温度的模拟提供了简便高效的方法。
In the traditional design of the braking resistor, the heat transfer coefficient of the surface of the resistance element mainly depends on the design experience or the temperature rise test data of the shaped product, and there is no quantitative calculation method. In order to accurately calculate the transient temperature change during the operation of the braking resistor and verify the feasibility of the braking resistor design scheme, the heat transfer coefficient of the braking resistor element is studied by numerical calculation. Under steady state conditions, Based on the surface heat transfer coefficient, the transient temperature rise calculation model of the resistance element is established, and the influence of the heat transfer and radiation heat transfer on the temperature of the resistance element is comprehensively analyzed. By comparing with the temperature rise test data of the brake resistor, the accuracy of the transient temperature rise calculation model is verified, which provides a simple and efficient method for the simulation of the operating temperature of the brake resistor.