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【中文摘要】 针对目前求解换热器瞬态模型的算法收敛性不稳定的问题,提出了一种改进算法。新算法增加了压力迭代初值的预测计算。在准确求解流场前,根据工质压力与总质量的单调关系,采用总质量作为压力迭代收敛的判据,确定出与当前工质质量对应的压力,作为迭代初值。对新算法的收敛性进行了分析,认为新算法的稳定性得到增强。并将新算法应用于实际换热器的仿真计算中。 【英文摘要】 An improved transient algorithm is proposed to solve the distributed parameter model for heat exchangers. In the present method, the prediction calculation of the iterative initial pressure is added. Before the calculation of the flow rate field, the monotone relation between the pressure and the total mass is adopted to determine an appropriate iterative initial value of pressure, which will improve the algorithm stability and enlarge the algorithm applicability. It is likely that the improved algorithm could be applied in the simulation for heat exchangers. 【中文关键词】 工程热物理; 算法; 换热器; 收敛性 【英文关键词】 Engineering thermophysics; Algorithm; Heat exchanger; Convergence