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提出采用数值模拟的方法研究纵流壳程换热器，以克服实验研究方式的不足．利用相似理论，确定换热器的数值模拟模型，分析了各结构参数变化对其传热和流动性能的影响，结果表明：单排管间布杆、减小折流栅间距、增大管束长径比均有利于传热，但同时也增大了流动阻力；并利用最小二乘法，进一步回归出纵流壳程换热器层流下的传热和流动阻力的准数关联式．显示出采用数值模拟方式对换热器进行研究和开发的显著优点
The method of numerical simulation is proposed to study the longitudinal shell and shell heat exchanger in order to overcome the shortcomings of experimental research. Based on the similarity theory, the numerical simulation model of the heat exchanger was established. The influence of structural parameters on the heat transfer and flow properties of the heat exchanger was analyzed. The results showed that: Diameter ratio are conducive to heat transfer, but also increase the flow resistance; and the use of least squares method to further regress the longitudinal flow shell heat exchanger laminar flow under the heat transfer and flow resistance of the correlation formula. It shows the significant advantages of using numerical simulation to research and develop the heat exchanger