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由于增压度的提高和试验费用的增长,用数值解法来预测柴油机和废气涡轮增压器的配合工作就更为引人重视。本文报导了英国巴士大学机械系所进行的研究情况。首先比较了各种熟知的计算方法,然后指出,本文所用的物理整体计算法、采用缸内工作过程的简化表达形式和改进了的涡轮增压器表达形式,可以得到有价值的完整表达形式,并在数字计算机上实现简便的模拟。本文第一部分主要通过一级增压和二级增压高速柴油机的计算与实测结果的比较,说明数值模拟的价值。第二部分则把计算推广到更高功率和特殊增压方式的柴油机上去,计有二级增压、补燃高增压和差动复合式等柴油机,平均有效压力达21巴。计算结果与所得的测量结果相符,而且以均等的条件比较了三种增压方式的优缺点。
Due to the increase of pressurization degree and the increase of test cost, the numerical solution to predict the cooperation of diesel engine and exhaust gas turbocharger is even more important. This article reports on the research conducted by the Department of Mechanical Engineering at Bus University in the United Kingdom. First of all, it compares various well-known calculation methods, and then points out that the physical whole calculation method used in this paper can obtain a valuable and complete expression form by simplifying the expression of the working process in the cylinder and improving the expression form of the turbocharger, And in the digital computer to achieve a simple simulation. The first part of this paper mainly through the first supercharger and two supercharged high-speed diesel engine calculation and comparison of measured results illustrate the value of numerical simulation. In the second part, the calculation is extended to diesel engines of higher power and special supercharging modes, with secondary supercharged, supercharged and turbocharged composite diesel engines with an average effective pressure of 21 bar. The calculated results are consistent with the results of the measurements obtained, and the advantages and disadvantages of the three supercharging methods are compared on an equal basis.