柴油机排气管内不定常流的分析和计算
An Analysis and Calculation of Unsteady Flow through Exhaust System of Diesel Engines
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摘要: 本文利用特征线法,对柴油机排气管内的不定常非等熵流动进行了分析、计算.由于在计算中,特别是在边界条件的计算中做了较好的归结和处理,因而使得计算程序具有一定的通用性,收敛也相当快.文章以6135涡轮增压柴油机排气管为例进行数值计算,结果相当满意.Abstract: In this paper we make analysis and calculation for unsteady non-homoentropic flow through earhaust system of diesel engines by means of the characteristic method. With reference to certain rational reduction and treatment introduced into calculation, particularly for boundary conditions,the program of calculation is to have general applicability,while the convergence is quite fast.Finally, we take exhaust system of 6135 tvbocharged engines as an illustrative example, its numerical results are quite good.
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[1] Benson,R.S.,et al,A numerical solution of unsteady flow problems,Intern J,of Mech.Sci.,6,1,(1964),117-144. [2] Benson.R.S.,et al,Unsteady flow in simple branch systems,Thermodynamics and Fluid Mechanics Convention,Paper 17,IME,Cambridge.9-10,April,(1964). [3] Benson,R.S.,et al,Unsteady flow in pipe with gradual or sudden area changes,Thermodynamics and Fluid Mechanics Convention,Paper 16,IME,Cambridge,9-10,April,(1964). [4] Wards.W.A.,et al,On the selection of a root of a quadratic equation applied to a problem in gas dynamics.J.of Royal Aeron.Soc.,69. 655,July(1965). -
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