静圧過給舶用ディーゼル機関の排気脈動の研究 : (第1報計算手法の比較, 脈動特性)

概要

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The conventional characteristic method has been used almost exclusively in analysing the unsteady flow in internal combustion engines for a long time.<BR>In this paper, the Two-step Lax-Wendroffs method, one of the methods called difference calculus, is proved to be very useful in the analysis of unsteady flow in internal combustion engines, because of some features of the method.<BR>The conventional method has the disadvantages that the simulated flow quantity at a crosssection of the flow stream is not always equal to that at other sections and that the required calculation time is rather too long.<BR>By using the Two-step Lax-Wendroffs method, the mentioned problems have been solved.<BR>Other items discussed in this report are (1) a comparison of pulses near the ports during blow-down in an experimental unit for a single blow-down with that in a unit for periodically continuous blow-downs, (2) the wave characteristics at a pipe-end nozzle and at an orifice in the pipe, and (3) the difficulty of obtaining similar pulsations in all the connecting ducts which connect cylinders with the main exhaust pipe in actual engines.
社団法人日本マリンエンジニアリング学会の論文