排気管系のニサイクルディーゼル機関性能に及ぼす影響について : 第1報, 排気管長の影響について

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  • Effect of Exhaust Pipe System upon the Performance Characteristics of a Two-Stroke Diesel Engine : 1st Report, The Influence of Pipe Length
  • ハイキカンケイ ノ ニ サイクルディーゼル キカン セイノウ ニ オヨボス エイキョウ ニ ツイテ 1

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This paper deals with the influence of the exhaust pipe length upon the performance characteristics of a two-stroke engine. The two-stroke uniflow scavenged three-cylinder diesel engine was employed, and the length of each exhaust pipe was changed from 20 cm to 420 cm. The following results were obtained. (1) The optimum performance was obtained at the following pulsation factors q, i.e. q=0.24, 0.70 and 1.16, q being defined as q=nL/15c, where n : engine revolutions per minute, L : length of the exhaust pipe and c : sonic velocity in the exhaust pipe. (2) Theoretical treatment performed by one of the present authors showed fair coincidence with the experimental results. (3) The difference of output developed by the engine at good tuning and that at poor tuning was about 15%. (4) In the practical application of the present results aspecially to the variable speed engines, a shorter optimum exhaust pipe length is preferable to the longer one.

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