四サイクル機関の吸気効率に及ぼす熱の影響 : 吸気がシリンダ壁により熱せられるための影響

概要

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The quantity of air drawn in per stroke by 4-cycle engines will be given as [numerical formula] Where, ρ=air fuel ratio, p_1=pressure at the moment the inlet valve has just closed, p_r=residual exhaust gas pressure in the clearance space, V_s=effective stroke volume, T_s=air temperature, ΔT_1=temperature drop due to the evaporation of the fuel, ΔT_2=temperature rise of the mixture, gaining heat through the cylinder walls, and other hot surfaces, R_1=gas constant, and ε^*=effective compression ratio. Then, if we obtain the values of p_1,p_r and G_a by experiment, and knowing the values of ρ, V_s, ε^*, T_s, and ΔT_1,we will be able to calculate the value of ΔT_2 from the above equation. In this way I obtained ΔT_2≒100℃ by water cooled L-head petrol engine. This value shows that the heat exchange between the mixture and hot walls has a great influence upon the charging efficiency. For instance, if ΔT_2=0 in this case at n=2 000 r.p.m. the charging efficiency will increase to 0.98 from 0.72 and at n=3 000 r.p.m. to 0.75 from 0.55.
一般社団法人日本機械学会の論文
1953-04-15