Thermal Effect upon Air Capacity of the Four-Stroke Engine : 1st Report, Thermodynamical Analysis Method

抄録

The temperature changes of the mixture gas in the induction process are given using the following notation : ΔT₁ : Vaporization of fuel, ΔT₂ : Ram effect, ΔT₃ : Preheating for intake mixture, ΔT₄ : Heat transfer from high temperature parts, ΔT₅ : Mixing with residual gas. The change ΔT₅ has almost no effect on air capacity, but ΔT₂, ΔT₃ and ΔT₄ change with engine types, operation and atmospheric conditions. Report No. 1 has expressed the sum of ΔT₂, ΔT₃, and ΔT₄ (called ΔT_{2, 3, 4}) as a function of the directly measurable intake mixture gas weight and the cylinder pressures. The suction end temperature T₁ is a function of ΔT_{2, 3, 4} and pressures needed for thermodynamical analysis. It has become possible to determine each of the changes ΔT₁ to ΔT₅ analytically. Finally the relationship between the air capacity and various temperature rises of the mixture gas is expressed theoretically.