農用機関の燃焼ガス漏洩に関する実験的研究 (ガス漏洩 第3報)

抄録

Applying the cylinder head with various sizes of leakage-hole, the effect of the leakage of working gas upon the faculty of the air-cooled 2 cycle engine and the water-cooled 4 cycle diesel engine under various running conditions were investigated, and the following results were
[A] As for an air-cooled 2 cycle gasoline engine;
(1) The consumption of fuel increases with the enlargement of leakage hole. In comparison with the diesel engine, the remarkable variation of the thermal efficiency due to the change of load takes place. Maximum thermal efficiency under the leakage conditions occurs at the partial load of 3/4.
(2) The liner relation is found between the maximum H. P. and the cross-sectional area of the leakage hole.
(3) The engine stops under the fuel supply of 600gm/hour, when the area of the leakagehole attains to 3.5mm².
(4) The thermal efficiency accompanied with leakage decreases under every load, exceedingly near the full load.
(5) The temperature of plug-sheet risesand that of exhaust gas falls with the enlargement of leakage hole.
[B] As for a water-cooled 4 cycle diesel engine;
(1) The temperature of hopper-water rises with either the increase of leakage area or that of burdened load. The leakage of the hole the diameter of which is 2.0mm has the same effect on the temperature rising as partial load of 3/4.
(2) Thermal efficiency increases progressively from starting until the thermal condition of cylinder becomes stable. Thermal efficiency becomes stable more quickly with the increase of the leakage as well as the load.
(3) The temperature of exhaust gas rises higher and becomes stable more quickly when the leakage as well as the load increases.