Starting Aid by Inlet Throttling of Scavenging Pump in Two-Cycle Diesel Engine

抄録

The temperature rise of the inlet-air due to throttling is very useful for starting aid in diesel engines as described in the previous papers. To the two-cycle diesel engine with a scavenging pump, the same method has been applied, throttling the inlet side of the pump. The theoretical calculation and the measurement of the scavenge air temperature were carried out for the various throttle ratios, which contain throttle area, stroke volume, and rotating speed. Results obtained are summarized as follows : (1) The scavenge air temperature rises as the throttle ratio decreases. For the same throttle ratio, the temperature rise becomes large with an increasing rotating speed of the pump. (2) In a practical engine, the minimum starting temperature of cooling water was lowered by about 30°C when applying this method for a certain throttle ratio.