12 e

being lower for IDI than for DI engines.

(b) Gas exchange parameters

For two-stroke engines, in particular, it is vitally important to make a distinction between the trapped rate of airflow maI and the total rate of airflow supplied to the engine ma. This arises from the fact that the scavenging process in two-stroke engines is accompanied by substantial loss of air to exhaust, partly through mixing with products of combustion and partly through short-circuiting (see section 1.3.1) and leads to the definition of trapping efficiency as

0 0

Post a comment