-::: Scavenging of I.C Engines:::-
Scavenging, in internal combustion engines, is the process of removing the burnt gases from the combustion chamber of the engine cylinder. Through there are many types of scavenging, yet the following are important from the subject point of view.
A) Crossflow Scavenging:- In this method, the transfer port (or inlet port for the engine cylinder) and exhaust port are situated on the opposite sides of the engine cylinder (as in the case of the two-stroke cycle engines).
B) Backflow or loop Scavenging:- In this method, the inlet and outlet port are situated on the same side of the engine cylinder.
C) Uniflow Scavenging:- In this method, the fresh charge, whiling entering from one side (or sometimes two sides) of the engine cylinder pushes out the gases through the exit valve situated on top of the cylinder.
Note:- The Scavenging efficiency of a four-stroke cycle diesel engine is between 95 and 100 %.