Unidirectional flow scavenging

A scavenging process of two-stroke engines. One of the characteristic features is that the flow of fresh charge does not follow a path opposed to that of the burnt charge; scavenging and exhaust ports are not located at the same stroke end of the piston but rather are staggered, i.e., the fresh charge flows along the length of the cylinder without its direction being reversed. This process is widely used in large engines, e.g., for ships