抄録
Two typical flows in an internal combustion engine are represented by means of video display of the velocity vectors which are measured by laser Doppler anemometer (LDA).
The first experiment is velocity and turbulence measurements in the wedge-type combustion chamber of a two-cycle spark ignition engine. The combustion characteristics have also been observed by using high-speed shadowgraph photography, pressure and ion currents in the chamber installed in different manners on to the cylinder. The results indicate that the flow fields vary not only with arrangement of the combustion chamber but also depending on motored and firing operations due to the expansion flow of combustion. The second one is LDA measurement of continuous velocities of fuel spray from a single hole injection nozzle of a Diesel engine and air movement around the spray. Time dependent profiles of mean velocity are presented and compared with those in the steady spray flow. It is found that the air is entrained after being pushed away by the spray and a large amount of air is entrained in the spray.
