抄録
The underexpanded jet is broadly used in industries such as a cooling jet of heat-tempered glass and an assist gas of laser cutting In this study, a cooling effect was examined of the underexpanded jet impinging on a flat plate. The temperature distribution is visualized using a liquid crystal sheet, and additionally the static and total pressures are measured on the plate. As a result, two cooling rings appear on the plate and these locations are fixed regardless of nozzle-plate spacing.Furthermore, the raynolds number distribution was found to be independent of the nozzle-plate spacing Finally, the relation between the temperature and pressure distributions is discussed.
