Study of impinging heat transfer on vertical plate by underexpanded rectangular jet

Abstract

In this paper, the flow of underexpanded jet issued from rectangular nozzles of aspect ratio 1,3 and 5 were investigated. Two dimensional temperature distributions on vertical flat plate were measured by means of infrared image camera. The density fields were visualized by means of optical method of schlieren. As a result, the temperature variation with the pressure ratio at the plate center show that there are two clear peaks of the temperature, only for the aspect ratio of 3. Mean the two-dimensional temperature distributions for the aspect ratio of 3 reveal that the flow pattern is not plane symmetry.