Flow Characteristics of Orifice Transonic and Supersonic Free Jets

Abstract

In this study, the flow characteristics of transonic and supersonic under expanded air free jets issued from orifice nozzle are examined experimentally by flow visualization using Schlieren method, measurements of velocity distribution by a supersonic Pitot-tube. These jets are used widely, for example, as a driving flow of ejector. The difference between the flow characteristics of pipe jet issued from a circular nozzle and orifice jet is made clear and the effects of contraction area ratio of orifice nozzle are also examined.