不足膨張噴流の干渉に関する研究 : 第1報,2個の平行な噴流の干渉特性

抄録

From the standpoint of engineering and industry or space engineering, it is important to study the interference characteristics of an underexpanded jet. It is the purpose of our studies to clarify the basic interference characteristics of underexpanded jets issuing from several pipes towards the atmosphere. In this paper, the interference characteristics of two parallel underexpanded jets for various intervals between two pipe axes were studied. In particular, the flow visualizations of both mean and instantaneous flows with time, the pressure and velocity distributions, and the equi-velocity diagrams within a vertical section to the jets axes were investigated. Moreover, using two light sources, the flow visualizations by simultaneous exposure of the mean and instantaneous flows with time were attemped. As a result, it was found that the mean and instantaneous flows could be visualized simultaneously, and moreover that these jetflows could be classified into 3 patterns.