Theoretical and Experimental Analysis of the Constant-Area, Supersonic-Supersonic Ejector.

摘要

A preliminary theoretical and experimental analysis was conducted of the constant-area, supersonic-supersonic ejector wherein one supersonic stream is pumped directly by another inside a confining duct. The theoretical analysis, based on a one-dimensional treatment of the constant-area mixing section and inviscid interaction region, is well suited to parametric evaluations and ejector optimization procedures. The experimental investigation of four, small-scale axisymmetric ejector configurations show (i) that the one-dimensional theory predicts maximum ejector compression ratios which are approximately 15 to 20 percent higher than the corresponding experimental values and (ii) that this ejector appears to be particularly susceptible to secondary flow separation. The one-dimensional analysis of the constant-area, supersonic-supersonic ejector was incorporated with a one-dimensional analysis of the conventional constant area, subsonic-supersonic ejector into a pumping system optimization procedure applicable to high-energy, chemical laser systems and supersonic wind tunnel systems. A comparison of optimum pumping system data shows that under certain conditions, a supersonic-supersonic pumping system has the potential for improved performance over that of a subsonic-supersonic pumping system. (Author)