Effect of nozzle exit position (NXP) on variable area mixing ejector

Abstract

A number of numerical and experimental studies have been devoted to the modeling of high-performance steady-flow ejectors in different fields of application. This study presents a comprehensive numerical, experimental study and analysis on the effect of nozzle exit position (NXP) on variable area mixing ejector. The variable area mixing ejector has been developed based on a one-dimensional constant rate momentum change gas dynamic theory. The study is performed at various NXPs for a fixed geometry and operating conditions of an ejector for air as a working fluid. It is observed that the global performance parameter entrainment ratio (ω) is very sensitive to the NXP for a fixed geometry and operating condition. Results indicate that the numerical and experimental maximum entrainment ratios (i.e., 0.591 and 0.512) occur at NXP 0 (on-design) and 1 cm, respectively. The overall best performance can be achieved at on-design working conditions (i.e., NXP = 0) for variable area mixing ejector.