Experimental investigation on the performance of dual-evaporator refrigeration system with an ejector has been carried out In this study, HFC-134a is chosen as a working fluid. Test setup is composed of compressor, condenser, expansion valves, two evaporators, and ejector which is installed between two evaporators. The condenser and two evaporators are made as concentric counter-flow type heat ...

There are several ways of improving the performance of a vapor compression refrigeration cycle. Use of an ejector as expansion device is one of the alternative ways. The present paper aims at evaluate the performance improvement of a vapor compression refrigeration cycle under a wide range of operating conditions. A numerical model is developed and a parametric study of important parameters suc...

The present paper performs experimental and numerical investigations on the global performance and internal flow of a supersonic air ejector. The effects of operation parameters and geometrical factor on the air ejector performance have been analyzed. The results show that: the static wall pressure and axisymmetric line static pressure remain constant in critical mode under different discharged...

The formation and evaporation of nanodroplets in steam ejectors is neglected many numerical simulations. We analyse the influence a primary nozzle on ejector performances considering phase change processes. model validated detail against experimental data supersonic nozzles available literature. results show that first nonequilibrium condensation observed within nozzle, while under-expanded flo...

Abstract The examination of small turbojet engines for unmanned aviation systems is a main research activity at the Institute Aeronautical Engineering Universität der Bundeswehr München. special requirements design these propulsion include compact installation size, high reliability and low acquisition costs. But overall efficiency, exhaust gas temperature excessive noise emission limit options...

Reduction of energy expenditures required for various technological processes is a pressing issue in today’s economy. One the ways to solve this regard liquefied natural gas (LNG) storage recovery its vapours from LNG tanks using an ejector system. In that respect, studies on outflow real through nozzle, main element ejector, and identifying differences ideal outflow, are high relevance. Partic...

Liquid-gas ejector is an energy conversion device capable of flowing air fluid by utilizing water based on the pressure difference between two fluids without using moving parts. This study aims to determine effect changes in nozzle geometry two-phase flow performance liquid-gas ejector. The method used conducting experiment whose stages include: determining parameter, primary rate, and secondar...

The efficiency of annular-nozzle ejectors serving as components complex technical systems interacting with high-temperature media in engines and the field energy technologies is not linearly related to gas-dynamic characteristics flows formed device. In this paper, we have analyzed results numerical experimental studies gas jets an air ejector. regression equations built according circumscribed...