Investigations on driving flow expansion characteristics inside ejectors

摘要: Abstract This research investigates the Mach wave structure of driving flow under off-design working conditions by both numerical and experimental methods. By adopting method characteristics as simulation model, prediction regime inside an ejector is obtained. The results are further validated visualization conducted using a Schlieren system. Through this investigation, influence on boundary development discussed. expansion from nozzle exit increases in under-expanded condition, which has negative impact performance. show that should be considered when operated conditions. also demonstrate appropriate design was able to restrain effect wave, improves significant for achieving comprehensive understanding mechanism ejector, well applications, such ejection refrigeration cycles.