Till now

little research on wet steam in steam-water jet technology has been reported.But to a large extent

low pressure steam used in industry is of certain dryness.Therefore

a set of experimental apparatus was designed by using wet steam as working medium

and a multi-nozzle steam-water ejector was used as the experimental device.The influence of steam pressure and steam dryness and discharge pressure on the performance of the multi-nozzle ejector was analyzed.As can be seen from experimental results

the translation of the curve describing the relation between steam mass flow rate and steam pressure was caused by steam dryness.Entrainment ratio increased with steam dryness.Both entrainment ratio and steam mass flow rate increased with steam pressure at a low steam pressure.As steam pressure increased

cold water was blocked when the length of steam plume was equal to the distance between nozzle exit and inlet of throat section and entrainment ratio began to decrease

however

the decrease of steam mass flow rate was delayed.In general

entrainment ratio decreased with the increase of discharge pressure

and its rate of decrease changed at different ranges of discharge pressure.