Fluid　flow　in　steam　jet　ejector　was　simulated　by　employing　wet　steam　model　for　transonic　flow.　The　study　focused　on　fluid　flow　in　mixing　chamber　of　steam　jet　ejector　and　compared　difference　in　simulation　results　between　ideal　gas　and　wet　steam　models.　Higher　entrainment　ratio　of　steam　jet　ejector,　smaller　localized　high　pressure　produced　by　shock　waves　near　nozzle　outlet　and　ejector　inlet,　and　less　reduction　in　velocity　and　temperature　of　primary　steam　were　observed　in　wet　steam　model　than　in　ideal　gas　model.　©　All　Right　Reserved.