These ratios are computer calculated and are the key parameters in ejector design.Įjectors use steam to generate vacuum and can be single or multi-stage: If Ws kg/hr motive steam are required to entrain and compress Wl kg / hr of load vapours, we define the entrainment ratio for this ejector as Wl/Ws. We define the compression ration for this ejector as P2/P1. The load gases have been compressed from their original pressure P1 to a new pressure, P2. ![]() Upon leaving the throat, the gases slow down and regain pressure to a pressure P2. the low pressure, high velocity steam from the nozzle, together with the slower, entrained load vapours, will mix as they converge into the throat of the ejector. The low pressure induces a flow of load vapours at a pressure (P1) into the ejector. ![]() ![]() Steam at pressure Pi expands through a nozzle and exits at very low pressure (Px) and at very high velocity.
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