This medium is called ''the motive medium''. Through the motive connection (the nozzle), a pressurized liquid, steam or gas is supplied. This implies that there are no moving parts and that the medium is displaced by means of pressurized fluids, -steam or compressed air combined with the internal geometry of the component.Ī Venturi Fluid Jet consists of three components: the nozzle, the body and the diffuser. Messing Dampfstrahlverdichter als Waermepumpen Chem-Ing.-Techn 30 Jahrg.Venturi Fluid Jets (or ejectors) are components that operate on the ejection principle. Hans Peter Schlag Experimentelle und theoretische Untersuchungen zur Berechnung der Kennlinien von gasbetriebenen Einphaseninjektoren und Gutaufgabe Injektoren VDI Verlag 1993 Reihe 3: Verfahrenstechnik Nr 313 2 Uwe Wagenknecht Untersuchun der Stroemungsverhaeltnisse und des Druckverlaufes in Gas/Feststoff-Injektoren Dissertation UB/TIB Hannover 105 585 165 3.Werner Hutt Untersuchun der Stroemungsvorgaenge und Ermittlung von Kennlinien an Gutaufgabe Injektoren zur pneumatischen Foerderung Dissertation Universitaet Stuttgart RA 4212(84) 1983 UB/TIB Hannover 118 842 161 4. This list of references was sent to me by Matija Gregorka. Rmw RE: Steam ejector design (Chemical) 22 Dec 08 17:39.

Over the years they have done enough tests that they can exptrapolate from those that they have tested so they rarely have to verify by testing these days, but they have the labs and test stands to do so if needs be. If it works as designed, then they produce curves and that becomes the performance standard for that particular design.Ĭhange something and they have to do the process all over again. Speaking for my experience with at least one of them, they calculate a design and then make one and test it. There is a lot of an emperical component to vacuum jet design and manufacturing. R114 decreases for off design operation and increases for the two stage ejectors. Measure and calculate ejector entrainment ratio as a function of boiler, condenser and evaporator temperatures. Motive stream and reduce jet mixing losses shock wave formation losses. To validate the CFD simulation, the numerical predictions.

(CFD) software, was used to model gas ejectors. Gas Ejector Modeling for Design and Analysis. We can use the Spirax Sarco Online Sizing Software to design a suitable unit (available. Will be, we need to calculate the 'Compression ratio'. An SJT Steam Jet Thermocompressor is a type of Ejector that uses high pressure (HP) steam to entrain low pressure water vapour.

Ejector design calculation software