ANALISIS PENGARUH TEKANAN MOTIVE FLUID TERHADAP ENTRAIMENT RATIO EJEKTOR UDARA-UDARA MENGGUNAKAN CFD

FAHMI, EZIEF MUHAMMAD and Vidian, Fajri (2016) ANALISIS PENGARUH TEKANAN MOTIVE FLUID TERHADAP ENTRAIMENT RATIO EJEKTOR UDARA-UDARA MENGGUNAKAN CFD. Undergraduate thesis, Sriwijaya university.

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Abstract

The conslraini of ejector is the efficiency which is very low. This low efficiency is influenced by en/rainment ratio. Entrainment Ratio is strongly injluenced by the system, the shape of geometty and operating condilions. Therefore, before doing the testing or manufacturing equipments, it is necessary to do the prediction of phenomenon which occurs in the ejector jlow first by using a Software, in order to get the concept of the number of secondaryflow which can be drawn by the ejector with predetermined geometry dimension. Thus in helping the efforl to minimize the errors of design, to save the costs and to improve the performance of ejector so it will be more optimal The purpose of this study is to assess the ejfect of pressure change to entraiment ratio on air ejector by using CFD and to analyze the visualization through flow simulation on ejector. Ejector dimension was taken from liter atur e study of Kroll 1947 if knowing the throat diameter then other paris of dimension can be known. From the analysis explained that each operational condition with dijferent inlent pressure has its own CBP value. Therefore, the higher motive fluid pressure, the lower critical back pressure (CBP). The influence of entraiment ratio t o back pressure thus entraiment ratio downed because of reverse flow on cerlain back pressure which resulted afewflow of motive fluid flows back through nozzle. When the discharge pressure is on the point of entraiment ralio downed, it causes the secondary fluid weakened so entraiment ratio approximated the value of 0. From the result of simulation showed that the higher pressure on ejector fluid motive, the higher rate ofmass Jlow secondary fluid. It also affects on entraiment ratio of ejector. The higher pressure motive fluid, the higher entraiment ratio of ejector. The velocity in ejector is influenced by the variations of molive Jluid pressure. On ihe motive fluid pressure of 6000 Pa seen that the flow ve/ocity on nozzle throat has increased to 87.0868 m/s, on the molive Jluid pressure 4000 Pa the Jlow velocily on nozzle throat has increased t o 69.3087 m/s whereas on 2000 P a the velocity on nozzle throat only 47.4614 m/s, it indicales that the higher molive Jluid pressure, the faster Jlow of nozzle output thus the number of secondary flow that can be drctwn even greater. Seen that, reverse Jlow occurs when the amalgamation between motive Jluid and secondary fluid. The higher motive Jluid pressure, the greater reverse Jlow occurs when the amalgamation thus blockage occurs on Jlow ofmbcture. The phenomenon of chocked occurs loo where the stcitic pressure on the position of certain ejector throat will down the stalic pressure then the staticpressure will up gradually in the part of ejector diffuser. Keywords: Ejector, Entraiment Ralio, Molive Fluid, Critical Back Pressure, Secondary Fluid, Reverse Flow, Chocked, Blockage, Diffuser, Nozzle. Citation: 31 (1942 - 2015)

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Ejektor, Enlraimenl Ratio, Molive Fluid, Critical Back Pressure Secondary
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ1040-1119 Machinery exclusive of prime movers > TJ1073.5.B38 Fluid-film bearings.
Divisions:	03-Faculty of Engineering > 21201-Mechanical Engineering (S1)
Depositing User:	Ichlasyah Aisyah
Date Deposited:	09 Sep 2025 02:34
Last Modified:	09 Sep 2025 02:34
URI:	http://repository.unsri.ac.id/id/eprint/183743

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