Analytical and Experimental Methods of Design for Supersonic Two-Stage Ejectors

Authors: S. Daneshmand, C. Aghanajafi, A. Bahrami

Abstract:

In this paper the supersonic ejectors are experimentally and analytically studied. Ejector is a device that uses the energy of a fluid to move another fluid. This device works like a vacuum pump without usage of piston, rotor or any other moving component. An ejector contains an active nozzle, a passive nozzle, a mixing chamber and a diffuser. Since the fluid viscosity is large, and the flow is turbulent and three dimensional in the mixing chamber, the numerical methods consume long time and high cost to analyze the flow in ejectors. Therefore this paper presents a simple analytical method that is based on the precise governing equations in fluid mechanics. According to achieved analytical relations, a computer code has been prepared to analyze the flow in different components of the ejector. An experiment has been performed in supersonic regime 1.5

Keywords: Ejector, Wind Tunnel, Supersonic, Diffuser, Machnumber, Mixing Chamber

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1084270

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References:

[1] ESDU, ''Ejector and jet pumps Design and performance for compressible air flow'', Date item No.84029, London, September, 1986.
[2] Cherkassky, V.M. ''Pumps fans compressors'', Moscow, Mir pub, pp 64-373, 1997.
[3] Anderson, J.D. ''Fundamentals of aerodynamics '', Mc Grow-hill book company, 2005.
[4] Abramovich, G.N. ''Fundamentals of gas dynamics'', musco, 1969.
[5] ESDU, 74015, ''Performamance in incompressible flow of plancewalled diffusers with single-plane expansion.
[6] Ascher, H.Sh. ''The dynamics and thermodynamics of compressible fluid flow''.Vol.1, Publisher Wiley, 1953.
[7] Leybold-heraeus gmbh,'' Vacuum technology its foundations formulae and Tables'', Publisher Leybold-Heraeus, 1981.
[8] Beam .R.M.and Warming, R.F,'' An Implicit factored Scheme for the Compressible Flow''AIAA journal, 1978.
[9] William.H.P.and Saul .A.T.''Numerical Recipes in C'', 1992.
[10] Mac Cormack, R.W.''A Numerical method for solving the equations of compressible viscous Flow '', AIAA journal, Vol.1, pp.234- 236.1982.
[11] Keenan, J.H.''A Simple Air Ejector '', Vol.2, pp. A75-A81.1942.
[12] ''Fluent user's manual'', Fluent Inc.1999.
[13] Neve, R.S.''Computational Fluid Dynamics Analysis of Diffuser performance in Gas -powered Jet Pump'', Int.J.Heat and Fluid Flow Vol. 14, No.4, pp. 401-407, Dec. 1993.
[14] ''Ejector performance test codes '', ASME 1976.