Fabrication of an experimental setup to study the flow of convergent-divergent nozzle
Mohammad Salman*, Saurabh Dixit
Nozzle is a flow passage of varying cross sectional area. It is the most important and basic piece of engineeringhardware associatedwithpropulsionand the highspeed flowof gases. Thisisintended to visualize the flow through this type of nozzle at a range of conditions. The usual configuration for a converging diverging (CD) nozzle is shown. Gas flows through the nozzle from a region of high pressure (usually referred to asthe chamber) to one of low pressure (referred to as the ambient). The chamber is usually big enough so that any flowvelocities here are negligible. The pressure here is denoted by the symbol P. Gas flows from the chamber into the converging portion of the nozzle, past the throat, through the diverging portion and then exhausts into the ambient as a jet. The ambient pressure at different cross sectional position of the nozzle is referred asthe ‘back pressure’ and given the symbol Pb . An experimental setup is designed to measure the Pb for a fixed value of P and a plot between the axial length versus pressure ratio is plotted which shows the flow behaviour at different chamber pressures. The axial lengthistakenfrom the nozzle throat.Bourdonpressure gauges are used to measure the pressure the bourdon gauges are stationary and the nozzle is moving axially with the help of rotating spindle attached to it.
Cylindrical flowpassage, Back pressure,
Khan, A. A. ; Shembharkar, T. R., (2008) ,”Viscous flow analysis in a convergent-divergent nozzle”, Proceedings of the International Conference on Aerospace Science and Technology 26 - 28 June 2008, Bangalore, India,.
Patrick H. O. ; William E. C. (1997), “Compressible Fluid Flow”, The Mcgraw-Hill companies, INC..
Kreith, F.; Berger, S.A.; et. al. (1999) , “Fluid Mechanics”, Handbook,Ed. FrankKreithBocaRaton:CRCPressLLC,.
Krause, E ; Aachen, R, (2005) “Fluid mechanics with problems and solutions and an aerodynamic laboratory “ Aerodynamics Institute, Germany ,ISBN 3-540-22981-7 Springer Berlin Heidelberg New York.
Ekanayake, E. M. S. ; Gear, J. A. Y. Ding (2010) , “ Flow simulation of a two dimensional rectangular supersonic convergent divergent nozzle” ANZIAM J. 51n (EMAC2009) PP.C377-C392,.
Kirk, D. R., “Gas Turbine Engine Nozzles” mae 4261: airbreathing engines Mechanical andAerospace Engineering Department Florida Institute of Technology.
Nicholas J. Georgiadis, Teryn W. DalBello , Charles J. Trefny , andAlbert L.Johns, (2006) “AerodynamicDesign and Analysis of High Performance Nozzles for Mach 4 Accelerator Vehicles “ T44th AIAA Aerospace Sciences Meeting and Exhibit 9 - 12 January, 2006 Reno, Nevada