IIUM Repository

Modeling and analysis of convergent divergent nozzle with sudden expansion duct using finite element method

Aabid, Abdul and Chaudhary, Zakir Ilahi and Khan, Sher Afghan (2019) Modeling and analysis of convergent divergent nozzle with sudden expansion duct using finite element method. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 63 (1). pp. 34-51. ISSN 2289-7879 E-ISSN 2289-7879

[img]
Preview
PDF
Download (2MB) | Preview

Abstract

n most of the engineering problems, the sudden expansion at the base is encountered in automobile industries, at the base of the fuselage of the aircraft, at the base of the artillery shells, at the base of the unguided rockets and missiles. At transonic Mach numbers, the contribution of the base drag is more than sixty percent. Hence it is mandatory on the part of the researcher to control the base pressure, depending upon the situation. For external aerodynamics, the base pressure should be closed to the ambient pressure to make base drag almost zero. However, for combustion chambers, the base pressure should be very low so that fuel-air mixing is so that the combustor is efficient. With this idea in mind, this study was undertaken. A finite element (FE) the method has been used to investigate the effectiveness of the microjets on wall pressure distribution in a convergent-divergent (CD) nozzle with sudden expansion. For control of the base pressure, four microjets of 1 mm orifice diameter placed at 90- degree intervals along a pitch circle distance (PCD) of 1.3 in the base region were used as a control mechanism. The variables considered are the Mach number, area ratio, and length-to-diameter ratio (L/D) as 2.2, 2.56, and 8. The simulation was done for nozzle pressure ratio (NPR) 3, 5, 7, 9, and 11 with and without the presence of the microjets. The current results for all the cases of this study indicate that one can identify the Mach number, NPR, and the L/D, which will result in a maximum increase in the pressure. Moreover, the results also proved that the influence of microjet control does not affect the flow field in the duct adversely. The two-dimensional planar CD nozzle with sudden expansion duct has been modeled, and analyses using the K-ε turbulence model independently checked with the ANSYS tool.

Item Type: Article (Journal)
Additional Information: 7395/76171
Uncontrolled Keywords: Wall Pressure; Base Pressure; Mach number; L/D ratio; NPR
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL1 Motor vehicles
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Mechanical Engineering
Kulliyyah of Engineering
Depositing User: Prof. Dr. Sher Afghan Khan
Date Deposited: 13 Nov 2019 16:05
Last Modified: 13 Nov 2019 16:05
URI: http://irep.iium.edu.my/id/eprint/76171

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year