Modelling and analysis of convergent divergent nozzle with sudden expansion duct using finite element method
In 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 bas...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English English |
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Penerbit Akademia Baru
2019
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| Online Access: | http://irep.iium.edu.my/79718/1/79718_Modelling%20and%20analysis%20of%20convergent.pdf http://irep.iium.edu.my/79718/2/79718_Modelling%20and%20analysis%20of%20convergent_SCOPUS.pdf http://irep.iium.edu.my/79718/ http://www.akademiabaru.com/doc/ARFMTSV63_N1_P34_51.pdf |
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| Institution: | Universiti Islam Antarabangsa Malaysia |
| Language: | English English |
| Summary: | In 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)
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 modelled, and analyses using the K-ε
turbulence model independently checked with the ANSYS tool. |
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