Linear-Plug Flowfield and Base Pressure Development in Freestream Flow
IR@NAL: CSIR-National Aerospace Laboratories, Bangalore
View Archive Info| Field | Value | |
| Title |
Linear-Plug Flowfield and Base Pressure Development
in Freestream Flow
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| Creator |
Verma, SB
Viji, M |
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| Subject |
Spacecraft Propulsion & Power
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| Description |
An experimental investigation has been carried out to study the linear-plug-nozzle flowfield development with and
without freestream flow. The effect of truncation (40%), plug contour, and side plates on base pressure development
has been also studied. Relative to no freestream condition, the higher outward deflection of the initial portion of the
free-jet boundary in the presence of freestream prevents the overexpansion shock from the upper portion of the inner
nozzle to impinge on the plug surface, modifying the flow development downstream of the overexpansion shock. This
reduces the altitude-adaptive character of the plug nozzle and also influences the base pressure value, which is seen to
decrease with increase in freestream Mach number. The nozzle pressure ratio for base wake closure is also found to
be sensitive to the plug configuration. Contouring the plug significantly enhances the base pressure value, but a
smaller base initiates an early wake closure. The addition of side plates results in an early base wake closure in each
case. The characteristic frequency of base pressure fluctuations is found to be strongly dependent on plug
configuration and base region size.
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| Publisher |
American Institute of Aeronautics and Astronautics
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| Type |
Journal Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://nal-ir.nal.res.in/12001/1/LPN_final_jl_copy_2011.pdf
Verma, SB and Viji, M Linear-Plug Flowfield and Base Pressure Development in Freestream Flow. Journal of Propulsion and Power . ISSN 0748-4658 |
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| Relation |
http://nal-ir.nal.res.in/12001/
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