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Experimental Investigation of Nozzle Exit Reflector Effect on Supersonic Jet

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Abstract

The present study describes an experimental work to investigate the effect of a nozzle exit reflector on a supersonic jet that is discharged from a convergent–divergent nozzle with a design Mach number of 2.0. An annular reflector is installed at the nozzle exit and its diameter is varied. A high-quality spark schlieren optical system is used to visualize detailed jet structures with and without the reflector. Impact pressure measurement using a pitot probe is also carried out to quantify the reflector’s effect on the supersonic jet which is in the range from an over-expanded to a moderately under-expanded state. The results obtained show that for over-expanded jets, the reflector substantially increases the jet spreading rate and reduces the supersonic length of the jet, compared with moderately under-expanded jets. The reflector’s effect appears more significant in imperfectly expanded jets that have strong shock cell structures, but is negligible in correctly expanded jet.

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Abbreviations

D :

nozzle exit diameter

D i :

inner diameter of annular reflector

D o :

outer diameter of annular reflector

D t :

nozzle throat diameter

L :

length

M :

Mach number

p :

pressure

p i :

impact pressure

r :

radial distance from the nozzle axis

t :

reflector size

t b :

reflector width

T :

temperature

x :

distance along the jet axis from nozzle exit

γ:

ratio of specific heats

δ:

jet boundary layer half-width

φ:

phase angle

0:

stagnation state in the plenum chamber

a:

ambient state

c:

potential core

d:

design condition at the nozzle exit

j:

fully expanded condition

s:

supersonic

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Authors and Affiliations

  1. Department of Energy and Environmental Engineering, Kyushu University, 6-1, Kasuga Kouen, Kasuga, Fukuoka, 816-8580, Japan

    Y.-H. Kweon, Y. Miyazato & T. Aoki

  2. School of Mechanical Engineering, Andong National University, 388, Songchun-dong, Andong, 760-749, Korea

    H.-D. Kim

  3. Department of Mechanical Engineering, Saga University, 1, Honjo, Saga, 840-8502, Japan

    T. Setoguchi

Authors
  1. Y.-H. Kweon
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  2. Y. Miyazato
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  3. T. Aoki
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  4. H.-D. Kim
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  5. T. Setoguchi
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Corresponding author

Correspondence to Y.-H. Kweon.

Additional information

Communicated by K. Takayama

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Kweon, YH., Miyazato, Y., Aoki, T. et al. Experimental Investigation of Nozzle Exit Reflector Effect on Supersonic Jet. Shock Waves 15, 229–239 (2006). https://doi.org/10.1007/s00193-006-0021-6

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  • DOI: https://doi.org/10.1007/s00193-006-0021-6

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