Linear-Plug Flowfield and Base Pressure Development in Freestream Flow

Verma, Shashi B.; Viji, M.

doi:10.2514/1.b34195

Cited by 16 publications

(3 citation statements)

References 18 publications

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“…Similar to NPR=3, the case with NPR=6 also exhibits a dominant peak at 3.85 kHz. Similar observations were also reported in the earlier research works on plug nozzles 18,19 , where they observed dominant frequency at 3.36 kHz for NPR≈11 and at 3.8 kHz at NPR≈9. These high frequencies are attributed to the overall unsteadiness on the plug surface, and it is reported that the entire flow was fluctuating at this single frequency.…”

Section: Power Spectrasupporting

confidence: 91%

“…Irrespective of the lateral confinement, a prominent peak of equivalent power is observed at 0.85 kHz for NPR=6. Earlier works on the plug nozzle also reported a similar peak at the same frequency and have associated it with the overexpansion shock 18,19 .…”

Section: Power Spectrasupporting

confidence: 54%

“…Other researchers 16,17 report similar effects on the thrust performance due to side-wall in a linear plug nozzle. Verma and Viji 18 assessed the effect of the side-wall and free stream flow on the base pressure measurement for 40% truncated contoured and conical plug nozzle. The com-plex interaction of over-expansion and recompression shocks on the plug surface causes flow unsteadiness.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the fluidic behavior of an over-expanded planar plug nozzle under lateral confinement

Chaudhary¹,

Krishna²,

Nanda³

et al. 2020

Preprint

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The present work aims to study the fluidic behavior on lateral confinement by placing side-walls on the planar plug nozzle through experiments. The study involves two cases of nozzle pressure ratio (NPR=3, 6), which correspond to over-expanded nozzle operating conditions. Steady-state pressure measurements, together with schlieren and surface oil flow visualization, reveal the presence of over-expansion shock and subsequent interaction and modification of the flow field on the plug surface. The flow remains attached to the plug surface for NPR=3; whereas, for NPR=6, a separated flow field with a recirculation bubble is observed. Spectral analysis of the unsteady pressure signals illustrates a clear difference between the attached and the separated flow. Besides, other flow features with a distinct temporal mode associated with and without lateral confinement are observed. The absence of lateral confinement reduces the intensity of low-frequency unsteadiness; however, on the contrary, the interaction region is relatively reduced under lateral confinement.

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Section: Power Spectrasupporting

confidence: 91%

Section: Power Spectrasupporting

confidence: 54%