Experimental and Computational Exploration of Underexpanded Jets from Conical, Bell and Double Parabolic Nozzles

Mubarak, A K; Tide, P. S.

doi:10.15866/ireme.v12i1.12756

Cited by 2 publications

(2 citation statements)

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“…Mubarak and Tide (2018a) observed an enhanced thrust in a double parabolic nozzle as compared to that of a conical nozzle. Furthermore, Mubarak and Tide (2018b) found that the variations in the shock cell, potential core, and supersonic core lengths of the bell, double parabolic, and conical nozzles were negligible. Callender et al (2010) investigated the effects of serrated chevrons on the jet flow issuing from a coaxial circular nozzle.…”

Section: Introductionmentioning

confidence: 96%

Effect of Lobe Count and Lobe Length of Corrugated Lobed Nozzle on Subsonic Flow Characteristics

Roy

Kriparaj²,

Tide³

et al. 2023

JAFM

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The corrugated lobed nozzle is an emerging research topic in jet flow dynamics, and little investigation has been conducted on its effect on flow characteristics. Thus, in this study, the effects of lobe count and lobe length of corrugated lobed nozzles on subsonic jet characteristics were experimentally investigated by analyzing the velocity profiles of the jets emanating from the nozzles. The Pitot tube readings were obtained by varying the count (4 ≤ N ≤ 8) and length (10 mm ≤ L ≤ 20 mm) of corrugated lobes. These measurements were then compared with the experimental readings obtained for a baseline circular nozzle. The nozzle pressure ratio (NPR) and exit nozzle area were kept identical at 1.5 and 600 mm2, respectively, for all nozzle configurations. The most striking observation was the ‘W’-shaped radial velocity profile of the corrugated nozzle, which differed from the ‘Top hat’ profile of the baseline circular nozzle. Additionally, the length of the potential central region of the corrugated nozzle was always shorter than that of the baseline circular nozzle, indicating the early occurrence of turbulence in the former. It was found that the lobe length had a meagre effect on the velocity variation in the jet issuing from the corrugated nozzle, whereas the lobe count had a significant effect on the velocity profile. However, as the lobe count increased, the velocity profile of the corrugated nozzle gradually resembled that of the circular nozzle. The findings of this study would be beneficial for selecting a proper lobe count and lobe length while designing and implementing a corrugated lobed nozzle.

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Section: Introductionmentioning

confidence: 96%

Effect of Lobe Count and Lobe Length of Corrugated Lobed Nozzle on Subsonic Flow Characteristics

Roy

Kriparaj²,

Tide³

et al. 2023

JAFM

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show abstract

“…The asymmetric chevron nozzle produces a much weaker shock wave and hence does not generate any Mach disk. Mubarak and Tide (2018b) conducted a comparative study on conical, double parabolic and bell nozzles using Schlieren images along the flow field. It was reported that the lengths of shock cells were approximately same for all nozzle configurations and therefore the effect of nozzle contour on under-expanded shock cell development was marginal.…”

Section: Introductionmentioning

confidence: 99%

Schlieren imaging investigation on azimuthally varying shock net from four-lobed corrugated nozzle

K.G.

Paul

P.S.

et al. 2022

AEAT

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Purpose The purpose of this paper is to conduct an experimental investigation on the shock cell structure of jets emanating from a four-lobed corrugated nozzle using Schlieren imaging technique. Design/methodology/approach The Schlieren images were captured for seven different nozzle pressure ratios (NPR = 2, 3, 4, 5, 6, 7 and 8) and compared with the shock cell structure of a round nozzle with an identical exit area. The variation in the length of the shock cell, width of boundary interaction between adjacent shock cells, maximum width of first shock cell, Mach disk position and diameter for different NPR was measured from the Schlieren images and analysed. Findings A three-layer shock net observed in the jet emanating from the four-lobed corrugated nozzle is a novel concept in the field of under-expanded jet flows. A shock net represents interconnected layers of shock cells developed because of the interaction between the core and peripheral shock waves in a jet emanating from a corrugated lobed nozzle. Also, the pattern of shock net is different while taking Schlieren images across the groove and lobe sections. Thus, the shock net emerging from a corrugated lobed nozzle varies azimuthally and primarily depends on the nozzle exit cross section. The length of the shock cell, width of boundary interaction between adjacent shock cells, maximum width of first cell, Mach disk position and diameter were found to exhibit increasing trend with NPR. Originality/value A novel concept of interconnected layers of shock waves defined as “shock net” developed from a single jet emanating from a four-lobed corrugated nozzle was observed.

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Experimental and Computational Exploration of Underexpanded Jets from Conical, Bell and Double Parabolic Nozzles

Cited by 2 publications

References 0 publications

Effect of Lobe Count and Lobe Length of Corrugated Lobed Nozzle on Subsonic Flow Characteristics

Effect of Lobe Count and Lobe Length of Corrugated Lobed Nozzle on Subsonic Flow Characteristics

Schlieren imaging investigation on azimuthally varying shock net from four-lobed corrugated nozzle

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