Improved noise predictions from subsonic jets at Mach 0.75 using URANS calculations

Tide, P. S.; Babu, V.

doi:10.1504/pcfd.2009.027764

Cited by 2 publications

(6 citation statements)

References 28 publications

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“…Usually, skewness measure values below 0.8 are acceptable. A similar domain and grid was used by Tide and Babu (2009a, 2009b) for their calculations of flow characteristics of jets emanating from chevron nozzles.…”

Section: Problem Description and Solution Methodologymentioning

confidence: 99%

“…They concluded that URANS calculations can predict the sound pressure level within ±4 dB of that of experimental value. The approach followed by Tide and Babu (2009a) and Tide and Babu (2009b) for evaluating the jet from chevron nozzle was used in this paper to find the flow characteristics of jet emanating from corrugated lobed nozzle.…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that URANS calculations can predict the sound pressure level within 64 dB of that of experimental value. The approach followed by Tide and Babu (2009a) and Tide and Babu (2009b) for evaluating the jet from chevron nozzle was used in this paper to find the flow characteristics of jet emanating from corrugated lobed nozzle. Munday et al (2009) used shadowgraph, particle image velocimetry, far-field and near-field acoustic surveys to get flow structure and acoustics of supersonic jets from conical convergent-divergent (CD) nozzles.…”

Section: Introductionmentioning

confidence: 99%

“…Out of all geometries investigated, eight lobed and 0° penetration angle gave the maximum level of noise suppression. Tide and Babu (2009b) conducted improved noise prediction using URANS calculations at 0.75 Mach number. They concluded that URANS calculations can predict the sound pressure level within ±4 dB of that of experimental value.…”

Section: Introductionmentioning

confidence: 99%

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Numerical predictions of the flow characteristics of subsonic jet emanating from corrugated lobed nozzle

Paul

Kriparaj

Tide

2020

AEAT

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Purpose The purpose of this study is to investigate the aerodynamic characteristics of subsonic jet emanating from corrugated lobed nozzle. Design/methodology/approach Numerical simulations of subsonic turbulent jets from corrugated lobed nozzles using shear stress transport k-ω turbulence model have been carried out. The analysis was carried out by varying parameters such as lobe length, lobe penetration and lobe count at a Mach number of 0.75. The numerical predictions of axial and radial variation of the mean axial velocity, u′u′ ¯ and v′v′ ¯ have been compared with experimental results of conventional round and chevron nozzles reported in the literature. Findings The centreline velocity at the exit of the corrugated lobed nozzle was found to be lower than the velocity at the outer edges of the nozzle. The predicted potential core length is lesser than the experimental results of the conventional round nozzle and hence the decay in centreline velocity is faster. The centreline velocity increases with the increase in lobe length and becomes more uniform at the exit. The potential core length increases with the increase in lobe count and decreases with the increase in lobe penetration. The turbulent kinetic energy region is narrower with early appearance of a stronger peak for higher lobe penetration. The centreline velocity degrades much faster in the corrugated nozzle than the chevron nozzle and the peak value of Reynolds stress appears in the vicinity of the nozzle exit. Practical implications The corrugated lobed nozzles are used for enhancing mixing without the thrust penalty inducing better acoustic benefits. Originality/value The prominent features of the corrugated lobed nozzle were obtained from the extensive study of variation of flow characteristics for different lobe parameters after making comparison with round and chevron nozzle, which paved the way to the utilization of these nozzles for various applications.

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Section: Problem Description and Solution Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical predictions of the flow characteristics of subsonic jet emanating from corrugated lobed nozzle

Paul

Kriparaj

Tide

2020

AEAT

View full text Add to dashboard Cite

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“…The prediction of jet noise requires vast information on the mean flow and turbulent characteristics of jets emanating from nozzles. Tide and Babu (2009) accurately predicted mean and fluctuating quantities for round jets with RANS calculations with moderately less computational resources. Balabel et al (2011) have carried out a 2D numerical simulation of experiments conducted by Hunter (1998) and reported that the shear stress transport k-v model showed the best agreement with the experimental data.…”

Section: Introductionmentioning

confidence: 91%

Design of a double parabolic supersonic nozzle and performance evaluation by experimental and numerical methods

Mubarak

Tide

2018

AEAT

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Purpose The purpose of this paper is to design a double parabolic nozzle and to compare the performance with conventional nozzle designs. Design/methodology/approach The throat diameter and divergent length for Conical, Bell and Double Parabolic nozzles were kept same for the sake of comparison. The double parabolic nozzle has been designed in such a way that the maximum slope of the divergent curve is taken as one-third of the Prandtl Meyer (PM) angle. The studies were carried out at Nozzle Pressure Ratio (NPR) of 5 and also at design conditions (NPR = 3.7). Experimental measurements were carried out for all the three nozzle configurations and the performance parameters compared. Numerical simulations were also carried out in a two-dimensional computational domain incorporating density-based solver with RANS equations and SST k-ω turbulence model. Findings The numerical predictions were found to be in reasonable agreement with the measured experimental values. An enhancement in thrust was observed for double parabolic nozzle when compared with that of conical and bell nozzles. Research limitations/implications Even though the present numerical simulations were capable of predicting shock cell parameters reasonably well, shock oscillations were not captured. Practical implications The double parabolic nozzle design has enormous practical importance as a small increase in thrust can result in a significant gain in pay load. Social implications The thrust developed by the double parabolic nozzle is seen to be on the higher side than that of conventional nozzles with better fuel economy. Originality/value The overall performance of the double parabolic nozzle is better than conical and bell nozzles for the same throat diameter and length.

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Improved noise predictions from subsonic jets at Mach 0.75 using URANS calculations

Cited by 2 publications

References 28 publications

Numerical predictions of the flow characteristics of subsonic jet emanating from corrugated lobed nozzle

Numerical predictions of the flow characteristics of subsonic jet emanating from corrugated lobed nozzle

Design of a double parabolic supersonic nozzle and performance evaluation by experimental and numerical methods

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