Computational Prediction of Acoustic Waves from a Subscale Rocket Motor

Nonomura, Taku; Morizawa, Seiichiro; Obayashi, Shigeru; Fujii, Kozo

doi:10.2322/tastj.12.pe_11

Cited by 6 publications

(2 citation statements)

References 13 publications

(15 reference statements)

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“…Toward the quantitative prediction, we devoted higher resolution LES for the acoustic waves from the rocket plume and showed that the prediction accuracy for the acoustic waves from the subscaled liquid rocket motor is approximately 5 dB. 3) However, the accuracy was still insufficient, because the accuracy of the experiments is approximately 2 dB. An important difference between the flow conditions of actual rocket motors and our previous computation is the inflow condition.…”

Section: Introductionmentioning

confidence: 93%

Computational Analysis of Compressible Gas-Particle-Multiphase Turbulent Mixing Layer in Euler-Euler Formulation

Terakado

Nagata

Nonomura

et al. 2016

AEROSPACE TECHNOLOGY JAPAN

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Effects of solid particles in the gas-particle multiphase compressible turbulent mixing layer were investigated by direct numerical simulation, compared with the single phase turbulent mixing layer of which the net density ratio (sum of gas and particle densities) was set to be the same as the multiphase case. Here, the situation of solid rocket motor was considered, so that the Mach number and the density (temperature) ratio were set to be high and far from unity, respectively, and the solid particles were distributed only in one side of the mixing layer for the initial condition. Three-dimensional compressible gas-particle-multiphase Navier-Stokes equations in the Euler-Euler formulation were solved with an alternative weighted essentially non-oscillatory scheme with a positivity preserving limiter of the particle density for the multiphase flow computation. It was found that the existence of solid particles leads to the sparse structures of turbulence and suppresses the fine scale turbulent structures, especially for the JET side, which corresponds to the side where particles were initially distributed and the gas density was low. The growth rate of the mixing layer thickness for multiphase flow became smaller due to the change in flow. The change in flow structures also affected the properties of acoustic waves. The Mach wave like structures do not appear for the initially particle existing side for the multiphase flow due to the suppression of fine scale turbulent structures, compared with single phase flow.

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Section: Introductionmentioning

confidence: 93%

Computational Analysis of Compressible Gas-Particle-Multiphase Turbulent Mixing Layer in Euler-Euler Formulation

Terakado

Nagata

Nonomura

et al. 2016

AEROSPACE TECHNOLOGY JAPAN

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“…We have been conducting series of analyses on the acoustic waves from rocket plumes, [1][2][3] in which the mixing is a key phenomenon. In the case of rocket plume, we would like to quantify the effects of multicomponent gas compared with the single gas phenomena, by using numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

A Finite Difference WENO Scheme Maintaining Velocity, Pressure and Temperature Equilibrium in Multicomponent Compressible Fluid Analysis

Nonomura

Terakado

Fujii³

2015

22nd AIAA Computational Fluid Dynamics Conference

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In this paper, the implementation of the finite difference WENO scheme maintaining velocity, pressure and temperature equilibrium in the multicomponent compressible fluid analysis is discussed. First, the new finite difference WENO scheme is proposed for the quasi-conservative form which is often used in the finite volume formulation in the previous study. This new WENO scheme adopts the split form which separates the consistent and dissipation parts, and the dissipation part is formulated in a conservative form, keeping the conservation for conservative variables. The proposed scheme can keep the velocity, pressure and temperature equilibriums for the various problems. Based on the results here and previous studies, the vector form of numerical dissipation is reconsidered.

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