超临界正癸烷同轴剪切喷注热声振荡数值模拟

doi:10.7527/S1000-6893.2020.23708

Abstract

Abstract: The thermoacoustic oscillations induced by the dramatic change of fluid density resulted from rapid temperature variations during the shear-coaxial injection process at supercritical pressure is numerically simulated. The effects of outlet pressure, high-temperature n-decane flow rate and inlet temperature, low-temperature n-decane injection rate and inlet temperature on the oscillation amplitude and frequency are investigated. The results show that the high-temperature n-decane shrinks drastically in volume when cooled rapidly, and the pressure increases first and then decreases rapidly due to the inertial of surrounding high-temperature n-decane, thus generating thermoacoustic oscillations. The amplitude and frequency of thermoacoustic waves are mainly determined by the thermophysical properties of high-temperature n-decane at different pressures and temperatures: the frequency of thermoacoustic waves increases with the increase of the sound speed of high-temperature n-decane; the amplitude of thermoacoustic waves is determined by the relative pressure coefficient of the high-temperature n-decane and the rate of temperature change.

Key words: supercritical fluids, hydrocarbon fuels, thermoacoustic waves, oscillations analysis, relative pressure coefficients

CLC Number:

V430
V312.1

LI Jiaqi, RUAN Bo, GAO Xiaowei. Numerical simulation of thermoacoustic oscillations during n-decane shear-coaxial injection processes at supercritical pressure[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(11): 123708-123708.

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Numerical simulation of thermoacoustic oscillations during n-decane shear-coaxial injection processes at supercritical pressure

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