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

LI Jiaqi; RUAN Bo; GAO Xiaowei

doi:10.7527/S1000-6893.2020.23708

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2020 , Vol. 41 >Issue 11: 123708 - 123708

DOI: https://doi.org/10.7527/S1000-6893.2020.23708

Fluid Mechanics and Flight Mechanics

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

LI Jiaqi ,
RUAN Bo ,
GAO Xiaowei

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School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China

Received date: 2019-12-04

Revised date: 2019-12-23

Online published: 2020-02-13

Supported by

National Natural Science Foundation of China (11672061); the Fundamental Research Funds for the Central Universities (DUT19LK30)

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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

Cite this article

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 . DOI: 10.7527/S1000-6893.2020.23708

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