甲烷-液氧超临界压力非预混湍流燃烧的数值模拟

doi:10.7527/S1000-6893.2015.0279

Abstract

Abstract:

A numerical model has been developed for studying non-premixed turbulent combustion at supercritical pressures. The model is based on the Reynolds-averaged Navier Stokes (RANS) equations and the flamelet-progress variable turbulent combustion treatment, and it accommodates accurate calculations of thermophysical properties and a detailed chemical reaction mechanism. It is applied to conduct numerical studies of the coaxial injection and non-premixed turbulent combustion of CH₄-LO_x at supercritical pressures. The effects of supercritical pressures (6 to 15 MPa) on the combustion processes are examined at different propellant mixture ratios (1 and 3). Results reveal that the effects of pressure on the flame temperature and structure change remarkably at different mixture ratios. At a propellant mixture ratio of 1, the flame length and flame temperature both increase as pressure increases, while at a mixture ratio of 3, the flame length decreases as pressure increases. At a supercritical pressure, the turbulent flame exhibits a sudden expansion in the radial direction (particularly at 6 MPa), because of pseudo boiling resulting from the LO_x property anomaly at the pseudo-critical temperature. This phenomenon can also be influenced by the LO_x injection momentum.

Key words: non-premixed flame, turbulent combustion, supercritical pressure, flamelet-progress variable, mixture ratio

CLC Number:

V511⁺.1

WANG Qiuxiao, HUANG Dongxin, MENG Hua. Numerical simulation of CH₄-LO_<i>x non-premixed turbulent combustion at supercritical pressures[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(7): 2132-2143.

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Numerical simulation of CH₄-LO_<i>x non-premixed turbulent combustion at supercritical pressures

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Numerical simulation of CH₄-LO_<i>x non-premixed turbulent combustion at supercritical pressures