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Numerical simulation of CH4-LO<i>x non-premixed turbulent combustion at supercritical pressures
Received date: 2015-07-08
Revised date: 2015-10-15
Online published: 2015-10-30
Supported by
National Natural Science Foundation of China (11372277)
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-LOx 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 LOx property anomaly at the pseudo-critical temperature. This phenomenon can also be influenced by the LOx injection momentum.
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 . DOI: 10.7527/S1000-6893.2015.0279
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