Research of Combustion Dynamics on Cryogenic Flow under Supercritical Pressure

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The numerical and experimental studies on the cryogenic flow under the supercritical pressure are performed in order to understand the thermodynamic characteristics and fluid dynamics. The averaged density distributions of the mono-axial nitrogen jet flow under the supercritical pressure using RANS simulations agree well with the experimental data. The preconditioning method including multi-species mass-conservation equations was developed to capture the unsteady feature near the shear layer in the low-speed H2/O2 shear flow. As for LES simulations, the cryogenic nitrogen/nitrogen mixing layers in ideal-gas and transcritical conditions were also simulated. The results show that the effects of the pseudo-critical temperature are small on the turbulent eddy structure. In the experiment for the cryogenic nitrogen jet under the transcritical pressure, the temperature gradient along the symmetric line becomes small near the pseudo-critical temperature.