Coupling Heat Transfer and Fluid Flow Solvers for High Area Ratio Rocket Nozzle

Turbulent flow separation coupling heat transfer with the solid case in the high area ratio rocket nozzle is simulated with the CFD method and the results are investigated experimentally. The finite volume method, the 2nd order upwind scheme, SST k-ω turbulence model and enhanced wall function are employed to solve the N-S equation and thermal conduction equation. To predict the fluid field and wall temperature distribution, numerical models have been developed considering both solid and fluid regions. Solid and fluid regions work together, each one providing a boundary condition for the other, and the solution to the coupled problem has been attained. In the end, flow in a high area ratio rocket nozzle is simulated, separation is indicated, and in the separation zone the temperature gradient is high. The location of the separation point predicted agreed well with the experimental data, which proved the accuracy of the method of numerical simulation.