关键词: 液体火箭发动机;气动塞式喷管+;内喷管+;再生冷却;数值仿真

Abstract: To understand influence of structure parameters on heat transfer in round to rectangular nozzle(RR nozzle),several RR nozzles were designed.Three parameters were taken into consideration: round to rectangular transforming position,ratio of height to width and arc radius at exit.Three dimensional Navier-Stokes equations were solved with finite volume method.Standard k-ε turbulent model and wall function were used for near wall treatment.The coupling of pressure and velocity were realized with SIMPLE algorithm.Results indicate: under conditions that contour derivative is consecutive,transforming position does not significantly affect heat transfer in RR nozzles;height to width ratio at exit greatly influences heat transfer in RR nozzles and too small ratio would lead to high temperature points on gas side wall;arc radius has an effect on surface temperature of perimeter of gas side wall and too small radius makes circumferential temperature non-uniform.

Key words: Liquid propellant rocket engine;Plug nozzles;Internal nozzle~+;Regenerative cooling;Numerical simulation