摘要
为了解结构参数对圆转矩形内喷管再生冷却换热的影响,设计了多个圆转矩形喷管,考虑了三种结构参数:转方位置、出口高宽比和出口圆角大小的影响。采用有限体积法求解三维可压缩的N-S方程对其内部流动和换热进行了数值模拟。湍流模型采用标准的k-ε双方程模型,壁面附近的流动和传热采用壁面函数法处理,速度与压力的耦合采用SIMPLE算法求解。结果表明:在型面一阶导数连续的情况下,转方位置对圆转矩形内喷管的换热影响不大;出口高宽比对圆转矩形内喷管的换热影响较大,出口高宽比不能太小,否则影响内喷管流场和换热;出口圆角大小影响内喷管周向上的温度分布,圆角太小造成周向温度分布不均匀。
To understand influence of structure parameters on heat transfer in round to rectangular nozzle( R R 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.
出处
《推进技术》
EI
CAS
CSCD
北大核心
2005年第6期489-494,共6页
Journal of Propulsion Technology
基金
国家"八六三"项目资助(863-2-3-4-10)
高等学校博士学科点专项科研基金资助课题(2000000619)
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
Liquid propellant rocket engine
Plug nozzles
Internal nozzle ^+
Regenerative cooling
Numerical simulation