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为了寻求高性能和更接近工程应用的发动机 ,提出了一种内喷管为轴对称喷管、塞锥为凹面的“瓦”状塞式喷管 ,分析了这种塞式喷管的优缺点 ,并针对一研究模型进行了数值模拟和实验比较。数值模拟采用NND格式求解曲线坐标下的三维平均雷诺的N S方程 ,并用k ε两方程湍流模型封闭方程组 ;实验研究采用酒精和氧气作为推进剂进行了热试车 ;研究模型的内喷管面积比为 3 2 4 ,总膨胀比为 2 2 15 ,设计压力比为 2 2 0。结果显示“瓦”状塞锥改善了塞锥的流场 ,并且当压力比在 16 8～ 2 2 0的范围内变化时 ,其相对理想喷管的喷管效率在 0 90～ 0 96内变化。对发动机设计作进一步改进 ,其性能有望进一步提高
In order to find an engine with high performance and closer to engineering application, a “tile” plug nozzle with an inner nozzle as an axisymmetric nozzle and a tapered plug as a concave surface is proposed. The advantages and disadvantages of the plug nozzle are analyzed , And a numerical simulation and experimental comparison of a research model. The NND format was used to solve the Navier-Stokes equations of Navier-Stokes equations in the three-dimensional mean Renault curve. The equation was closed by the turbulence model of k ε two equations. In the experimental study, hot test was conducted using alcohol and oxygen as the propellant. Is 3 2 4, the total expansion ratio is 2 2 15, and the design pressure ratio is 2 2 0. The results show that the “wedge-like” plug cone improves the flow field of the plug cone, and when the pressure ratio is varied from 16 8 to 220, the nozzle efficiency of the relatively ideal nozzle varies from 0 90 to 0 96 . The engine design for further improvement, its performance is expected to further improve