前立柱横梁对火箭橇被试品气动特性影响研究

Research on the influence of aerodynamic characteristics of the front column beam on rocket sled test objects

为了确定运行速度800 m/s双轨火箭橇前立柱横梁位置,采用SST湍流模型求解三维定常N-S方程,对5种横梁安装高度的火箭橇进行了仿真,从横梁周围流场、被试品气动特性两方面进行了分析。结果表明:前立柱横梁安装高度对横梁整流来流方向、整流表面最高压力值与位置、被试品与火箭橇相交激波、被试品气动升力、被试品压心系数、被试品表面压力分布均存在影响,并得出了以平均火箭橇运行过程中各爆炸螺栓工作载荷、稳定弹橇分离后被试品飞行姿态为目的的横梁安装高度与被试品质心系数的设计对照表。

In order to determine the position of the front column beam of a dual-track rocket sled at a running speed of 800 m/s, this paper solves a three-dimensional steady N-S equation through SST turbulence model, simulates rocket sleds of five different beam heights, and analyzes the flow field around the beams and aerodynamic characteristics of the test objects. The results show that installation height of the beam has influences on the flow direction of the beam rectifier, the maximum pressure value and position on the rectifier surface, the interaction shock wave between the test objects and the rocket sled, the aerodynamic lift of the test objects, the pressure center coefficient of the test objects, and the surface pressure distribution of the test objects. Besides, the design comparison table between the installation height of the beam and the mass center coefficient of the test objects are obtained for the purpose of the average working load of each explosive bolt during the operation of the rocket sled and the stabilized flying attitude of the test objects after separation of the rocket sled.