带延长圆柱形喷管激光推力器推进性能数值研究  

Numerical study on propulsion performance of laser thruster with elongate cylindrical nozzle

作　　者：程富强 窦志国 李倩 

机构地区：[1]装备学院研究生管理大队,北京101416 [2]装备学院基础部,北京101416

出　　处：《强激光与粒子束》2011年第9期2341-2345,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(90916015)

摘　　要：针对抛物形喷管与圆柱形喷管相组合的带延长圆柱形喷管激光推力器模型,通过求解含激光能量源项的流体力学方程组,计算得到了不同单脉冲激光能量条件下3种构形参数对冲量耦合系数和推力的影响。结果显示带延长圆柱形喷管可获得高于600N/MW的冲量耦合系数,同时表明冲量耦合系数随圆柱喷管长度的增加而增大并趋于饱和,圆柱喷管饱和长度与激光能量呈线性关系。冲量耦合系数随抛物形喷管张角的增大先增大后减小,对于总长度为100mm的喷管,半张角在33°左右时取得最大值且受激光能量的影响很小。冲量耦合系数随点火位置的增大也存在最大值,最大值对应的点火位置与激光能量成线性关系。Laser thrusters with single nozzle of parabolic or conic profile fail to constrict the high-pressured flow efficiently,resulting in poor propulsion performance.Under air-breathing mode and different single-pulse laser energy,the laser thruster with elongate cylindrical nozzle which features a parabolic nozzle tailed by a cylindrical nozzle is studied numerically for different shape parameters by building physical computation model.Readily,its impulse coupling coefficient is tested to be more than 600 N/MW with a good accordance with the foreign experiments.Meanwhile,the results show that,the impulse coupling coefficient increases along with cylindrical nozzle length and approaches a constant value,and the proposed cylindrical nozzle saturation length increases linearly with laser energy;the impulse coupling coefficient increases initially but then descends as the parabolic expanding-angle increases,and the half-expanding angles corresponding to the peak stay around 33° with little variation when laser energy differs for the total nozzle length of 100 mm;as the ignition position moves farther away,the impulse coupling coefficient also reaches a peak-corresponding,and the peak ignition position shows a linear relation with laser energy.

关 键 词：激光推进 吸气式 单脉冲 抛物-圆柱组合喷管 冲量耦合系数 

分 类 号：V439[航空宇航科学与技术—航空宇航推进理论与工程] TN249[电子电信—物理电子学]