铝制旋转抛物面型激光推力器温度效应的实验研究  

Experimental Study on Temperature Effect of Aluminium Rotating Parabolic Laser Thruster

作　　者：胡云[1] 蔡建[2] 程建中[1] 张增明[3] 丁泽军[1] 胡晓军[2] 

机构地区：[1]中国科学技术大学物理系 [2]中国科学技术大学力学和机械工程系,中科院材料力学行为和设计重点实验室 [3]中国科学技术大学天文与应用物理系,安徽合肥230026

出　　处：《实验力学》2008年第5期455-462,共8页Journal of Experimental Mechanics

摘　　要：研究了激光推进中铝制旋转抛物面型推力器的温度变化情况。采用脉冲TEA-CO2激光器作为推进光源,用响应较快的K型热电偶丝作为温度传感器,分别在大气呼吸和烧蚀两种工作模式下,研究了抛物面上不同点的温度分布情况,以及脉冲个数和环境气压对抛物面温度的影响。文中对冲量耦合系数和气压的关系也作了研究,并将其与温度联系起来。结果发现在旋转抛物面的顶点处温度为最高,随离顶点距离的增大而减小。在大气呼吸和烧蚀两种模式下,抛物面温度随着激光脉冲个数增加,但增加的斜率逐渐减小,有饱和的趋势。在激光脉冲个数确定的条件下,大气呼吸模式的温度随气压的减小先增大后减小,出现一个峰值;烧蚀模式则随气压的减小而增大。在大气呼吸模式下,冲量耦合系数随着气压的减小先略为增大而后迅速减小,在约0.5atm处出现了一个弱峰;在烧蚀模式下,冲量耦合系数随气压减小迅速升高,在气压低于0.5 atm后,几乎为定值。Temperature effect on aluminium rotating parabolic thruster in laser propulsion was studied experimentally. Using high power pulse TEA-CO2 laser and K type thermocouple, the temperature distribution on a parabolic reflector and the temperature response under different pulse number and atmospheric pressure were investigated in air-breathing and ablation mode, respectively. The relation between Impulse coupling coefficient Cm value and pressure was also studied connected with tempreature. It is found that the temperature distribution has a maximum at the parabola vertex, and decreases along with the distance from the vertex. The temperature increases with the pulse number in both air-breathing and ablation mode. But the slope of rising temperature is decreasing and presents a tendency of reaching a limit. For a certain pulse number, in air-breathing mode, the temperature increases at first then decreases along with the atmospheric pressure decreasing, forming a peak; but in ablation mode, the temperature increases continually with the pressure decreasing. In air-breathing mode, along with the pressure decreasing, the Cm value increases a little at first then decreases sharply after 0.5 atm forming a small peak; while in ablation mode, Cm value increases with pressure and nearly maintains a constant after 0.5 atm.

关 键 词：激光推进 温度 冲量耦合系数 气压 大气呼吸模式 烧蚀模式 

分 类 号：TN249[电子电信—物理电子学] O347.51[理学—固体力学]