喷管构形和聚焦位置对雾化水滴推进性能的影响
Effects of nozzle configuration and laser focusing site on propulsive performances of atomized water droplets
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摘要: 以抛物形和锥形喷管为研究对象，开展了雾化水滴的脉冲式TEA CO2激光推进性能的实验研究。冲量的大小由压电传感器测量得出的推力随时间的变化关系曲线得出。雾化水滴的能量转化效率达到了26.1%，比冲达到了102 s。对于较短的喷管而言，聚焦位置距离喷管顶部越近，推进性能参数越高。喷管构形对推进性能的影响比较明显，抛物形喷管的推进性能优于锥形喷管。Abstract: A TEA CO2 laser was employed to ablate atomized droplets for laser propulsion. Parabolic and conic nozzles were chosen for study. Total impulse was derived from the piezoelectric sensor data. Experimental results indicated that specific impulse and internal efficiency were increased to 102 s and 26.1% respectively. For short nozzles, propulsive characteristics increased as focusing site was moved nearer to the top of nozzles. Propulsive characteristics of parabolic nozzles were better than that of conical nozzles.
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Key words:
- laser propulsion /
- atomized water droplets /
- specific impulse /
- internal efficiency
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