红外与激光工程
紅外與激光工程
홍외여격광공정
INFRARED AND LASER ENGINEERING
2013年
9期
2403-2408
,共6页
陈豪%石磊%马丽华%彭志明%徐志燕%乔忆炜
陳豪%石磊%馬麗華%彭誌明%徐誌燕%喬憶煒
진호%석뢰%마려화%팽지명%서지연%교억위
激光推进%纳秒激光%脉冲数目%脉冲重复频率%平均冲量耦合系数
激光推進%納秒激光%脈遲數目%脈遲重複頻率%平均遲量耦閤繫數
격광추진%납초격광%맥충수목%맥충중복빈솔%평균충량우합계수
laser propulsion%nanosecond laser%pulse number%pulse repetition frequency%average impulse coupling coefficient
以抛物形点聚焦激光推进器模型为研究对象,数值模拟了脉冲重复频率在2~50Hz范围内吸气式多脉冲纳秒激光推进的流场演变过程,分析了脉冲数目和重复频率对推进性能的影响。结果表明:随着脉冲数目的增加,喷管内气体密度减小、温度升高,导致平均冲量耦合系数下降,但纳秒脉冲激光作用获得的平均冲量耦合系数明显高于微秒脉冲激光;相同脉冲数目条件下,随着脉冲重复频率的增大,流场恢复时间缩短,使得流场状态不能及时恢复,导致平均冲量耦合系数下降,其中脉冲重复频率f≥10 Hz时的下降趋势明显大于f≤10 Hz。
以拋物形點聚焦激光推進器模型為研究對象,數值模擬瞭脈遲重複頻率在2~50Hz範圍內吸氣式多脈遲納秒激光推進的流場縯變過程,分析瞭脈遲數目和重複頻率對推進性能的影響。結果錶明:隨著脈遲數目的增加,噴管內氣體密度減小、溫度升高,導緻平均遲量耦閤繫數下降,但納秒脈遲激光作用穫得的平均遲量耦閤繫數明顯高于微秒脈遲激光;相同脈遲數目條件下,隨著脈遲重複頻率的增大,流場恢複時間縮短,使得流場狀態不能及時恢複,導緻平均遲量耦閤繫數下降,其中脈遲重複頻率f≥10 Hz時的下降趨勢明顯大于f≤10 Hz。
이포물형점취초격광추진기모형위연구대상,수치모의료맥충중복빈솔재2~50Hz범위내흡기식다맥충납초격광추진적류장연변과정,분석료맥충수목화중복빈솔대추진성능적영향。결과표명:수착맥충수목적증가,분관내기체밀도감소、온도승고,도치평균충량우합계수하강,단납초맥충격광작용획득적평균충량우합계수명현고우미초맥충격광;상동맥충수목조건하,수착맥충중복빈솔적증대,류장회복시간축단,사득류장상태불능급시회복,도치평균충량우합계수하강,기중맥충중복빈솔f≥10 Hz시적하강추세명현대우f≤10 Hz。
The parabolic point focusing thruster model was adopted as research object. The development process of flow field of air-breathing nanosecond laser propulsion with pulse repetition frequency of 2-50 Hz was numerically simulated, and the Effect of nanosecond laser pulse number and pulse repetition frequency on performance of laser propulsion was analyzed. The results indicate that with the increase of pulse number, the average impulse coupling coefficient decreased due to the reducing air density and increasing temperature. The average impulse coupling coefficient with nanosecond laser is significantly higher than that with microsecond laser, though. With the same pulse number, when the pulse repetition frequency increased, the flow field had less time to recover, leading to the decreasing average impulse coupling coefficient, and the decreasing trend is much more clear in pulse repetition frequency of f≥10 Hz than in f≤10 Hz.