基于粒子图像测速的XeF(C-A)气体激光器增益区流场测量
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摘要
基于粒子图像测速(PIV)技术,测量了闭合循环脉冲XeF(C-A)蓝绿准分子激光器增益区的流场。研究了放电区域内流场中心区、近激光窗口区和过渡区在未放电条件下定常流场的流速特征及放电后不同时刻的流场形态,分析了放电后流场的恢复时间与风机转动频率、放电电压的关系。结果表明:在近窗口区域,存在流速缓慢的涡流;在流场中心区,流速较大且分布均匀;放电后瞬态出现了流速极慢的流场停滞现象。
Particle image velocimetry(PIV) technique is used to measure the flow field in the gain zone of a closed loop pulsed XeF(C-A) blue-green excimer laser. The flow velocity characteristics of the steady flow field in the center of the flow field, near the laser window and between the two parts in the discharge zone are studied. The flow field states in different time during the process of the discharge are analyzed. Furthermore, the relationships between the recovery time after discharge and the fan rotation frequency or the discharge voltage are discussed. The results show that there exit vortexes with slow flow velocity near the laser window. While in the center of the gain zone, the field is even with fast flow velocity. And in the moment after discharge, the flow field stagnation phenomenon with extremely slow velocity occurs.
Particle image velocimetry(PIV) technique is used to measure the flow field in the gain zone of a closed loop pulsed XeF(C-A) blue-green excimer laser. The flow velocity characteristics of the steady flow field in the center of the flow field, near the laser window and between the two parts in the discharge zone are studied. The flow field states in different time during the process of the discharge are analyzed. Furthermore, the relationships between the recovery time after discharge and the fan rotation frequency or the discharge voltage are discussed. The results show that there exit vortexes with slow flow velocity near the laser window. While in the center of the gain zone, the field is even with fast flow velocity. And in the moment after discharge, the flow field stagnation phenomenon with extremely slow velocity occurs.
引文
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[2] Bulaev V D, Gusev V S, Kazantsev S Y, et al. High-power repetitively pulsed electric-discharge HF laser[J]. Quantum Electronics, 2010, 40(7): 615-618.
[3] Yu L, Liu J R, Ma L Y, et al. 10 J energy-level optically pumped XeF(C-A) laser with repetition mode[J]. Optics Letters, 2007, 32(9): 1087-1089.
[4] Meng F J, Li D J, Sun S H, et al. Arc-discharge monitoring system of a high-power repetitively-pulsed TEA CO2 laser[J]. Journal of Russian Laser Research, 2012, 33(4): 362-368.
[5] Huang K, Huang C, Zhao L, et al. Effects of flow field uniformity on energy stability of discharge initiated repetitively pulsed HF laser[J]. Infrared and Laser Engineering, 2016, 45(1): 65-70. 黄珂, 黄超, 赵柳, 等. 流场均匀性对重频HF激光能量稳定输出的影响[J]. 红外与激光工程, 2016, 45(1): 65-70.
[6] Zhu N W. FLUENT-based numerical simulation of gas flow field of excimer laser[D]. Hefei: University of Science and Technology of China, 2017: 7. 朱能伟. 基于FLUENT的准分子激光器气体流场数值仿真[D]. 合肥: 中国科学技术大学, 2017: 7.
[7] Harris M R, Morris A V, Gorton E K. Closed-cycle 1-kHz-pulse-repetition-frequency HF(DF) laser[J]. Proceedings of SPIE, 1998, 3268: 247-252.
[8] Liu L. Study on internal flow of the small room of ventilation by numerical simulation and PIV[D]. Harbin: Harbin Institute of Technology, 2012: 1. 刘磊. 气流小室流场数值模拟及PIV实验研究[D]. 哈尔滨: 哈尔滨工业大学, 2012: 1.
[9] Liu J, Dong H B, Liu Y. Review and recent advances in uncoupled algorithms for chemical non-equilibrium flows[J]. Acta Aeronautica et Astronautica Sinica, 2018, 39(1): 021090. 刘君, 董海波, 刘瑜. 化学非平衡流动解耦算法的回顾与新进展[J]. 航空学报, 2018, 39(1): 021090.
[10] Qu X J, Song Y, Jin Y, et al. 3D SAPIV particle field reconstruction method based on adaptive threshold[J]. Applied Optics, 2018, 57(7): 1622-1633.
[11] Cozzi F, Coghe A, Sharma R. Analysis of local entrainment rate in the initial region of isothermal free swirling jets by stereo PIV[J]. Experimental Thermal and Fluid Science, 2018, 94: 281-294.
[12] Im S, Kim H T, Rhee B W, et al. PIV measurements of the flow patterns in a CANDU-6 model[J]. Annals of Nuclear Energy, 2016, 98: 1-11.
[13] Li Y, Feng Z, Shen Y L, et al. A narrow linewidth and tunable XeF(C-A) laser[J]. Laser Physics, 2013, 23(8): 085006.
[14] Chen L, Li Y, Qin X L, et al. A multi-frame integration technique based on mode theory for low light level image[J]. Acta Electronica Sinica, 2011, 39(10): 2217-2220. 陈立, 李野, 秦旭磊, 等. 基于众值理论的微光图像帧积分算法[J]. 电子学报, 2011, 39(10): 2217-2220.
[15] Keane D, Adrian J. Optimization of particle image velocimeters: I. double pulsed systems[J]. Measurement Science and Technology, 1990, 1(11): 1202-1215.
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