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A new regime of chemical oxygen-iodine laser (COIL), high-pressure subsonic mode operation, was demonstrated using a jet-type
singlet oxygen generator (SOG). The laser output power of 342 W with chemical efficiency of 20.9% was obtained at the Cl2 flow rate of 18 mmol/s and the operating pressure of 6.4 Torr in the laser cavity. The specific energy was 3.1 J/l which
was four times higher than our supersonic device, and was comparable to the highest value for the supersonic regime. The experimental
results were in good agreement with the numerical simulation results.
Received: 26 February 1999 / Revised version: 13 July 1999 / Published online: 30 November 1999 相似文献
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GAO Zhi HU Limin & SHEN Yiqing Institute of Mechanics Chinese Academy of Sciences Beijing China 《中国科学G辑(英文版)》2004,47(3):338-351
The gas pressure in a laser cavity of flowing chemical oxygen-iodine laser (COIL)is about 133.31333 Pa[1]. In this pressure range, effects of homogeneous and inhomo-geneous broadening competing with each other on the performances of a COIL are no-ticeable. Generally, a rate equation (RE) model is adopted to the performance modeling of a supersonic COIL, such as in refs. [1—4]. This model assumes the spectral line pro-file is homogeneously broadened. Homogeneous broadening assumption sim… 相似文献
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通过采用Cl2流量250mmol/s列管射流式氧发生器的COIL出光实验,得到了激光输出功率随碘副气流相对于氧主气流混合穿透深度的变化规律。实验结果表明,穿透深度对激光功率影响较大,存在最佳穿透深度,约为3.16mm,计算的最佳穿透深度与实验得到的最佳穿透深度基本一致。通过逐步改变供碘系统的碘气流流量,测量激光的输出功率,在实验上证实并找到了COIL的最佳碘流量值,约为4.5mmol/s,这一结果比以往文献所登载的最佳碘流量值要确切。 相似文献
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We present the design and investigation of a novel chemosorption vacuum pump (CSVP) for discharging the exhaust gases of a chemical oxygen-iodine laser system diluted with carbon dioxide (CO2-COIL). The CSVP comprises two fixed-bed reactors separately filled with CO2/H2O and O2/I2/Cl2 adsorbents, which can efficiently chemically absorb the CO2-COIL exhaust gases at room or higher temperature. We consider the effects of the adsorbents in different specifications and fixed beds of various constructions on the adsorption performance of the CSVP. We develop and study the sealed CO2-COIL system with the CSVP. We achieve a stable operation with a cumulative duration time of 40 s for four runs and an average output power up to 2.0 kW at a Cl2 flow rate of ~158 mmol/s and a CO2 flow rate of 132 mmol/s. The experimental results indicate that the COIL system with the CSVP performs similarly to a conventional COIL with a vacuum tank. Taking into account that the CSVP is free of vibration and noise, avoids air pollution, is easily operated, and has a short preparation time, we believe that the chemosorption vacuum pump is an excellent alternative pump system for a transportable COIL system. 相似文献
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P. A. Mikheyev M. V. Zagidullin V. N. Azyazov 《Applied physics. B, Lasers and optics》2010,101(1-2):7-10
A cw chemical oxygen-iodine laser (COIL) operating in a subsonic mode with a high water content of ~15% and external production of iodine atoms in CH3I/Ar dc glow discharge has been demonstrated. A straightforward comparison of COIL performance for two cases—conventional, when I2 was injected in the singlet oxygen flow, and when iodine atoms produced externally together with other discharge products were injected—was made. In the latter case nearly four times increase in output power was observed, suggesting that the relaxation of the energy stored in the singlet oxygen slowed down substantially, when the laser operated using CH3I/Ar discharge products instead of iodine molecules. 相似文献
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Chemical oxygen iodine laser (COIL) is a high-power laser with potential applications in both military as well as in the industry. COIL is the only chemical laser based on electronic transition with a wavelength of 1.315 μm, which falls in the near-infrared (IR) range. Thus, COIL beam can also be transported via optical fibers for remote applications such as dismantling of nuclear reactors. The efficiency of a supersonic COIL is essentially a function of mixing specially in systems employing cross-stream injection of the secondary lasing (I2) flow in supersonic regime into the primary pumping (O21Δg) flow. Streamwise vorticity has been proven to be among the most effective manner of enhancing mixing and has been utilized in jet engines for thrust augmentation, noise reduction, supersonic combustion, etc. Therefore, a computational study of the generation of streamwise vorticity in the supersonic flow field of a COIL device employing a winglet nozzle with various delta wing angles of 5°, 10°, and 22.5° has been carried out. The study predicts a typical Mach number of approximately 1.75 for all the winglet geometries. The analysis also confirms that the winglet geometry doubles up both as a nozzle and as a vortex generator. The region of maximum turbulence and fully developed streamwise vortices is observed to occur close to the exit, at x/λ of 0.5, of the winglets making it the most suitable region for secondary flow injection for achieving efficient mixing. The predicted length scale of the scalloped mixer formed by the winglet nozzle is 4λ. Also, the winglet nozzle with 10° lobe angle is most suitable from the point of view of mixing developing cross-stream velocity of 120 m/s with acceptable pressure drop of 0.7 Torr. The winglet geometry with 5° lobe angle is associated with a low cross-stream velocity of 60 m/s, whereas the one with 22.5° lobe angle is associated with a large static and total pressure drop of 1.87 and 9.37 Torr, respectively, making both the geometries unsuitable for COIL systems. The experimental validation shows a close agreement with the computationally predicted values. The studies for the most suitable 10° lobe angle geometry show an observed Mach number of 1.72 with an improved mixing efficiency of 74% due to the occurrence of predicted streamwise vortices in the flow. 相似文献
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N. P. Vagin D. G. Karapetyan A. F. Konoshenko P. G. Kryukov V. S. Pazyuk V. N. Tomashov N. N. Yuryshev 《Journal of Russian Laser Research》1994,15(3):213-242
Results of an experimental investigation of a chemical oxygen-iodine laser (COIL) are presented. We determine the factors
influencing the efficiency of a chemical singlet-oxygen generator (SOG) of the bubbler type operating on the chlorination
of an alkaline solution of oxygen peroxide. We describe SOG constructions. A cw COIL with output power up to 400 W is developed
on the basis of the investigated SOG. The feasibility of a modular construction of high-power COIL is demonstrated. A power-output
level of 1 kW was achieved with a two-section laser. The feasibility is analyzed of COIL operation in a pulsed regime by pulsed
bulk accrual of iodine atoms. We show that in this regime the laser can be operated without a low-temperature trap. An advantage
of such a regime is also the possibility of controlling, in a wide range, the lasing pulse duration. A strong influence of
molecular chlorine on the energy content of the active medium is observed when alkyliodides are used as iodine donors. The
possibilities of using a pulsed COIL for controlled thermonuclear fusion are discussed.
Translated from Trudy Fizicheskogo Instituta im. P. N. Lebedeva Akademiya Nauk SSSR, Vol. 194, pp. 114–147 (1989). 相似文献
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氧碘化学激光器(COIL)在化学反应条件下,由于光腔及扩压器的气流通道内存在残余化学反应放热,从而导致"热堵"现象发生,影响了扩压器的正常启动及光腔内超声速流场的流动品质。采用数值模拟方法对COIL光腔与超声速扩压器流道内的化学反应流场进行研究,对超声速扩压器插入段的长度、楔形体的数量级扩散段长度对化学反应流场的影响进行研究。数值模拟结果表明:通过优化插入段及楔形体长度、取消扩压器侧壁的半楔形体,改善了因化学反应放热对光腔及扩压器流场造成的不利影响。优化后,光腔内的流动不再受气流分离产生的斜激波的影响,扩压器二喉道内的分离现象消失,扩压器壁面的分离区减小,出口流动更加均匀,"热堵塞"现象消失。化学反应条件下的气流总压损失比冷流时提高约15%,光腔与扩压器的总压恢复系数为0.426,进出口的静压比为3.75,比优化前提高了约25%。 相似文献
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A chemical oxygen-iodine laser (COIL) is an electronic transition, low pressure, high throughput system. The field use of this laser demands the development of suitable pressure recovery systems. Ejector based pressure recovery systems form a potent alternative for open cycle COIL operation. The two possible configurations of motive gas injection in ejectors are peripheral and central. The present paper focuses on the investigation of a central injection low pressure ejector operated with a small scale supersonic COIL (SCOIL). The ejector handles a motive flow of nearly 120 g s−1 and an entrained laser flow of nearly 3 g s−1. The predicted geometry using integral methods has been validated numerically by employing Fluent 6.1 software in a 2-d axisymmetric viscous turbulent flow formulation. The numerical predictions have been experimentally validated, which indicate a pressure recovery of 63 Torr at design conditions. The results also show that the recovered pressure improves to 75 Torr for an off-design condition of higher motive flow rate. 相似文献