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Development of exhaust gas pressure recovery system for supersonic-flow chemical oxygen-iodine lasers

超音速化学氧碘激光器废气压力回收系统的研制

基本信息

批准号：
15560134
负责人：
MASUDA Wataru
金额：
$ 1.92万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560134/
关键词：
Chemical laser Supersonic mixing Ramp nozzle High-Power laser

项目摘要

One of the hindrances in industrial applications of supersonic-flow chemical oxygen-iodine laser (S-COIL) is the lowness of the exhaust gas pressure, due to which a massive pressure-recovery system is required to implement the discharge of the spent working mixture. In order to downsize the system, the stagnation pressure of the exhaust gas should be improved by means of utilizing an active oxygen-iodine gain medium at a higher total-pressure. However, the stagnation pressure of the oxygen flow, which is introduced to the mixing chamber, cannot be raised since singlet oxygen generators available today operate at a low pressure. The iodine flow, on the other hand, can be boosted to higher pressure. By mixing this high-pressured iodine flow with the low-pressured oxygen flow, we can raise the total pressure of the gain medium. In order to do this without causing shockwave or other undesirable effects, the iodine flow should be expanded enough so that the pressures of both flows match whe … More n they join. In other words, the iodine flow having higher Mach number should be mixed with the oxygen flow having lower Mach number. Thus, in this study, the mixing characteristics between two flows having different Mach numbers are numerically examined. A supersonic, parallel mixing system with ramp nozzle array is adopted.Three types of nozzles, namely, (a) ramp nozzle, (b) symmetric ramp nozzle, and (c) symmetric swept-ramp nozzle are examined. Each of the nozzle arrays has an unevenly-piled shape with the intention of causing vortex and enhancing mixing. The two flows of oxygen and iodine expand separately in the nozzle : The flow of singlet-delta oxygen at a low stagnation pressure accelerates to unit Mach number, while the flow of iodine, which is diluted with nitrogen, at high stagnation pressure does to a higher Mach number (= 4.8). The nozzle dimensions and plenum conditions of the flows are determined based on the examination of an equivalent one-dimensional flow.The characteristics of mixing between two flows of oxygen and iodine, having different Mach numbers, are numerically examined with the intention of improving the pressure recovery of the exhaust gas of supersonic-flow COIL. The flow fields are calculated for three types of nozzles, namely, ramp nozzle, symmetric ramp nozzle, and symmetric swept-ramp nozzle. The results indicate that the symmetric swept-ramp nozzle has significantly higher gain and negligibly lower exhaust gas pressure than other two. Less

阻碍超音速流动化学氧碘激光器(S线圈)工业应用的一个障碍是排气压力低，这就需要一个庞大的压力回收系统来实现废工作混合物的排放。为了实现系统的小型化，应在较高的总压下利用活性氧碘增压介质来改善废气的滞止压力。然而，由于目前可用的单线态氧发生器在低压力下运行，因此无法提高引入混合室的氧气流动的停滞压力。另一方面，碘的流量可以被提升到更高的压力。通过将这种高压碘流与低压氧流混合，我们可以提高增益介质的总压。为了在不引起冲击波或其他不良影响的情况下做到这一点，碘流量应足够扩大，以使两个流量的压力与…相匹配。他们加入的人数更多。换言之，马赫数较高的碘流应与马赫数较低的氧流混合。因此，本研究对具有不同马赫数的两个流动之间的混合特性进行了数值研究。采用具有斜面喷管阵列的超音速平行混合系统，研究了(A)斜面喷嘴、(B)对称斜面喷嘴和(C)对称后掠面斜面喷管三种类型的喷嘴。每个喷嘴阵列都具有不均匀堆积的形状，目的是引起漩涡和增强混合。氧气和碘的两种流动在喷嘴中分别膨胀：单线态氧在低滞留压力下加速到单位马赫数，而碘在高滞留压力下用氮气稀释后加速到较高的马赫数(=4.8)。通过对一维等效流的考察，确定了喷嘴尺寸和静压条件，并对不同马赫数的氧气和碘两股气流的混合特性进行了数值研究，以提高超音速流动盘管排气的压力恢复。对斜面喷管、对称斜面喷管和对称后掠面斜面喷管的流场进行了计算。结果表明，对称后掠斜式喷管比其他两种喷管具有更高的增益和可以忽略不计的排气压力。较少