Researches in Thermal Laser for a System of Cascading Energy Conversion into Light, Motive Energy and Thermal Energy

提出了一种将燃烧产生的高温高压能量转换为三种模式能量的级联能量转换系统。这些能量模式是激光放大、动能和热能。本研究提取了建立三模能量转换系统所需的条件，并对热激光放大进行了初步的研究。系统存在的问题主要集中在两点。由于在激光装置后安装了燃气涡轮机，CO_2粒子数反转引起的红外激光放大对燃烧温度和压力的要求与一般气动激光器的条件完全不同。另一种是粒子数反转过程中CO_2分子的减少。这就是为什么激光介质中H_2O含量的增加会使CO_2分子失活的原因，虽然激光介质中产生CO_2，N_2，H_2O的混合物，但激光介质中的H_2O含量的增加会使CO_2分子失活 关于我们 与碳氢化合物的燃烧反应连续进行。对红外激光放大所需的CO_2粒子数反转的识别进行了实验和理论研究。取得的成果如下。气体以超音速快速流过喷嘴，这迫使平移温度下降到较低的值。结果表明，低能级的振动温度接近于平动温度，而高能级的振动温度接近于膨胀前温度。实验研究了甲烷在富氧场中燃烧产生的激光介质对10.6 μm红外光的放大作用。富氧燃烧是一种容易产生高温高压气体的燃烧方法。在适当的燃烧条件下确定了增益。认为O_2的振动能级（=1556 cm ~ 2）与H_2O的振动能级（1595 cm ~ 2）接近，降低了上层CO_2的失活<-1><-1>。少

A cascading energy-conversion-system which transforms a high-temperature and high-pressure energy generated by a combustion into three modes energy is proposed. These energy modes are laser amplification, motive energy and thermal one. In this research, the required conditions are extracted to establish the three modes energy-conversion-system and preliminary works in the amplification of the thermal laser have been investigated. The problems in the system are focused into two points. Because of installation of a gas turbine behind the laser equipment, requirements of the combustion temperature and the pressure for an amplification of the infrared laser caused by a population inversion of CO_2 are completely dissimilar with the conditions of general gas dynamic laser. Other one is decrease of CO_2 molecule in population inversion. This is why an increase of H_2O fraction in a laser medium causes deactivation of exited CO_2 molecules although mixtures of CO_2, N_2, H_2O are generated co … More ntinuously with a combustion reaction of hydrocarbons. Experimental and theoretical researches in an identification of CO_2 population inversion required for the infrared laser amplification were investigated. Results achieved are shown as follows. The gas flows quickly through a nozzle at supersonic speed, which forces the translational temperature to drop to a lower value. In the results, the vibrational temperature of the lower level being close to the translational temperature, while the vibrational temperature of the upper level is close to pre-expansion temperature. An amplification of 10.6 μm infrared light is investigated experimentally with the laser medium which is produced from combustion of CH_4 in O_2-enriched field. O_2-enriched combustion is adopted as a method that produces high temperature-high pressure gas easily. Plus gains are identified under adequate combustion conditions. It is considered that the deactivation of the upper level CO_2 is reduced because vibration energy level of O_2 (=1556 cm^<-1>) is close to that of H_2O (1595 cm^<-1>). Less