Studies on Numerical Gas Dynamic Laser Facility

燃烧驱动的CO_2气体动力激光器由燃烧系统、气体动力学系统（超音速流动和振动弛缓）和光学系统（谐振器及其子系统）三部分组成。CO_2 GDL的性能是由这些元素的特性共同决定的。本研究组成了一个数值气体动态激光装置（NGDL），该装置具有用于计算各组成部分特性的数值代码。NGDL是在给定燃料和氧化剂时绘制小信号增益和/或激光功率输出，用于系统优化工具。研究结果总结如下：1。本研究的目的已圆满完成。该NGDL已应用于C_6H_6（苯）/O_2（氧）体系。阐明了各元件的特性对小信号增益和激光功率的影响。获得最佳的燃料/氧化剂组合是有可能的。该NGDL可用于对实验设备的性能进行预期和评价。在数值代码处理程序的建立、计算精度的提高以及对GDL物理现象的准确描述等方面还需要进行更多的研究。

A combustion-driven CO_2 GDL (CO_2 Gas Dynamic Laser) consists of several elements of combustion system, gas-dynamics (supersonic flow and vibrational relaxation) system, and optics (resonator and its sub-system) system. Performances of CO_2 GDL is governed by combination of characteristics of these elements.This research composes a Numerical Gas Dynamic Laser Facility (NGDL) which has numerical codes for calculation of characteristics of each component. The NGDL is to draw an output of small-signal gain and/or laser power when fuel and oxidizer are given and to be used for tool for system optimization.The results are summarized as follows:1. The objectives of this research was satisfactorily accomplished.2. This NGDL has been applied to a system of C_6H_6 (Benzene)/O_2 (Oxygen). Effect of characteristics of each element on small-signal gain and laser power has been clarified. It may be possible that the optimal combination of fuel/oxidizer can be obtained.3. This NGDL can be applied for expectation and evaluation of the performance of the experimental facility.More researches are required for establishment of treatment procedure of numerical codes, improvement of computational accuracy and exact description of physical phenomena of GDL.