The paper is dealing with a chemical laser system that can be used not only as a new strategic weapon system for military purposes, but also as a manufacturing tool in industrial areas due to the characteristics of high power laser beams in the megawatt range. In order to increase laser beam power in the chemical laser system, mixing efficiency of fuel and oxidant has to be increased and more excited molecules must be produced by means of chemical reaction. Basically, the production of more excited molecules in the laser cavity results from the high mass flow rates of fuel and oxidant as well as high mixing and reaction efficiencies. However, this is difficult for the planar nozzle array which has been widely used until now to supply high mass flow to the chemical laser cavity. A radial expansion nozzle array as an innovated alternative of the planar nozzle system is presented in the paper. The laser beam generation in this system is achieved by mixing F atoms, from a supersonic nozzle and D2 molecules from the holes of a round-bended supply line which are distributed with zigzag configuration, hence the reaction surface will be stretched. The effects of D2 injection angles with the main F flow on mixing enhancement and laser beam power are numerically investigated. The results are discussed by comparison with three cases of D2 injection angles; 10, 20 and 40 with the main flow direction. Major results reveal that the area where the DF(1) excited molecules as a representative product in the DF chemical laser system are produced becomes larger when the D2 injection angle increases.
Numerical analysis of performance of DF chemical laser with a radial-expansion nozzle array according to D2 injection angles
Numerische Analyse der Leistung chemischer DF-Laser mit einem radialexpandierten Düsenarray entsprechend der D2-Einspritzwinkel
2004
8 Seiten, 11 Bilder, 9 Quellen
Aufsatz (Konferenz)
Englisch