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Study on Cylindrical Gain Generator Assembly for Continuous Wave HF Chemical Laser

Author: JinDongHuan
Tutor: ZhaoYiJun；LuQiSheng；LiuWenGuang
School: National University of Defense Science and Technology
Course: Optical Engineering
Keywords: Chemical lasers Ring cylindrical gain generator Three impinging jets The high supersonic cryogenic nozzle Numerical Simulation Output spectrum
CLC: TN248.5
Type: PhD thesis
Year: 2011
Downloads: 10
Quote: 1
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Abstract

Ring the columnar HF chemical laser is currently the world's highest CW output power of the laser. Ring the columnar gain generator is the core component of the ring the columnar chemical lasers. This paper focuses on the ring the columnar gain generator carried out numerical simulation and theoretical design and experimental studies. Combination of minimum free energy method and mass flow conservation principle derived the the F atom molar flow nozzle throat surface density formula, given the one-dimensional analysis of the combustion chamber, the combustion chamber of the HF chemical laser NF3-D2-He system chemical equilibrium composition was calculated to study the impact of the flow regulator of each input stream to the total temperature of the combustion chamber, the total pressure, F atom yield. The trend of changes in the pressure of the combustion chamber is the same as with the experimental results. Ring cylindrical gain generator three-dimensional numerical simulation of theoretical models of the the diversion pipeline in the gain generator, injectors and combustion chambers, the main nozzle, coupling segment and the flow field of the optical cavity were three-dimensional numerical simulation studies. The single-ended and double-ended way different supply hot wall face of the the diversion pipeline flow field characteristics. Comparative analysis pipeline ring and linear shunt, shunt pipeline branch pipe branch pipe in the ring on the outer arc flow differences smallest, most advantageous airflow evenly distributed. Combined the vortex dissipation model and Arrhenius chemical reaction rate coefficients were used to describe the chemical reaction of the combustion chamber, the fuel mix FOF, OFO three impinging injector cold flow field and combustion chamber and reacting flow in the three-dimensional numerical simulation study. The results show that, for certain fuel ratio and the characteristic length of the combustion chamber, the OFO injection allows the combustor exit F2 13.5% increase in the degree of dissociation, the experimental results also confirmed this conclusion. To carry out the main nozzle contraction segment linear numerical calculation and found that the combination of the arc and a straight curve design airflow of the main nozzle total pressure loss is slightly larger, but the composite proportion of the nozzle exit of F atoms compared low, and the main nozzle of the relative ease of processing, and can reduce processing costs. In considering the conditions of the combustion chamber wall heat loss, a three-dimensional numerical simulation of the flow field of the the coupling segment ring HYLTE nozzle and optical cavity area, the obtained optical cavity small signal gain coefficient distribution, spectral measurements and moving light axis experiments confirmed the reasonableness of the calculation model. The above numerical simulation results for subsequent ring cylindrical gain generator design and experimental guidance. Design and build a 1/4 ring cylindrical gain generator experimental platform. The calculation method of the laser, each of the input air flow. By numerical simulation method to study the the different the backpressure below,'s Tsui flow field characteristics, a reasonable design venturi Tsui parameters, accurate reference monitoring venturi Tsui conditions. Reasonable to simplify the design of the ring HYLTE nozzle. The annular injector and ring HYLTE of nozzle processing program and process. The design flow Idemitsu experiment power meter to detect a light power at about 60W. Experiment to measure the combustion chamber temperature and pressure. Similar to the experimental data of the Alpha laser HL911-3, the combustion chamber temperature and pressure there is a climb segment. The measured value and the calculated value of the numerical simulation of the difference in static pressure is less than 1%. Ring cylindrical gain generator along the angular expansion characteristics makes the optical cavity pressure is very low, only 0.5kPa so. He flow changes in flow regulation was found, changes in laser power and ignition stability is significantly better than the main He flow changes. To verify the effective formation of the ring the columnar gain area, three pairs of light extraction hole Idemitsu experimental results show that each pair of light hole has a power output, to prove gain generator designed to run properly, effectively forming a ring columnar gain zone. The experimental data show that: the rational design of experimental apparatus, operating parameters to run normal high temperature, highly corrosive environments, the device is able to maintain good sealing properties and mechanical properties.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser > Chemical lasers
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