Engineering topics
Publications and source records attributed to Lee, G..
A theory has been developed for calculating the laser power of CO2 gasdynamic lasers. A three-mode vibrational gas model was assumed, and the coupled rate and one-dimensional conservation equations were solved by the time-dependent technique. The results were compared with experimental data, and the agreement was good.
Potential laser applications for space-borne power generation are discussed in the light of the current state of the art. The feasible ranges of various laser classes with standing waves are estimated. Power and efficiency, mirror factors, phased-array performance and beam patterns are analyzed as selection characteristics. Other topics include the maximum receiving-element size, energy conversion, pointing and tracking, causes of deformation, and mirror distortions. It is theorized that a nuclear-fueled laser satellite could beam power to distances twice the earth-sun distance with predictable pointing accuracies.
CW carbon dioxide gasdynamic laser gain for mixture of carbon dioxide, nitrogen and helium
This paper presents experimental and theoretical studies of the small signal gain and the radiant power for one configuration of CO2 gasdynamic lasers to define the optimum-gas temperature, pressure and gas compositions for the gain and the laser power. The laser was operated with two gas mixtures (CO2-N2-He and CO2-N2-H2O) at temperatures of 800-2200 deg K, pressures of 2-16 atm, and a wide range of gas compositions. For this laser optimum gas temperatures were roughly 1500-1600 deg K for gain and more than 2200 deg K for power. It was found that the gasdynamic laser would not oscillate for He or H2O concentrations of less than 10% and 1%, respectively. The various kinetic processes for establishing gain and the various laser cavity parameters that determine laser power were examined. The theories were assessed for their ability to predict gain and power. In most cases, the gain theory gave excellent quantitative results whereas the power theory gave only qualitative results. Laser power of nearly 2 kw was obtained.
Surface pressure and heat transfer over blunt conical body in hypersonic flow with uniform mass addition of various gases
Input/output routines and computerized simulation for error analysis
Computer program for simulated trajectory error analysis
Apollo afterbody heat transfer, studying ablation effects for various reentry angles of attack
Surface pressure and heat transfer over blunt conical body in hypersonic flow with uniform mass addition of various gases
Hypersonic flow over blunt flat plate with surface mass transfer
Apollo afterbody heat transfer and pressure with and without ablation at Mach numbers 5.8 - 8.3
One and two impulse orbital transfer - optimal n-impulse problem including copolar elliptical orbits