Accession Number : AD0744947

Title :   An Analytical Investigation of the Effect of Nozzle Throat Radius of Curvature on Gasdynamic Laser Gain.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Wagner,Jerry L. ; Anderson,John D. , Jr

Report Date : 01 MAY 1972

Pagination or Media Count : 26

Abstract : Numerical solutions for CO2-N2 gasdynamic laser gain and maximum available power are used to examine the influence of nozzle throat radius of curvature and throat height on laser performance. Conventional gasdynamic laser nozzles incorporate minimum length supersonic contours with sharp throats in order to obtain rapid vibrational freezing of the gas. The study considers the effect of complete rounding of the throat (on both the subsonic and supersonic sides), up to a radius of cruvature equal to three throat heights. Such rounding allows easier manufacture and alignment of the nozzles, and should result in improved flow quality. The present results show a 15-percent reduction in laser gain and maximum available power due to complete rounding of the throat. (Author)

Descriptors :   (*GAS LASERS, NOZZLE THROATS), (*INFRARED LASERS, GAIN), NOZZLE GAS FLOW, CARBON DIOXIDE, NITROGEN, NONEQUILIBRIUM FLOW, PERFORMANCE(ENGINEERING)

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE