NDLI: Experimental behavior of pentaborane-air combustion products during expansion in a convergent divergent nozzle

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Experimental behavior of pentaborane-air combustion products during expansion in a convergent divergent nozzle

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1958
Description	In order to evaluate the post combustion behavior of boric oxide, pentaborane-air mixtures, burned to completion at a combustor pressure of 3 atmospheres, were expanded through a 7.1-inch-long convergent-divergent nozzle having a 4-inch-diameter throat and an exit-to-throat area ratio of 1.68. The experimentally determined thrust performance was in good agreement with the ideal equilibrium performance at stagnation temperatures of 3300 deg R and lower. The boric oxide vapor at the combustor exit required about 400 F deg supercooling before any condensed phase was observed. For a given thrust, fuel consumption was as much as 20 percent greater than predicted from vapor-pressure data for combustor outlet temperatures i n the vicinity of 3600 deg R. A similar result could be expected in full-scale engines, since the test combustor provided an unusually long dwell time and a highly turbulent environment. During the expansion process, the vapor (when present) did not condense to the extent predicted for an equilibrium expansion process. Moreover, condensation was observed only i n the form of small, abrupt phase changes i n the subsonic flow near the throat. Friction, due to liquid boric oxide films on the nozzle surfaces, was negligible when the surface temperature was above 800 F.
File Size	6323409
Page Count	71
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19670022401
Archival Resource Key	ark:/13960/t80k73n7n
Language	English
Publisher Date	1958-02-18
Access Restriction	Open
Subject Keyword	Pentaborane Boron Oxide Jet Fuel Afterburning Convergent-divergent Nozzle Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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