Accession Number : AD0732622

Title :   Evaluation of Cryogenic Nitrogen as a Fire-Extinguishing Agent for Aircraft Powerplant Installations.

Descriptive Note : Final rept. 1968-1971,

Corporate Author : NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J

Personal Author(s) : Chamberlain,George ; Klueg,Eugene P.

Report Date : NOV 1971

Pagination or Media Count : 129

Abstract : Proposals have been made to carry liquid nitrogen (LN2) aboard commercial aircraft for the purpose of powerplant fire extinguishment. Testing was conducted to determine the feasibility of using LN2 as an aircraft powerplant fire-extinguishing agent and also to determine the characteristics of LN2 when used as an extinguishment. The tests were conducted in a fire test facility using a full-scale aircraft turbojet engine and nacelle for subsonic low-altitude flight condition simulation and also in a mockup engine/nacelle facility where nacelle volume and airflow could be varied. All fire tests were conducted using JP-4 jet fuel which was spray released and spark ignited. The report also describes the effects of an inadvertent discharge on engine components, the effects of a damaged cowling, and the cooling of potential reignition sources.

Descriptors :   (*FIRE EXTINGUISHERS, *LIQUEFIED GASES), (*AIRCRAFT ENGINES, *FIRE SAFETY), CIVIL AVIATION, CRYOGENICS, NITROGEN, FEASIBILITY STUDIES, TEST METHODS, TEST FACILITIES

Subject Categories : Safety Engineering
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE