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Title: Advanced aircraft ignition CRADA final report

Conventional commercial and military turbo-jet aircraft engines use capacitive discharge ignition systems to initiate fuel combustion. The fuel-rich conditions required to ensure engine re-ignition during flight yield less than optimal engine performance, which in turn reduces fuel economy and generates considerable pollution in the exhaust. Los Alamos investigated two approaches to advanced ignition: laser based and microwave based. The laser based approach is fuel ignition via laser-spark breakdown and via photo-dissociation of fuel hydrocarbons and oxygen. The microwave approach involves modeling, and if necessary redesigning, a combustor shape to form a low-Q microwave cavity, which will ensure microwave breakdown of the air/fuel mixture just ahead of the nozzle with or without a catalyst coating. This approach will also conduct radio-frequency (RF) heating of ceramic elements that have large loss tangents. Replacing conventional systems with either of these two new systems should yield combustion in leaner jet fuel/air mixtures. As a result, the aircraft would operate with (1) considerable less exhaust pollution, (2) lower engine maintenance, and (3) significantly higher fuel economy.
Authors:
Publication Date:
OSTI Identifier:
442125
Report Number(s):
LA-CRADA--97-2
ON: DE97003447; CRN: C/LANL--LC9510196; TRN: 97:001369
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: [1997]
Research Org:
Los Alamos National Lab., NM (United States)
Sponsoring Org:
USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; IGNITION SYSTEMS; PERFORMANCE TESTING; DESIGN; TURBOJET ENGINES; AIRCRAFT; FUEL-AIR RATIO; LASER RADIATION; HIGH-FREQUENCY DISCHARGES; AIR POLLUTION ABATEMENT; FUEL CONSUMPTION