Fuel Spray Ignition by Hot Surfaces and Stabilization of Aircraft Fires.
Abstract
In Task I, the research primarily involved refinement of the experimental apparatus, instrumentation, measurement techniques, and acquisition of experimental data. Special efforts were made to assure the reliability of the measurements, including runs made to examine the process of oxide formation when using pure nickel surfaces. Experimental data were acquired for both liquid kerosine (Jet-A) and gaseous commercial propane fuels over a broad range of run conditions. Evaluation of the results in the context of existing theories and modifications of the CONCHAS-SPRAY code to model this experimental system were also undertaken. In Task II, the extensive experimental results on blowoff velocity, obtained using both conventional Vee-gutter and single-sided flameholders, provided the data base for an analytical study of the factors governing the stability characteristics of bluff-body flameholders. An equation was derived for predicting blowoff velocity in terms of flameholder size, flameholder blockage, ambient air pressure and temperature, and temperature, and laminar flame speed. Predictions of blowoff velocity based on this equation showed excellent agreement with experimental values. In Task III, experimental studies were completed and results correlated for ventilation flow from surroundings into a cavity with a small internal flow. Extensive flow visualization studies were also undertaken for flow past a protrusion, including the case of a jet through the protrusion. These studies provided data on formation of vortices adjoining and over the protruberance and the nature of jet flow entrainment into them.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 15, 1985
- Accession Number
- ADA174652
Entities
People
- A. H. Lefebvres
- J. G. Skivffstad
- S. N. Murthy
Organizations
- Purdue University