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research-article

Experimental and Analytical Characterization of Alternative Aviation Fuel Sprays Under Realistic Operating Conditions

[+] Author and Article Information
Andrew Corber

National Research Council of Canada, Ottawa, Ontario, Canada
andrew.corber@nrc.ca

Nader Rizk

Rolls Royce Corporation, Retired, Indianapolis, IN, USA Wajid Ali Chishty, National Research Council of Canada, Ottawa, Ontario, Canada
nkrizk@yahoo.com

Wajid A. Chishty

National Research Council of Canada, Ottawa, Ontario, Canada
wajid.chishty@nrc.ca

1Corresponding author.

ASME doi:10.1115/1.4041649 History: Received August 14, 2018; Revised September 05, 2018

Abstract

The National Jet Fuel Combustion Program (NJFCP) is an initiative being led by the Office of Environment & Energy at the FAA, to streamline the ASTM certification process for alternative aviation fuels. To achieve this objective, the program has identified specific applied research tasks in several areas. The National Research Council of Canada (NRC) is contributing to the NJFCP in the areas of sprays and atomization and high altitude engine performance. This paper describes work pertaining to atomization tests using a reference injection system which involves characterization of the nozzle, comparison of sprays and atomization quality of various conventional and alternative fuels, and the use of the experimental data to validate spray correlations. The paper also briefly explores the viability of a new spray diagnostic system that has potential to reduce test time in characterizing sprays. Measurements were made from ambient up to 10 bar pressures in NRC's High Pressure Spray Facility using optical diagnostics including laser diffraction, phase Doppler anemometry (PDA), LIF/Mie Imaging and laser sheet imaging to assess differences in the atomization characteristics of the test fuels. A total of nine test fluids including six NJFCP fuels and three calibration fluids were used. The experimental data was then used to validate semi-empirical models, developed through years of experience by engine OEMs and modified under the NJFCP, for predicting droplet size and distribution. The work offers effective tools for developing advanced fuel injectors, and generating data that can be used to significantly enhance multi-dimensional combustor simulations.

National Research Council of Canada
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