Fossil Fuels Petroleum

Jet fuel ignition delay times: Shock tube experiments over wide conditions and surrogate model predictions

Authors: Vasu, Subith S. Davidson, David F. Hanson, Ronald K. [Mechanical Engineering Department, Stanford University, Stanford, CA 94305 (United States)]
 
Abstract: Ignition delay times were measured for gas-phase jet fuel (Jet-A and JP-8) in air behind reflected shock waves in a heated high-pressure shock tube. Initial reflected shock conditions were as follows: temperatures of 715-1229 K, pressures of 17-51 atm, equivalence ratios of 0.5 and 1, and oxygen concentrations of 10 and 21% in synthetic air. Ignition delay times were measured using sidewall pressure and OH* emission at 306 nm. Longer ignition delay times at low temperatures (715-850 K) were accessed by utilizing driver-gas tailoring methods. Also presented is a review of previous ignition delay time measurements of kerosene-based fuels and recent work on surrogate fuel and kinetic mechanism development. To our knowledge, we report the first gas-phase shock tube ignition delay time data for JP-8, and our measurements for Jet-A are for a broader range of conditions than previously available. Our results have very low scatter and are in excellent agreement with the limited previous shock tube data for Jet-A. Although JP-8 and Jet-A have slightly different compositions, their ignition delay times are very similar. A simple 1/P dependence was found for ignition delay times from 874 to 1220 K for the pressure range studied for both fuels. Ignition delay time variations with equivalence ratio and oxygen concentration were also investigated. The new experimental results were compared with predictions of several kinetic mechanisms, using different jet fuel surrogate mixtures. (author)
Publication Date: 15 Jan 2008
Resource Type: Journal Article
Resource Relation: Journal: Combustion and Flame; Journal Volume: 152; Journal Issue: 1-2; Other Information: Elsevier Ltd. All rights reserved
Country of Publication: United States
Language: English
Keywords relating to this report:
AIR
COMBUSTION KINETICS
FORECASTING
IGNITION
JET ENGINE FUELS
KEROSENE
MIXTURES
OXYGEN
PRESSURE DEPENDENCE
PRESSURE RANGE MEGA PA 10-100
REVIEWS
SHOCK TUBES
SHOCK WAVES
TEMPERATURE COEFFICIENT
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TIME DELAY
VARIATIONS