Conference proceeding
Fuel Composition Effects on Forced Ignition of Liquid Fuel Sprays
Volume 4B: Combustion, Fuels, and Emissions, Vol.4
ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, Oslo, Norway, Jun. 11 - 15, 2018 (Oslo, Norway, 06/11/2018–06/15/2018)
06/11/2018
Handle:
https://hdl.handle.net/2376/119663
Appears in Aviation Sustainability Center (ASCENT)
Abstract
In gas turbine combustors, ignition is achieved by using sparks from igniters to start a flame. The process of sparks interacting with fuel/air mixture and creating self-sustained flames is termed forced ignition. Physical and chemical properties of a liquid fuel can influence forced ignition. The physical effects manifest through processes such as droplet atomization, spray distribution, and vaporization rate. The chemical effects impact reaction rates and heat release. This study focuses on the effect of fuel composition on forced ignition of fuel sprays in a well-controlled flow with a commercial style igniter. A facility previously used to examine prevaporized, premixed liquid fuel-air mixtures is modified and employed to study forced ignition of liquid fuel sprays. In our experiments, a wall-mounted, high energy, recessed cavity discharge igniter operating at 15 Hz with average spark energy of 1.25 J is used to ignite liquid fuel spray produced by a pressure atomizer located in a uniform air coflow. The successful outcome of each ignition events is characterized by the (continued) presence of chemiluminescence 2 ms after spark discharge, as detected by a high-speed camera. The ignition probability is defined as the fraction of successful sparks at a fixed condition, with the number of events evaluated for each fuel typically in the range 600-1200. Ten fuels were tested, including standard distillate jet fuels (e.g., JP-8 and Jet-A), as well as many distillate and alternative fuel blends, technical grade n-dodecane, and surrogates composed of a small number of components. During the experiments, the air temperature is controlled at 27 C and the fuel temperature is controlled at 21 C. Experiments are conducted at a global equivalence ratio of 0.55. Results show that ignition probabilities correlate strongly to liquid fuel viscosity (presumably through droplet atomization) and vapor pressure (or recovery temperature), as smaller droplets of a more volatile fuel would lead to increased vaporization rates. This allows the kernel
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Details
- Title
- Fuel Composition Effects on Forced Ignition of Liquid Fuel Sprays
- Creators
- Sheng Wei - Georgia Institute of Technology, Atlanta, GABrandon Sforzo - Argonne National LaboratoryJerry Seitzman - Georgia Institute of Technology
- Publication Details
- Volume 4B: Combustion, Fuels, and Emissions, Vol.4
- Conference
- ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, Oslo, Norway, Jun. 11 - 15, 2018 (Oslo, Norway, 06/11/2018–06/15/2018)
- Academic Unit
- Aviation Sustainability Center (ASCENT); Alternative Jet Fuel
- Publisher
- American Society of Mechanical Engineers
- Grants
- 13-C-AJFE-GIT-008, Federal Aviation Administration (United States, Washington) - FAA
- Identifiers
- 99900620473501842
- Language
- English
- Resource Type
- Conference proceeding