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Title: Liftoff characteristics of partially premixed flames under normal and microgravity conditions

Abstract

An experimental and computational investigation on the liftoff characteristics of laminar partially premixed flames (PPFs) under normal (1-g) and microgravity ({mu}-g) conditions is presented. Lifted methane-air PPFs were established in axisymmetric coflowing jets using nitrogen dilution and various levels of partial premixing. The {mu}-g experiments were conducted in the 2.2-s drop tower at the NASA Glenn Research Center. A time-accurate, implicit algorithm that uses a detailed description of the chemistry and includes radiation effects is used for the simulations. The predictions are validated through a comparison of the flame reaction zone topologies, liftoff heights, lengths, and oscillation frequencies. The effects of equivalence ratio, gravity, jet velocity, and radiation on flame topology, liftoff height, flame length, base structure, and oscillation frequency are characterized. Both the simulations and measurements indicate that under identical conditions, a lifted {mu}-g PPF is stabilized closer to the burner compared with the 1-g flame, and that the liftoff heights of both 1-g and {mu}-g flames decrease with increasing equivalence ratio and approach their respective nonpremixed flame limits. The liftoff height also increases as the jet velocity is increased. In addition, the flame base structure transitions from a triple- to a double-flame structure as the flame liftoff heightmore » decreases. A modified flame index is developed to distinguish between the rich premixed, lean premixed, and nonpremixed reaction zones near the flame base. The 1-g lifted flames exhibit well-organized oscillations due to buoyancy-induced instability, while the corresponding {mu}-g flames exhibit steady-state behavior. The effect of thermal radiation is to slightly decrease the liftoff heights of both 1-g and {mu}-g flames under coflow conditions.« less

Authors:
; ;  [1];  [2];  [3];  [4]
  1. Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607 (United States)
  2. Department of Mechanical & Aerospace Engineering, Princeton University, Princeton, NJ 08544 (United States)
  3. Department of Engineering Science and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061 (United States)
  4. National Center for Microgravity Research, Cleveland, OH 44135 (United States)
Publication Date:
OSTI Identifier:
20677727
Resource Type:
Journal Article
Resource Relation:
Journal Name: Combustion and Flame; Journal Volume: 143; Journal Issue: 3; Other Information: Elsevier Ltd. All rights reserved
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; GRAVITATIONAL FIELDS; AIR; METHANE; FLAMES; COMBUSTION KINETICS; COMPUTERIZED SIMULATION; JETS; OSCILLATIONS

Citation Formats

Lock, Andrew J., Briones, Alejandro M., Aggarwal, Suresh K., Qin, Xiao, Puri, Ishwar K., and Hegde, Uday. Liftoff characteristics of partially premixed flames under normal and microgravity conditions. United States: N. p., 2005. Web. doi:10.1016/j.combustflame.2005.05.011.
Lock, Andrew J., Briones, Alejandro M., Aggarwal, Suresh K., Qin, Xiao, Puri, Ishwar K., & Hegde, Uday. Liftoff characteristics of partially premixed flames under normal and microgravity conditions. United States. doi:10.1016/j.combustflame.2005.05.011.
Lock, Andrew J., Briones, Alejandro M., Aggarwal, Suresh K., Qin, Xiao, Puri, Ishwar K., and Hegde, Uday. Tue . "Liftoff characteristics of partially premixed flames under normal and microgravity conditions". United States. doi:10.1016/j.combustflame.2005.05.011.
@article{osti_20677727,
title = {Liftoff characteristics of partially premixed flames under normal and microgravity conditions},
author = {Lock, Andrew J. and Briones, Alejandro M. and Aggarwal, Suresh K. and Qin, Xiao and Puri, Ishwar K. and Hegde, Uday},
abstractNote = {An experimental and computational investigation on the liftoff characteristics of laminar partially premixed flames (PPFs) under normal (1-g) and microgravity ({mu}-g) conditions is presented. Lifted methane-air PPFs were established in axisymmetric coflowing jets using nitrogen dilution and various levels of partial premixing. The {mu}-g experiments were conducted in the 2.2-s drop tower at the NASA Glenn Research Center. A time-accurate, implicit algorithm that uses a detailed description of the chemistry and includes radiation effects is used for the simulations. The predictions are validated through a comparison of the flame reaction zone topologies, liftoff heights, lengths, and oscillation frequencies. The effects of equivalence ratio, gravity, jet velocity, and radiation on flame topology, liftoff height, flame length, base structure, and oscillation frequency are characterized. Both the simulations and measurements indicate that under identical conditions, a lifted {mu}-g PPF is stabilized closer to the burner compared with the 1-g flame, and that the liftoff heights of both 1-g and {mu}-g flames decrease with increasing equivalence ratio and approach their respective nonpremixed flame limits. The liftoff height also increases as the jet velocity is increased. In addition, the flame base structure transitions from a triple- to a double-flame structure as the flame liftoff height decreases. A modified flame index is developed to distinguish between the rich premixed, lean premixed, and nonpremixed reaction zones near the flame base. The 1-g lifted flames exhibit well-organized oscillations due to buoyancy-induced instability, while the corresponding {mu}-g flames exhibit steady-state behavior. The effect of thermal radiation is to slightly decrease the liftoff heights of both 1-g and {mu}-g flames under coflow conditions.},
doi = {10.1016/j.combustflame.2005.05.011},
journal = {Combustion and Flame},
number = 3,
volume = 143,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 2005},
month = {Tue Nov 01 00:00:00 EST 2005}
}