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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Traversing Hot-Jet Ignition in a Constant-Volume Combustor

[+] Author and Article Information
Abdullah Karimi

e-mail: akarimi@umail.iu.edu

Manikanda Rajagopal

e-mail: mrajagop@iupui.edu

Razi Nalim

e-mail: mnalim@iupui.edu
Purdue School of Engineering & Technology,
Indiana University–Purdue University,
Indianapolis, IN 46202

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 26, 2013; final manuscript received October 4, 2013; published online December 12, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(4), 041506 (Dec 12, 2013) (8 pages) Paper No: GTP-13-1325; doi: 10.1115/1.4025659 History: Received August 26, 2013; Revised October 04, 2013

Hot-jet ignition of a combustible mixture has application in internal combustion engines, detonation initiation, and wave rotor combustion. Numerical predictions are made for ignition of combustible mixtures using a traversing jet of chemically active gas at one end of a long constant-volume combustor (CVC) with an aspect ratio similar to a wave rotor channel. The CVC initially contains a stoichiometric mixture of ethylene or methane at atmospheric conditions. The traversing jet issues from a rotating prechamber that generates gaseous combustion products, assumed at chemical equilibrium for estimating major species. Turbulent combustion uses a hybrid eddy-breakup model with detailed finite-rate kinetics and a two-equation k-ω model. The confined jet is observed to behave initially as a wall jet and later as a wall-impinging jet. The jet evolution, vortex structure, and mixing behavior are significantly different for traversing jets, stationary centered jets, and near-wall jets. Pressure waves in the CVC chamber affect ignition through flame vorticity generation and compression. The jet and ignition behavior are compared with high-speed video images from a prior experiment. Production of unstable intermediate species like C2H4 and CH3 appears to depend significantly on the initial jet location while relatively stable species like OH are less sensitive.

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Figures

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Fig. 1

Constant-volume combustor rig

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Fig. 2

Geometry used for simulation (a) geometry used for the analysis (b) enlarged view of polyhedral mesh

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Fig. 3

High-speed video images of ignition of (a) Φ = 1 methane mixture in the main CVC chamber, for centered stationary jet [7]; (b) Φ = 0.8 methane mixture in the main CVC chamber for near-wall jet

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Fig. 12

CVC chamber-averaged molar concentration histories of OH and H intermediate species in the CVC chamber for stoichiometric methane mixture

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Fig. 11

CVC chamber-averaged molar concentration histories of (a) CH3 and (b) C2H4 intermediate species in the CVC chamber for stoichiometric methane mixture

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Fig. 10

OH mass fraction contours for methane mixture in (a) near-wall jet and (b) centered stationary jet

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Fig. 9

C2H4 mass fraction contours for methane mixture at (a) 8.1 ms traverse jet, (b) 3.1 ms traverse jet, (c) near-wall jet, and (d) centered stationary jet

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Fig. 8

Temperature levels for methane mixture for (a) 8.1 ms traverse, (b) 3.1 ms traverse, (c) near wall, and (d) centered stationary

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Fig. 7

CVC chamber-average fuel consumption rate for traversing jests and centered stationary jet for stoichiometric methane-air mixture

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Fig. 6

CVC chamber-averaged fuel consumption rate for traversing jets and centered stationary jet for stoichiometric ethylene-air mixture

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Fig. 5

History of temperature levels for ethylene (left) and methane (right in stoichiometric mixtures for near-wall jet

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Fig. 4

History of fuel mass fraction for ethylene (left) and methane (right) in stoichiometric mixtures for near-wall jet

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