Simulation of Premixed and Partially Premixed Jet-in-Crossflow Flames at High Pressure

Author:

Stiehl Bernhard1,Otero Michelle1,Genova Tommy1,Worbington Tyler1,Reyes Jonathan1,Martin Scott2,Velez Carlos3,Ahmed Kareem1

Affiliation:

1. Propulsion and Energy Research Laboratory, Center for Advanced Turbomachinery & Energy Research, Department of Mechanical and Aerospace Engineering, University of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816

2. Eagle Flight Research Center (EFRC), Embry-Riddle Aeronautical University (ERAU), 600 S Clyde Morris Blvd., Daytona Beach, FL 32114

3. General Electric Company, 1 Research Cir, Niskayuna, NY 12309

Abstract

Abstract In this paper, we explore the operational map of a lean axial-staged combustor of premixed and partially premixed reacting jet-in-crossflow flames at high -pressure (5 atm). This study attempts to expand the data to relatively high pressure and could significantly aid scaling to real gas turbine engine conditions at 20–30 atm. High-speed camera, particle image velocimetry (PIV), CH* chemiluminescence, temperature, and pressure measurements were taken and processed to allow accurate reconstruction of six operating points relative to computational fluid dynamics (CFD) simulations under minimal adjustments. Variation of lean main stage (φ = 0.575 and 0.73) and rich jet (φ = 1.1, 4, and 8) equivalence ratio has been investigated for a four mm axial jet. The fully premixed flames were found to be controlled by the crossflow temperature before ignition and the crossflow oxygen content during combustion. Analysis of flame shape and position for the partially premixed operating points describes a lee stabilized as well as a more unsteady windward flame branch. Adjustment of added jet fuel and crossflow temperature along with its corresponding oxygen level is required to attain a compact flame body. The risk of delaying combustion progress is significantly increased at a richer jet φ = 8 and an overshooting, spatially divided flame was attained with a main stage φ = 0.73. Control toward a compact flame body is critical to allow combustion at reasonable reaction rate.

Funder

U.S. Department of Energy

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Reference38 articles.

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