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Appl. Sci. 2017, 7(6), 619; doi:10.3390/app7060619

Simulation Investigation on Combustion Characteristics in a Four-Point Lean Direct Injection Combustor with Hydrogen/Air

1
Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2
School of National Defense Engineering, PLA University of Science and Technology, 88 Biaoying Rd., Nanjing 210007, China
3
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-2088, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Elias K. Stefanakos and Sesha S. Srinivasan
Received: 5 May 2017 / Revised: 5 June 2017 / Accepted: 12 June 2017 / Published: 14 June 2017
(This article belongs to the Special Issue Clean Energy and Fuel (Hydrogen) Storage)
View Full-Text   |   Download PDF [10063 KB, uploaded 22 June 2017]   |  

Abstract

To investigate the combustion characteristics in multi-point lean direct injection (LDI) combustors with hydrogen/air, two swirl–venturi 2 × 2 array four-point LDI combustors were designed. The four-point LDI combustor consists of injector assembly, swirl–venturi array and combustion chamber. The injector, swirler and venturi together govern the rapid mixing of hydrogen and air to form the mixture for combustion. Using clockwise swirlers and anticlockwise swirlers, the co-swirling and count-swirling swirler arrays LDI combustors were achieved. Using Reynolds-Averaged Navier–Stokes (RANS) code for steady-state reacting flow computations, the four-point LDI combustors with hydrogen/air were simulated with an 11 species and 23 lumped reaction steps H2/Air reaction mechanism. The axial velocity, turbulence kinetic energy, total pressure drop coefficient, outlet temperature, mass fraction of OH and emission of pollutant NO of four-point LDI combustors, with different equivalence ratios, are here presented and discussed. As the equivalence ratios increased, the total pressure drop coefficient became higher because of increasing heat loss. Increasing equivalence ratios also corresponded with the rise in outlet temperature of the four-point LDI combustors, as well as an increase in the emission index of NO EINO in the four-point LDI combustors. Along the axial distance, the EINO always increased and was at maximum at the exit of the dump. Along the chamber, the EINO gradually increased, maximizing at the exit of chamber. The total temperature of four-point LDI combustors with different equivalence ratios was identical to the theoretical equilibrium temperature. The EINO was an exponential function of the equivalence ratio. View Full-Text
Keywords: gas turbine engine; lean direct injection; four-point; low emissions combustion gas turbine engine; lean direct injection; four-point; low emissions combustion
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MDPI and ACS Style

Li, J.; Yuan, L.; Mongia, H.C. Simulation Investigation on Combustion Characteristics in a Four-Point Lean Direct Injection Combustor with Hydrogen/Air. Appl. Sci. 2017, 7, 619.

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