Numerical Study of an Integrated Lean Premixed Prevaporized Low Nox Combustor PDF Download
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Author: Tsan-Hai Chue
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Author: Tsan-Hai Chue
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Author: Jacob Haseman
Publisher:
ISBN:
Category :
Languages : en
Pages : 109
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Current trends with swirler/combustor designs tend towards lower emissions in accordance with ICAO standards, with the main problems inherent in common lean-direct-injection (LDI) designs being poor stability and autoignition or flashback issues. The LDI design is meant to combine the good stability and performance of a traditional rich-burn quick-quench lean-burn (RQL) combustor with the ultra-low NOx emissions of a lean-premixed-prevaporized (LPP) combustor. The goal of this research is to investigate the feasibility of using swirlers with varying swirl strengths in an LDI combustor array by performing a series of combustion tests at atmospheric pressure. Three configurations were designed and tested which contained different arrangements of two counter-rotating radial-radial swirler designs with varying swirl strengths in a 3x3 array format. All nine swirlers contained a fuel nozzle with very similar flow numbers and were all set to the same insertion depth with respect to the swirlers' flare exits. Two nozzle insertion depths were investigated to see how the performance changes with changing insertion depth. Three fuel circuits supplied fuel to the nine fuel nozzles to the center, sides, and diagonal swirlers respectively. Testing was conducted by placing the hardware on a horizontally-oriented test rig connected to an air intake manifold, with the inlet air preheated to approximately 400°F and the pressure drop across the swirler set to 4% of atmospheric pressure. These tests investigated fuel staging configurations at various simulated engine throttle settings and flight conditions to gauge the steady-state combustion and LBO characteristics and low- NOx potential of this design. The results of this testing show that all three configurations tested were able to achieve stable-burning with low equivalence ratios for the three simulated flight conditions tested, as well as across a number of other investigated parameters. The two high-strength swirler configurations performed better than the baseline configuration in terms of LBO, stability, and flame uniformity, but all three configurations achieved stable combustion at comparable equivalence ratios to traditional combustor designs currently in use in industry. The low fuel flow rates required for ignition with the larger flow number fuel nozzles also demonstrates the practicality of this design in a real-world scenario. These tests also demonstrate that the deeper nozzle insertion depth performed better than the shallow insertion depth, and that future testing should focus on the high-strength swirler configurations.
Author:
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Category : Aeronautics
Languages : en
Pages : 542
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Author:
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ISBN:
Category :
Languages : en
Pages : 50
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 492
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Publisher: DIANE Publishing
ISBN: 1428918213
Category :
Languages : en
Pages : 251
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Author: J. M. Deur
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Category : Air
Languages : en
Pages : 18
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Author: Morgan I. Granger
Publisher:
ISBN:
Category : Combustion engineering
Languages : en
Pages : 144
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Author: Konrad Stefan Pausch
Publisher:
ISBN: 9783843944472
Category :
Languages : en
Pages :
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Author: A. Dasgupta
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ISBN:
Category :
Languages : en
Pages :
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