In:
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, SAGE Publications, Vol. 236, No. 3 ( 2022-03), p. 527-540
Abstract:
Low swirl combustion (LSC) technology has the advantage of ultralow NO x emissions, which is of great significance to the development of low-emission gas turbine engines in the future. To investigate the flow field and flame structure characteristics of LSC, a test rig of low swirl burner was designed and developed. Particle image velocimetry measurement results show that the location and size of the recirculation zone are different, and the flow field shows typical “W”- and “U”-shaped distributions under various swirling flow conditions. The self-luminous results of LSC show that there are three flame modes including attached flame, “W”-shaped flame, and “U”-shaped flame. To deeply understand NO x generation pathways, a chemical reactor network model was developed based on experiments and computational fluid dynamics simulations, and the effects of premixed gas components on NO x pathways were calculated by using Chemkin software. It was verified that the NO x production of the CH 4 mixture mixed with H 2 , N 2 , and CO 2 was mainly formed by the thermal NO pathway in the recirculation zone. The increase of H 2 promotes the generation of NNH-type NO x in the main flame zone and inhibits prompt NO x . The addition of N 2 and CO 2 greatly promotes the generation of prompt NO x and at the same time inhibits NNH-type NO x . In addition, there is little prompt NO x formation in the post-flame zone.
Type of Medium:
Online Resource
ISSN:
0954-4100
,
2041-3025
DOI:
10.1177/09544100211016176
Language:
English
Publisher:
SAGE Publications
Publication Date:
2022
detail.hit.zdb_id:
2032759-6
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