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RISS 인기검색어
- 검색키워드
- 저자 : Shusheng Zang (검색결과 2 건)
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Characteristic modes and flow structure of non-premixed flame in humid-air combustion
Zang Shusheng,Gu Xin,Ge Bing 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.2
and the flame stability limit in turbulent non-premixed flame. Two-dimensional Particle Image Velocimetry (PIV) meas-urements were made to quantify the velocity field, with and without steam injected. The results indicate the additionof steam decreases the recirculation flow and reduces the distance between the forward and aft stagnation points. Thedetailed stabilization regimes show that the critical fuel-to-air velocity ratios of the central fuel penetration in the humidair case are 16% to 22% lower, and the partially quenching limits are at least 25% lower. The decreased penetrationlimit is due to a reduction in momentum of the humid air. An analysis of flamelet concepts reveals that increased chem-
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Large-eddy simulation of low-swirl multi-nozzle combustion with co- and counter-swirling arrays
Weijie Liu,Bing Ge,Shusheng Zang,Huiru Wang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1
Large-eddy simulation (LES) of CH 4 -air low-swirl flame was carried out in a multi-nozzle combustor with two burner configurations by using a premixed flamelet model. The multi-nozzle burner includes a co-swirling array where all five nozzles act in the same direction and a counter-swirling array where the center nozzle is in the opposite swirling direction to the outer nozzles. LES results are in good agreement with OH-planar laser-induced florescence data in terms of OH concentrations and combustion progress variables. Numerical results show that the flow of each nozzle is constant before merging. The neighboring flows interact with each other and generate a highvelocity zone with intensive turbulence. The kinetic energy in the interacting region for the co-swirling array is larger than that for the counter-swirling array. After neighboring flow combining, the flow develops into a unified swirling motion similar to a single swirling flow for the co-swirling array, whereas the flow maintains the individual swirling structures for the counter-swirling arrangement. However, the swirling array exerts minimal effect on multi-nozzle combustion in terms of the temperature distributions and combustion progress of premixed low-swirl multi-nozzle flames.
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