Numerical Study of Operability of Combustor With Inflow Oscillations

Energy Conversion Pub Date : 2002-01-01 DOI:10.1115/IMECE2002-39294

K. Su, Chenn Q. Zhou

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Abstract

Numerical study of gas turbine combustion with the inflow oscillation has been conducted using KIVA-3V code. The simulation was based on the solution of Navier-Stokes equations with a time-marching method and models of turbulence and sprays, and a simplified kinetic mechanism of 17-species and 23-step. The transient inflow was assumed by specifying the pressure oscillation in a form of sinusoidal function. Effects of three flow patterns, i.e. quasi-steady, transition and steady patterns corresponding to the oscillation frequency ranges of n ≤ 80, 80 ≤ n ≤ 320 and n ≥ 320 Hz, on combustion performance were investigated. It is found that for the flow in quasi-steady pattern, combustion is in quasi-steady state with flow and combustion properties dependent of time and the analytical approaches for steady combustion can be applied; for the flow in steady pattern, combustion can be treated as if in steady state and the influence of oscillation can be ignored; and in transition pattern, the combustion behaves in-between. Finally, the operability of combustor with inflow oscillation was analyzed, which is useful for the analysis of combustion performance under irregular inflow conditions.Copyright © 2002 by ASME

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燃烧室入流振荡可操作性的数值研究

采用KIVA-3V程序对燃气轮机燃烧过程进行了数值模拟研究。采用时间推进法求解Navier-Stokes方程，建立湍流和喷雾模型，简化了17种23步的动力学机制。通过将压力振荡指定为正弦函数的形式来假设瞬时流入。研究了振荡频率n≤80hz、80≤n≤320 Hz和n≥320hz对应的准稳态、过渡和稳态三种流动模式对燃烧性能的影响。研究发现，准定常流态下，燃烧处于准定常状态，流动和燃烧性质随时间变化，可以应用定常燃烧的分析方法;对于定常流态，燃烧可以视为定常流态，振荡的影响可以忽略;在过渡模式中，燃烧在两者之间。最后，分析了燃烧室在入流振荡条件下的可操作性，为分析非规则入流条件下的燃烧性能提供了依据。ASME版权所有©2002

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Energy Conversion

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