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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.1; 20060506-11; Barcelona(ES) >AN ACOUSTIC ENERGY APPROACH TO MODELING COMBUSTION OSCILLATIONS
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AN ACOUSTIC ENERGY APPROACH TO MODELING COMBUSTION OSCILLATIONS

机译：用于模拟燃烧振动的声学能量方法

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摘要

A new approach for modeling combustion instabilities using acoustic energy conservation is proposed. This approach allows the flexibility to calculate contributions from amplification and/or attenuation across all frequencies, rather than predicting eigenmodes. It is likely that such a direct acoustic energy approach could be of benefit in determining the susceptibility of all frequencies to growth or decay as operating conditions in a gas turbine change. This approach may also give designers a method for improving passive damping in the initial design phase, with the ability to scan various frequencies and investigate the susceptibility to oscillatory instability at different operating conditions. A linear model, including linear approximations to nonlinear processes, is introduced whereby the mechanisms contributing to amplification and damping of acoustic energy are assessed independently to find a net amplification coefficient, a reciprocal time (or a rate). Stability for each frequency is assessed by examining a ratio between amplification and damping. It is anticipated that this effort may provide a useful new perspective on and enhanced prediction capability for combustion oscillatory instabilities.
机译：提出了一种利用声能守恒对燃烧不稳定性进行建模的新方法。这种方法允许灵活地计算来自所有频率上的放大和/或衰减的贡献，而不是预测本征模。当燃气轮机的运行条件发生变化时，这种直接的声能方法可能会有利于确定所有频率对增长或衰减的敏感性。这种方法还可以为设计人员提供一种在初始设计阶段改善无源阻尼的方法，使其能够扫描各种频率并研究在不同工作条件下对振荡不稳定的敏感性。引入了一个线性模型，包括对非线性过程的线性近似，从而可以独立评估有助于放大和衰减声能的机制，以找到净放大系数，倒数时间（或比率）。通过检查放大率和阻尼之间的比率来评估每个频率的稳定性。可以预期，这种努力可以为燃烧振荡的不稳定性提供有用的新观点并增强其预测能力。

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