Self-tuning regulators for combustion oscillations
Self-tuning regulators for combustion oscillations
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DOI：
10.1098/rspa.2002.1085
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发表时间：
2003-07-08
影响因子：
3.5
通讯作者：
Annaswamy, AM
中科院分区：
文献类型：
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作者：
Evesque, S;Dowling, AP;Annaswamy, AM
自激燃烧振荡是由非稳态燃烧和声波之间的耦合引起的，并且可以对许多燃烧系统造成结构损伤。主动控制提供了一种通过中断有害的热声相互作用来扩展系统稳定工作范围的方法。所考虑的主动控制器响应于检测到振荡的输入信号，将一些燃料不稳定地喷射到燃烧区域中，从而改变热释放速率。虽然这种控制配置的可行性在15年前的实验室规模的实验中得到了证明，但全面应用的三重要求是使控制器响应适应变化的操作条件，并保证控制器不会造成伤害，同时尽可能少地依赖于特定的燃烧模型。作为满足这些要求的第一步，本文提出了一种自校正调节器（STR）的一类燃烧系统，满足一些相当非限制性的假设。从控制器的输出电压驱动的致动器的压力信号检测的振荡的开环传递函数的推导，并示出的产品的时间延迟τ（tot）和满足一定的结构特性的传递函数。使用开环传递函数，它表明，稳定STR结构是一个简单的相位超前补偿器，如果τ（tot）= 0，和相同的补偿器与史密斯控制器相结合，如果τ（tot）不等于0。STR参数的调整的自适应规则来自李雅普诺夫稳定性分析。基于非线性预混火焰模型的模拟和由Rijke管中层流火焰燃烧组成的实验装置上获得了令人满意的结果。
Self-excited combustion oscillations arise from a coupling between unsteady combustion and acoustic waves, and can cause structural damage to many combustion systems. Active control provides a way of extending the systems' stable operating range by interrupting the damaging thermoacoustic interaction. The active controller considered injects some fuel unsteadily into the burning region, thereby altering the heat-release rate, in response to an input signal detecting the oscillation. Although the feasibility of such a control configuration was demonstrated on laboratory-scale experiments over 15 years ago, the triple requirement for full-scale applications is to adapt the controller response to varying operating conditions and to guarantee that the controller will cause no harm, while relying as little as possible on a particular combustion model. As a first step towards meeting these requirements, a self-tuning regulator (STR) is proposed in this paper for a class of combustion systems that satisfy some fairly non-restrictive assumptions. An open-loop transfer function from the controller output voltage driving the actuator to the pressure signal detecting the oscillation is derived, and is shown to be the product of a time delay tau(tot) and a transfer function that satisfies certain structural properties. Using the open-loop transfer function, it is shown that the stabilizing STR structure is that of a simple phase-lead compensator if tau(tot) = 0, and the same compensator combined with a Smith controller if tau(tot) not equal 0. The adaptive rule for the adjustment of the STR parameters is derived from a Lyapunov stability analysis. Promising results are obtained on a simulation based on a nonlinear premixed flame model and on an experimental set-up which consists of a laminar flame burning in a Rijke tube.