Influence of Random Excitations on Acoustic Instabilities in Combustion Chambers
Influence of Random Excitations on Acoustic Instabilities in Combustion Chambers
复制标题
随机激励对燃烧室声学不稳定性的影响
作者：
V. Burnley;F. Culick
虽然燃烧室中的流动含有相当大的噪声，这些噪声是由几种源引起的，但是把有组织的振荡当作不同的运动来处理是有充分的根据的。这是一个基本的假设，几乎在所有的燃烧不稳定性的处理中都是这样.然而，有组织的或确定性的运动的某些特征似乎具有随机过程的性质。例如，极限环中的振幅总是表现出随机性，甚至不稳定性的出现似乎偶尔也具有一些统计特征。因此，在随机源存在下的非线性相干运动的分析是该理论的重要组成部分。我们报告了一些结果有组织的振荡存在噪声。最显著的不足是，由于目前的理解水平低，噪声的随机源是以特设的方式建模的，并且没有建立在适合于燃烧室的坚实的物理基础上。
Although flows in combustors contain considerable noise, arising from several kinds of sources, there is a sound basis for treating organized oscillations as distinct motions. That has been an essential assumption incorporated in virtually all treatments of combustion instabilities. However, certain characteristics of the organized or deterministic motions seem to have the nature of stochastic processes. For example, the amplitudes in limit cycles always exhibit a random character, and even the occurrence of instabilities seems occasionally to possess some statistical features. Analysis of nonlinear coherent motions in the presence of stochastic sources is, therefore, an important part of the theory. We report a few results for organized oscillations in the presence of noise. The most significant deficiency is that, because of the low level of current understanding, the stochastic sources of noise are modeled in ad hoc fashion and are not founded on a solid physical basis appropriate to combustion chambers.