Scattering and Excitation of Acoustic Waves by Turbulent Flames

本文从理论上研究了湍流火焰对声波的激发和散射。 具体来说，它检查的声辐射特性的移动，回旋火焰的各种尺度的粗糙度的前线。 它还着眼于如何的空间和时间特性的散射和激发波可以被用来作为诊断湍流火焰前锋。 本研究采用耦合积分方程法来分析声场。 完整的解决方案需要两个这样的方程的解决方案，描述了火焰的上游和下游的领域，这是耦合的质量，动量和能量守恒条件。 在某些限制的情况下，得到解析解，而数值边界元方法用于分析棘手的情况下。 这一努力补充了由主要研究者获得的CAREER奖支持的相同现象的实验研究。

This is a theoretical investigation of the excitation and scattering of acoustic waves by turbulent flames. Specifically, it examines the acoustic radiation characteristics of moving, convoluted flame fronts of various scales of roughness. It also looks at how the spatial and temporal characteristics of the scattered and excited waves can be used as a diagnostic of turbulent flame fronts. The study uses a coupled integral equation approach to analyze the acoustic field. The complete solution requires the solution of two such equations, describing the field upstream and downstream of the flame, that are coupled by mass, momentum, and energy conservation conditions. Analytical solutions are obtained in certain limiting cases, while a numerical boundary-element approach is used for analytically intractable cases. This effort complements an experimental study of the same phenomena supported by a CAREER award to the principal investigator.