Numerical Studies of Turbulence-Combustion Interactions in Diffusion Planes

“随机旋涡”方法被用来描述化学反应流动中湍流的产生和后来的行为。这种方法避免了定常假设，因为定态假设削弱了现有的湍流模型。尽管它有一些局限性，但它是反应流场数值分析中最有前途的步骤之一。将在不同的构型下测试大范围的雷诺数和佩克雷特数，以期识别和预测诸如稳定性、消光、火焰伸展、漩涡效应等临界现象。就目前的情况而言，大量的实验数据正在等待用于验证这种改进的综合数值模式。对于燃烧界来说，获得可靠的湍流反应流场预测模型一直是一个难以实现的目标。在过去的二十年里，已经尝试了许多简化的数值模型，但在一般情况下收效甚微。这种新方法引入了涡度作为湍流产生的一个基本方面；在早期，计算机性能的不足排除了这一重要的改进。该程序的成功开发将为提高计算机代码的灵活性和通用性开辟道路。

The method of "random vortices" is used to describe the generation and later behavior of turbulence in a chemically reacting flow. This method avoids the steady state assumption which weakens existing models of turbulence. Although it has some limitations, it is one of the most promising steps forward in the numerical analysis of reacting flow fields. An extensive range of Reynolds and Peclet numbers will be tested in various configurations, with a view to identify and predict such critical phenomena as stability, extinction, flame stretch, swirl effect, etc... As the field stands today, large sets of experimental data are waiting to be used for the verification of such improved comprehensive numerical models. The availability of a reliable predictive model in turbulent reacting flow fields has been an elusive goal to the combustion community. During the last twenty years a number of simplified numerical models have been tried but with little generic success. This new method introduces vorticity as a fundamental aspect of turbulence generation; in earlier times insufficient computer performance had ruled out this important refinement. Success in the development of this program would open the way for computer codes of increased flexibility and generality.