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Direct numerical simulation of the turbulent premixed flame propagation with radiation effects

机译:带有辐射效应的湍流预混火焰传播的直接数值模拟

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This paper investigates the effects of turbulence on radiative heat transfer in premixed flame propagation using a combination of direct numerical simulation (DNS) and the discrete ordinates method (DOM). The DNS code has been validated and established in previous research, and the newly written DOM code is validated by solving a sample radiative heat transfer problem. The DOM code is explicitly combined with the DNS code using the 3rd-order Runge-Kutta scheme. In the numerical experiments, an initially flat laminar premixed flame interacts with imposed turbulent fluctuations and evolves over time. A remarkable increase in the temperature self-correlation factor < T~4 > / < T>~4 is observed in the middle of the reaction. Higher u' conditions induced faster and more intensive flame wrinkle evolution. However, flow turbulence reduces the radiative heat loss in planar premixed flame due to the flame curvature effects.
机译:本文结合直接数值模拟(DNS)和离散纵坐标方法(DOM),研究了湍流对预混火焰传播中辐射热传递的影响。 DNS代码已在先前的研究中得到验证和建立,而新编写的DOM代码通过解决示例辐射热传递问题而得到验证。 DOM代码使用三阶Runge-Kutta方案与DNS代码显式组合。在数值实验中,最初为平面的层流预混火焰与强加的湍流相互作用,并随时间演变。在反应中间观察到温度自相关因子 / 〜4显着增加。较高的u'条件会导致火焰皱纹更快更密集地发展。然而,由于火焰曲率效应,流动湍流减小了平面预混火焰中的辐射热损失。

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