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Effects Of Position And Frequency Of Obstacles On Turbulent Premixed Propagating Flames

机译：障碍物的位置和频率对湍流预混传播火焰的影响

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This paper studies the effects of the number and location of solid obstacles on the rate of propagation of turbulent premixed flames. A vented explosion chamber is constructed where controlled premixed flames are ignited from rest to propagate past grids or baffles plates as well as other solid obstacles strategically positioned in the chamber. Laser Induced Fluorescence (LIF) is used to image OH which is used as an indicator of the reaction zone while pressure transducers are used to obtain pressure-time traces. Single grids or baffle plates located at different distances from the ignition source are tested. Two as well as three baffle plates are also investigated in varying configurations. It is found that while the peak overpressure increases with increasing number of grids or baffle plates, a limit is reached where the pressure starts to decrease. The location of the obstacles is found to have a significant effect on the overpressure and the flame structure. Higher overpressures are obtained when the baffle plates and obstacles are stacked closer together hence not allowing turbulence to decay. LIF images for OH show that the reaction zones become more contorted with increasing number of baffle plates in the flame path.
机译：本文研究了固体障碍物的数量和位置对湍流预混火焰传播速率的影响。构造了一个通风的爆炸室，从静止处点燃受控的预混火焰，使其传播通过格栅或挡板以及战略性放置在爆炸室中的其他固体障碍物。激光诱导荧光（LIF）用于对OH成像，该OH用作反应区的指示剂，而压力传感器则用于获取压力-时间曲线。对距点火源不同距离的单个格栅或挡板进行测试。还研究了两种以及三种不同配置的挡板。可以发现，尽管峰值超压随着格栅或挡板数量的增加而增加，但达到了压力开始降低的极限。发现障碍物的位置对超压和火焰结构有重大影响。当挡板和障碍物靠得更近时，会获得更高的超压，因此湍流不会衰减。 OH的LIF图像显示，随着火焰路径中挡板数量的增加，反应区变得更加扭曲。

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