Flame flickering frequency on a rotating Bunsen burner
Flame flickering frequency on a rotating Bunsen burner
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DOI：
10.1016/j.ces.2006.11.012
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发表时间：
2007-03-01
影响因子：
4.7
通讯作者：
Cheng, Robert K.
中科院分区：
文献类型：
--
作者：
Gotoda, Hiroshi;Ueda, Toshihisa;Cheng, Robert K.
Kostiuk和程[1995]提出的经验关联式(ST*(2)/Ri=0.00028Re*(2/3)：ST*是约化的Strouhal数，Ri是Richardson数，Re*是约化的雷诺数)。锥形褶皱层流火焰与重力的耦合。在旋转本生燃烧器产生的旋转流动条件下，对火焰闪烁频率随旋流数S的变化进行了实验研究。在S近似为0.1时的低旋条件下，火焰闪烁频率f(T)没有变化，而是随着燃烧器U的整体流速的增加而单调增加。[1995年。重力对预混火焰行为的一些影响。燃烧和火焰82，66-74]和Kostiuk和cheng(1995)，可以很好地与Kostiuk和cheng(1995)的经验关联式相吻合。然而，在高旋流条件下(S和gt；1)，f(T)显著下降，达到非旋流条件下的80%左右，并且变得对U不敏感，因此，S和gt；1下的数据不能用经验公式关联。从激光多普勒测速(LDV)的结果来看，这种不一致性是由于燃烧器出口和火焰尖端之间的速度分布随燃烧器旋转而变化所表现出的流动发散。燃烧器出口和火焰尖端之间的中心线速度u(J)，(Min)的最小值在控制火焰闪烁频率方面起着重要作用。通过修正的经验关联式ST*(2)/Ri=0.00028(Re*exp(-0.64S(1.78)(2/3)，该参数的使用允许将经验关联式扩展到大旋流情况。(C)2006年，爱思唯尔有限公司出版。
The empirical correlation (St*(2)/Ri = 0.00028Re*(2/3): St* is the reduced Strouhal number, Ri the Richardson number, Re* the reduced Reynolds number) proposed by Kostiuk and Cheng [1995. The coupling of conical wrinkled laminar flames with gravity. Combustion and Flame 103, 27-40] for predicting buoyancy-induced flame flickering frequency, has been experimentally investigated under the swirling flow conditions produced by a rotating Bunsen burner, focusing on how the flame flickering frequency changes with increasing swirl number S. Under low swirling conditions up to S approximate to 0.1, the flame flickering frequency f(t) did not change and monotonically increased with increasing the bulk flow velocity from the burner tube U. The trend of the data is similar to those obtained by Durox et al. [1995. Some effects of gravity on the behavior of premixed flames. Combustion and Flame 82, 66-74] and Kostiuk and Cheng (1995) and could be fitted well with the empirical correlation Kostiuk and Cheng (1995). However, under high swirling conditions (S > 1), f(t) significantly decreased up to approximate to 80% of that with non-swirling condition, and became insensitive to U. As a result, the data under S > 1 could not be correlated by the empirical equation. From results obtained by laser doppler velocimetry (LDV), this inconsistency is due to flow divergence shown by the change in the velocity distribution between the burner exit and the flame tip with burner rotation. A minimum value of the centerline velocity u(j),(min) between the burner exit and the flame tip fulfills an important role in controlling the flame flickering frequency. The use of this parameter allows the empirical correlation to be extended to the high swirling case by means of a modified empirical correlation St*(2)/Ri = 0.00028 (Re* exp(-0.64S(1.78)))(2/3). (c) 2006 Published by Elsevier Ltd.