Effect of structure parameters of the flow guide vane on cold flow characteristics in trapped vortex combustor

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• 作者：Zhi-kai WANG ((王志凯))^a ; ^{nhwzk12@126.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Zhuo-xiong ZENG ((曾卓雄))^b ; ^{zengzhuoxiong@tsinghua.org.cn" class="auth_mail" title="E-mail the corresponding author} ; Kai LI ((李凯))^c ; Yi-hua XU ((徐义华))^c
• 关键词：trapped vortex combustor (TVC) ; dual-vortex ; flow guide vane ; structural parameters ; numerical simulation
• 刊名：Journal of Hydrodynamics, Ser. B
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：27
• 期：5
• 页码：730-737
• 全文大小：2010 K

文摘

The cold flow characteristics are investigated to show the effect of the structural parameters of the flow guide vane on the trapped vortex combustor (TVC). The results show that the structural parameters have significant effects on the TVC. As a/H increases, the total pressure loss, the wall shear stress at the bottom of the cavity and the turbulent intensity in the main combustion zone increase. b/B does not have a significant effect on the cavity flow structure and the total pressure loss, and the wall shear stress at the bottom of the cavity increases as increases. There is no significant increase of the turbulent intensity with the increase of b/B. The increase of c/L has little effect on the total pressure loss, and it is not conducive to a stable combustion. As c/L increases, the wall shear stress at the bottom of the cavity decreases. When a/H = 0.4, b/B = 0.4, c/L = 0.1, a desirable dual-vortex structure is formed with an acceptable pressure loss to achieve a stable combustion. Moreover, to ascertain that the flame is stable for different values of V_ma with the optimal structural parameters, the effect of V_ma on the flow field is discussed. Results suggest that the dual-vortex structure has no relationship with the increase of V_ma. Furthermore, an unsteady simulation is conducted to show the generation and the development of the dual-vortex.