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53743065

Experiments were carried out to investigate the performance of an inverse diffusion flame (IDF) with circumferentially arranged ports (CAP) and burning butane. Flame appearance, temperature distribution and the emission characteristics of the flame were reported in this paper. The burner was made up of one central air jet and twelve fuel jets distributed circumferentially around the air jet, with a centre-to-centre distance of 11mm between the air jet and the fuel jets. The air jet with a relatively higher jet velocity entrains the fuel from the surrounding jets towards the centre to form special flame shape which are different from the normal premixed and diffusion flames. The flame consists of two zones: an entrainment zone attached to the burner and a mixing and combustion zone on top of it. The highest temperature was found to be located away from the center at low equivalence ratio and shifted towards the center at higher equivalence ratio. In the emission measurements, the EINOx with air jet Re = 2500 were reported. For equivalence ratios at the range of 1.0≤Φ≤6.0, the EINOx curve was bell-shaped with the peak EINOx value occurring at Φ = 1.2.

qinsdau

Experiments were carried out to investigate the performance of an inverse diffusion flame (IDF) with circumferentially arranged ports (CAP) and burning butane. Flame appearance, temperature distribution and the emission characteristics of the flame were reported in this paper. The burner was made up of one central air jet and twelve fuel jets distributed circumferentially around the air jet, with a centre-to-centre distance of 11mm between the air jet and the fuel jets. The air jet with a relatively higher jet velocity entrains the fuel from the surrounding jets towards the centre to form special flame shape which are different from the normal premixed and diffusion flames. The flame consists of two zones: an entrainment zone attached to the burner and a mixing and combustion zone on top of it. The highest temperature was found to be located away from the center at low equivalence ratio and shifted towards the center at higher equivalence ratio. In the emission measurements, the EINOx with air jet Re = 2500 were reported. For equivalence ratios at the range of 1.0≤Φ≤6.0, the EINOx curve was bell-shaped with the peak EINOx value occurring at Φ = 1.2.
这里用一环状喷火口（CAP），以丁烷为燃料来研究反扩散火焰（IDF）的特性。可以得出包括火焰形状、温度分布及放射特性等特征参数。此CAP燃烧器包括中间的一个出气口，以及距中心11mm成环状分布的12个燃料口。此装置中心的气口喷速较大以与燃料口配合形成不同于一般预混燃料以及扩散火焰的特殊火焰形状。此处，火焰包括两个区域，一个是位于喷口附近的输入区，一个是上部的混合、燃烧区。试验发现温度最高区不在中心，而且中心附近的区域比远离中心的区域燃烧当量比要低。放射测定中气口的EINOx=2500 。绘制出1.0≤Φ≤6.0范围内的当量比曲线呈钟形且其EINOx值顶点位于Φ = 1.2处。

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