To promote the efficiency of non-premixed combustion, we designed slot structures with a simple geometry on the side of a conical burner named a shuttlecock-like conical burner. The slot structure which can introduce the air co-flow naturally into the cone instead of using other and complicated geometry is inspired from the particular shape of a shuttlecock serving as a missile in badminton sport. Therefore, the air co-flow not only produces a recirculation zone on the edge of the burner but also moves directly into the burner. The combustion condition transforms from non-premixed to partially premixed combustion; the mixing and reaction of fuel and oxidant are hence greatly enhanced. We observed the structures of the flame and the flow of a shuttlecock-like conical burner, and examined its reaction characteristics with measurements of the chemiluminescence of OH* and the flame temperature. The observation of an isothermal flow field demonstrates that the air co-flow moves directly into the burner via the slots. Double pairs of vortex structures are observed above the exit of the burner because the introduced air co-flow decreases the strength of the outer vortex, allowing the central jet to form an inner vortex. The reaction zone of a shuttlecock-like conical burner hence approaches not only the central region of the flame but also the burner exit. The reaction intensity of the fuel of a shuttlecock-like conical burner is also stronger than that of an ordinary conical burner (without the slots). The designed shuttlecock-like conical burner is significantly useful to serve as a reference to improve the combustion efficiency of non-premixed combustion.

为了提高非预混燃烧的效率，我们在锥形燃烧器的侧面设计了具有简单几何形状的槽结构，称为毽子状锥形燃烧器。可以将空气合流自然地引入锥体的槽结构，而不是使用其他复杂的几何形状，其灵感来自羽毛球运动中作为导弹的羽毛球的特殊形状。因此，空气合流不仅在燃烧器边缘产生再循环区，而且直接进入燃烧器。燃烧工况由非预混燃烧转变为部分预混燃烧；燃料和氧化剂的混合和反应因此大大增强。我们观察了火焰的结构和类似羽毛球的锥形燃烧器的流动，并通过测量 OH* 的化学发光和火焰温度来检查其反应特性。对等温流场的观察表明，空气合流通过狭缝直接进入燃烧器。在燃烧器出口上方观察到双对涡流结构，因为引入的空气合流降低了外涡流的强度，使中心射流形成了内涡流。因此，羽毛球状锥形燃烧器的反应区不仅接近火焰的中心区域，而且接近燃烧器出口。羽毛球形锥形燃烧器的燃料反应强度也比普通锥形燃烧器（无槽）强。