Numerical Study On Combustion Characteristics Of Partially Premixed Tubular Flame Burner For DME
Numerical Study On Combustion Characteristics Of Partially Premixed Tubular Flame Burner For DME
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DOI：
10.1080/00102202.2018.1498486
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发表时间：
2018-08
影响因子：
1.9
通讯作者：
S. Ren;Haolin Yang;Liqiao Jiang;Daiqing Zhao;Xiaohan Wang
中科院分区：
文献类型：
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作者：
S. Ren;Haolin Yang;Liqiao Jiang;Daiqing Zhao;Xiaohan Wang
摘要对二甲醚在部分预混管式火焰燃烧器中的燃烧特性进行了数值研究。研究了在不同当量比和入口速度条件下管状火焰的组分分布、稳定极限、壁面温度和燃尽率。同时，对快速混合管式火焰燃烧器的相应燃烧特性进行了模拟和比较。结果表明，部分预混燃烧器形成了独特的组分分布，燃料和氧化剂混合不均匀。这种独特的组分分布将促进化学焓通过中心回流向火焰前缘的供应，从而强化燃烧过程。基于这种独特的组分分布，部分预混燃烧器具有更大的管状火焰稳定极限，更低的热损失和更高的燃尽率，特别是在稀薄工况下。通过对两种燃烧器中管状火焰形成机理的比较，发现部分预混燃烧器形成的是部分预混管状火焰，不需要形成均匀的预混气体区，从而抑制了快速混合燃烧器中燃料和氧化剂速度差的影响。
ABSTRACT The combustion characteristics of dimethyl ether (DME) in a partially premixed tubular flame burner have been investigated numerically. The species distribution, stability limit of tubular flame, wall temperature and burn-off rate have been studied at different equivalence ratios and inlet velocities. Meanwhile, the corresponding combustion characteristics in the rapidly mixed tubular flame burner have been simulated and compared. The results show that the partially premixed burner forms a unique species distribution and the fuel and the oxidant are not mixed uniformly. This unique species distribution will promote the chemical enthalpy supply to the flame front by recirculation reverse flow in the center, and thus strengthen the combustion process. Based on this unique species distribution, the partially premixed burner has larger tubular flame stability limit, lower heat loss, and higher burn-off rate, especially for lean operating conditions. Comparing the formation mechanisms of the tubular flames in two types of burners, it is found that the partially premixed burner forms partially premixed tubular flame, which is no need to create a uniform premixed gas zone, thereby suppressing the influence of velocity difference between fuel and oxidant present in the rapidly mixed burner.