权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of New and High Performance Combustor with Low CO_2 Emission

新型高性能低CO_2排放燃烧器的研制

基本信息

批准号：
10555063
负责人：
TAKITA Kenichi
金额：
$ 6.08万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

Theoretical and experimental investigations were conducted for development of new and high performance combustor with low CO_2 emission. The effect of an addition of CO_2, which absorbed the emission of flame to the unburned gas, on flammability limit and burning velocity was mainly investigated as a model of lean burning technology by using the re-circulation of burnt gas. In the numerical analysis, the reabsorption of radiation emitted from a flame resulted in broader flammability limit and larger burning velocity than those of the adiabatic flame. The burning velocity of the mixture including 10% CO_2 became larger than that of the mixture with no CO_2. Moreover, it was revealed in the analysis that the effect of radiation reabsorption more strongly appeared under high pressure condition than atmospheric pressure because of decrease in the optical thickness at high pressure.Extinction limit of counterflow premixed flame with CO_2 addition was experimentally measured in a high pressure vessel to verify the above theoretical results. Stretch rates at extinction monotonically decreased with the pressure and the concentration of CO_2, and the ratio of decrease was almost same for any condition. Therefore, the effect of radiation reabsorption was small under conditions of the experiment(0.5MPa(pressure), 15mm(diameter of burner)). On the other hand, strong instability of the flame surface due to a hydrodynamic instability at high pressure appeared in the experiment. Therefore, a consideration to such instability is important for a design of combustor used under high pressure condition.

为开发新型高性能低co2排放燃烧室进行了理论和实验研究。以燃烧后气体再循环稀薄燃烧技术为模型，研究了在未燃烧气体中加入吸收火焰的CO_2对燃烧极限和燃烧速度的影响。在数值分析中，与绝热火焰相比，火焰对辐射的重吸收使得燃烧极限更宽，燃烧速度更大。含有10% CO_2的混合物的燃烧速度比不含CO_2的混合物的燃烧速度大。此外，分析还表明，高压条件下由于光学厚度的减小，辐射重吸收效应比常压条件下更为强烈。在高压容器中实验测量了CO_2加入后的逆流预混火焰的熄灭极限，验证了上述理论结果。消光处的拉伸速率随压力和CO_2浓度的增加而单调减小，且减小的幅度在任何条件下几乎相同。因此，在实验条件下（0.5MPa（压力），15mm（燃烧器直径）），辐射重吸收的影响很小。另一方面，实验中由于高压下的流体动力不稳定性，火焰表面出现了较强的不稳定性。因此，考虑这种不稳定性对高压条件下燃烧室的设计是很重要的。