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Study on the combustion mechanism of molten sodium

熔融钠燃烧机理研究

基本信息

批准号：
13450082
负责人：
YOSHIZAWA Yoshio
金额：
$ 9.22万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450082/
关键词：
sodium pool combustion counter flow diffusion flame aerosol radiation heat transfer

项目摘要

The combustion of melting sodium is difficult and different from flame phenomenon widely known in the conventional basic combustion science because product is a solid phase. (1) There appears suction on the reaction zone. (2) The process of diffusion and removal of the solid phase product from the reaction zone is complicated. (3) The radiation heat transfer by the solid phase product has an important effect. In this study, the combustion of sodium is clarified from the viewpoint of the basic combustion science. The behavior of the radiation heat transfer by floating solid phase product (aerosol) was examined in detail and the effect of the radiation heat transfer by aerosol is discussed widely. The radiation heat transfer model based on the transport equation as an absorbing emitting medium was used. The followings were clarified by the numerical analysis based on above discussions ; surface combustion rate and flame height from the sodium pool, the effects of melting sodium temperature, atmosphere temperature, atmosphere oxygen concentration and emissivity of sodium surface. A sophisticate experimental sodium combustor was made. It is substantially a counter flow diffusion flame burner. The burner is surrounded with a pair of honeycomb which composes a radiation feedback burner. The premixed flame of the methane is formed on the honeycomb surface and the space between honeycomb is kept as a controlled high radiation field. Counter flow diffusion flames on the melting sodium pool surface were observed. The results agreed approximately with the analysis. In addition, an axi-symmetric flow field near the stagnation point of the counter flow was analyzed including detailed examination of the aerosol. The phenomena was clarified by comparing with the experimental results.

熔融钠的燃烧是困难的，不同于传统基础燃烧科学中广为人知的火焰现象，因为产物是固相。(1)反应区有吸力。(2)固相产物从反应区扩散和去除的过程比较复杂。(3)固相产物的辐射换热起着重要作用。本研究从基础燃烧科学的角度对钠的燃烧进行了阐述。详细研究了悬浮固相产物(气溶胶)的辐射换热行为，并对气溶胶辐射换热的影响进行了广泛的讨论。采用基于输运方程的辐射换热模型作为吸收发射介质。在以上讨论的基础上，通过数值分析，明确了表面燃烧速率和钠池火焰高度、熔融钠温度、大气温度、大气氧浓度和钠表面发射率的影响。制作了一台精密的钠燃烧器实验台。它基本上是一种逆流扩散火焰燃烧器。燃烧器周围环绕着一对蜂窝，组成辐射反馈燃烧器。在蜂窝表面形成甲烷预混火焰，保持蜂窝之间的空间为受控的高辐射场。在熔融的钠池表面观察到逆流扩散火焰。计算结果与分析结果基本吻合。此外，还对逆流驻点附近的轴对称流场进行了分析，包括气溶胶的详细检测。通过与实验结果的比较，阐明了这一现象。