CAJ | 학술논문

该文采用蒙特卡洛方法研究包括吸收性气体和具有一定浓度颗粒的燃烧环境中的辐射传热.在蒙特卡洛程序被验证之后,研究了多重散射对辐射传热的影响.定义了一个临界颗粒体积份额fvc,作为区分单次散射区和多重散射区的分界.当颗粒云的体积份额位于单次散射区和多重散射区时,其辐射通量的变化表现出不同的行为.在单次散射区,平板的辐射通量随着离子浓度增加而剧烈增长,辐射行为受到颗粒单次散射的影响.在多重散射区,离子浓度的增加不会引起辐射通量的增长,辐射通量趋近于一个固定值,辐射行为受到气体吸收和多重散射的双重影响.
해문채용몽특잡락방법연구포괄흡수성기체화구유일정농도과립적연소배경중적복사전열.재몽특잡락정서피험증지후,연구료다중산사대복사전열적영향.정의료일개림계과립체적빈액fvc,작위구분단차산사구화다중산사구적분계.당과립운적체적빈액위우단차산사구화다중산사구시,기복사통량적변화표현출불동적행위.재단차산사구,평판적복사통량수착리자농도증가이극렬증장,복사행위수도과립단차산사적영향.재다중산사구,리자농도적증가불회인기복사통량적증장,복사통량추근우일개고정치,복사행위수도기체흡수화다중산사적쌍중영향.
To study radiative transfer in a participating medium composed of gas and particles, with arbitrary concentrations of particles, a Monte Carlo simulation has been developed. After validation by comparing with other methods,effects of multiple scattering on radiative transfer are investigated. A critical volume fraction fvc is defined to distinguish two radiative flux behaviors versus particles volume fractions : a single scattering zone and a multiple scattering zone. The emissive flux of the slab rises steeply and is dominated by gas and particle single scattering in the single scattering zone, while it approaches a constant value and is dominated by absorption and multiple scattering of particles in the multiple scattering zone.