南京航空航天大学学报（英文版）
南京航空航天大學學報（英文版）
남경항공항천대학학보（영문판）
TRANSACTIONS OF NANJING UNIVERSITY OF AERONATICS & ASTRONAUTICS
2008年
1期
11-17
,共7页
计算流体力学%辐射%热化学%非平衡
計算流體力學%輻射%熱化學%非平衡
계산류체역학%복사%열화학%비평형
computational fluid dynamics%radiation%thermochemistry%non-equilibrium
设计了耦合辐射的三维热化学非平衡流场计算方法,以适用于任意形状的网格.采用Jameson有限体积法求解耦合辐射源项的三维N-S方程.化学模型包含11个组元,20个化学反应.辐射源项通过直接求解辐射输运方程RTE获得.在空间和方向上分别离散后,利用有限体积法求解不同方向上的辐射输运方程,精确计算了波长为100-1 500 nm所有主要组元的吸收系数,逐条计算了目前已观测到的空气组元的原子谱线,而对分子的带状谱采用了带模型计算,并最终得到了驻点处辐射密度随波长变化的分布情况.
設計瞭耦閤輻射的三維熱化學非平衡流場計算方法,以適用于任意形狀的網格.採用Jameson有限體積法求解耦閤輻射源項的三維N-S方程.化學模型包含11箇組元,20箇化學反應.輻射源項通過直接求解輻射輸運方程RTE穫得.在空間和方嚮上分彆離散後,利用有限體積法求解不同方嚮上的輻射輸運方程,精確計算瞭波長為100-1 500 nm所有主要組元的吸收繫數,逐條計算瞭目前已觀測到的空氣組元的原子譜線,而對分子的帶狀譜採用瞭帶模型計算,併最終得到瞭駐點處輻射密度隨波長變化的分佈情況.
설계료우합복사적삼유열화학비평형류장계산방법,이괄용우임의형상적망격.채용Jameson유한체적법구해우합복사원항적삼유N-S방정.화학모형포함11개조원,20개화학반응.복사원항통과직접구해복사수운방정RTE획득.재공간화방향상분별리산후,이용유한체적법구해불동방향상적복사수운방정,정학계산료파장위100-1 500 nm소유주요조원적흡수계수,축조계산료목전이관측도적공기조원적원자보선,이대분자적대상보채용료대모형계산,병최종득도료주점처복사밀도수파장변화적분포정황.
A numerical method is developed based on an unstructured mesh to compute an ionized hypersonic flowfield with radiation in the thermo-chemical nonequilibrium. The flowfield is described by multi-species Navier-Stocks equations. The chemical model includes 11 species (O2,N2,O,N,NO,NO+,N+,O+,N+2,O+2,e-) and 20 reactions. For simulating the thermal non-equilibrium effect, the two-temperature model is considered. The finite volume method (FVM) used for the spatial and directional discretization of radiative transfer equation(RTE) is described for unstructured grids. The numerical code can handle different kinds of species and radiative bands in a gas thermodynamicly described by two temperatures. In particular, the Delta, Epsilon, Beta prime, and Gamma prime bands of NO are choosen and the distribution of the radiation intensity is obtained.
