核动力工程
覈動力工程
핵동력공정
NUCLEAR POWER ENGINEERING
2009年
z1期
18-22,38
,共6页
杨伟焱%吴宏春%曹良志%郑友琦
楊偉焱%吳宏春%曹良誌%鄭友琦
양위염%오굉춘%조량지%정우기
中子输运%小波%连续能量%共振自屏蔽计算
中子輸運%小波%連續能量%共振自屏蔽計算
중자수운%소파%련속능량%공진자병폐계산
Neutron transport%Wavelet%Continuous-energy%Resonance self-shielding calculation
小波展开能够很好地拟合剧烈变化的函数,近年来已被应用于模拟中子角注量率随角度剧烈变化的问题,并取得了令人满意的结果.中子能谱在共振区具有剧烈震荡的特性,本文介绍了利用能群与小波尺度函数展开相耦合来离散连续能量中子输运方程中能量自变量的方法.对中子注量率在共振区关于能量用小波尺度函数进行拟合,而在快中子区和热中子区利用分群计算的方法.初步的数值结果表明,该方法使有效增殖系数计算精确,并能够得到中子注量率在共振区随能量的精细分布,对共振自屏蔽的精确计算具有重要意义.
小波展開能夠很好地擬閤劇烈變化的函數,近年來已被應用于模擬中子角註量率隨角度劇烈變化的問題,併取得瞭令人滿意的結果.中子能譜在共振區具有劇烈震盪的特性,本文介紹瞭利用能群與小波呎度函數展開相耦閤來離散連續能量中子輸運方程中能量自變量的方法.對中子註量率在共振區關于能量用小波呎度函數進行擬閤,而在快中子區和熱中子區利用分群計算的方法.初步的數值結果錶明,該方法使有效增殖繫數計算精確,併能夠得到中子註量率在共振區隨能量的精細分佈,對共振自屏蔽的精確計算具有重要意義.
소파전개능구흔호지의합극렬변화적함수,근년래이피응용우모의중자각주량솔수각도극렬변화적문제,병취득료령인만의적결과.중자능보재공진구구유극렬진탕적특성,본문개소료이용능군여소파척도함수전개상우합래리산련속능량중자수운방정중능량자변량적방법.대중자주량솔재공진구관우능량용소파척도함수진행의합,이재쾌중자구화열중자구이용분군계산적방법.초보적수치결과표명,해방법사유효증식계수계산정학,병능구득도중자주량솔재공진구수능량적정세분포,대공진자병폐적정학계산구유중요의의.
Wavelets expansion method can simulate the functions oscillating violently. It has been applied to simulate the violently variety of the angular flux, and has obtained satisfactory results. Neutron spectrum has violent oscillations within the resonant energy range. This paper introduces a method to discretize the energy variable of neutron transport equation by coupling the multi-group method and wavelets expansion method, which simulates the energy-dependent angular flux with wavelets scaling function within the resonant energy range and uses multi-group method within fast and thermal neutron energy ranges. The preliminary calculation results indicate that this method can obtain the accurate k-inf, as well as determine the fine-structure energy distribution of the angular flux, which is significant to resonance self-shielding calculation.