原子能科学技术
原子能科學技術
원자능과학기술
ATOMIC ENERGY SCIENCE AND TECHNOLOGY
2014年
4期
604-609
,共6页
鲁晓东%周铃岚%巫英伟%苏光辉%秋穗正%张虹
魯曉東%週鈴嵐%巫英偉%囌光輝%鞦穗正%張虹
로효동%주령람%무영위%소광휘%추수정%장홍
轴向非均匀加热%并联通道%流动不稳定性%三维不稳定性空间
軸嚮非均勻加熱%併聯通道%流動不穩定性%三維不穩定性空間
축향비균균가열%병련통도%류동불은정성%삼유불은정성공간
axial non-uniform heating%parallel channel%flow instability%three-dimen-sional instability space
基于均相流模型建立并联通道系统的控制方程,采用交错网格技术和半隐式差分离散控制方程,并使用追赶法求解来模拟并联通道的两相流动特征。采用轴向余弦功率加热模拟轴向非均匀功率加热。运用小扰动法,获得了不同压力、入口过冷度和轴向功率加热方式下的稳定性边界(M SB )和三维不稳定性空间。对于余弦和均匀功率加热,系统稳定性均随系统压力的增大而增强。余弦功率加热在高过冷度区降低并联通道系统稳定性,而在低过冷度区增强系统稳定性。随进口阻力系数的增加,处于余弦功率加热的并联通道系统稳定性增强,M SB的拐点逐渐向高过冷度区移动。
基于均相流模型建立併聯通道繫統的控製方程,採用交錯網格技術和半隱式差分離散控製方程,併使用追趕法求解來模擬併聯通道的兩相流動特徵。採用軸嚮餘絃功率加熱模擬軸嚮非均勻功率加熱。運用小擾動法,穫得瞭不同壓力、入口過冷度和軸嚮功率加熱方式下的穩定性邊界(M SB )和三維不穩定性空間。對于餘絃和均勻功率加熱,繫統穩定性均隨繫統壓力的增大而增彊。餘絃功率加熱在高過冷度區降低併聯通道繫統穩定性,而在低過冷度區增彊繫統穩定性。隨進口阻力繫數的增加,處于餘絃功率加熱的併聯通道繫統穩定性增彊,M SB的枴點逐漸嚮高過冷度區移動。
기우균상류모형건립병련통도계통적공제방정,채용교착망격기술화반은식차분리산공제방정,병사용추간법구해래모의병련통도적량상류동특정。채용축향여현공솔가열모의축향비균균공솔가열。운용소우동법,획득료불동압력、입구과랭도화축향공솔가열방식하적은정성변계(M SB )화삼유불은정성공간。대우여현화균균공솔가열,계통은정성균수계통압력적증대이증강。여현공솔가열재고과랭도구강저병련통도계통은정성,이재저과랭도구증강계통은정성。수진구조력계수적증가,처우여현공솔가열적병련통도계통은정성증강,M SB적괴점축점향고과랭도구이동。
Based on the homogeneous flow model , the system control equations of parallel channels were established .Semi-implicit finite-difference method with staggered mesh was used to discretize the system control equations solved with a chasing method to simulate the two-phase flow behavior of parallel channels .The cosine heat flux was selected to simulate the axial non-uniform heating . The marginal stability boundary (MSB ) and three-dimensional instability space under different system pressures , different inlet subcoolings and different axial heating modes were obtained by using small perturbation method . The stability of parallel channels increases with system pressures for both cosine and uniform heat flux .At high inlet subcooling region ,the cosine heat flux can strengthen the system stability .However ,at low inlet subcooling region ,the negative effect on the system stability will be caused by cosine heat flux .For the cosine heat flux ,the increase of inlet resistant coefficient will move the turning point of the MSB to high inlet subcooling number and enhance the system stability .