CAJ | 학술논문

从不同层次上研究了循环流化床颗粒相的湍流结构。PDA测量发现颗粒在壁面附近的运动表现出显著的成团特征和湍流度显著降低，小波分析法得到的直观图形象地揭示了颗粒速度脉动的自相似、分叉等具有混沌特征的微观结构，且在不同的尺度上颗粒速度脉动表现出各向异性的特征。
종불동층차상연구료순배류화상과립상적단류결구。PDA측량발현과립재벽면부근적운동표현출현저적성단특정화단류도현저강저，소파분석법득도적직관도형상지게시료과립속도맥동적자상사、분차등구유혼돈특정적미관결구，차재불동적척도상과립속도맥동표현출각향이성적특정。
Turbulence structures of solid phase in a circulating fluidized bed were (CFB)characterized. The investigations were carried out using a Particle DynamicAnalyzer (PDA). Temporal evolutions of the particle velocity fluctuationindicate that the great agitation and non-homogeneity with time and spacecoordinate of the solid phase. The studies on turbulent density illustratethat the turbulence in the CFB is an anisotropic turbulence, and the particleturbulent density decreased sharply as the measurement points move away fromthe wall. To further understand the microstructure of the particle velocityfluctuation, wavelet analysis was also adopted. The vivid imagines show thatit is an anisotropic turbulence at all scales and its fractal and dissipativestructure.