化学工程
化學工程
화학공정
CHEMICAL ENGINEERING
2010年
4期
25-28,44
,共5页
气固流化床%流型图像%分形盒维数%多重分形
氣固流化床%流型圖像%分形盒維數%多重分形
기고류화상%류형도상%분형합유수%다중분형
gas-solid fluidized bed%flow pattern images%fractal box dimension%multi-fractal
以无色小粒径玻璃珠和空气为实验介质,利用高速摄影系统在气固流化床实验装置上拍摄.并获取到气固流化床5种典型流型的空间图像信息.采用多重分形谱参数分层次地刻画了流型空间信息内部的精细结构,突出了异常局部变化特征,从复杂的流型图像数据中选出具有明显个性特征,与分形盒维数结合表征流型.结果表明,多重分形谱比简单的分形盒维数能提供更多的流型特征的信息,且流型特征的提取结果更符合实际情况,可被有效地用于气固流化床流型识别和运动机理分析的过程中.
以無色小粒徑玻璃珠和空氣為實驗介質,利用高速攝影繫統在氣固流化床實驗裝置上拍攝.併穫取到氣固流化床5種典型流型的空間圖像信息.採用多重分形譜參數分層次地刻畫瞭流型空間信息內部的精細結構,突齣瞭異常跼部變化特徵,從複雜的流型圖像數據中選齣具有明顯箇性特徵,與分形盒維數結閤錶徵流型.結果錶明,多重分形譜比簡單的分形盒維數能提供更多的流型特徵的信息,且流型特徵的提取結果更符閤實際情況,可被有效地用于氣固流化床流型識彆和運動機理分析的過程中.
이무색소립경파리주화공기위실험개질,이용고속섭영계통재기고류화상실험장치상박섭.병획취도기고류화상5충전형류형적공간도상신식.채용다중분형보삼수분층차지각화료류형공간신식내부적정세결구,돌출료이상국부변화특정,종복잡적류형도상수거중선출구유명현개성특정,여분형합유수결합표정류형.결과표명,다중분형보비간단적분형합유수능제공경다적류형특정적신식,차류형특정적제취결과경부합실제정황,가피유효지용우기고류화상류형식별화운동궤리분석적과정중.
Taking small particle-sized colorless beaded glass and air as test medium, 5 typical flow pattern images of the gas-solid two-phase flow were captured by using high-speed camera system in the experimental apparatus of gas-solid fluidized bed. The parameters of multi-fractal spectrum were used to describe the refined structure of flow pattern spatial information at different levels, and highlight the characters of abnormal local changes. Thus, the distinct thumbprint was selected from the complicated flow pattern image data, which could characterize the flow pattern by combining with fractal box dimension. The results show that the multi-fractal spectrum can provide more comprehensive flow pattern characteristic information than simple fractal box dimension. The extraction results of flow pattern characteristic are more in line with the actual situation. It can be used effectively in the flow pattern identification and motion mechanism analysis of gas-solid fluidized bed.