摘要
为了探索下降管内陶瓷球与生物质半焦混合体颗粒的速度分布规律,利用粒子图像测速技术对粒径为1mm的陶瓷球与生物质半焦不同质量比例(10:1、20:1、30:1、32:1、40:1、50:1和60:1)的混合颗粒在斜管中的流动规律进行了研究。试验结果表明:混合颗粒流动分为紊乱流动(0～500mm)、过渡流动(500～590mm)和稳流(590mm以后)3个阶段;在稳流阶段,随着混合质量比例的增大,轴向时均速度也逐渐增大;不同截面不同混合质量比的轴向时均速度分布基本一致;径向时均速度随着混合质量比例的增大而增大,但是值都小于0.2m/s。试验所得结果为斜管中陶瓷球与生物质半焦混合体的换热规律的研究提供理论参考。
In order to study the velocity distributions of the mixture flow for ceramic balls and biomass chars in incline tube reactor,the flowing characteristics of mixture in incline tube were measured by using particle image velocimetry(PIV),and different quality ratios(10:1,20:1,30:1,32:1,40:1,50:1 and 60:1) of ceramic balls with diameter 1mm to biomass chars were used in the experiments.The experimental results showed that the mixed flow was composed of three phases,which were disordered flow(0～590 mm),transition flow(500～590 mm)and steady flow(≥590 mm) respectively.In the steady flow phase,the axial velocity increased when the ratio of ceramic balls to biomass chars increased.At different sections and different mixing ratios,the axial velocity distributions were similar and the radial velocities were all less than 0.2 m/s.The results can provide theoretic references for the study of heat transfer law of the mixture flow of ceramic balls and biomass chars in incline tube.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2010年第S2期264-268,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金资助项目(50875056)
国家"863"计划资助项目(2009AA05Z401)
