陶瓷球与生物质半焦混合体在不同截面形状斜管中的速度特性

为了探索不同截面形状斜管对陶瓷球与生物质半焦混合固体颗粒速度分布的影响规律，设计了PIV冷态模拟试验装置。利用PIV技术对陶瓷球（粒径为1、2和3 mm）与生物质半焦不同质量比例（10∶1、30∶1和50∶1）的混合颗粒在3种不同截面形状（圆形、半圆半方形和方形）的斜管中（稳流阶段X=1 190 mm截面）流动规律进行了试验研究。试验结果表明:在3种不同截面形状斜管中生物质半焦轴向时均速度在yd＝0～1内形状分布都类似于“磁滞回线”；在混合颗粒质量比例为10∶1时，生物质半焦轴向时均速度分布基本不受截面形状影响，都可以用方管或半圆半方管来近似代替圆管进行试验；而在陶瓷球粒径为1和2 mm时，混合颗粒质量比例为30∶1和50∶1时，生物质半焦轴向时均速度分布受截面形状影响较大，不可以用方管或半圆半方管来代替圆管进行试验。 

Velocity Characteristics for Mixture of Ceramic Balls and Biomass Chars in Incline Tube with Different Cross-section Shape

To explore movement law of biomass chars and ceramic balls mix flows in the incline tube with different cross-section shape，cold state PIV analog equipment was designed.Flow of ceramic balls （diameter of 1，2 and 3 mm） and biomass char with different mass ratio （10∶1，30∶1 and 50∶1） in three different cross-sectional shapes （circular，semi-circular half-square and square） of inclined tubes （X= 1190 mm cross section in steady flow phase） by PIV technique were studied.Results showed that:in the inclined tube with three different cross-section shape，the distribution of biomass char axial mean velocity in the yd = 0-1 range shape was similar to ‘hysteresis loop’.When mixing quality ratio was 10∶1，the biomass char axial mean velocity distribution was not affected by different cross-section shape，it could use square tube or semi-circular half-square tube instead of circle tube in experiments of inclined tube.When ceramic sphere diameter was 1 and 2mm，mixed particle mass ratio of 30∶1 and 50∶1，the biomass char axial mean velocity distribution was affected by different cross-section shape，it could not use square tube or semi-circular half-square tube instead of circle tube in experiments of inclined tube.