二维流化床内射流深度的试验研究

研究二维流化床内的水平射流和垂直向上射流。利用图象处理技术得到了水平射流的水平深度和垂直向上深度以及垂直向上射流的射流深度。通过多元线性最小二乘回归，得到了射流深度的关联式。研究了流化数、射流速度、颗粒平均粒径和静态床层高度对射流深度的影响。试验结果表明，流化数和射流速度的增加，射流深度将增加；颗粒粒径增加，射流深度将减小；静态床层高度变化时，射流深度基本不变。发现射流深度决定于射流与乳化相气体和颗粒的动量交换。对水平射流的垂直向上深度和垂直向上射流的射流深度进行了比较。

An Experimental Investigation of the Jet Penetration Depth in a Two-dimensional Fluidized Bed

Horizontal jet and vertical upward jet are studied in a twcrdimensional fluidized bed. Horizontal and upward depth of horizontal jet and jct penetration depth of vertical upward jet are aCquired hawh upon digi tal image processing. The regression of the experimental data yields the correlation of jet penetration depth. The influences of fluidizing number, injection velocity, partical diameter and the static bed height on jet penetraion depth are studied. The results show that jet penetration depth increases with the fluidizing number and injection velocity, and decreases with partical diameter. The static height has only a small influence on the jet penetration depth. Jet penetration depth is decided mainly by the transfer of momentum between jet and emulsion phase of tal. The vertical upward depth between horbotal jet and vertical upward jet are compared.