CAJ | 학술논문

主要对自主设计的渐缩管、渐扩渐缩管、螺旋管和四孔管进行水-空气两相流混合顶吹实验，并得出了扰流型喷管的管内流型变化规律。实验通过对可视化特殊喷管内的气液两相进行高速拍摄，并调节水与空气两相各自的体积流量，获取不同喷管中出现的特殊流型照片及视频。实验结果表明：在表观气速和表观液速变化时，除渐缩管外，其他特殊喷管的流型转变均有一定规律性；渐扩渐缩管内截面半径变化较大，易产生环状-搅拌流，并有典型泡状流出现，螺旋管由于轴向环流速度的影响，会产生大密度泡状流并逐渐过渡到有旋流趋势的环状流型，特殊结构的四孔管中流型较稳定，短暂出现泡状流、弹状流后形成稳定环状流。四孔管的设计最利于冶金熔炉中柴油-氮气混合两相流喷吹，形成的气泡群中单个气泡直径较小，柴油被充分细化打散，渣层中的还原反应更充分，能有效提高柴油对渣层中磁性铁的还原率。
주요대자주설계적점축관、점확점축관、라선관화사공관진행수-공기량상류혼합정취실험，병득출료우류형분관적관내류형변화규률。실험통과대가시화특수분관내적기액량상진행고속박섭，병조절수여공기량상각자적체적류량，획취불동분관중출현적특수류형조편급시빈。실험결과표명：재표관기속화표관액속변화시，제점축관외，기타특수분관적류형전변균유일정규률성；점확점축관내절면반경변화교대，역산생배상-교반류，병유전형포상류출현，라선관유우축향배류속도적영향，회산생대밀도포상류병축점과도도유선류추세적배상류형，특수결구적사공관중류형교은정，단잠출현포상류、탄상류후형성은정배상류。사공관적설계최리우야금용로중시유-담기혼합량상류분취，형성적기포군중단개기포직경교소，시유피충분세화타산，사층중적환원반응경충분，능유효제고시유대사층중자성철적환원솔。
This paper focused on the design of tapered tube,converging diverging tube,spiral tube and the four-hole tube for gas-liquid two-phase flow mixing top-blowing experiments. The variations of flow patterns in the pipe of turbulent-spray gun were obtained. The experiment investigated the high-speed photography through the two-phase mixture of gas-liquid in the visualized special nozzle, the adjustment of volume flow in each phase,and visualization of the special flow patterns in different nozzles. The experimental results showed that the following:the flow pattern transition changed regularly with the changes in superficial gas velocity and superficial liquid velocity in all tubes except for the tapered tube;With the great change in section radius in the converging diverging tube, annular-churn flow could be easily produced,and typical bubble flow could also exist;under the influences of the axial velocity,spiral tube could have a high density of bubble flow pattern and annular flow and slug flow for a short period of time,and then form steady annular flow;the design of four-hole pipe was beneficial to two-phase flow of diesel-nitrogen mixture in metallurgical furnaces, the single bubble formed in this type of tube was smaller in diameter,resulting sufficiently scattered diesel fuel,the reduction reaction of slag layer was therefore more efficient with higher,reaction rate of magnetic iron in diesel.