Mechanism And Experimental Study On Trajectory Of Discrete Phase Oil Droplet In Vortex Field

The hydrocyclone has been widely used in petroleum, chemical and other various fields due to its unique properties. As the applicable scope increasing, the correspond ing theoretical research, experimental design, equipment manufacturing and application technology research has made considerable development. Present research on hydrocycl one mainly focused on flow field characteristics, classification, separation performance and operating performance. The study on flow field characteristics from mathematical methods, black box method, numerical modeling was applied to the flow field measur ement. With the deepening of the research, previous research is gradually beginning to show its deficiencies and shortcomings. In order to analyze features of internal flow field of the hydrocyclone, this dissertation makes a breakthrough on previous research methods, the theoretic alanalysis, numerical modeling and experiment has been carried out to realize the visualization analysis of internal flow field. The variety of factors a nd influence of the cyclone separation performance were intuitive interpreted and evalu ated, which has very important enlightening meaning to enhance the adaptability of cy clone and enriched the internal flow field characteristics of hydrocyclone theory, and a lso promoted the development of the related disciplines.This article applied the numerical simulation software to study the moving tracks of discrete phase oil drops of the internal hydrocyclone field. Oil drops’ moving track s were obtained of different injecting positions, injecting velocity and particle size in t he vortex field, and then by observation and analysis of the oil drops’ moving tracks,a new type of spiral flow inlet was designed. Then we concluded a new concept of coalescing structure, which to some extent would improve the separating performance. Meanwhile, we theoretically proved the feasibility to expand applicable range of transf orming overflow pipe and underflow pipe without change the main body’s structure.It was the first time to combine the PIV experiment with high-speed camera tech nology to carry out a visualization of the hydrocyclone flow field. Through the ration al design of experiments, we successfully conducted an exploration of the dispersed p hase migrating locus in the swirling flow field. By the visual test, we found the deriv ative vortex’s distribution and its influence in the swirling flow field and by observing the oil’s migration locus in the swirling flow field, we concluded that different particle sizes of the oil drops have a different migration law within the swirling flow field.Meanwhile by observation and analysis of the oil core in the swirling flow field, we obtained the effect of variation of the oil core with the flow on the separation efficie ncy of hydrocyclone.In order to test and validate the conclusions of this article, we carry out both a l aboratory test and field test to explore relevant domain from the conclusions of this a rticle. Eventually, we prove the rationality and correctness of the theory of the new st ructure through laboratory and flow field test.