Abstract:

In order to design an air distribution pipe, which is suitable for supplying comfortable air indoors, air distribution pipes of two modes of closed impermeable tail part and permeable and ventilation tail part were simulated by adopting FLUENT numerical simulation software, and the  velocity and pressure variation of the internal folw field were studied. The result indicated that: the center velocity of the air distribution pipe with the closed tail part changes from 4 m/s to 0, and an eddy flow is formed at the tail apart; and the center velocity of the air distribution pipe with the permeable tail part changes from 4 m/s to 2.5 m/s, and the center air velocity of the tail part is relatively high. Proceeding along with the axial direction of the air distribution pipe,the air-out velocity of the fiber wall surface of the air distribution pipe with the colsed tail part gradually decreases, and the air-out velocity is in the range of  0.15 - 0.4 m/s. The center velocity of the air destribution pipe with the permeable tail part is relatively uniformly, and the air-out velocity is in the range of 0.28 - 0.4 m/s. In the adpect of air-out of the fiber wall surface, the air distribution pipe with the permeable tail part is more uniform than that with the closed tail part, and the both gave no air blowing feeling, meetion the requirement of the human body to comfortability indoors. These results are of significance in the application of the fiber air fupply of air distribution pipes.

Key words: fiber air dispersion system, air distribution pipe, center velocity, closed tail part, permeable tail part