Flow swirling plates

Various hollow-cone simplex atomizers (Fig. 2.1) have been developed for combustion applications, differing from each other mainly in the way that swirl is imparted to the issuing liquid jet. In these atomizers, swirl chambers may have conical slots, helical slots (or vanes), or tangential slots (or drilled holes). Using thin, removable swirl plates to cut or stamp the swirl chamber entry ports leads to economies of the atomization systems if spray uniformity is not a primary concern. Large simplex atomizers have found applications in utility boilers and industrial furnaces. Oil flow rates can be as high as 67 kg/min. 

Sun. Wenshou, Wu, Zhongbiao and Tan, Tianen (2001). A study on desulfurization with Mg-enhanced lime in the swirling flow plate column. Environment Science, 22(3) 104-107 (in Chinese). 

Figure 12.3 Contours of mean axial velocity (m/s) for 65°/30° (a) and 50°/30° (6) swirl distribution in the burner with equal flow distribution under nonburning conditions. (Refer color plate, p. XII.)...

Figure 12.4 Measured OH distribution in the propane flames. Flow distribution 25% inner and 75% outer annulus. Swirl combinations 55°/30° (a) and 65°/30° (fe). (Refer color plate, p. XIII.)...

The model was initially run at MCR for a baseline condition. The velocity profiles were set to the design conditions at the model entrance. The mass flow readings, peripheral distribution, and swirl were then recorded. Baffle plates were then installed strategically within the model and the mass flow, peripheral distribution, and swirl were then remeasured. 

In both cases, the bottom boundary condition was simply a no flow-through condition. The bottom configuration varies in swirl tube designs some swirl tubes discharge directly to a wider hopper without any bottom plate. Such an arrangement does not encourage gas to suddenly turn inwards at the bottom of the main body cylinder. 

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