Swirl vanes design

Design mode, which can be (a) a scroll or swirl vane inlet instead of the tangential duct, (b) straight-through flow, without the conical portion, (c) insertion of various kinds of internal vanes, or (d) mechanical centrifugal separators... 

This completes our look at the design of cylinder-on-cone cyclones with tangential inlets. In the following section we discuss the design of cylindrical swirl tubes with swirl vanes. In this discussion, we concentrate on the aspects that are specific to swirl tubes. For the aspects shared between swirl tubes and tangential entry cyclones, much of the discussion above is equally valid for swirl tubes, such as the discussion pertaining to vortex finder configurations. 

Design of Swirl Tubes with Swirl Vanes... 

Figure 15.2.1 shows a cylindrical swirl tube with swirl vanes. We will look at the effects of two aspects of vane design the shape of the vanes—in particular the entrance and exit angles—and their thickness and number, which determines the area available for flow and, therefore, the velocity in the vane-pack. In this discussion we will often refer to the individual vane elements comprising the vane assembly as a blade element , vane element , or simply blade or vane . 

Inlet vanes Specially-designed adjustable vanes inserted in the airstrearn entering a fan inlet to control fan performance by producing a swirl of the gas in the direction of the rotation of the impeller. 

The test section is designed to accommodate either one or two flowmeters in series. A fixed distance of approximately 21 ft is available, between the upstream shutoff valve and the downstream flow control valve, for the installation of various test sections. The test section is mounted on the platform scale in order to eliminate any errors which would be introduced by flowing off the scale into a recovery line rigidly fixed with respect to ground. Straightening vanes are installed immediately downstream of the shutoff valve to eliminate the introduction of swirl into the test section resulting from the 180° bend and flow restriction of the shutoff valve. The straightening vanes are fabricated from 1-in. 

The second cyclone body shown in Figure 13.3.4 illustrate a vane-type inlet design that we refer to herein as a swirl tube separator. Vane inlets are the most symmetrical of all inlet designs but are somewhat more comphcated to design and fabricate or, in some cases, to cast. Both the twin inlet and vane inlet cyclone designs described thus far are of the conventional reverse-flow variety. 

The design of swirl tubes features much less prominently in the hteratme than cylinder-on-cone cyclones. The main design features specific to swirl tubes are the inlet vanes, the length of the swirl tube body and the configuration of the... 

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