Centrifugal Fan Inlet Design

Fan parts impeller design the centrifugal fans impeller have five basic blade shapes and a number of impeller configurations i e dwdi double width double inlet or swsi single width single inlet.

Centrifugal fan inlet design.

Energy balance is established at fan inlet intermediate stage of impeller and outlet stage of volute scroll casing. A modern optimum design method for a centrifugal fan has been presented using a computational fluid dynamics cfd technique to replace the conventional method. When the impeller rotates air is allowed to enter the fan around the open space between the impeller and the shaft and is forced to proceed at a right angle to the. In centrifugal fans the air flows at right angles to the inlet air direction and throws the air outward toward the outlet through the action of deflection and centrifugal force.

Such a fan is also called a blower fan biscuit blower citation needed or squirrel cage fan because it looks like a hamster wheel. Position on inlet box is designated in degrees clockwise from top vertical axis as shown. ρᵢ is the density of the air at the inlet edge of the fan blades. A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid.

W is the width of the blades in a centrifugal fan parallel to the axis of rotation of the impeller. During this process stage velocity pressure and discharge at different stages are calculated. Rₐ is the specific or mass gas. Reference line is the top vertical axis through center of fan shaft.

Radial forward curved and backward curved see figure 5 3. The impeller design will depend on the aerodynamic duty and the operating conditions. Volume flow up to 250 000 m h single inlet design up to 500 000 m h double inlet design pressure rise up to 15 000 pa single stage up to 30 000 pa double stage shaft support with overhung arrangement or on both sides.

Position of inlet box and air entry to inlet box in determined from drive side of fan. Types the major types of centrifugal fan are. However in many cases space constraints or other factors prohibit designers to allow for ideal conditions. Centrifugal fan design methodologies studies on radial tipped centrifugal fan 112 after inlet duct.

Inlet box positionsfor centrifugal fans amca standard 99 2405 83 notes. Single inlet single width sisw or double inlet double width didw shaft power up to 200 kw. The effects of the blade inlet. Fan installations with system effects should be avoided if possible.

Pᵢ is the pressure of the air at the inlet edge of the fan blades. Fan types typically affected by both inlet and outlet conditions are inline fans both axial and centrifugal and housed single inlet centrifugal fans.