The present set-up is designed to study the forced draft centrifugal blower characteristics. The set-up consists of an fixed speed AC motor, coupled to a blower housing and fan. The fan is also called as impeller. The motor rotates the impeller inside the housing, and due to centrifugal force, exerted by the vanes of the impeller, partial pressure is developed at the inlet and outlet of the housing. The air flows through a pipe where instrumentation has been done to measure the pressure head, velocity and flow. A pitot tube with differential pressure manometer is provided to observe and find out the static and dynamic head of air, flowing through the pipe line. A control valve is also provided to regulate the flow of air. The set-up also provided with three impellers of different curved vanes to understand the effect of vanes arrangement on performance and efficiency of the blower.

Experimentation / Learning Objectives

••To study the effect of forward curved, backward curved and radial impeller. ••To find out the discharge, head and efficiency of the Centrifugal Blower. ••To plot the graph Efficiency vs Discharge. ••To plot the graph Discharge vs Head.

Utilities Required

••Electricity supply: Single phase, 220V AC, 50 Hz, 5-15 Amp. combined socket with earth connection. Earth voltage should be less than 5 volts. ••Floor Area: 3 m x 0.75 m