Abstract
A unique air flow rate measurement device has been developed and tested foruse in the Axial Fan Research and Development facility at Michigan StateUniversity. The subject mass air flow meter is located downstream of a widevariety of test fan and component geometries. These can significantly changethe velocity profile entering the metering nozzles. For this reason a pointmeasurement of a characteristic velocity in the nozzle outlet would notprovide a viable experimental technique for the flow rate evaluation. Thisalso negates the option of using a simple nozzle discharge coefficient.An integral measurement technique was therefore implemented. A 90° turningpassage supported on a knife edge pivot was used to create a measurable netmoment-of-momentum flux. The resistive moment provided by a strain gauge forcetransducer was used to infer this net flux. The acceleration of the flow frominlet to outlet of the 90° turn and the larger contribution of theoutlet moment-of-momentum flux provide the desired insensitivity to thenon-uniform inlet flow conditions. A calibrated nozzle was used to determinethe `force-mass flow rate' transfer function.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
