STUDY ON CIRCULARTORY SELF-GENERATED VORTEX FLOW IN A CONFINED SPACE TO MEASURE ROTATION

Abstract

To detect rotation, an angular velocity sensor is used. The working principle of
the small-sized MEMS angular velocity sensor is based on the displacement of the
reference element - a mass or gas flow due to the Coriolis effect generated from
rotation. This article presents research on high-speed circulating vortex flow using
rotation measurement of an airflow angular velocity sensor. Vortex flow is created in
the device body by oscillation of the PZT piezoelectric membrane through a cyclic
connection network from the pump chamber, through the rectifier gap, the channel,
to the vortex chamber and back to the channel. . The gas flow will circulate at a
higher velocity after each oscillation cycle of the piezoelectric membrane to form a
stable vortex in the measurement chamber. With the above design, the vortex flow
is analyzed and numerically simulated using OpenFOAM. Some of the results of the
simulation are used to set up an experiment on a sensor prototype in which the
vortex flow characteristics are tested using the sensor element - hotwire based on
the principle of thermal convection. Additionally, the device's ability to measure
angular velocity í successfully tested on a turntable.