DOI: https://doi.org/10.20535/2521-1943.2017.81.116579

Minimization of vibrational factor in experimental investigations of limited swirling flows microstructure

V. Turiсk, V. Kochin, M. Kochina

Abstract


Purpose. The article presents results of vibration monitoring of aerodynamic test bench for experimental investigations of the limited swirling flows microstructure and for development of new methods of mass eddy transfer control in mixture chambers. The subject of research is increase of identification accuracy of coherent vortex structures in chambers by reducing of influence of additional components in measurement signals induced by instantaneous translatory velocities of current owing to oscillations of test bench elements. Design/methodology/approach. To reduce the negative effects of mechanical vibration on the results of aerodynamic measurements, a series of changes were made to the design of the aerodynamic stand. To evaluate the quality of these changes in vibration levels, measurements of vibration acceleration in two zones were made: 1) directly near two sources of forced oscillations (motor and fan); 2) in zone of coordinate station with location of the holders of hot-wire anemometer sensors. Findings. Vibration monitoring of the aerodynamic bench proved that its modernization reduced the magnitude of vibration acceleration in direction of longitudinal axis of the chamber in about 4 times, and the magnitude of vibration acceleration along the vertical axis in approximately 2 times. The obtained data and testing technique made possible to correct identification of detected vortical structures, to reduce errors in determining pulsations of velocities and their statistical characteristics in shear flows of the vortex chambers of power or technological application.

Keywords


vortex chamber; vortical structures; flow characteristics; hot-wire anemometer measurements; vibration diagnostics; vibration acceleration

References


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