What is it about?
A novel SJ actuator was designed and located at 30% of the chord from the leading edge (LE). Time-resolved particle image velocimetry (TR-PIV), force balance, static pressure distribution, and hotwire measurements were carried out in a subsonic wind tunnel to assess the performance enhancement due to the slotted SJ array. It was observed that actuation at 1000 Hz led to the highest increase in lift coefficient by 35.6% and reduction in average drag coefficient by 33%. TR-PIV measurements showed flow separation with flow reversal in the baseline case. After switching on the SJ array at 1000 Hz, the flow separation was completely eliminated.
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Why is it important?
The present work is important in order to design a novel SJ actuator that can impart higher SJ velocity and hence higher momentum coefficient with a reduced number of piezoelectric diaphragms. Reduction in the number of piezoelectric diaphragms substantially reduces the power consumption. Another objective of this work was to estimate the performance improvement of the wing by varying the SJ actuation frequency.
Perspectives
The synthetic jet actuators are quite useful in controlling the flow separation over the wing model. The geometric dimensions of the actuator and frequency of actuation plays an important role in the flow control application.
Dr Pramod Salunkhe
Manipal University
Read the Original
This page is a summary of: Aerodynamic Performance Improvement of a Wing Model Using an Array of Slotted Synthetic Jets, Journal of Fluids Engineering, June 2020, ASME International,
DOI: 10.1115/1.4047397.
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