Force measurements on plasma actuators using phase-locked particle image velocimetry

PDF

Authors
  1. Pimentel, R.
  2. Lahouti, A.
  3. Lavoie, P.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN);Toronto Univ, Toronto ONT (CAN)
Abstract
Phase-locked Particle Image Velocimetry (PIV) has been used to investigate the time-dependent behaviour of a Dielectric Barrier Discharge (DBD) plasma actuator, excited by a sine-wave signal with peak-to-peak amplitudes between 7.2 kV and 10 kV, and frequencies of 2.5 kHz and 4 kHz. Measurements were initially carried out in a 31.5 mm x 15 mm domain, resulting in a spatial resolution of 0.1072 mm, in 12 phase intervals throughout the excitation cycle. In order to improve the spatial and temporal resolution, additional measurements were carried out for a subset of the excitation parameters in an 8.1 mm x 6.1 mm domain, resulting in a spatial resolution of 0.0276 mm in 24 phase intervals. Momentum balance in a control volume surrounding the actuator has been used to estimate the body force based on the results of the PIV measurements. The results indicate that the maximum induced velocity and body force occur during the negative half-cycle of the excitation signal, with a phase lag relative to the excitation signal that grows when excitation voltage or frequency is increased. A smaller, secondary peak is observed in the induced body force, occurring during the positive half-cycle of the excitation signal. The results suggest that this peak is due to formation of a secondary high-velocity region due to local discharges near the grounded electrode. Two methods have been used to determine the shear force, resulting up to 25% variability in the estimated body force. Considering thi
Keywords
plasma actuator;dielectric barrier discharge;DBD;PIV;phase-locked;PIV
Report Number
DRDC-RDDC-2015-R071 — Scientific Report
Date of publication
01 May 2015
Number of Pages
46
DSTKIM No
CA040397
CANDIS No
801513
Format(s):
Electronic Document(PDF)

Permanent link

Document 1 of 1

Date modified: