Realisation of plasma synthetic jet array with a novel sequential discharge

Abstract

The Plasma Synthetic Jet Actuator (PSJA) is a zero-net mass flow actuator, capable of producing supersonic pulsed jets at high frequency (>5kHz). Successful application of PSJA to active flow control necessitates the removal of two obstacles, namely, low energy conversion efficiency and small jet affected length. A novel sequential discharge scheme employing a simple architecture is proposed to feed a PSJA array of multiple actuators. Phase-locked Particle Imaging Velocimetry (PIV) and electrical measurements are exploited to quantify the performance of the PSJA array. The jet impulse and jet mechanical energy of the PSJA array first improves and then drops, when the actuator number ranges from 1 to 6. Compared to that of single actuator, the discharge efficiency of PSJA array at an actuator number of 4 is increased by 10%, and the electro-mechanical energy is augmented by 340%. Additionally, the jet affected length is extended from the order of 10 mm to the order 100 mm.

Airfoil flow separation control with plasma synthetic jets at moderate Reynolds number

“…The discharge circuits proposed by Zhang et al (2017a) and Zong and Kotsonis (2017c) are combined to power the actuator array in this study. Figure 2 shows the power supply system.…”

Influence of Nondimensional Heating Volume on Efficiency of Plasma Synthetic Jet Actuators

“…A cylindrical coordinate system is established in the jet exit center as shown in Figure 1, with r-axis and x-axis along the radial and the axial direction respectively. Figure 1 (a) Large-cavity actuator; (b) Small-cavity actuator A sequential discharge power supply (trigger discharge-capacitive discharge) proposed by Zong & Kotsonis is deployed to implement the energy deposition [10]. For the large-cavity actuator, an energy-storing capacitor with capacitance (C 1 ) of 1µF is connected in the discharge circuit and the capacitor voltage (U c ) is charged to 2 kV before ignition.…”

A novel de-icing strategy combining electric-heating with plasma synthetic jet actuator

“…36 And nanosecond pulsed discharge can generate a high electric field that allows efficient electron impact ionization with a lower power consumption, in contrast to microsecond plasma discharge. 37 Besides, the realization of plasma synthetic jet array with a sequential 38 or parallel 39 discharge makes a noteworthy step towards industrial application. In the future, in order to meet the needs of de-icing, the power supply system might not require a high-frequency operation but should be able to provide more energy in every single discharge.…”