Novel Technique to Determine SparkJet Efficiency

Golbabaei-Asl, Mona; Knight, Doyle; Wilkinson, Stephen

doi:10.2514/1.j053034

Cited by 31 publications

(21 citation statements)

References 18 publications

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“…This trend is quite different from that of discharge efficiency and heating efficiency of capacitive discharge, where increasing energy deposition will do harm to their improvement [10,14]. Orifice diameter can be used to tailor the instantaneous mass flow rate, and thus the jet duration time.…”

Section: V T T V T a Dt E V T T V T A Dtmentioning

confidence: 95%

Electro-mechanical efficiency of plasma synthetic jet actuator driven by capacitive discharge

Zong¹,

Kotsonis²

2016

J. Phys. D: Appl. Phys.

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Section: V T T V T a Dt E V T T V T A Dtmentioning

confidence: 95%

Electro-mechanical efficiency of plasma synthetic jet actuator driven by capacitive discharge

Zong¹,

Kotsonis²

2016

J. Phys. D: Appl. Phys.

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“…Jets induced by the capacitive discharge demonstrate higher peak jet velocity but shorter jet duration [26] compared with inductive discharge type. By comparing the experimental pulsed thrust with that obtained from analytical models, heating efficiency of the capacitive discharge has been determined to be less than 10%, and inversely proportional to the amount of energy deposition [27][28][29]. In contrast, nanosecond pulse discharge is reported to have a significantly higher heating efficiency (~60%), and decrease of the rising rate benefits the jet intensity improvement [30][31].…”

Section: Introductionmentioning

confidence: 97%

Characterisation of plasma synthetic jet actuators in quiescent flow

Zong¹,

Kotsonis²

2016

J. Phys. D: Appl. Phys.

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An experimental characterisation study of a large-volume three-electrode Plasma Synthetic Jet Actuator (PSJA) is presented. A sequential discharge power supply system is used to activate the PSJA. Phase-locked planar Particle Image Velocimetry (PIV) and time-resolved Schlieren imaging are used to characterise the evolution of the induced flow field in quiescent flow conditions. The effect of orifice diameter is investigated. Results indicate three distinct features of the actuator-induced flow field. These are the initial shock waves, the high speed jet and vortex rings. Two types of shock waves with varied intensities, namely a strong shock wave and a weak shock wave, are issued from the orifice shortly after the ignition of the discharge.. Subsequently, emission of a high speed jet is observed, reaching velocities up to 130 m/s. Pronounced oscillation of the exit velocity is caused by the periodical behaviour of capacitive discharge, which also lead to the formation of vortex ring trains. Orifice diameter has no influence on the jet acceleration stage and the peak exit velocity. However, a large orifice diameter results in a rapid decline of exit velocity and thus a short jet duration time. Vortex ring propagation velocities are measured at peak values ranging from 55 m/s to 70 m/s. In the case of 3 mm orifice diameter, trajectory of the vortex ring severely deviates from the actuator axis of symmetry. The development of this asymmetry in the flow field is attributed to asymmetry in the electrode configuration.

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“…On the other hand, the drawback of PSJA's low efficiency has been identified, which hinders its practical usage. Various researches pointed out its efficiency is less than 30% [14][15][16][17], sometimes it is even less than 1% [18,19]. It is eventually found that the efficiency is affected by the electrode gap distance.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on multichannel discharge circuit and multi-electrode plasma synthetic jet actuator

Zhang

Sun

et al. 2017

J. Phys. D: Appl. Phys.

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To solve the low efficiency of plasma synthetic jet actuator (PSJA), a multichannel discharge technique based on the concept of voltage relay is put forward and a new multi-electrode plasma synthetic jet actuator (ME-PSJA) is designed. Experiment shows the multichannel discharge technique can enlarge the discharge channel distance by multiplying the discharge channel number without increasing the input voltage. With a 1 nF discharge capacitor, the discharge efficiency of three channels discharge increases 135% compared with standard one channel discharge. When the discharge capacitor increases to 0.3 μF, a four discharge channels still improves the discharge efficiency 119 % as well. Schlieren flow visualization confirms that ME-PSJA also outperforms the 2-electrode PSJA in terms of jet velocity and duration time, both are increased by about 50%.

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Novel Technique to Determine SparkJet Efficiency

Cited by 31 publications

References 18 publications

Electro-mechanical efficiency of plasma synthetic jet actuator driven by capacitive discharge

Electro-mechanical efficiency of plasma synthetic jet actuator driven by capacitive discharge

Characterisation of plasma synthetic jet actuators in quiescent flow

Experimental research on multichannel discharge circuit and multi-electrode plasma synthetic jet actuator

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