Abstract
Coupled with the multichannel discharge model and plasma synthetic jet actuator (PSJA) aerodynamic model, an analytical model to predict the performance of the PSJA array is put forward. The multichannel discharge model takes these factors into consideration, the delay time in the breakdown process, the electrical transformation of the discharge channel from a capacitor to a resistor induced by the air breakdown, and the varying plasma resistance in the discharge process. The PSJA aerodynamic model is developed based on the conservation equations of mass, momentum, energy, and the lumped capacitance method. The multichannel discharge model can simulate the multichannel discharge process and give the discharge energy in the plasma channel. With a constant heating efficiency, the time-independent heating energy deposition power in a discharge channel is obtained. Importing the heating energy, the PSJA aerodynamic model presents the evolution process of the jet. Simulation results show that the jet strength induced by a single actuator decreases with the number of actuators in the PSJA array. When the actuator number increases from 1 to 20, the weakening extent of mass ejected, peak jet velocity, and jet duration time is 62%, 54%, and 33%, respectively. The discharge efficiency increases with the actuator number, while the thermodynamic efficiency decreases with the actuator number. As a result, the total energy efficiency doesn’t always increase with an increase in the number of actuators. When the discharge efficiency of a conventional one channel discharge has been a relatively large value, the total energy efficiency actually decreases with the growth of actuator number.
Highlights
Plasma actuators have attracted a lot of research attention in recent years because of the associated advantages, such as the absence of moving components, fast response, and wide bandwidth
It should be noted that the dielectric barrier discharge (DBD) plasma actuator with annular electrodes can generate a vertical jet [7,8], and has the name of plasma synthetic jet actuator too [9]
The plasma synthetic jet actuator array (PSJA array) developed by the authors can enlarge the area affected by the actuator greatly, which is more suitable for practical application
Summary
Plasma actuators have attracted a lot of research attention in recent years because of the associated advantages, such as the absence of moving components, fast response, and wide bandwidth. A multichannel discharge technique based on a voltage relay concept is proposed by the authors’ group [17,18,19] It allows multi-channel discharge without increasing the input voltage and without adding an additional current-limiting resistor. In 2003, Grossman et al [20] developed a first-order PSJA model It can only predict the basic performance parameter, such as the jet velocity. No model is available to predict the performance of a PSJA array, namely a number of PSJAs. The plasma synthetic jet actuator array (PSJA array) developed by the authors can enlarge the area affected by the actuator greatly, which is more suitable for practical application. A new analytic model is developed in the present work It consists of two parts: The multichannel discharge model and the PSJA aerodynamic model. As the number of PSJAs potentially affects the performance, the effect of the number of PSJAs is studied using the new model
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