Effects of Parameters on Continuously Working Plasma Synthetic Jet

Abstract

ABSTRACT:If the actuator of the plasma synthetic jet (PSJ) operates continuously under a high frequency, the performance of the actuator will become worse than it is in single pulse test. This is because the air in the cavity cannot fully recover to the original state before the next cycle starts. Therefore, the characteristics of the plasma synthetic jet during continuous operation, rather than during a single pulse, need to be studied carefully. In this paper, simulated flow fields of the continuously working PSJ are analyzed. It is found that the time-averaged results of the PSJ are self-similar, however, the instantaneous results are only self-similar when y is less than y 0.5 . Moreover, the effects of the dominant parameters, such as the maximum temperature, cavity shape and the operating frequency, on the performance of the PSJ actuator under stable operating condition are discussed. The maximum temperature is the most important parameter for the PSJ actuator. Actuator performance improves when the maximum temperature increases. In contrast, the frequency has little influence on performance, and the PSJ actuator is shown to perform well under a wide range of frequencies. This is more beneficial for active flow control compared with the synthetic jet actuator driven by the piezoelectric patch. The shape and the volume of the cavity can also influence the performance of the actuator. As the volume of the cavity becomes smaller, the duration of the spurt period is reduced.

The effect of vent openings on the microclimate inside multi-span greenhouses during summer and winter seasons

“…In recent years, the computational fluid dynamics (CFD) technique has become an important tool which is widely used in many fields, such as waterfront planning (Zhang, You, & Zhao, 2014), aeronautical engineering (Yu, Xu, & Gan, 2014), and fuel-cell design (Bao et al, 2014). In the greenhouse engineering community, many researchers have employed CFD to study the effects of greenhouse design (Bartzanas, Boulard, & Kittas, 2004;, Bournet, Ould Khaoua, Boulard, Migeon, & Chassériaux, 2007Hong et al, 2008;Kacira, Sase, & Okushima, 2004;Kacira, Short, & Stowell, 1998;Kittas and Bartzanas, 2007;Lee, Short, Sase, Okushima, & Qiu, 2000;Ould Khaoua, Bournet, Migeon, Boulard, & Chassériaux, 2006), specific equipment (Baeza et al, 2009;Fatnassi, Boulard, & Bouirden, 2003;Fatnassi, Boulard, Poncet, & Chave, 2006;Montero et al, 2013;Tamimi, Kacira, Choi, & An, 2013) and external weather conditions (Hong et al, 2008;Nebbali, Roy, & Boulard, 2012; Ould 400 K. He et al Khaoua et al, 2006;Teitel, Ziskind, Liran, Dubovsky, & Letan, 2008;Tong et al, 2009) on greenhouse climates.…”

Experimental Study on Ramp Shock Wave Control in Ma3 Supersonic Flow Using Two-Electrode SparkJet Actuator

“…On the one hand, the researchers conducted a detailed parametric study of SPJ actuator [19][20][21][22][23]. On the other hand, a large number of studies focused on the working characteristic [24][25][26], efficiency improvement [27,28] and structure optimization [29][30][31] of SPJ actuator. In addition, SPJ actuator has also been used for aerodynamic control [32,33], mixing enhancement [34] and separation control [35][36][37][38].…”