Article
Engineering, Electrical & Electronic
Huifeng Miao, Zhibo Zhang, Yun Wu, Yangyang He, Yinghong Li
Summary: This study introduces a novel self trigger three-electrode plasma synthetic jet actuator that can extend the electrode distance with low breakdown voltage, leading to higher precursor shock velocity and discharge efficiency compared to traditional PSJA.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Physics, Applied
Huifeng Miao, Zhibo Zhang, Yun Wu, Wei Cui, Yinghong Li
Summary: A novel semiconductor enhanced plasma synthetic jet actuator (SEPSJA) with reduced driving voltage and improved jet performance is proposed in this study, showing better efficiency and higher jet velocity compared to traditional PSJA. The SEPSJA is worth further exploration in the field of flow control.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Aerospace
Ming Xue, Zhangsong Ni, Chao Gao, Bin Wu, Borui Zheng
Summary: A tri-electrode dielectric barrier discharge plasma actuator is proposed to achieve a deflected synthetic jet by changing the polarity and magnitude of the direct current component. The experiment results show that different discharge modes induce different vortices, resulting in different jet deflection effects.
Article
Instruments & Instrumentation
Kapil Motwani, Dharmraj V. Ghodke, Ajith Amban, Murali Krishnan Kochunarayanan, M. S. Ansari, Vijendra Prasad
Summary: The simplest way to produce high density hydrogen plasmas is to form an arc between the arcing electrode and the plasma chamber. This paper describes the development and testing of a pulsed power supply that delivers constant current pulses, using a high frequency buck converter topology. By changing the arc current, the arc impedance and the positive hydrogen ion current were also measured.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Engineering, Aerospace
Rubing Liu, Shenghui Xue, Wentao Wei, Qi Lin, Kun Tang
Summary: This study proposes an air-supplied actuator with a check valve externally connected to the cavity to improve its gas-supplying ability and jet performance. High-speed schlieren is employed to photograph the internal flow field of the discharge chamber, revealing that the inhalation airflow velocity of the jet orifice is doubled when the actuator is continuously working in the effective frequency band under the combined action of additional air supply from the check valve in the inhalation recovery stage. The results have important implications for the performance optimization of the air-supplied actuator.
Article
Engineering, Aerospace
Rubing Liu, Ruixin Lin, Guangce Lian, Shenghui Xue, Qi Lin
Summary: The study designed a multi-channel PSJ actuator driven by a four-stage Marx high-voltage generator, determining its basic discharge characteristics and jet performance, and explored the effect of discharge frequency on jet performance through theoretical analysis and experimental research.
Article
Engineering, Aerospace
Baris Gungordu, Mark Jabbal, Atanas A. Popov
Summary: This study investigates the effect of using different types of piezoceramics and different orifice-diaphragm configurations on the performance of synthetic jet actuators. The results show that the use of PMN-PT piezoceramic leads to higher displacement and jet velocity compared to conventional PZT-5A piezoceramic. A peak exit jet velocity of 99.5 m/s was obtained at a low voltage supply of 40 V. The power conversion efficiency achieved was 72% and a new figure-of-merit of 0.09 MW-1 was defined to evaluate the potential impact for full-scale implementation.
Article
Engineering, Electrical & Electronic
Yuan Xiao, Hanchun Hu, Dongyuan Guo, Yao Tong, Xinlei Guo, Leipeng Yang
Summary: Smart textiles provide wearers with increased functionality, such as sensing and reaction. However, existing fabric-based flexible sensors have complex preparation processes and low sensitivity. This study reports a method combining microdrop jet technology and liquid phase reduction technology to fabricate fabric-based flexible capacitive sensors. The result shows that the sensor has high sensitivity, fast response, and excellent repeatability, demonstrating its potential for applications in healthcare, electronic skin, etc.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Thermodynamics
Jun-Lin Chen, Ying-Hao Liao
Summary: This study experimentally investigates flow interactions downstream of a bluff-body incorporated with an annular plasma actuator. It is found that square wave operation of the actuator leads to stronger discharge and more significant flow effects. The formation of a vortex ring downstream of the bluff-body is shown to have a positive impact on flow control and flame stabilization.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Ying Kang, Zhenbing Luo, Xiong Deng, Yinxin Zhu, Zhixun Xia
Summary: This paper proposes a novel liquid cooling device based on DSJA technology, which efficiently cools the chip. The characteristics of temperature and velocity field of the device are studied numerically, and the entropy generation rate caused by heat transfer and fluid friction is analyzed. The results show that the device effectively reduces temperature and increases velocity, while the frictional entropy generation is mainly distributed near the inlet, outlet, and jet orifice of the channel, and becomes more noticeable with higher velocity.
Article
Engineering, Mechanical
Pawel Gil, Joanna Wilk
Summary: The paper presents preliminary results of an experimental investigation involving four different loudspeakers used for driving a synthetic jet actuator. Parameters like synthetic jet velocity, cavity pressure, sound pressure level (SPL) and heat sink thermal resistance were studied under various input power and driving frequency conditions. The highest synthetic jet momentum velocity and maximum sound pressure level were achieved at diaphragm resonance frequency. Heat sink thermal resistance was lowest for a specific loudspeaker, and synthetic jet velocity reached a maximum for this actuator. Sound pressure level for all tested actuators was found to be dependent on momentum velocity.
Article
Engineering, Multidisciplinary
JunWen Tan, YuanWei Lyu, JingZhou Zhang, JingYang Zhang
Summary: A novel concept of improving square-array jet impingement heat transfer by integrating a synthetic jet actuator into the array unit is proposed and experimentally investigated. The results show that the synthetic jet has minor influence on the stagnation heat transfer of square-array jet but significantly improves the local heat transfer at the central zone of the array unit. Its potential is closely related to the array layout, Reynolds number, and impinging distance.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Engineering, Aerospace
Max Huber, Andreas Zienert, Perez Weigel, Martin Schuller, Hans-Reinhard Berger, Joerg Schuster, Thomas Otto
Summary: This paper analyzes and optimizes synthetic jet actuators (SJAs) using a known one-dimensional analytical model. It found a power law describing the coupling between diaphragm resonance frequency and cavity volume, and calculated optimal orifice dimensions based on cavity height in agreement with literature. A transient oscillation correction is necessary for accurate simulation outcomes.
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY
(2021)
Article
Thermodynamics
Yuan-wei Lyu, Jing-zhou Zhang, Jing-yang Zhang, Yong Shan
Summary: This study uses experimental measurement and numerical simulation to reveal the variation of flow field during the issuing of a Plasma Synthetic Jet (PSJ) actuator. It is found that the high-pressure zone generated by plasma deposition shifts reciprocally between the bottom and top of the cavity. The pressure inside the cavity and the velocity of the PSJ attenuate while oscillating in real-time. The geometry of the actuator significantly affects the performance of the PSJ.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Mechanics
Xi Geng, Weilin Zhang, Zhiwei Shi, Zheng Li, Qijie Sun, Zhikun Sun
Summary: The frequency characteristics of nanosecond plasma synthetic jet actuators were studied using the high-speed Schlieren method, revealing three typical working states: continuous, critical, and discontinuous. The relationship between discharge frequency and actuation states was discussed, defining critical and saturated discharge frequencies, and exploring the effects of geometric parameters on frequency characteristics.