用于低能量气流产生的电液动力空气放大器——概念的实验验证

D. Rubinetti, Kamran Iranshahi, Daniel I. Onwude, B. Nicolaï, Lei Xie, T. Defraeye
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引用次数: 3

摘要

利用电流体动力学(EHD),我们可以以低能量的方式推动空气。EHD气流,或称离子风,是在一组电极上施加高电压梯度时产生的。空气通过电晕放电在电极之间电离,并在电场中加速,与周围空气交换动量。虽然电离过程是节能的,但从高压工程的角度来看,达到有竞争力的流量仍然是一个挑战。为了提高EHD产生的流量,本研究通过实验研究了一种称为EHD空气放大的新概念。该概念使用离子风作为排气流,通过空气放大康达效应诱导更显著的体积流。由于空气放大中EHD和介电结构之间复杂的相互作用,概念上的EHD空气放大装置是按阶段设计的,从一个简单的发射集电极配置开始。首先,在150 × 150 × 500 mm3通道中研究了EHD的规则流动。然后,加入介电材料,以确定其对电场的影响。随后研究了会聚喷嘴对ehd产生气流的影响。最后,利用汇聚的喷嘴气流在平板上形成排气流,以促进周围空气的空气放大。我们展示了EHD空气放大系统的概念验证。在电压阈值为14 kV后,测量放大系数为3的放大气流。在22 kV电击穿前不久,获得了约15 m3 h−1的最大气流速率。与常规EHD相比,我们在投入相同电能的情况下实现了更高的空气动力学性能。与常规EHD相比,EHD空气放大的流量功率比提高到66%。提出的EHD空气放大器在大气压下工作。它为进一步的优化研究奠定了基础,将EHD空气放大定位为一种低能耗、低维护、电机和无噪音的气流产生技术。
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Electrohydrodynamic air amplifier for low-energy airflow generation—An experimental proof-of-concept
With electrohydrodynamics (EHD), we can propel air in a low-energy fashion. EHD airflow, or ionic wind, arises when a high voltage gradient is applied to a set of electrodes. The air ionizes between electrodes via corona discharge and accelerates in an electric field, exchanging momentum with the surrounding air. While the ionization process is energy-efficient, reaching competitive flow rates remains challenging from a high-voltage engineering perspective. To increase EHD-generated flow rates, this study experimentally investigates a novel concept called EHD air amplification. The concept uses ionic wind as bleed flow to induce a more significant bulk flow by the air-amplifying Coanda effect. Due to the complex interactions between EHD and dielectric structures for air amplification, the conceptual EHD air amplifier device is designed stage-wise, starting with a simple emitter-collector electrode configuration. First, regular EHD flow was studied in a 150 × 150 × 500 mm3 channel. Then, a dielectric material was added to determine its influence on the electric field. The impact of a converging nozzle on the EHD-generated airflow was subsequently studied. Lastly, the converged nozzle airflow was used to create a bleed flow on a plate to facilitate air amplification of the surrounding air. We show the proof-of-concept for an EHD air amplification system. After a voltage threshold of 14 kV, amplified airstreams up to an amplification factor of 3 were measured. Maximum airflow rates of about 15 m3 h−1 were obtained shortly before electric breakdown at 22 kV. Compared to regular EHD, we achieved a higher aerodynamic performance for the same electric energy invested. The flow rate to electric power ratio increased to 66% in EHD air amplification compared to regular EHD. The proposed EHD air amplifier operates at atmospheric pressure. It lays the groundwork for further optimization studies to position EHD air amplification as a low-energy, low-maintenance, motor- and noiseless airflow generation technology.
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