In this study, high-voltage pulses are used to drive dielectric barrier discharge plasma actuators (DBDAs) for flow control purposes. The rising/falling edges of the pulse are kept nearly constant in nanosecond timescale, while the pulse width is varied from nanosecond to microsecond timescale. The impact of pulse width on the characteristics of the DBDA is investigated experimentally with a high-speed schlieren system and a high-fidelity force balance. In the case of small pulse width, a pressure wave propagating at the local speed of sound is produced each time at discharge ignition, and a vertical jet plume is induced after multiple discharge pulses due to heat accumulation (buoyancy effect). As a comparison, for cases with large pulse widths, two pressure waves are created sequentially with a time lag close to the pulse width, and a starting vortex followed by a near-wall jet is produced, demonstrating that significant momentum similar to that of DBD driven by sinusoidal high voltage has been imparted to the near-wall flow. A proportional increase of the induced body force with the cube root of the pulse width is demonstrated, while the pulse energy decreases nonlinearly as the pulse width increases. The maximum body force of 2.49 mN m⁻¹ is reached at a pulse width of 380 μs.

在这项研究中，高压脉冲用于驱动介质阻挡放电等离子体致动器 (DBDA) 以实现流量控制。脉冲的上升/下降沿在纳秒时间尺度上几乎保持不变，而脉冲宽度从纳秒到微秒时间尺度变化。使用高速纹影系统和高保真力平衡实验研究了脉冲宽度对 DBDA 特性的影响。在脉冲宽度较小的情况下，每次放电点火时都会产生以当地声速传播的压力波，多次放电脉冲后因热量积聚（浮力效应）而诱发垂直喷射羽流。作为比较，对于大脉冲宽度的情况，两个压力波依次产生，时间滞后接近脉冲宽度，并且产生了一个起始涡流，然后是近壁射流，这表明与正弦高压驱动的 DBD 类似的显着动量已被赋予近壁流。证明了诱导体力与脉冲宽度的立方根成比例增加，而脉冲能量随着脉冲宽度的增加而非线性地减少。最大体力 2.49 mN·m^-1在380的脉冲宽度达到μ秒。