Jet Flapping Control with Acoustic Excitation

• 作者: Ken Hirashita Shouichiro Iio Tomomi Uchiyama Toshihiko Ikeda Yoshiaki Haneda Yusuke Katayama
• 来源期刊: 流量控制、测量及可视化(英文)
• 学科: 医学
• 关键词: JET CONTROL RECTANGULAR JET VORTEX Hot Wire VISUALIZATION
• 年，卷（期）: 2013,（2）
• 页码范围: 49-56
• 页数: 8页
• 分类号: R73

摘要

The dynamics of flapping motion of a rectangular jet under acoustic excitation is studied experimentally by means of hot-wire measurement and flow visualization with smoke method. The excitation sufficiently enables“phase-lock”, which permitted us to extract the organized wave motion from a background field of finite turbulent fluctuations. The mean and fluctuation velocity are investigated and focused on the excitation frequency and the Reynolds number. As the excitation frequency decreases, it was found that the jet flapping and the jet spread were enhanced. The excitation with sub-harmonic frequency has significant effects on the rectangular jet behavior. The maximum value of the periodic velocity fluctuation strongly depends on the excitation frequency.