Polish-Japanese Academy of Information Technology, 02-008 Warsaw, Poland.
Institute of Information Technology, Warsaw University of Life Sciences, 02-776 Warsaw, Poland.
Sensors (Basel). 2021 Dec 21;22(1):10. doi: 10.3390/s22010010.
This paper describes the influence of the presence of an obstacle near the flue pipe's mouth on the air jet, which directly affects the parameters of the sound generated by the flue pipe. Labial pipes of the most common types of mouth were tested. The method of interval calculus was used instead of invasive measuring instruments. The obtained results prove that the proximity of an obstacle affects the sound's fundamental frequency, as the airflow speed coming out of the flue pipe's mouth changes. The relationship between the airflow speed, the value of the Reynolds number, and the Strouhal number was also established. The thesis of the influence of the proximity of an obstacle on the fundamental frequency of the sound of a flue pipe was generalized, and formulas for calculating the untuning of the sound of the pipe were presented for various types of mouth.
本文描述了在烟道口附近存在障碍物对空气射流的影响，这直接影响到烟道产生的声音参数。对最常见类型的烟道唇管进行了测试。使用区间演算方法代替了侵入式测量仪器。所获得的结果证明，障碍物的接近会影响声音的基频，因为烟道口喷出的气流速度会发生变化。还建立了气流速度、雷诺数和斯特劳哈尔数之间的关系。本文还概括了障碍物对烟道声音基频的影响，并针对各种类型的烟道唇管提出了计算管道失谐声音的公式。
