{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T02:39:15Z","timestamp":1760236755062,"version":"build-2065373602"},"reference-count":41,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2021,12,21]],"date-time":"2021-12-21T00:00:00Z","timestamp":1640044800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This paper describes the influence of the presence of an obstacle near the flue pipe\u2019s 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\u2019s fundamental frequency, as the airflow speed coming out of the flue pipe\u2019s 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.<\/jats:p>","DOI":"10.3390\/s22010010","type":"journal-article","created":{"date-parts":[[2021,12,21]],"date-time":"2021-12-21T09:50:43Z","timestamp":1640080243000},"page":"10","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["The Dependence of Flue Pipe Airflow Parameters on the Proximity of an Obstacle to the Pipe\u2019s Mouth"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7482-6425","authenticated-orcid":false,"given":"Damian","family":"W\u0119grzyn","sequence":"first","affiliation":[{"name":"Polish-Japanese Academy of Information Technology, 02-008 Warsaw, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3433-3906","authenticated-orcid":false,"given":"Piotr","family":"Wrzeciono","sequence":"additional","affiliation":[{"name":"Institute of Information Technology, Warsaw University of Life Sciences, 02-776 Warsaw, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2033-6372","authenticated-orcid":false,"given":"Alicja","family":"Wieczorkowska","sequence":"additional","affiliation":[{"name":"Polish-Japanese Academy of Information Technology, 02-008 Warsaw, Poland"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,21]]},"reference":[{"key":"ref_1","first-page":"1","article-title":"Theorie der Luftschwingungen in R\u00f6hren mit offenen Enden","volume":"57","author":"Helmholtz","year":"1860","journal-title":"J. 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