M.C. Peters, A. Hirschberg, J.A. v.d. Konijnenberg, F.J. Huijsmans, R.W. de Leeuw, S. Op de Beek, A.P. Wijnands

Using a two microphone method we obtained reflection coefficient R and end correction b data for an open pipe termination, with random errors of 0.2% in R and 1 % in b for Helmholtz numbers ka below 0.3 and Mach numbers M below 0.1. The systematic errors due to the room acoustics are less than 0.2% for ka < 0.1 and 0.5% for 0.1 < ka < 0.3. This allows an experimental study of the influence of various parameters: pipe geometry, amplitude, frequency, Strauhal number and Mach number. The data are compared with existing theories for an unflanged open pipe end. The aero-acoustic behaviour ofthe pipe end is dramatically influenced by the presence of a horn. For a critical range of parameters the horn is a source of sound, which explains human whistling.

DGLR/AIAA 14th Aeroacoustics Conference, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 6 Seiten

DGLR-Bericht, 1992, 1992-03, DGLR/AIAA 14th Aeroacoustics Conference - Proceedings; S.350-355; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1992