Experimental investigations of sound reflection from hot and subsonic flow duct termination
2014 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 333, no 3, 788-800 p.Article in journal (Refereed) Published
The knowledge of the reflection properties of open end jet ducts is important for different applications, where the flow and high temperature conditions are involved and add complexity to the problem. In this paper, the magnitude of the reflection coefficients together with the respective end-corrections is experimentally determined for hot flow duct openings. A Mach number range up to 0.3 for cold jets and up to 0.12 for a jet temperature of 200 degrees C is treated. The experimental results are compared with the numerical model proposed by Munt (Acoustic transmission properties of a jet duct with subsonic jet flow: 1. The cold jet reflection coefficient, Journal of Sound and Vibration 142 (1990) 413-436) and a good correlation in plane-wave region is demonstrated. To reduce experimental uncertainty, the sound reflection properties at the duct opening are obtained by using an overdetermined two-microphone technique with the implementation of a three pressure transducer array. By introducing a modified multistep version of the stepped sine excitation, the accuracy of data acquisition process is improved without compromising the measurement time.
Place, publisher, year, edition, pages
2014. Vol. 333, no 3, 788-800 p.
Acoustic transmission, Acquisition process, Experimental investigations, Experimental uncertainty, High temperature condition, Pressure transducer array, Reflection properties, Two-microphone technique
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-140366DOI: 10.1016/j.jsv.2013.09.030ISI: 000328926200012ScopusID: 2-s2.0-84888298709OAI: oai:DiVA.org:kth-140366DiVA: diva2:690463
QC 201401232014-01-232014-01-232014-01-23Bibliographically approved