Attenuation of pressure waves by sidewall mufflers with finite backing volume has been studied both analytically and experimentally. The mufflers are to suppress acoustic waves generated in a pulsed flowing gas laser system in which an initial SPL=180 dB and flow Mach number up to 0.5 are typical. Experiments were carried out in a shock tube in which independent control of a flow Mach number and reflected wave properties was achieved using a driven section end-plate with various thicknesses and porosities. Pressure waves with both step (shock wave) and triangular waveforms were considered. Two quasi-lD theories were developed: weak wave and general nonlinear. Agreement betweentheoretical and experimental results is good. (DePo)
Pressure wave altenuation in mufflers with finite backing volume
Druckwellendaempfung in Schalldaempfern mit finitem Ausgleichsvolumen
AIAA-Papers ; 1-9
1979
9 Seiten, 13 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
Kraftfahrwesen | 1977
|Idle relief mufflers and outboard motors having idle relief mufflers
Europäisches Patentamt | 2016
|