... ranging from 0.09 to 4.0. The far-field acoustic noise is measured by a linear microphone array covering polar angles from 25 deg to 80 deg relative to the jet axis. In both jets, the lower forcing azimuthal modes ( m = 0 and 1) are less effective than the higher modes ( m = 2 , 3, and ± 4 ), which have...

... literature. 04 05 2007 07 05 2007 09 01 2008 entropy acoustic noise aerospace engines combustion nozzles electric heating pipe flow Mach number The total noise emitted by a combustion chamber consists of direct and indirect combustion noise ( 1 ). Only the direct...

... of the thermocouples was determined using a chopped laser beam directed on the thermocouple junction and was found to be approximately constant for the here regarded frequency ranges. 01 10 2005 01 02 2006 jet engines acoustic noise combustion nozzles electric heating Combustion...