000			01662nam a22001577a 4500
003			OSt
005			20160525153608.0
008			160525b xxu||||| |||| 00| 0 eng d
040			_cNational Acoustics Laboratories
245			_aExhaust silencer using water injection
520	3		_aThis paper describes results from the development of a water injection noise control system applied to an exhaust duct. A mist of water is introduced into an exhaust duct by injectors into the gas ow and is used to reduce the sound pressure level in the exhaust by several mechanisms, particularly through the absorption of energy required for the evaporation of the water vapour. This noise control method is investigated rstly with the aid of CFD software and then tested experimentally. The results from the CFD showed that there are signicant reductions in temperature, pressure and hence energy of the ow. The experimental prototype injection system showed inconclusive results due to systematic error. The instrumentation noise oor in every test was approximately 100dB when the water injectors were activated. It is expected that the increase in the noise oor is created by the injected water causing vibrations in the pipe walls which is picked up by the microphone. It is proposed that a water injection based noise attenuation device could be eective with dierent implementation based on research theoretical results.
700			_aBrandon Cotton....[et.al]
773	0		_tAcoustics 2015 Hunter Valley 15-18 November 2015
856			_uhttp://dspace.nal.gov.au/xmlui/bitstream/handle/123456789/371/p34.pdf?sequence=1&isAllowed=y
942			_2udc _cARTICLE
999			_c2572 _d2572