| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide gas turbine exhaust equipment which controls the occurrence of a low-frequency noise source to control low-frequency noise. <P>SOLUTION: An exhaust gas 14 discharged from a gas turbine 11 is discharged in the air through an exhaust gas flue 21, a curved section 23, and a chimney 22. A porous plate 31 is placed on the exhaust gas flue 21 and a porous plate 32 is placed on the chimney 22 in order to control low-frequency noise generation by preventing a separation phenomenon of the exhaust gas 14 in the curved section 23. The porous plates 31, 32 are positioned at parts where an acoustic first mode, an acoustic second mode, and an acoustic third mode are all at low levels nd the opening rates of the porous plates 31, 32 are between 20% and 70%. By positioning the porous plates 31, 32, the exhaust gas 14 is rectified, separation is controlled, acoustic dumping is performed, and sympathetic vibration is controlled so that the generation of low-frequency noise is controlled. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
