Acoustic performance of acoustic liner for thermoacoustic oscillation muffler of additive manufacturing heavy-duty gas turbine
ZHENG Runchi1, WANG Qingmei1, LI Zhengyang1, DONG Yisheng1,2, GUI Wanyuan1,2
1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100086, China; 2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100086, China
Abstract：In this study , 316L stainless steel thermoacoustic oscillation muffler liners with different pore structure parameters were fabricated via laser powder bed fusion technology. The acoustic properties were examined in the frequency range below 2 500 Hz, with a focus on transmission loss, combining COMSOL finite element simulations and experimental methods. The results show that below 1 500 Hz, simulation results using the narrow area acoustics and internal perforated plate boundary conditions align well. In the frequency range of 1 500~2 500 Hz, discrepancies arise due to enhanced thermal-viscous effects. When the total perforation area remains constant, the shape of the perforation has little influence on transmission loss. Increasing the pore diameter shifts the peak transmission loss toward lower frequencies and increases its value. When the number of pores is less than 120, increasing the number of pores shifts the peak to higher frequencies and increases its value; however, increasing the number beyond 120 leads to a reduction in the peak value. The integration of additive manufacturing with simulations provides technical support for the optimization of mufflers used for thermoacoustic oscillation control in gas turbine combustion chambers.
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2026, Vol. 31 
