Acoustic liner and engine nacelle

• Main Authors: QIU SHENG, CHEN CHUIWEN, WANG LUYAO, LI DANWANG
• Format: Patent
• Language: Chinese; English
• Published: 26.07.2024
• Subjects: ACOUSTICS; ACOUSTICS NOT OTHERWISE PROVIDED FOR; AIR INTAKES FOR JET-PROPULSION PLANTS; BLASTING; COMBUSTION ENGINES; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS; GAS-TURBINE PLANTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; MUSICAL INSTRUMENTS; PHYSICS; SOUND-PRODUCING DEVICES; WEAPONS

The acoustic liner comprises a perforated panel, a honeycomb core and a back plate, a scale-shaped structure is arranged on the surface of the perforated panel, the scale-shaped structure comprises a plurality of layers of scale-shaped protrusions, and grooves are formed in the scale-shaped protrusions. The acoustic liner structure can reduce the flow resistance, and further reduce the acoustic liner surface resistance formed when the vortex impacts the edge of the opening of the resonant cavity, thereby achieving the effects of reducing resistance and noise, further improving the sound absorption performance in a high sound intensity environment, and widening the effective sound absorption frequency band. The utility model further provides an engine nacelle comprising the acoustic liner mechanism. 提供一种声衬，包括穿孔面板、蜂窝芯以及背板，穿孔面板的表面设有鳞形结构，鳞形结构包括多层鳞状凸起，鳞状凸起上设有凹槽。该声衬结构能够减少流动阻力，进一步降低旋涡撞击到共振腔开孔边缘形成的声衬表面阻力，从而达到减阻降噪的效果，进而提升高声强环境下的吸声性能，拓宽有效吸声频带。还提供一种包括上述声衬机构的发动机短舱。