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霍施宇,杨嘉丰,邓云华.排气道钛合金环形声衬声学特性试验[J].航空动力学报,2020,(2):272~279
排气道钛合金环形声衬声学特性试验
Acoustic characteristics test on aft-fan duct with titanium alloy annular acoustic liner
投稿时间:2019-08-18  
DOI:10.13224/j.cnki.jasp.2020.02.006
中文关键词:  排气道  钛合金声衬  声学试验  切向流  温度梯度  降噪
英文关键词:aft-fan duct  titanium alloy liner  acoustic test  grazing flow  temperature gradient  noise reduction
基金项目:
作者单位
霍施宇 Aircraft Strength Research Institute of China,Aviation Industry Corporation of China Limited,Xi’an 710065,China 
杨嘉丰 Aircraft Strength Research Institute of China,Aviation Industry Corporation of China Limited,Xi’an 710065,China
School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China 
邓云华 Manufacturing Technology Institute,Aviation Industry Corporation of China Limited,Beijing 100024,China 
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中文摘要:
      根据钛合金蜂窝声衬潜在的应用环境,提出了考虑温度梯度影响的环形声衬消声效果的试验方法并研制了模拟发动机风扇排气道声学试验台,开展了钛合金环形声衬的声学特性试验研究。针对2 500 Hz、2阶周向模态的入射噪声和马赫数为02的切向来流工况,设计并制备了钛合金环形声衬,分别通过管道内声模态测试和远场指向性测试研究钛合金环形声衬的声学特性。试验结果表明:设计的钛合金声衬在目标工况下管道内降噪量为319 dB,远场1 m半径、30°~120°范围内的降噪量都超过20 dB;增加切向流速会扩展降噪频谱带宽,使降噪频谱峰值由低频向高频移动;增加背板温度对降噪频谱带宽几乎没有影响,但会使得降噪频谱峰值由低频向高频移动。
英文摘要:
      Considering the potential application environment properties of titanium alloy honeycomb acoustic liner, an experimental method of the acoustic test of the annular acoustic liner with the influence of temperature gradient was proposed, and a simulated engine aft-fan duct acoustic test rig was developed. Then the acoustic test on titanium alloy annular acoustic liner was carried out. In view of the noise of 2 500 Hz and 2nd-order circumferential mode and the grazing flow with Mach number of 02, a titanium alloy annular acoustic liner was designed and prepared. The acoustic characteristics of the titanium alloy annular acoustic liner were studied by the means of duct acoustic mode test and far-field directivity test, respectively. Results showed that the noise reduction of the designed titanium alloy liner in the duct was 319 dB under the target operating conditions, and the 1 m far-field noise reduction appeared to be over 20 dB between 30° to 120°. Increasing the velocity of grazing flow expanded the bandwidth of the noise reduction spectrum and shifted the peak value of the spectrum from low frequency to high frequency. Increasing the temperature of the backplane of liner had little effect on the bandwidth of noise, but it shifted the peak value of noise reduction spectrum from low frequency to high frequency.
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