摘要
Abstract
The low-boom design is one of the key technologies for the design of a supersonic civil aircraft.For a low-boom design,one of the key problems is how to choose the appropriate obj ective,which is associated with the evaluation of low-boom performance.To apply the sonic boom loudness level to low-boom design,this paper introduces the Stevens’loudness method into the existing low-boom optimization design platform for supersonic civil aircraft and uses the Seeb-ALR model as an example.The Stevens’loudness level of the ground boom and the over-pressure value of the near field are selected as the optimization targets,and the cone contour is used as the optimization obj ective for the low-boom design.The results show that,compared with the original model,the loudness level/near field over-pressure value optimization reduces the maximum over-pressure value by 1 8.4% and 40.6% ,and the ground boom loudness level by 2.2PLdB and 1.4PLdB,respectively.The optimization results verify the applicability of the Stevens’loudness level in the low-sonic design of supersonic civil aircraft,accurately reflecting the impact of boom on ground personnel,which can be used in the low-boom design.Selecting different boom evaluation parameters as the optimization targets,there are large differences between the obtained model optimization contours and the near/far field over-pressure distribution patterns.Compared with the near field over-pressure value optimization, the optimization of boom loudness level can reduce the ground boom loudness more effectively by changing the distribution of over-pressure.关键词
超声速民机/声爆/低声爆优化/远场传播/响度级Key words
supersonic civil aircraft/boom/low-boom design/far field propagation/loudness level分类
航空航天
