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| 1 | 飞机起落架气动噪声特性仿真与试验显示文摘对某型飞机前起落架的气动噪声特性进行了数值仿真分析和声学风洞试验研究。在典型飞机着陆速度下,采用分离涡(DES)方法模拟起落架周围非定常湍流流场,通过涡声理论计算声源的强度和位置,并利用FW-H(Ffowcs-Williams/Hawkings)方程积分外推法求解出不同部件及其组合件产生的声场,分析其噪声的产生机制、频谱特性及远场指向特性,同时评估各部件对总噪声的贡献量。在声学风洞中对轮胎和轮叉组合件进行气动声学试验,借助麦克风测量获得了噪声的频谱特性。基于部件固体表面积分计算的仿真结果与试验结果在声学远场条件下吻合较好。仿真结果表明:起落架气动噪声是钝体绕流噪声和空腔噪声的叠加,呈现宽频噪声的特性。强度最大的声源主要分布在起落架各部件的固体表面;轮胎噪声对总噪声的贡献最大,其次是轮叉噪声,支柱噪声对总噪声贡献最小。各部件噪声和总噪声均具有偶极子声源的辐射特性。空间可穿透积分面计算的声压级结果比固体表面计算的声压级结果大5dB左右。该研究结果为低噪声起落架设计提供了一定的参考。 | 龙双丽 聂宏 薛彩军 许鑫 | 2012 | 航空学报2012，33，6： | 22 |
| 2 | Control strategies for aircraft airframe noise reduction显示文摘With the development of low-noise aircraft engine, airframe noise now represents a major noise source during the commercial aircraft's approach to landing phase. Noise control efforts have therefore been extensively focused on the airframe noise problems in order to further reduce aircraft overall noise. In this review, various control methods explored in the last decades for noise reduction on airframe components including high-lift devices and landing gears are summarized. We introduce recent major achievements in airframe noise reduction with passive control methods such as fairings, deceleration plates, splitter plates, acoustic liners, slat cove cover and side-edge replacements, and then discuss the potential and control mechanism of some promising active flow control strategies for airframe noise reduction, such as plasma technique and air blowing/suction devices. Based on the knowledge gained throughout the extensively noise control testing, a few design concepts on the landing gear, high-lift devices and whole aircraft are provided for advanced aircraft low-noise design. Finally, discussions and suggestions are given for future research on airframe noise reduction. | Li Yong Wang Xunnian Zhang Dejiu | 2013 | Chinese Journal of Aeronautics2013，26，2： | 14 |
| 3 | 基于边缘射流的起落架气动噪声控制研究显示文摘起落架噪声可以看成是一系列结构件单独引起的气体扰流噪声以及这些不同结构件相对位置引起的干扰噪声的耦合。为了降低起落架气动噪声,提出一种基于边缘射流的主动控制技术。以某型飞机前起落架为研究对象,在其扭力臂背风面施加射流,利用分离涡脱模拟方法对其支柱和扭力臂结构简化模型的周围流场进行非定常计算,获取声源分布,采用FW-H积分获得远场噪声特性。结果表明:边缘射流能够有效抑制干扰噪声和支柱噪声,起落架的中频噪声得到一定幅度的下降,宽频噪声强度也有所减弱;射流改变扭力臂尾涡的脱落状况,可以减轻甚至消除涡脱落对支柱的冲击,从而减弱了支柱表面由于撞击而产生的脉动压力,达到降低声源强度的目的。 | 任旺 薛彩军 赵蓉 | 2016 | 航空工程进展2016，7，1： | 3 |
| 4 | Wall shear-stress extraction by an optical flow algorithm with a sub-grid formulation显示文摘In this study,we developed a novel optical-flow algorithm for determining the wall shear-stress on the surface of objects.The algorithm solves the thin-oil-film equation using a numerical scheme that recovers local features neglected by smoothing filters.A variational formulation with a smoothness constraint was applied to extract the global shear-stress fields.The algorithm was then applied to scalar images generated using direct numerical simulation(DNS)method,which revealed that the errors were smaller than those of conventional methods.The application of the proposed algorithm to recover the wall shear-stress on a low-aspect-ratio wing and on an axisymmetric boattail model taken as examples in this study showed a strong potential for analysing shear-stress fields.Compared to the methods used in previous studies,proposed method reveals more local features of separation line and singular points on object surface. | The Hung Tran Lin Chen | 2021 | Acta Mechanica Sinica2021，37，1： | 1 |
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