高升力构型远场气动噪声Kevlar风洞实验研究

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• 英文论文题名：Far-field aero-acoustic measurement of High-Lift configuration in the innovative test section with Kevlar and perforated plate
• 论文作者：李玲 ; 刘沛清 ; 郭昊 ; 田云
• 英文论文作者：Li Ling ; Liu Peiqing ; Guo Hao ; Tian Yun ; School of Aeronautic Science and Engineering ; Beihang University
• 年：2016
• 作者机构：北京航空航天大学航空科学与工程学院;
• 论文关键词：远场气动噪声测量 ; 高升力构型 ; Kevlar布 ; 穿孔板
• 英文论文关键词：far-field aero-acoustic measurements ; high-lift configuration ; Kevlar cloth ; perforated plate
• 会议召开时间：2016-11-04
• 会议录名称：2016年度全国气动声学学术会议论文摘要集
• 语种：中文
• 分类号：V211.74
• 学会代码：LTLX
• 会议名称：2016年度全国气动声学学术会议
• 会议地点：中国北京
• 主办单位：中国航空学会航空声学专业委员会、中国航空学会气动声学专业委员会、中国商飞上海飞机设计研究院、北京航空航天大学
• 学会名称：北京航空航天大学流体力学教育部重点实验室
• 页数：7
• 文件大小：1827k
• 原文格式：D
• 会议级别：全国

摘要

对于研究气动噪声产生机理和降噪控制等在风洞中进行气动和噪声实验都是十分有效的一种方法。现有的风洞很难同时达到气动和噪声的实验要求,即在基本没有干扰的稳定环境下测量气动特性和在具有良好声穿透性的无反射环境下测量噪声。北京航空航天大学D5气动声学风洞为30P30N这种高升力构型的远场气动噪声实验进行了实验段侧壁的改造。翼型吸力面一侧的侧壁用穿孔板支撑Kevlar布,而另一侧压力面的侧壁只由Kevlar组成。在改造后的实验段里进行了气动和噪声的测量,验证其流场和声场性能。翼型表面压力分布与计算和JAXA风洞结果吻合很好证明在D5气动声学风洞中流场能很好的被捕捉和具有流场的相似性。而对于声学测量结果,无论是声谱形状还是尖频的频率都能与已有的结果近似。因此可以说明,改造的实验段,克服了开口和固壁风洞的缺陷,实现了在气动声学风洞中同时进行高升力构型的气动和远场噪声测量实验,特别是对于中小型风洞而言。
Both aerodynamic and aero-acoustic experiments in wind tunnels are necessary for the study of aeroacoustic mechanism and noise reduction methods.The existing wind tunnels have difficulties in simultaneously measuring aerodynamic features in a stable condition with less flow interference and aero-acoustic characteristics in a nonreflecting environment with good sound transmission.The sidewall of test section in D5 aero-acoustic wind tunnel at Beihang University is recently upgraded for the far-field aero-acoustic experiments of 30P30N high-lift configuration.The sidewall on the suction side consists of Kevlar cloth tensioned with a perforated plate and the other sidewall on the pressure side only consists of Kevlar cloth.Both aerodynamic and aero-acoustic features are measured to validate the performance of this innovative test section.The surface pressure distributions reveal that the aerodynamic characteristics can be reliably captured.For acoustic results, both noise spectral shape and tonal frequencies agree well with previous investigations.Thus, the innovation test section overcomes the limitations and disadvantages of open and closed hard-wall wind tunnels and can be applied for aerodynamic and far-field aero-acoustic experiments of high-lift devices in aero-acoustic wind tunnels, especially for small scale wind tunnels

引文

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