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2018 AIAA/CEAS Aeroacoustics Conference最新文献

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Experimental investigation of the output duct role in the transient bleed valve noise 输出管道对瞬态排气阀噪声影响的实验研究
2018 AIAA/CEAS Aeroacoustics Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3606
P. Laffay, S. Moreau, Marc C. Jacob, J. Regnard
{"title":"Experimental investigation of the output duct role in the transient bleed valve noise","authors":"P. Laffay, S. Moreau, Marc C. Jacob, J. Regnard","doi":"10.2514/6.2018-3606","DOIUrl":"https://doi.org/10.2514/6.2018-3606","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123010932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Assessment of Axial Wave Number and Mean Flow Uncertainty on Acoustic Liner Impedance Eduction 声学线性阻抗衰减中轴波数和平均流不确定性的评估
2018 AIAA/CEAS Aeroacoustics Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3444
D. Nark, Michael G. Jones, E. Piot
{"title":"Assessment of Axial Wave Number and Mean Flow Uncertainty on Acoustic Liner Impedance Eduction","authors":"D. Nark, Michael G. Jones, E. Piot","doi":"10.2514/6.2018-3444","DOIUrl":"https://doi.org/10.2514/6.2018-3444","url":null,"abstract":"A key parameter in designing and assessing advanced broadband acoustic liners to achieve the current and future noise reduction goals is the acoustic impedance presented by the liner. This parameter, intrinsic to a specific liner configuration, is dependent on sound pressure level and grazing flow velocity. Current impedance eduction approaches have, in general, provided excellent results and continue to be employed throughout the acoustic liner community. However, some recent applications have indicated a possible dependence of the educed impedance on the direction of incident waves relative to the mean flow. The purpose of the current study is to investigate this unexpected behavior for various impedance eduction methods based on the Pridmore-Brown and convected Helmholtz equations. Specifically, the effects of flow profile and axial wavenumber uncertainties on educed impedances for upstream and downstream sources are investigated. The uniform flow results demonstrate the importance of setting a correct Mach number value in obtaining consistent educed impedances for upstream and downstream sources. In fact, the consistency of results over the two source locations was greatly improved by a slight modification of the uniform flow Mach number. In addition, uncertainty in educed axial wavenumber was also illustrated to correlate well with differences in the educed impedances, even with modified uniform flow Mach number. Finally, while less straightforward than in the uniform flow case, it appears that modification of the mean flow profile may also improve consistency of results for upstream and downstream results when shear flow is included.","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126275686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
Analytic solutions for reduced leading-edge noise aerofoils 降低机翼前缘噪声的解析解决方案
2018 AIAA/CEAS Aeroacoustics Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3284
Lorna J. Ayton, Chaitanya C. Paruchuri
{"title":"Analytic solutions for reduced leading-edge noise aerofoils","authors":"Lorna J. Ayton, Chaitanya C. Paruchuri","doi":"10.2514/6.2018-3284","DOIUrl":"https://doi.org/10.2514/6.2018-3284","url":null,"abstract":"This paper presents an analytic solution for the sound generated by an unsteady gust interacting with a semi-infinite at plate with a piecewise linear periodic leading edge. The Wiener-Hopf method is used in conjunction with a non-orthogonal coordinate transformation and separation of variables to allow analytical progress. A fully analytic solution is obtained in terms of a modal expansion for the far-field noise which is obtained by summing only a finite number of cuton modes, allowing very quick evaluation. The analytic solution is compared to experimental results for five test case leading-edge geometries. Good agreement is seen indicating the analytic model is capturing the key features of the interaction such as the destructive interference from the tip and root. In four of the five test cases the serrated edges show large reductions of noise compared to the straight edge at mid and high frequencies, however the square wave geometry is seen to be ineffective at noise reduction for high frequencies.","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120945294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Airfoil trailing-edge noise prediction combining a random particle-mesh method with a Helmholtz solver 结合随机粒子网格法和亥姆霍兹求解器的翼型尾缘噪声预测
2018 AIAA/CEAS Aeroacoustics Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3596
A. Kadar, S. L. Bras, H. Bériot, C. Schram, V. Korchagin, W. D. Roeck, W. Desmet
{"title":"Airfoil trailing-edge noise prediction combining a random particle-mesh method with a Helmholtz solver","authors":"A. Kadar, S. L. Bras, H. Bériot, C. Schram, V. Korchagin, W. D. Roeck, W. Desmet","doi":"10.2514/6.2018-3596","DOIUrl":"https://doi.org/10.2514/6.2018-3596","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125159353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Up in the Air: In-Flight Wavenumber Characterization of Surface Pressure Fluctuations at Transonic Conditions 在空中:跨音速条件下表面压力波动的飞行波数表征
2018 AIAA/CEAS Aeroacoustics Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3275
S. Haxter, C. Spehr
{"title":"Up in the Air: In-Flight Wavenumber Characterization of Surface Pressure Fluctuations at Transonic Conditions","authors":"S. Haxter, C. Spehr","doi":"10.2514/6.2018-3275","DOIUrl":"https://doi.org/10.2514/6.2018-3275","url":null,"abstract":"One way of representing surface pressure fluctuations is to display them in frequency-dependent wavenumber spectra. They can be used to feed structural vibration predictions model. However, mostly models and experimental data from wind tunnel and water tunnel experiments have been employed. Apart from possible scaling effects, only hydrodynamic pressure fluctuations are incorporated in these models. Some data from flight tests exists, but again this data is limited to sections of the aircraft where the hydrodynamic pressure fluctuations are dominant. In order to consider both, acoustic and hydrodynamic surface pressure fluctuations in flight a beamforming approach is used in the following to determine wavenumber spectra of pressure fluctuations in cruise flight. This allows for the simultaneous characterization of both, hydrodynamic and acoustic pressure fluctuations and for the discrimination between the two. The wavenumber spectra can be used directly as input for the prediction of structural vibration.","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122652329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Integration of Acoustic Installation Effects in Inverse Generalized BeamForming Algorithm 反广义波束形成算法中声学安装效应的集成
2018 AIAA/CEAS Aeroacoustics Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-2965
N. Wyer, D. Logothetis, C. Schram
{"title":"Integration of Acoustic Installation Effects in Inverse Generalized BeamForming Algorithm","authors":"N. Wyer, D. Logothetis, C. Schram","doi":"10.2514/6.2018-2965","DOIUrl":"https://doi.org/10.2514/6.2018-2965","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131402287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Trailing Edge Noise of Innovative Mini-RPA Propeller Blade Geometry 创新型Mini-RPA螺旋桨叶片几何形状的尾缘噪声
2018 AIAA/CEAS Aeroacoustics Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3451
H. Akila, B. Marinus, S. Larbi
{"title":"Trailing Edge Noise of Innovative Mini-RPA Propeller Blade Geometry","authors":"H. Akila, B. Marinus, S. Larbi","doi":"10.2514/6.2018-3451","DOIUrl":"https://doi.org/10.2514/6.2018-3451","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131427610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Effects of Free Stream Disturbance on the Development of the Compressible Flow around a Square Cylinder at Subsonic Mach Numbers 自由流扰动对亚音速马赫数下方圆柱可压缩流动发展的影响
2018 AIAA/CEAS Aeroacoustics Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-4105
Yohei Inoue, Tsuyoshi Kanuma, Yuma Tasai, H. Maekawa
{"title":"Effects of Free Stream Disturbance on the Development of the Compressible Flow around a Square Cylinder at Subsonic Mach Numbers","authors":"Yohei Inoue, Tsuyoshi Kanuma, Yuma Tasai, H. Maekawa","doi":"10.2514/6.2018-4105","DOIUrl":"https://doi.org/10.2514/6.2018-4105","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131525660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using the Linearized Navier-Stokes Equations to Model Acoustic Liners 用线性化Navier-Stokes方程模拟声学衬垫
2018 AIAA/CEAS Aeroacoustics Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3783
M. J. H. Jensen, Elin Svensson, K. Shaposhnikov
{"title":"Using the Linearized Navier-Stokes Equations to Model Acoustic Liners","authors":"M. J. H. Jensen, Elin Svensson, K. Shaposhnikov","doi":"10.2514/6.2018-3783","DOIUrl":"https://doi.org/10.2514/6.2018-3783","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132361175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Unsteady coherent surface-pressure fluctuations from time-averaged flow data with given two-point statistics 给定两点统计的时间平均流量数据的非定常相干表面压力波动
2018 AIAA/CEAS Aeroacoustics Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-4097
F. Avallone, D. Casalino, D. Ragni
{"title":"Unsteady coherent surface-pressure fluctuations from time-averaged flow data with given two-point statistics","authors":"F. Avallone, D. Casalino, D. Ragni","doi":"10.2514/6.2018-4097","DOIUrl":"https://doi.org/10.2514/6.2018-4097","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121870510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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