{"title":"Resonance and Tones in Dual-Stream Nozzles induced by vortex shedding from struts","authors":"I. Milanović, K. Zaman, C. Miller","doi":"10.2514/6.2018-3939","DOIUrl":"https://doi.org/10.2514/6.2018-3939","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"1 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":"131193383","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}
E. Arcondoulis, A. Zander, C. Doolan, Laura A. Brooks, Yu Liu
{"title":"Airfoil dual acoustic feedback mechanisms at low-to-moderate Reynolds number","authors":"E. Arcondoulis, A. Zander, C. Doolan, Laura A. Brooks, Yu Liu","doi":"10.2514/6.2018-3936","DOIUrl":"https://doi.org/10.2514/6.2018-3936","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"1 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":"129505682","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}
{"title":"Community noise assessment for aircrafts with contra-rotating open rotor power plants","authors":"L. Sanders","doi":"10.2514/6.2018-2819","DOIUrl":"https://doi.org/10.2514/6.2018-2819","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"1 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":"130228899","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}
N. A. Balantrapu, Russell J. Repasky, Liselle A. Joseph, W. Devenport
{"title":"The Dynamic Response of a Pinhole Microphone under Flows of Varying Shear Stress","authors":"N. A. Balantrapu, Russell J. Repasky, Liselle A. Joseph, W. Devenport","doi":"10.2514/6.2018-3933","DOIUrl":"https://doi.org/10.2514/6.2018-3933","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":"127773442","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}
Short circular holes with a low Mach number mean bias flow passing through them can absorb or generate acoustics. A recent semi-analytical model (Yang & Morgans, Journal of Sound and Vibration, 384 (2016) pp. 294-311 & 393 (2017) pp. 41-61) based on the Green’s function method has been shown to be able to capture both the acoustic absorption and generation. The model indicates the importance of accurately capturing the path of the shed vorticity from the hole inlet edge. In the present work, the effect of this vorticity path on the hole acoustics is first studied systematically using the semi-analytical model. As the vorticity path is sensitive to the sharpness of the hole inlet edge, CFD tools are then used to obtain the vortex sheet shape after slightly changing the hole inlet edge shape. The acoustic responses of these modified holes are obtained using the semi-analytical model. A slightly chamfered edge case and a small ellipse edge case are considered to show that a very small change to the shape of the hole inlet edge can give a significant difference in the hole acoustic response.
低马赫数的短圆孔可以吸收或产生声学。最近基于Green函数方法的半解析模型(Yang & Morgans, Journal of Sound and Vibration, 384 (2016) pp. 294-311 & 393 (2017) pp. 41-61)已被证明能够捕获声吸收和产生。该模型表明，准确地捕捉从孔入口边缘开始的脱落涡量路径是非常重要的。本文首次采用半解析模型系统地研究了这种涡度路径对孔洞声学的影响。由于涡量路径对孔进口边缘的锐度敏感，因此在略微改变孔进口边缘形状后，利用CFD工具获得涡片形状。利用半解析模型得到了这些改进孔的声响应。考虑了微倒角边缘情况和小椭圆边缘情况，表明孔入口边缘形状的微小变化可以使孔声响应产生显着差异。
{"title":"On the sensitivity of the acoustics of short circular holes to inlet edge geometries","authors":"Dong Yang, J. Inigo, Holly G. Johnson, A. Morgans","doi":"10.2514/6.2018-3932","DOIUrl":"https://doi.org/10.2514/6.2018-3932","url":null,"abstract":"Short circular holes with a low Mach number mean bias flow passing through them can absorb or generate acoustics. A recent semi-analytical model (Yang & Morgans, Journal of Sound and Vibration, 384 (2016) pp. 294-311 & 393 (2017) pp. 41-61) based on the Green’s function method has been shown to be able to capture both the acoustic absorption and generation. The model indicates the importance of accurately capturing the path of the shed vorticity from the hole inlet edge. In the present work, the effect of this vorticity path on the hole acoustics is first studied systematically using the semi-analytical model. As the vorticity path is sensitive to the sharpness of the hole inlet edge, CFD tools are then used to obtain the vortex sheet shape after slightly changing the hole inlet edge shape. The acoustic responses of these modified holes are obtained using the semi-analytical model. A slightly chamfered edge case and a small ellipse edge case are considered to show that a very small change to the shape of the hole inlet edge can give a significant difference in the hole acoustic response.","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"14 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":"128253530","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}
S. H. Swift, K. Gee, T. Neilsen, Alan T. Wall, J. Downing, Michael M. James
{"title":"Spatiotemporal-correlation analysis of jet noise from a round nozzle high-performance aircraft","authors":"S. H. Swift, K. Gee, T. Neilsen, Alan T. Wall, J. Downing, Michael M. James","doi":"10.2514/6.2018-3938","DOIUrl":"https://doi.org/10.2514/6.2018-3938","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"5 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":"128303949","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}
P. Manjunath, F. Avallone, D. Casalino, D. Ragni, M. Snellen
Acoustic liners are widely used as noise suppression devices, for example in aircraft engines. The effectiveness of the liners is measured through the impedance. In the present study, using a lattice-Boltzmann solver, the response of two liner geometries to grazing acoustic waves is examined. The two geometries have porosity equal to 0.99% and 6.89%, respectively. Impedance is computed using the traditional in-situ method. The results from the simulation are validated against previous experimental data, DNS data and predictions from semi-empirical models. Results show agreement with these reference data, allowing to use the computational setup for further analysis with a realistic liner configuration in the presence of a grazing flow.
{"title":"Characterization of Liners using a Lattice-Boltzmann Solver","authors":"P. Manjunath, F. Avallone, D. Casalino, D. Ragni, M. Snellen","doi":"10.2514/6.2018-4192","DOIUrl":"https://doi.org/10.2514/6.2018-4192","url":null,"abstract":"Acoustic liners are widely used as noise suppression devices, for example in aircraft engines. The effectiveness of the liners is measured through the impedance. In the present study, using a lattice-Boltzmann solver, the response of two liner geometries to grazing acoustic waves is examined. The two geometries have porosity equal to 0.99% and 6.89%, respectively. Impedance is computed using the traditional in-situ method. The results from the simulation are validated against previous experimental data, DNS data and predictions from semi-empirical models. Results show agreement with these reference data, allowing to use the computational setup for further analysis with a realistic liner configuration in the presence of a grazing flow.","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"1 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":"128731760","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}
J. Morgan, Christopher Shoemaker, D. K. Mclaughlin, P. Morris, Z. Berger
{"title":"Analysis of Fluid Insert Noise Reduction Method with PIV","authors":"J. Morgan, Christopher Shoemaker, D. K. Mclaughlin, P. Morris, Z. Berger","doi":"10.2514/6.2018-3610","DOIUrl":"https://doi.org/10.2514/6.2018-3610","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"98 1-3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114026126","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}
{"title":"Effect of rounded corners on the flow and noise from a cube","authors":"Yanan Wang, David J. Thompson, Zhiwei Hu","doi":"10.2514/6.2018-2960","DOIUrl":"https://doi.org/10.2514/6.2018-2960","url":null,"abstract":"","PeriodicalId":429337,"journal":{"name":"2018 AIAA/CEAS Aeroacoustics Conference","volume":"181 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":"114305949","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}
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