Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)最新文献
Xuren Zhu, Joel C. Lisanti, T. Guiberti, W. Roberts
Due to their complex nature, a clear and comprehensive understanding of the mechanisms driving the combustion dynamics of pulse jets is not yet available. The present work intends to fill this gap by shedding some light on general operational properties of an active valve resonant pulse combustor as well as fundamental mechanisms. Pressure sensors and ion probes were used to quantify the global performance of the pulse combustor in naturallyaspirated mode or for different forced air flow-rates. It was shown that performance, here indicated by the pressure gain, improves when the forced air flow-rate increases. For a subset of operating conditions, infrared and thermocouple thermometry was used to measure side wall temperatures. Gas sampling was also used to infer species concentrations inside the combustor and along its main axis. These measurements highlighted the presence of a secondary flame located in the tail pipe, near the exhaust. A possible mechanism responsible for this secondary flame was proposed.
{"title":"Correction: A Preliminary Investigation of the Secondary Flame and Operational Properties of an Actively-valved Pulse Jet","authors":"Xuren Zhu, Joel C. Lisanti, T. Guiberti, W. Roberts","doi":"10.2514/6.2020-0922.c1","DOIUrl":"https://doi.org/10.2514/6.2020-0922.c1","url":null,"abstract":"Due to their complex nature, a clear and comprehensive understanding of the mechanisms driving the combustion dynamics of pulse jets is not yet available. The present work intends to fill this gap by shedding some light on general operational properties of an active valve resonant pulse combustor as well as fundamental mechanisms. Pressure sensors and ion probes were used to quantify the global performance of the pulse combustor in naturallyaspirated mode or for different forced air flow-rates. It was shown that performance, here indicated by the pressure gain, improves when the forced air flow-rate increases. For a subset of operating conditions, infrared and thermocouple thermometry was used to measure side wall temperatures. Gas sampling was also used to infer species concentrations inside the combustor and along its main axis. These measurements highlighted the presence of a secondary flame located in the tail pipe, near the exhaust. A possible mechanism responsible for this secondary flame was proposed.","PeriodicalId":93413,"journal":{"name":"Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)","volume":"27 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77955753","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":"CFD Concepts for In-Tunnel Simulation of Low Speed Wind Tunnels with Closed Test Section","authors":"R. Rudnik, S. Melber-Wilkending","doi":"10.2514/6.2020-0380","DOIUrl":"https://doi.org/10.2514/6.2020-0380","url":null,"abstract":"","PeriodicalId":93413,"journal":{"name":"Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77799131","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 CO2and N2Dilution on Forced Ignition of Jet A/air Mixtures","authors":"Kaz Teope, Jonathan M. Bonebrake, D. Blunck","doi":"10.2514/6.2020-0430","DOIUrl":"https://doi.org/10.2514/6.2020-0430","url":null,"abstract":"","PeriodicalId":93413,"journal":{"name":"Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85549528","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}
Sam Siewert, M. Andalibi, S. Bruder, Jonathan M. Buchholz, Doug Chamberlain, Alexandra L. Lindsey, Trevis Shiroma, David Stockhouse
Embry Riddle Aeronautical University Prescott has designed and prototyped a small UAS (Unmanned Aerial System) detection, tracking, classification and identification system for UTM (UAS Traffic Management) compliance verification and UAM (Urban Air Mobility). This system primarily uses passive optical and acoustic sensors along with GNSS (Global Navigation Satellite Systems), or GPS (Global Positioning System) and ADS-B (Automatic Dependent Surveillance Broadcast). The system design, known as Drone Net, is a network of passive sensors designed to cover a kilometer square area. In this paper we present the results of experiments to add an active RADAR (Radio Detection and Ranging) on the ground and active LIDAR (Light Detection and Ranging) on flight nodes (small UAS). System tests completed previously have shown feasibility for all passive optical and acoustic UTM and UAM. The point of the RADAR testing is to directly compare passive sensor networks to active to determine the value of each alone and to test the hypothesis that multimodal active and passive sensing will be superior, but likely at higher cost than passive alone. Previously, we completed coordinated experiments with an EO/IR camera system and acoustic sensor network with an Allsky hemispherical six-camera system with resolution up to 12 million pixels to optimize detection and tracking. For some applications such as corporate campuses and Class-D airports, passive sensing alone might be sufficient and most cost effective, but for urban, military, and higher traffic Class-C and Class-B larger airports, we believe the combined multi-modal purpose-built sUAS RADAR integrated with optical and acoustic sensor networks will be most effective. Based upon our preliminary results presented herein, purpose built small RADAR with wide fields of view configured into an All-sky active system along with optical All-sky cameras and acoustic sensors are ideal for urban locations requiring the highest confidence in monitoring of combined UTM, UAM and GA (General Aviation) traffic. UTM will mostly be small UAS delivering parcels and must share airspace with UAM carrying passengers for short-hop transportation along with general aviation covering longer distances, but also entering urban airspace at airports. Clearly the airspace in urban locations is going to become much more congested, with new risk, but also new opportunity to improve transportation overall. The results we present here are a start at answering basic questions about multi-modal sensor effectiveness for urban navigation, both passive and active. In scenarios where sUAS and UAM may not have reliable GNSS or might not be UTM compliant, the ground detection, tracking and localization is most critical for assured urban airspace safety and security.
{"title":"Correction: Comparison of RADAR, Passive Optical with Acoustic, and Fused Multi-Modal Active and Passive Sensing for UAS Traffic Management Compliance and Urban Air Mobility Safety","authors":"Sam Siewert, M. Andalibi, S. Bruder, Jonathan M. Buchholz, Doug Chamberlain, Alexandra L. Lindsey, Trevis Shiroma, David Stockhouse","doi":"10.2514/6.2020-1456.c1","DOIUrl":"https://doi.org/10.2514/6.2020-1456.c1","url":null,"abstract":"Embry Riddle Aeronautical University Prescott has designed and prototyped a small UAS (Unmanned Aerial System) detection, tracking, classification and identification system for UTM (UAS Traffic Management) compliance verification and UAM (Urban Air Mobility). This system primarily uses passive optical and acoustic sensors along with GNSS (Global Navigation Satellite Systems), or GPS (Global Positioning System) and ADS-B (Automatic Dependent Surveillance Broadcast). The system design, known as Drone Net, is a network of passive sensors designed to cover a kilometer square area. In this paper we present the results of experiments to add an active RADAR (Radio Detection and Ranging) on the ground and active LIDAR (Light Detection and Ranging) on flight nodes (small UAS). System tests completed previously have shown feasibility for all passive optical and acoustic UTM and UAM. The point of the RADAR testing is to directly compare passive sensor networks to active to determine the value of each alone and to test the hypothesis that multimodal active and passive sensing will be superior, but likely at higher cost than passive alone. Previously, we completed coordinated experiments with an EO/IR camera system and acoustic sensor network with an Allsky hemispherical six-camera system with resolution up to 12 million pixels to optimize detection and tracking. For some applications such as corporate campuses and Class-D airports, passive sensing alone might be sufficient and most cost effective, but for urban, military, and higher traffic Class-C and Class-B larger airports, we believe the combined multi-modal purpose-built sUAS RADAR integrated with optical and acoustic sensor networks will be most effective. Based upon our preliminary results presented herein, purpose built small RADAR with wide fields of view configured into an All-sky active system along with optical All-sky cameras and acoustic sensors are ideal for urban locations requiring the highest confidence in monitoring of combined UTM, UAM and GA (General Aviation) traffic. UTM will mostly be small UAS delivering parcels and must share airspace with UAM carrying passengers for short-hop transportation along with general aviation covering longer distances, but also entering urban airspace at airports. Clearly the airspace in urban locations is going to become much more congested, with new risk, but also new opportunity to improve transportation overall. The results we present here are a start at answering basic questions about multi-modal sensor effectiveness for urban navigation, both passive and active. In scenarios where sUAS and UAM may not have reliable GNSS or might not be UTM compliant, the ground detection, tracking and localization is most critical for assured urban airspace safety and security.","PeriodicalId":93413,"journal":{"name":"Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85580104","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":"Molecular recombination pathways of oxygen from quasiclassical trajectory calculations of the O3system","authors":"Chaithanya Kondur, K. Stephani","doi":"10.2514/6.2020-1939","DOIUrl":"https://doi.org/10.2514/6.2020-1939","url":null,"abstract":"","PeriodicalId":93413,"journal":{"name":"Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)","volume":"66 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73154441","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":"Lagrangian Coherent Structures in Optimal Vortex Ring Formation","authors":"B. Harter, J. Gregory","doi":"10.2514/6.2020-0141","DOIUrl":"https://doi.org/10.2514/6.2020-0141","url":null,"abstract":"","PeriodicalId":93413,"journal":{"name":"Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84249551","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}
Masahide Kuwata, Sho Yokota, H. Sawada, Yoshiaki Abe, A. Yakeno, T. Nonomura, K. Asai, S. Obayashi
{"title":"Correction: Drag Coefficients of Circular Cylinders with Fineness Ratios of less than 0.50 measured by 0.1 and 0.3 m Magnetic Suspension and Balance Systems","authors":"Masahide Kuwata, Sho Yokota, H. Sawada, Yoshiaki Abe, A. Yakeno, T. Nonomura, K. Asai, S. Obayashi","doi":"10.2514/6.2020-1325.c1","DOIUrl":"https://doi.org/10.2514/6.2020-1325.c1","url":null,"abstract":"","PeriodicalId":93413,"journal":{"name":"Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89336037","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":"Surface pressure and coherent structure evolution on an axially accelerated delta wing","authors":"Han Tu, M. Marzanek, Melissa A. Green, D. Rival","doi":"10.2514/6.2020-2043","DOIUrl":"https://doi.org/10.2514/6.2020-2043","url":null,"abstract":"","PeriodicalId":93413,"journal":{"name":"Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74310149","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":"Applications of Polynomial Chaos-Based Cokriging to Aerodynamic Design Optimization Benchmark Problems","authors":"J. Nagawkar, Leifur Þ. Leifsson, Xiaosong Du","doi":"10.2514/6.2020-0542","DOIUrl":"https://doi.org/10.2514/6.2020-0542","url":null,"abstract":"","PeriodicalId":93413,"journal":{"name":"Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89098964","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}
C. Garbacz, M. Fossati, W. Maier, J. Alonso, J. Scoggins, T. Magin, T. Economon
{"title":"Correction: Numerical Study of Shock Interference Patterns for Gas Flows with Thermal Nonequilibrium and Finite-Rate Chemistry","authors":"C. Garbacz, M. Fossati, W. Maier, J. Alonso, J. Scoggins, T. Magin, T. Economon","doi":"10.2514/6.2020-1805.c1","DOIUrl":"https://doi.org/10.2514/6.2020-1805.c1","url":null,"abstract":"","PeriodicalId":93413,"journal":{"name":"Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79041661","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}
Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)
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