AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.)最新文献

Aeroelastic Scaling for Flexible High Aspect Ratio Wings 柔性高展弦比机翼的气动弹性缩放

AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.) Pub Date : 2019-12-31 DOI: 10.2514/6.2019-1594

Sezsy Yusuf, Alessandro Pontillo, S. Weber, D. Hayes, Mohammad M. Lone

{"title":"Aeroelastic Scaling for Flexible High Aspect Ratio Wings","authors":"Sezsy Yusuf, Alessandro Pontillo, S. Weber, D. Hayes, Mohammad M. Lone","doi":"10.2514/6.2019-1594","DOIUrl":"https://doi.org/10.2514/6.2019-1594","url":null,"abstract":"This paper provides an overview of the work conducted as part of the Cranfield BEAm Reduction and Dynamic Scaling (BeaRDS ) programme, which aims to develop a methodology for designing, manufacturing and testing of a dynamically scaled High Aspect Ratio (HAR) Wing inside Cranfield 8’x6’ wind tunnel. The aim of this paper is to develop a methodology that adopts scaling laws to allow experimental testing of a conceptual flexible-wing planform as part of the design process. Based on the Buckingham π theorem, a set of scaling laws are determined that enable the relationship between a full-scale and sub-scale model. The dynamically sub-scaled model is manufactured as a combination of spar, skin, and added mass representing the stiffness, aerodynamic profile, and aeroelastic behaviour respectively. The spar was manufactured as a cross-sectional shape using Aluminium material, while the skin was manufactured using PolyJet technology. Compromises due to the manufacturing process are outlined and lessons learned during the development of the sub-scaled model are highlighted.","PeriodicalId":93407,"journal":{"name":"AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.)","volume":"202 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80232952","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: 7

Investigation of the Exhaust Flow of a Pulse Detonation Combustor at different Operating Conditions based on High-Speed Schlieren and PIV 基于高速纹影和PIV的脉冲爆轰燃烧室不同工况下排气流量研究

AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.) Pub Date : 2019-10-22 DOI: 10.2514/6.2019-1512

M. Haghdoost, Daniel Edgington-Mitchel, C. Paschereit, K. Oberleithner

{"title":"Investigation of the Exhaust Flow of a Pulse Detonation Combustor at different Operating Conditions based on High-Speed Schlieren and PIV","authors":"M. Haghdoost, Daniel Edgington-Mitchel, C. Paschereit, K. Oberleithner","doi":"10.2514/6.2019-1512","DOIUrl":"https://doi.org/10.2514/6.2019-1512","url":null,"abstract":"The exhaust flow of a Pulse Detonation Combustor (PDC) is investigated for different operating conditions. The PDC consists of two units, the deflagration to detonation transition section and the exhaust tube with a straight nozzle. High-speed high-resolution schlieren images visualize the shock dynamics downstream of the nozzle. The flow dynamics during one full PDC cycle is examined via high-speed Particle Image Velocimetry. A well-suited solid tracer particle for supersonic reactive flow is determined in a preliminary study to minimize the PIV measurement error. The investigated operating conditions of the PDC differ in fill-fraction, which is the percentage of the tube filled with a reactive mixture. With increasing fill-fraction, the flow features grow in size and strength, as the propagation velocity of the leading shock increases. The blow down process of the PDC is characterized by several exhaust and suction phases. An increase in fill-fraction results in a stronger first exhaust phase, while the subsequent suction and exhaust phases remain almost unaffected.","PeriodicalId":93407,"journal":{"name":"AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.)","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85879338","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: 5

An Efficient CFD Approach for Co-Axial Rotor Simulations 同轴转子仿真的一种高效CFD方法

AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.) Pub Date : 2019-04-01 DOI: 10.2514/6.2019-1658

Jason K. Cornelius, M. Kinzel, S. Schmitz

{"title":"An Efficient CFD Approach for Co-Axial Rotor Simulations","authors":"Jason K. Cornelius, M. Kinzel, S. Schmitz","doi":"10.2514/6.2019-1658","DOIUrl":"https://doi.org/10.2514/6.2019-1658","url":null,"abstract":"The advent of small-scale multicopter aircraft including quadand octocopter configurations has opened the door to cost-effective vertical flight technology. These aircraft are intended to be used in applications such as public transportation, recreational products, commercial tools, military technologies, and even extra-terrestrial planetary exploration. As the demand for these aircraft continues to rise, analysis capabilities for their design and performance prediction become increasingly useful. The complex problem involving rotor-rotor interactions calls for highfidelity prediction tools, but conventional approaches with these tools have immense computational demand. In this work, a computational fluid dynamics model is developed to analyze a co-axial configuration and is compared to conventional results. The methodology, benchmarking process, and preliminary results indicate that the modeling approach, which reduces the computational cost by more than two orders-of-magnitude over the conventional solution method, has potential for future analyses to support design.","PeriodicalId":93407,"journal":{"name":"AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.)","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88514417","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

Quasi-static experimental path-following 准静态实验路径跟踪

AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.) Pub Date : 2019-03-08 DOI: 10.2514/6.2019-0230

R. Neville, R. Groh, A. Pirrera, M. Schenk

引用次数: 2

Scaling Bioinspired Mars Flight Vehicles for Hover. 缩放生物启发的火星飞行器悬停。

AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.) Pub Date : 2019-01-11 Epub Date: 2019-01-06 DOI: 10.2514/6.2019-0567

Jeremy A Pohly, Chang-Kwon Kang, Madhu K Sridhar, D Brian Landrum, Farbod Fahimi, Bryan Mesmer, James E Bluman, Hikaru Aono, Taeyoung Lee

{"title":"Scaling Bioinspired Mars Flight Vehicles for Hover.","authors":"Jeremy A Pohly, Chang-Kwon Kang, Madhu K Sridhar, D Brian Landrum, Farbod Fahimi, Bryan Mesmer, James E Bluman, Hikaru Aono, Taeyoung Lee","doi":"10.2514/6.2019-0567","DOIUrl":"https://doi.org/10.2514/6.2019-0567","url":null,"abstract":"With the resurgent interest in landing humans on Mars, it is critical that our understanding of the Martian environment is complete and accurate. One way to improve our model of the red planet is through aerial surveillance, which provides information that augments the observations made by ground-based exploration and satellite imagery. Although the ultra-low-density Mars environment has previously stymied designs for achieving flight on Mars, bioinspired solutions for flapping wing flight can utilize the same high lift producing mechanisms employed by insects on Earth. Motivated by the current technologies for terrestrial flapping wing aerial vehicles on Earth, we seek solutions for a 5 gram bioinspired flapping wing aerial vehicle for flight on Mars. A zeroth-order method is proposed to determine approximate wing and kinematic values that generate bioinspired hover solutions. We demonstrate that a family of solutions exists for designs that are O(101) g, which are verified using a 3D Navier-Stokes solver. Our results show that unsteady lift enhancement mechanisms, such as delayed stall and rotational lift, are present in the bioinspired solution for a 5 g flapping wing vehicle hovering in Mars conditions, verifying that the zeroth-order method is a useful design tool. As a result, it is possible to design a family of bioinspired flapping wing robots for Mars by augmenting the adverse effects of the ultra-low density with large wings that exploit the advantages of unsteady lift enhancement mechanisms used by insects on Earth.","PeriodicalId":93407,"journal":{"name":"AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.)","volume":"2019 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2514/6.2019-0567","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39944208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Correction: Development of Vertiport Capacity Envelopes and Analysis of Their Sensitivity to Topological and Operational Factors 更正:垂直机场容量包络的发展及其对拓扑和操作因素的敏感性分析

AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.) Pub Date : 2019-01-08 DOI: 10.2514/6.2019-0526.C1

Parker D. Vascik, R. Hansman

引用次数: 4

Reinforced Learning to Cross-Country Soar in the Vertical Plane of Motion 垂直运动平面越野翱翔强化学习

AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.) Pub Date : 2019-01-07 DOI: 10.2514/6.2019-1420

S. Notter, M. Zürn, Pascal Groß, W. Fichter

引用次数: 7

Mixing in Linear Detonation Channel with Discrete Injectors and Side Relief 带分离喷油器和侧泄压的线性爆轰通道混合

AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.) Pub Date : 2019-01-07 DOI: 10.2514/6.2019-1014

J. Burr, K. Yu

引用次数: 11

Hybrid LES/RANS Simulation of a Premixed Ethylene-fueled Dual-mode Scramjet Combustor: Small Cavity Configuration 预混合乙烯燃料双模超燃冲压发动机燃烧室的混合LES/RANS仿真:小腔结构

AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.) Pub Date : 2019-01-07 DOI: 10.2514/6.2019-1445

T. Nielsen, J. Edwards, H. Chelliah, D. Lieber, Clayton M. Geipel, C. Goyne, R. Rockwell, A. Cutler

引用次数: 5

Reusing Information for Multifidelity Active Learning in Reliability-Based Design Optimization 基于可靠性的设计优化中多保真主动学习的信息重用

AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.) Pub Date : 2019-01-07 DOI: 10.2514/6.2019-1222

A. Chaudhuri, A. Marques, Rémi R. Lam, K. Willcox

{"title":"Reusing Information for Multifidelity Active Learning in Reliability-Based Design Optimization","authors":"A. Chaudhuri, A. Marques, Rémi R. Lam, K. Willcox","doi":"10.2514/6.2019-1222","DOIUrl":"https://doi.org/10.2514/6.2019-1222","url":null,"abstract":"This paper develops a multifidelity method to reuse information from optimization history for adaptively refining surrogates in reliability-based design optimization (RBDO). RBDO can be computationally prohibitive due to numerous evaluations of the expensive high-fidelity models to estimate the probability of failure of the system in each optimization iteration. In this work, the high-fidelity model evaluations are replaced by cheaper-to-evaluate adaptively refined surrogate evaluations in the probability of failure estimation. The method reuses the past optimization iterations as an information source for devising an efficient multifidelity active learning (adaptive sampling) algorithm to refine the surrogates that best locate the failure boundary. We implement the information-reuse method using a multifidelity extension of efficient global reliability analysis that combines the expected feasibility function with a weighted lookahead information gain criterion to pick both the next sample location and information source used to evaluate the sample.","PeriodicalId":93407,"journal":{"name":"AIAA Atmospheric Flight Mechanics Conference 2019 : papers presented at the AIAA SciTech Forum and Exposition 2019, San Diego, California, USA, 7-11 January 2019. AIAA SciTech Forum and Exposition (2019 : San Diego, Calif.)","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73810250","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: 12