AIAA Aviation 2019 Forum最新文献

Model Development for a Comparison of VTOL and STOL Electric Aircraft Using Geometric Programming 用几何规划建立垂直起降与垂直起降电动飞机模型

AIAA Aviation 2019 Forum Pub Date : 2019-09-04 DOI: 10.2514/6.2019-3477

C. Courtin, R. Hansman

引用次数: 5

Multi-fidelity efficient global optimization: Methodology and application to airfoil shape design 多保真度高效全局优化:翼型外形设计的方法与应用

AIAA Aviation 2019 Forum Pub Date : 2019-06-21 DOI: 10.2514/6.2019-3236

M. Meliani, N. Bartoli, T. Lefebvre, M. Bouhlel, J. Martins, J. Morlier

引用次数: 22

Weak Non-Parallel Effects on Chemically Reacting Hypersonic Boundary Layer Stability 化学反应高超声速边界层稳定性的弱非平行效应

AIAA Aviation 2019 Forum Pub Date : 2019-06-21 DOI: 10.2514/6.2019-2853

L. Zanus, F. M. Miró, F. Pinna

{"title":"Weak Non-Parallel Effects on Chemically Reacting Hypersonic Boundary Layer Stability","authors":"L. Zanus, F. M. Miró, F. Pinna","doi":"10.2514/6.2019-2853","DOIUrl":"https://doi.org/10.2514/6.2019-2853","url":null,"abstract":"Advancing towards the correct modeling and subsequent understanding of laminar-toturbulent transition during atmospheric reentry is paramount for the future of aerospace technology. The coexistence of multiple physical phenomena and the grand amount of conditioning factors require the progressive extension of the applicability capabilities of the theoretical models. Past efforts have been mostly dedicated to investigate high-temperature and non-equilibrium effects using parallel stability theories. However, the implications of coupling these thermochemical phenomena with non-parallelism remains uncertain. Advanced state of the art thermodynamic and transport models are employed both in parallel and weakly non-parallel stability theories (LST and LPSE). A parametric study about the influence of nonlocal effects under different re-entry conditions and flow assumptions (i.e. CPG, TPG, CNE and LTE) showed that non-parallel effects stabilize/destabilize the boundary-layer, depending on the altitude and independently from the gas model employed. Particularly, they lead to a stronger destabilization of the 2nd Mackmode at the earliest points of the atmospheric re-entry flight envelope, reducing their effect until being weakly stabilizing at the lowest altitudes. Drastic N factor increments occurred assuming LTE, due to the presence of unstable supersonic modes, promoted by the boundary-layer cooling, caused by the intense chemical activity.","PeriodicalId":384114,"journal":{"name":"AIAA Aviation 2019 Forum","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116040619","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

Jacobian-free implicit p-adaptive high-order compact direct flux reconstruction methods for unsteady flow simulation 非定常流动模拟的无雅可比隐式p自适应高阶紧致直接通量重建方法

AIAA Aviation 2019 Forum Pub Date : 2019-06-17 DOI: 10.2514/6.2019-3062

Lai Wang, Meilin Yu

引用次数: 4

Correction: Hypersonic wake measurements behind a slender cone using FLEET velocimetry 修正:使用FLEET测速仪测量细长锥体后面的高超声速尾迹

AIAA Aviation 2019 Forum Pub Date : 2019-06-17 DOI: 10.2514/6.2019-3381.C1

Yibin Zhang, Daniel R. Richardson, S. Beresh, Katya M. Casper, M. Soehnel, J. Henfling, R. Spillers

引用次数: 0

Global instability analysis of a boundary layer flow over a small cavity 小空腔上边界层流动的全局不稳定性分析

AIAA Aviation 2019 Forum Pub Date : 2019-06-17 DOI: 10.2514/6.2019-3535

M. Mathias, M. Medeiros

引用次数: 3

Textile Strain Measurement System 纺织品应变测量系统

AIAA Aviation 2019 Forum Pub Date : 2019-06-17 DOI: 10.2514/6.2019-3146

A. Witkowski, A. Levay, M. Murbach

引用次数: 1

Nonlinear Görtler Vortices and Their Secondary Instability in a Hypersonic Boundary Layer 高超声速边界层中的非线性Görtler涡旋及其二次不稳定性

AIAA Aviation 2019 Forum Pub Date : 2019-06-17 DOI: 10.2514/6.2019-3216

Fei Li, Meelan Choudhari, P. Paredes

{"title":"Nonlinear Görtler Vortices and Their Secondary Instability in a Hypersonic Boundary Layer","authors":"Fei Li, Meelan Choudhari, P. Paredes","doi":"10.2514/6.2019-3216","DOIUrl":"https://doi.org/10.2514/6.2019-3216","url":null,"abstract":"Nonlinear development of the Görtler instability over a concave surface gives rise to a highly distorted inflectional flow field in the boundary layer that leads to both wall-normal and spanwise gradients in the flow. Such nonlinear structures are susceptible to strong, high-frequency secondary instabilities that may lead to the onset of laminar-turbulent transition. The present numerical study uses direct numerical simulations and linear secondary instability theory to investigate finite amplitude Görtler vortices and their secondary instability characteristics, respectively, in the hypersonic flow over an axisymmetric cone with a concave aft body. To complement previous studies in the literature wherein the Görtler instability was usually studied for a flat plate and initiated at some upstream location by imposing an eigenfunction as the inflow condition or by blowing and suction at the wall, the present investigation is focused on fully realizable Görtler instability that is excited by an azimuthally periodic array of surface protuberances. Furthermore, while the previous work had mostly focused on the secondary instability of Görtler vortices with cross-plane velocity contours that resembled bell-shaped structures, the present results confirm that fully developed mushroom structures also exist in the hypersonic regime when the Görtler vortex amplitude is sufficiently large. Computations further reveal that the dominant modes of secondary instability in these mushroom-shaped structures correspond to an antisymmetic (i.e., sinuous) “stem” mode that concentrates within the strong, nearly wall-normal internal shear layers surrounding the stem regions underneath the caps of the mushroom structures. Additionally, there exist a multitude of other significantly unstable secondary instability modes of both symmetric and antisymmetric types. Analogous to the secondary instability of crossflow vortices in hypersonic flows, secondary instability modes originating from the Mack mode instability play an important role during the nonlinear breakdown process.","PeriodicalId":384114,"journal":{"name":"AIAA Aviation 2019 Forum","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116967277","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

Correction: Implicit Large Eddy Simulation of Low Pressure Turbine Airfoils Using a High Order Navier-Stokes Solver 修正:使用高阶Navier-Stokes求解器的低压涡轮翼型的隐式大涡模拟

AIAA Aviation 2019 Forum Pub Date : 2019-06-17 DOI: 10.2514/6.2019-2840.C1

M. Bolinches-Gisbert, R. Corral, F. Gisbert, A. Sotillo

引用次数: 0

F-35 High Angle of Attack Flight Control Development and Flight Test Results F-35大迎角飞行控制研制及飞行试验结果

AIAA Aviation 2019 Forum Pub Date : 2019-06-17 DOI: 10.2514/6.2019-3227

Dan Canin

引用次数: 3