2018 Atmospheric and Space Environments Conference最新文献_第7页

Experimental Studies of Ice Crystal Accretion on an Axisymmetric Body at Engine-Realistic Conditions 轴对称体上冰晶吸积的实验研究

2018 Atmospheric and Space Environments Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-4223

Alexander Bucknell, M. McGilvray, D. Gillespie, Geoffrey Jones, Alasdair Reed, Benjamin Collier

{"title":"Experimental Studies of Ice Crystal Accretion on an Axisymmetric Body at Engine-Realistic Conditions","authors":"Alexander Bucknell, M. McGilvray, D. Gillespie, Geoffrey Jones, Alasdair Reed, Benjamin Collier","doi":"10.2514/6.2018-4223","DOIUrl":"https://doi.org/10.2514/6.2018-4223","url":null,"abstract":"It has been recognised in recent years that high altitude atmospheric ice crystals pose a threat to aircraft engines in flight. Instances of damage, surge and shutdown have been recorded at altitudes significantly greater than those associated with supercooled water icing. It is believed that ice particles can accrete inside the core compressor, although the exact mechanism by which this occurs remains poorly understood. In order to model ice crystal accretion, an estimate of the proportion of the impinging ice and water that sticks to a surface (the ‘sticking efficiency’) is required. This is believed to be dependent upon a number of parameters including particle melt ratio and diameter, and surface condition (rough or smooth, dry or wetted, warm or cold). This paper presents data from experiments undertaken in the National Research Council of Canada’s (NRC) Research Altitude Test Facility (RATFac). An axisymmetric test article, which featured three interchangeable cone ‘noses’ of varying half-angle, was used over a period of two weeks. A 35° half-angle nose was used for a parametric study of Mach number, Total Water Content (TWC), wet bulb temperature and particle size distribution (PSD). At selected test conditions, 20° and 45° half-angle noses were also tested. An assessment of the response of the Science Engineering Associates WCM-2000 multiwire probe in glaciated condition is presented, as a function of TWC, particle size and Mach number. A shadowgraphy technique was used to measure the ice accretion growth rate on the nose, with isometric camera views for qualitative assessments of spatial uniformity and build/shed events. The results show that sticking efficiency has a strong dependency on particle melt ratio, with maximum values attained when melt is typically between 9-13%. Erosion is shown to be correlated with particle size, Mach number and surface angle. New semi-empirical models are presented for sticking probability and erosion.","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"45 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":"128738741","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

Rotor Ice Shedding and Trajectory Analyses in Forward Flight 前飞旋翼消冰及轨迹分析

2018 Atmospheric and Space Environments Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3659

M. J. Anthony, M. Nathoo, Zhao Zhan, W. Habashi, M. Fossati

引用次数: 2

Characterization of an Engine Icing Tunnel and Comparison to Liquid Water Content from an Evaporation Model 发动机结冰隧道的表征及蒸发模型与液态水含量的比较

2018 Atmospheric and Space Environments Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3972

C. Davison, J. Macleod

引用次数: 0

A Class of Finite-Volume Models for Atmospheric Flows Across Scales 一类跨尺度大气流动的有限体积模型

2018 Atmospheric and Space Environments Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3497

J. Szmelter, M. Gillard, P. Smolarkiewicz, C. Kühnlein

{"title":"A Class of Finite-Volume Models for Atmospheric Flows Across Scales","authors":"J. Szmelter, M. Gillard, P. Smolarkiewicz, C. Kühnlein","doi":"10.2514/6.2018-3497","DOIUrl":"https://doi.org/10.2514/6.2018-3497","url":null,"abstract":"The paper examines recent advancements in the class of Nonoscillatory Forward-in-Time (NFT) schemes that exploit the implicit LES (ILES) properties of Multidimensional Positive\u0000Definite Advection Transport Algorithm (MPDATA). The reported developments address both global and limited area models spanning a range of atmospheric flows, from the hydrostatic regime at planetary scale, down to mesoscale and microscale where flows are inherently nonhydrostatic. All models operate on fully unstructured (and hybrid) meshes and utilize a median dual mesh finite volume discretisation. High performance computations for global flows employ a bespoke hybrid MPI-OpenMP approach and utilise the ATLAS library. Simulations across scales—from a global baroclinic instability epitomising evolution of weather systems down to stratified orographic flows rich in turbulent phenomena due to gravity-wave breaking in\u0000dispersive media, verify the computational advancements and demonstrate the efficacy of\u0000ILES both in regularizing large scale flows at the scale of the mesh resolution and taking a role of a subgrid-scale turbulence model in simulation of turbulent flows in the LES regime.","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"207 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":"128207812","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

Latent Heat and Liquid Water Content (LWC) Sensor based on Transient Heat Flux Measurements 基于瞬态热通量测量的潜热和液态水含量传感器

2018 Atmospheric and Space Environments Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3831

Yiqiang Han, J. Palacios

引用次数: 3

Initial Development of a Model to Predict Impact Ice Adhesion Stress 预测冲击冰附着应力模型的初步发展

2018 Atmospheric and Space Environments Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3344

D. Thompson, D. Meng, A. Afshar, Randa Bassou, Jing Zong, E. Bonaccurso, A. Laroche, Vittorio Vercillo

引用次数: 9

Convection from Surfaces with Ice Roughness Characterized at Increasing Accumulation Times 以累积次数增加为特征的冰粗糙度表面对流

2018 Atmospheric and Space Environments Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3016

Jaime L. McCarrell, T. Shannon, S. McClain

引用次数: 2

Fracture Mechanics Based Approach for Ice Adhesion Characterization 基于断裂力学的冰黏附表征方法

2018 Atmospheric and Space Environments Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3343

Dawood t. Bishoy, C. Giuffre, A. Bastawros

引用次数: 5

Design of an Icing Wind Tunnel Contraction for Supercooled Large Drop Conditions 过冷大落差结冰风洞收缩设计

2018 Atmospheric and Space Environments Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-3185

D. Orchard, K. Szilder, C. Davison

引用次数: 6

Hybrid numerical simulation of the jet-wake-vortex interaction of a cruising aircraft 巡航飞机射流尾流-旋涡相互作用的混合数值模拟

2018 Atmospheric and Space Environments Conference Pub Date : 2018-06-24 DOI: 10.2514/6.2018-2865

A. Stephan, David Rohlmann, F. Holzäpfel, R. Rudnik

引用次数: 0