Julien Lallement, P. Villedieu, P. Trontin, C. Laurent
The objective of this work is to model the motion and the instabilities of partially wetting thin liquid films to derive models for the formation of wet and dry surfaces. The main idea of the work consists in reformulating the shallow water equations by introducing a disjoining pressure to model the effects of a partial wetting. Emphasis is put on the numerical treatment of the capillary forces, especially those acting in the vicinity of the contact line, since they can strongly influence the development of instabilities. We use an extended system that consists in reducing the order of the shallow water system by adding one evolution equation. This model is suited for numerical purposes since the surface tension term only involves second order derivatives instead of third order derivatives in the classical shallow water systems with two equations. A conservative formulation of the system and the associated energy are derived. One-dimensional numerical simulations using a first order implicit finite volume scheme have been performed. Droplet’s stationnary shape, spreading length and time on an horizontal substrate is well recovered for all contact angle. Moreover, based on a linear stability analysis, unstable dewetting regimes of an infinite film of uniform thickness are identified and simulated.
{"title":"A shallow water type model to describe the dynamic of thin partially wetting films for the simulation of anti-icing systems","authors":"Julien Lallement, P. Villedieu, P. Trontin, C. Laurent","doi":"10.2514/6.2018-3012","DOIUrl":"https://doi.org/10.2514/6.2018-3012","url":null,"abstract":"The objective of this work is to model the motion and the instabilities of partially wetting thin liquid films to derive models for the formation of wet and dry surfaces. The main idea of the work consists in reformulating the shallow water equations by introducing a disjoining pressure to model the effects of a partial wetting. Emphasis is put on the numerical treatment of the capillary forces, especially those acting in the vicinity of the contact line, since they can strongly influence the development of instabilities. We use an extended system that consists in reducing the order of the shallow water system by adding one evolution equation. This model is suited for numerical purposes since the surface tension term only involves second order derivatives instead of third order derivatives in the classical shallow water systems with two equations. A conservative formulation of the system and the associated energy are derived. One-dimensional numerical simulations using a first order implicit finite volume scheme have been performed. Droplet’s stationnary shape, spreading length and time on an horizontal substrate is well recovered for all contact angle. Moreover, based on a linear stability analysis, unstable dewetting regimes of an infinite film of uniform thickness are identified and simulated.","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"461 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":"123243437","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":"An Experimental Study of the Dynamic Ice Accreting Process over a Rotating Aero-engine Fan Model","authors":"Linkai Li, Yang Liu, Hui Hu","doi":"10.2514/6.2018-3013","DOIUrl":"https://doi.org/10.2514/6.2018-3013","url":null,"abstract":"","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"21 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":"123908453","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":"Examination of the Applicability of NOAA MADIS Aircraft Based Observation Dataset for Wake Turbulence Research","authors":"S. Mackey, B. Robins, Frank Wang, Yan Zhang","doi":"10.2514/6.2018-2866","DOIUrl":"https://doi.org/10.2514/6.2018-2866","url":null,"abstract":"","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"10 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":"130092359","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}
Wesley C. Patterson, Yusaku Nishio, Joseph Gonzales, Adam J. Mallette, Y. Hirai, H. Sakaue
{"title":"Surface Temperature Mapping Using Luminescent Imaging for Super-Cooled Large Droplet Icing","authors":"Wesley C. Patterson, Yusaku Nishio, Joseph Gonzales, Adam J. Mallette, Y. Hirai, H. Sakaue","doi":"10.2514/6.2018-3186","DOIUrl":"https://doi.org/10.2514/6.2018-3186","url":null,"abstract":"","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"54 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":"125462554","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}
Christopher D. Faulkner, Brandon Herrera, B. R. Jean, S. McClain
{"title":"Improved Electromagnetic Sensor for Detection of Ice Accretion inside Turbofan Engine Axial Compressor Stages","authors":"Christopher D. Faulkner, Brandon Herrera, B. R. Jean, S. McClain","doi":"10.2514/6.2018-4226","DOIUrl":"https://doi.org/10.2514/6.2018-4226","url":null,"abstract":"","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments 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":"124049479","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. Struk, M. King, Tadas P. Bartkus, J. Tsao, D. Fuleki, M. Neuteboom, Jennifer L. Chalmers
This paper presents results from a study of the fundamental physics of ice-crystal ice accretion using a NACA 0012 airfoil at the National Research Council of Canada (NRC) Research Altitude Test Facility in August 2017. These tests were a continuation of work which began in 2010 as part of a joint collaboration between NASA and NRC. The research seeks to generate icing conditions representative of those that occur inside a jet engine when ingesting ice crystals. In this test, an airfoil was exposed to mixed-phase icing conditions and the resulting ice accretions were recorded and analyzed. This paper details the specific objectives, procedures, and measurements which included the aero-thermal and cloud measurements. The objectives were built upon observations and hypothesis generated from several previous test campaigns regarding mixed-phase ice-crystal icing. The specific objectives included (A) ice accretions under different wet-bulb temperatures, (B) investigations of steady-state ice shapes previously reported in the literature, (C) total water content variations in search of a threshold for accretion, and (D) probe characterization related to measuring melt fraction which is important to characterize the mixed-phase condition. The resulting ice accretions and conditions leading to such accretions are intended to help extend NASA’s predictive ice-accretion codes to include conditions occurring in engine ice-crystal icing. National Aeronautics and Space Administration (NASA) and the National Research Council (NRC) of Canada. The investigations focus on the fundamental physics associated with ice accretion. This investigation examines ice accretions on an airfoil test article exposed to ice-crystal and mixed phase conditions similar to those believed to exist in core compressor regions of jet engines. The conditions were generated using the NRC’s Research Altitude Test Facility (RATFac) which can introduce ice particles (and/or supplemental liquid water droplets) into an airflow in warmer than freezing conditions and various pressures. The partially melted ice particles and supplemental liquid water, if used, produce a mixed-phase condition which impinges on the airfoil test article. Under certain aero-thermal conditions and melt ratios The test section is a plane just upstream of the airfoil leading edge. The aero-thermal conditions are the total pressure ( P 0 ), total temperature ( T 0 ), Mach number, and humidity using the mass mixing ratio which is also referred to as the specific humidity ( SH ). The wet bulb temperature is adjusted by varying the humidity of the flowing air for a fixed T 0 and P 0 . Lower humidity results in lower wet-bulb temperatures but also more evaporation. The target conditions referred to “cloud-off” conditions, and use the subscript ‘ off ’, since these do not account for changes due to thermal interaction with the cloud. During cloud-on testing, the changes in aerothermal conditions, specifically temperature and
{"title":"Ice Crystal Icing Physics Study using a NACA 0012 Airfoil at the National Research Council of Canada’s Research Altitude Test Facility","authors":"P. Struk, M. King, Tadas P. Bartkus, J. Tsao, D. Fuleki, M. Neuteboom, Jennifer L. Chalmers","doi":"10.2514/6.2018-4224","DOIUrl":"https://doi.org/10.2514/6.2018-4224","url":null,"abstract":"This paper presents results from a study of the fundamental physics of ice-crystal ice accretion using a NACA 0012 airfoil at the National Research Council of Canada (NRC) Research Altitude Test Facility in August 2017. These tests were a continuation of work which began in 2010 as part of a joint collaboration between NASA and NRC. The research seeks to generate icing conditions representative of those that occur inside a jet engine when ingesting ice crystals. In this test, an airfoil was exposed to mixed-phase icing conditions and the resulting ice accretions were recorded and analyzed. This paper details the specific objectives, procedures, and measurements which included the aero-thermal and cloud measurements. The objectives were built upon observations and hypothesis generated from several previous test campaigns regarding mixed-phase ice-crystal icing. The specific objectives included (A) ice accretions under different wet-bulb temperatures, (B) investigations of steady-state ice shapes previously reported in the literature, (C) total water content variations in search of a threshold for accretion, and (D) probe characterization related to measuring melt fraction which is important to characterize the mixed-phase condition. The resulting ice accretions and conditions leading to such accretions are intended to help extend NASA’s predictive ice-accretion codes to include conditions occurring in engine ice-crystal icing. National Aeronautics and Space Administration (NASA) and the National Research Council (NRC) of Canada. The investigations focus on the fundamental physics associated with ice accretion. This investigation examines ice accretions on an airfoil test article exposed to ice-crystal and mixed phase conditions similar to those believed to exist in core compressor regions of jet engines. The conditions were generated using the NRC’s Research Altitude Test Facility (RATFac) which can introduce ice particles (and/or supplemental liquid water droplets) into an airflow in warmer than freezing conditions and various pressures. The partially melted ice particles and supplemental liquid water, if used, produce a mixed-phase condition which impinges on the airfoil test article. Under certain aero-thermal conditions and melt ratios The test section is a plane just upstream of the airfoil leading edge. The aero-thermal conditions are the total pressure ( P 0 ), total temperature ( T 0 ), Mach number, and humidity using the mass mixing ratio which is also referred to as the specific humidity ( SH ). The wet bulb temperature is adjusted by varying the humidity of the flowing air for a fixed T 0 and P 0 . Lower humidity results in lower wet-bulb temperatures but also more evaporation. The target conditions referred to “cloud-off” conditions, and use the subscript ‘ off ’, since these do not account for changes due to thermal interaction with the cloud. During cloud-on testing, the changes in aerothermal conditions, specifically temperature and","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"2 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":"124094518","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":"Contrail Flight Data for a Variety of Jet Fuels","authors":"Anthony P. Brown","doi":"10.2514/6.2018-3188","DOIUrl":"https://doi.org/10.2514/6.2018-3188","url":null,"abstract":"","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"21 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":"121506030","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}
T. Misaka, Ryoichi Yoshimura, S. Obayashi, N. Matayoshi
{"title":"Large Eddy Simulation of Wake Vortices under Influences of Hangar Wake and the Ground","authors":"T. Misaka, Ryoichi Yoshimura, S. Obayashi, N. Matayoshi","doi":"10.2514/6.2018-2864","DOIUrl":"https://doi.org/10.2514/6.2018-2864","url":null,"abstract":"","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"75 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":"117219411","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}
G. Linassier, M. Balland, Hugo Pervier, M. Pervier, D. Hammond, E. Radenac
In the framework of STORM
在STORM的框架中
{"title":"Experimental characterization of anti-icing system and accretion of re-emitted droplets on turbojet engine blades","authors":"G. Linassier, M. Balland, Hugo Pervier, M. Pervier, D. Hammond, E. Radenac","doi":"10.2514/6.2018-3657","DOIUrl":"https://doi.org/10.2514/6.2018-3657","url":null,"abstract":"In the framework of STORM","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"28 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":"131918627","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":"Flight Measurement of Medium Category Wake Vortex Characteristics","authors":"Anthony P. Brown","doi":"10.2514/6.2018-2867","DOIUrl":"https://doi.org/10.2514/6.2018-2867","url":null,"abstract":"","PeriodicalId":419456,"journal":{"name":"2018 Atmospheric and Space Environments Conference","volume":"66 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":"133420966","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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