Differential boundary-layer analysis and runback water flow model applied to flow around airfoils with thermal anti-ice
Abstract
Certification regulations require safe flight under icing conditions, therefore, ice protection on aircraft wings and horizontal stabilizers will be necessary if critical aerodynamic performance degradation is to be avoided. The present paper developed a numerical code for prediction of heat and mass transfer in two-phase flow around aeronautical airfoils. These systems are equipped with thermal anti-ice systems that are designed to keep the surface free of ice as much as possible. The code is able to estimate the temperatures and runback water around the airfoil surface due implementation of heat transfer submodels in a baseline thermal anti-ice model: 1) it estimated the airfoil surface wetness factor by means of a runback water film and rivulets pattern flow models; 2) it evaluated the laminar and turbulent boundary layers with pressure gradient and laminar-turbulent transition over non-isothermal and permeable airfoil surfaces by performing integral and differential boundary layer analysis; and 3) it predicted the onset position and length of the laminar-turbulent transition region with pressure gradient and turbulence level effects. The work followed a validation and verification process during the numerical code development. All submodels results were separately verified against experimental data. The numerical results of the thermal performance of the airfoil with the anti-ice baseline model, plus the present contributions, were validated against experimental data of an electrically heated NACA 0012 airfoil operating in the Icing Reseach Tunnel (IRT), NASA, USA. Copyright © 2009 by GAL da Silva, OM Silvares, EJGJ Zerbini, H Hefazi, H Chen, K Kaups.
- Atmospheric thermodynamics
- Boundary layer flow
- Heat transfer
- Ice
- Laws and legislation
- Mass transfer
- Multiphase flow
- NASA
- Pressure gradient
- Turbulence
- Turbulent flow
- Wings
- Aerodynamic performance
- Aircraft wing
- Airfoil surfaces
- Baseline models
- Boundary layer analysis
- Experimental data
- Flow model
- Heat and mass transfer
- Ice model
- Ice system
- Icing conditions
- Laminar-turbulent transition
- Nonisothermal
- Numerical code
- Numerical results
- Submodels
- Surface free
- Thermal Performance
- Turbulence level
- Turbulent boundary layers
- Validation and verification
- Water film
- Water flow model
- Laminar boundary layer
URI
https://www.scopus.com/inward/record.uri?eid=2-s2.0-77958183454&partnerID=40&md5=1aa59edf0fe9934447693c8951177fa1https://repositorio.maua.br/handle/MAUA/976
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