An integral analysis of momentum and thermal boundary-layers was used to determine the convective heat transfer coefficient on two-dimensional airfoils with thermal anti-ice system. The objective are to implement two different boundary-layer models: one assumed isothermal surface with prensence of a abrupt laminar-turbulent transition, while the other considered the boundary-layers over a non-isothermal surface with a smooth laminar-turbulent transition region. The onset and length of laminar-turbulent transition was estimated by classic empirical correlations. The surface equilibrium temperature distribution was predicted by an integrated airoil leading-edge interior-exterior thermodynamic analysis, compared to the literature and experimental data. The results indicate a validity of using boundary-layer anaylysis with smooth laminar-turbulent transition in predicting anti-icing convective heat transfer and surface temperature, but the simulation shows that surrounding static pressure has a large effect on the results accuracy.
Guilherme Araujo Lima da Silva,Otavio de Mattos Silvares,Euryale Jorge Godoy de Jesus Zerbini.Boundary-layers integral analysis :heatecd airfoils in icing conditions .AIAA-2008-475,2008
Guilherme Araujo Lima da Silva,Otavio de Mattos Silvares,Euryale Jorge Godoy de Jesus Zerbini,et al.Differential boundary-layer analysis and runback water flow model applied to flow around airfoils with thermal anti-ice .AIAA-2009-3967,2009
William Kays,Michael Crawford, Bernhard Weigand.Convective heat and mass transfer[M].4th ed.Beijing:Higher Education Press,2007
Abu-Ghannam B J,Shaw R.Natural transition of boundary layers:the effects of turbulence,pressure gradient and flow history[J].Journal of Mechanical Engineering Science.1980,22(5):213-228
Kamel M Al-Khalil,Charles Horvath,Dean R Miller,et al.Validation of NASA thermal ice protection computer codes III:the validation of antice .AIAA-97-0051,1997