Modelagem e simulação da operação de sistema antigelo eletrotérmico de um aerofólio.

Differential Boundary-Layer Analysis and Runback Water Flow Model Applied to Flow Around Airfoils with Thermal Anti-ice

“…Recently other researchers confirmed conclusions about heat transfer and transition modeling relevance for simulation and design of anti-ice systems. 1,9,17,37,38 Experimental evidences 39 and numerical results 40 also confirmed the major role of transition during icing formation on unheated airfoils at certain conditions. The present paper adopts a set of algebraic correlations to estimate the onset and extension of the transition region that considers effects of Reynolds number, pressure gradient and freestream turbulence level, which can vary according experimental conditions in tunnel or in flight:…”

Numerical Simulation of Airfoil Thermal Anti-ice Operation, Part 2:Implementation and Results

“…The development and implementation of an airfoil anti-ice system numerical simulation [1][2][3][4][5] comprised the following: 1) application of an available external solver to the flow around the airfoil and to droplets trajectories; 2) development of a new thermodynamic solver (main program); 3) development of momentum and thermal boundary layer evaluation routines adequate for flow over nonisothermal and smooth surfaces with evaporation; and 4) validation of numerical predictions with reliable experimental data as well as other numerical codes results. The external solver ONERA2D requires a two-dimensional airfoil profile, atmospheric information [liquid water content (LWC), median volumetric diameter (MVD), T 1 , p 1 )], and flight condition (V 1 , ) to provide pressure, velocity, and local collection efficiency distributions around the airfoil to the present code.…”

“…The external solver ONERA2D requires a two-dimensional airfoil profile, atmospheric information [liquid water content (LWC), median volumetric diameter (MVD), T 1 , p 1 )], and flight condition (V 1 , ) to provide pressure, velocity, and local collection efficiency distributions around the airfoil to the present code. ONERA2D was validated at a broad range of conditions with experimental data and had its results extensively compared with other numerical codes [2,6,7], therefore, its results are considered acceptable not requiring further validation. As a matter of fact, any other external solver can be used to generate inputs to the present code.…”

“…Therefore, to depict more real interfacing conditions required a new mathematical model which was developed by Silva et al [1][2][3][4][5] for simulation of anti-ice systems. Its numerical implementation is summarized in Fig.…”

Water Film Breakdown and Rivulets Formation Effects on Thermal Anti-ice Operation Simulation

“…As discussed by Silva, Silvares and Zerbini, 14,18 in some cases when the water continuous lm extends downstream the impingement limits, the rivulets ow causes such a change in surface wetness that the model estimated solid surface temperature T w and overall heat transfer coecient U with unadequate deviation to icing tunnel test data. 19 In addition, the experimental observations of airfoil anti-ice system operation in icing tunnels and natural icing conditions in ight indicate that the liquid water ow approximately fully wets the airfoil surface in the impingement region and partially wets in downstream regions.…”