Predicting the Performance of Jet Flap Configurations: Semi‐Empirical Theory and Comparison With Available Tests Results

Abstract

A simplified method for estimating the aerodynamic properties of thin flapped aerofoils influenced by high velocity jet sheets is developed. It is assumed that the main flow around the aerofoil does not influence the velocity distribution in the jet. Considering also the effect of the mixing with the surrounding air, a real jet is supposed to be replaced by an appropriate aerodynamic model, having a linear downstream distribution of velocity adopted on the basis of test data. Both thin aerofoil and the jet sheet are adequately replaced by vortex distributions,so that the lift and the pitching moment of the aerofoil influenced by the jet may be evaluated in the usual manner. Comparison with some available experimental results shows that the proposed semi‐empirical method gives good agreement with experiment.

Citation

Pivko, S. (1962), "Predicting the Performance of Jet Flap Configurations: Semi‐Empirical Theory and Comparison With Available Tests Results", Aircraft Engineering and Aerospace Technology, Vol. 34 No. 1, pp. 20-24. https://doi.org/10.1108/eb033508