Navier-Stokes Computations and Experimental Comparisons for Rudder Efficiency Analysis in the Moderately Steep Spin Part II: Computation Method
Mirko Koziæ
An analysis of the rudder efficiency at flow conditions that correspond to a moderately steep spin is made using a Navier-Stokes code and wind tunnel flow visualization. The code is used for determining the flow field around the LASTA-95 airplane wind tunnel model. The numerical and experimental value of the aerodynamic coefficients and the vector flow field over the vertical tail are compared for configurations with and without the horizontal tail. The purpose of the analysis is in showing the influence of the horizontal tail on the flow field over the vertical tail, especially over the rudder. It is seen that the horizontal tail wake influences the most part of the rudder making it completely inefficient in the spin recovery.
Key words: airplane, spinning maneuver, airplane rudder, fluid dynamics, flow visualization, Navier-Strokes equations, effectiveness analysis.