On the Calculation of Non-Linear Aerodynamic Characteristics and the near Vortex Wake,
TECHNION - ISRAEL INST OF TECH HAIFA DEPT OF AERONAUTICAL ENGINEERING
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This investigation presents methods for the calculation of the distribution of vortices on the wing planform and on the trailing vortex wake by iterative procedures based on the application of the vortex lattice method concepts. In the case when the trailing vortices are taken to leave the wing at the trailing edge only the calculation results in determining the linear aerodynamic characteristics and the shape of a rolled up wake. The present investigation considers the cases when the vortices from each cell are allowed to leave the wing planform at a fixed angle, and the case when the vortex shedding can be limited to the planform edges only. In these cases non-linear aerodynamic characteristics are evaluated. The corresponding trailing vortex wakes were first calculated by using discrete ideal vortices. It is now proposed to use a finite core vortex model thereby eliminating some of the numerical problems associated with the use of the ideal vortices.