A VORTEX MODEL OF A HELICOPTER ROTOR
Journal Title: INCAS BULLETIN - Year 2009, Vol 1, Issue 1
Abstract
A vortex model of a helicopter rotor is presented. Each blade of the rotor has three degrees of freedom: flapping, lagging and feathering. The motions after each degree of freedom are also known for all blades. The blade is modelled as a thin vortex surface. The wakes are free fluid surfaces. A system of five equations are obtained: the first one is the integral equation of the lifting surface (rotor), the next three describe the wakes motion, and the last one relates the vortex strength on the wakes and the variation of vorticity on the rotor. A numerical solution of this system is presented. To avoid the singularities that can occur due to the complexity of vortex system, a desingularized model of the vortex core was adopted. A Mathcad worksheet containing the method has been written. The original contribution of the work. The calculation method of the motion of the wakes free vortex system, the development of the vortex cores in time and a new method to approximate the aerodynamic influence of remoted wake regions
Authors and Affiliations
Valentin BUTOESCU
Keywords
Related Articles
- EP ID EP85511
- DOI 10.13111/2066-8201.2009.1.1.5
- Views 149
- Downloads 0
Notes regarding the definition and applicability of supercirculation
The term supercirculation refers to an active, fluidic circulation control method used for a variety of aeronautical applications. In particular, this paper refers to supercirculation of entrainment wings. Using experime...
Comparative Review Study of Military and Civilian Unmanned Aerial Vehicles (UAVs)
Indian flying corps and Israel Aerospace Industries (IAI) forged long standing military ties, Israel aviation enterprises keeping up their strong position as best-in-class UAV manufacturers for both civilian and military...
Twisted Contact Structures in Turbulent Flows
The “hairpin” vortical structure initiated from a conceptual model of Theodorsen refers to a Ω-shaped vortex with two streamwise-oriented legs connected via a raised spanwise-oriented arch. Both computational and experim...
Numerical simulation of K-, N- and O-regime boundary-layer transition at early nonlinear stage
Boundary layer transition is usually associated with the amplification and breakdown of three-dimensional waves (3D waves). However, the details of the development of 3D waves in different transition regimes are not well...
BOOK REVIEWS: Quantitative Methods (Second Part) Probability Calculation, Issues of Numerical Computation, Linear Programming, The Method of the Critical Path, Financial Mathematics Metode cantitative (Volumul II) Calculul probabilitatilor, Elemente de calcul numeric, Programare lineara, Metoda drumului critic, Matematici financiare Sorin BERBENTE, Corneliu BERBENTE Editura BREN, Seria “Busi