Cd and CL (drag and lift coefficients) are given according to Reynolds numbers, the extrapolation to the hydrodynamics is therefore possible. If this object is a kind of hovercraft (see propellers ) hydrodynamic resistance forces will be significantly reduced, but we need to quantify the energy expended to create air pressure.
Nov 26, 2018 · The lift coefficient is a number that's used to compare and model the performance of airfoils and wings. The lift coefficient is also one of the variables that goes into the lift equation, so when you solve for the lift coefficient, you're essentially working a rearranged lift equation.
Lift is proportional to dynamic pressure, therefore it is best to keep the dynamic pressure constant for the comparison. Now for the viscous drag over Reynolds number: From the same book I copied a plot of lots of experimental data which shows the trend nicely: Skin friction over Reynolds number, from page 2-6 in Fluid Dynamic Drag. The choices for S and Lare arbitrary, and depend on the type of body involved. For aircraft, traditional choices are the wing area for S, and the wing chord or wing span for ℓ and the dynamic pressure for q∞ .The non-dimensional lift, pressure drag and moment coefficients are respectively defined as : Dynamic lift holds great importance in many fields such as aerodynamics and many ball sports. The dynamic lift is given consideration while designing the rotor ships and aeroplanes. The figure above shows an aerofoil, which is a solid piece shaped to provide an upward dynamic lift when it moves horizontally through the air.
I want to use to calculate drag and lift force from pressure coefficient of a sphere. ... vec(n) / q ; q=dynamic pressure ) ... variation of camber and thickness with lift and drag force by ANSYS ... NEWTONIAN AERODYNAMICS FOR TANGENT OGIVE BODIES OF REVOLUTION INTRODUCTION In modifying the known zero lift aerodynamics for vehicles with tangent ogive noses to correspond to other configurations, the tangent ogive aerodynamics must be known. The available methods of prediction are limited to small angles of attack. contributors to fluid dynamics drag: skin friction and from drag. The drag coefficient of a lifting airfoil or hydrofoil also includes the effects of lift induced drag. The drag coefficient of a complete structure such as an aircraft also includes the effects of interference drag. The lift equation is 𝐿= 1 2 𝜌𝑣2𝐶𝑙 𝐴 Like lift, drag is proportional to dynamic pressure and the area on which it acts. The drag coefficient, analgous to the lift coefficent, is a measure of the amount of dynamic pressure gets converted into drag. Unlike the lift coefficient however, engineers usually design the drag coefficient to be as low as possible. Example - Aeroplane and Airfoil Lift - Drag and required Thrust Power. For an aeroplane with velocity 100 m/s, wing area 20 m 2, a drag coefficient 0.06 and a lift coefficient 0.7 - the lifting force acting on the airfoil can be calculated. F L = 0.7 1/2 (1.2 kg/m 3) (100 m/s) 2 (20 m 2) = 84000 (N) = 84 (kN) The drag force can be calculated