1
مکانیک::
عدد رینولدز
Both the HP and LP turbochargers have been optimized for operation at the low Reynolds numbers experienced with HALE operation.
Component efficiencies capable of producing an overall efficiency of 0.70 are possible even with low Reynolds numbers.
• Impact of installation and low Reynolds numbers on heat exchanger efficiency.
The tests confirmed that the impact of low Reynolds numbers (high altitude) on centrifugal compressor performance is relatively low and is primarily related to the flow capacity of the LP compressor.
Nomenclature A Aspect ratio [-] Ma Mach number [-] Cd Airfoil section drag coefficient [-] n Revolutions per minute [1 min-1] CD Drag coefficient [-] p Pressure [Pa] CD0 Zero-lift drag coefficient [-] p Power [W] Cl Airfoil section lift coefficient [-] r/R Relative propeller radius [-] CL Lift coefficient [-] Re Reynolds number [-] cm0 Pitching moment coefficient [-] S Wing area [m2] Cp Pressure coefficient [-] T Thrust [N] d Diameter of the propeller [m] v Velocity [ms-1] D Drag [N] x/c Relative chord length [-] e Oswald's efficiency factor [-] a Angle of attack [°] g Acceleration of gravity [9.81 ms-2] P Geometric blade pitch angle [°] H Altitude [m] n Propeller efficiency [-] L Lift [N] n 3.1416 [-] m Takeoff weight [kg] p Density [kgm-3]
واژگان شبکه مترجمین ایران