velocity of sound- Mach Number- critical mach no- drag divergence mach number
What is the velocity of sound? First we will know what sound is. Sound is the resulting effect of molecular collisions. Speed of sound is the speed of transmission of a disturbance (Molecular collision) through a medium air. Mathematically, a= sqrt (ß* R* T) m/s ß- Ratio of specific heats Cp/Cv R- Gas constant T- Temperature As the altitude increases, the temperature changes hence speed of sound too. What is Mach number? Mach number came into picture of aerodynamics by engineers in order to make their analysis ease. Mach number (M) is defined as the ratio of Speed of aircraft to the speed of sound. It has no unit. M < 1 Subsonic M=1 Sonic M> 1 Supersonic (Upto 5) M>5 Hypersonic What is critical Mach number? Though the free stream Mach number is subsonic, the aerofoil upper surface accelerates it to attain sonic at some point. Whe...