mxaxai wrote:1.: Depends. Sometimes it remains supersonic (weak oblique shock), sometimes it slows to subsonic (strong oblique shock, normal shock, detached shock).
2.: There are no shock waves in an expansion fan. Shock implies compression, i. e. the opposite of expansion. There is an infinite number of Mach waves, however.
3.: A bow shock / detached shock leads to subsonic flow between the shock and the object. Typically, the bow shock becomes a weak oblique shock further away from the object (with the flow being deflected but remaining supersonic in that area). Unless we're talking about hypersonic flow (Mach>5), the properties of the air don't change dramatically - except for the compression by the shock, of course.
Military Aircraft Every type from fighters to helicopters from air forces around the globe
Classic Airliners Props and jets from the good old days
Flight Decks Views from inside the cockpit
Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior
Cargo Aircraft Pictures of great freighter aircraft
Government Aircraft Aircraft flying government officials
Helicopters Our large helicopter section. Both military and civil versions
Blimps / Airships Everything from the Goodyear blimp to the Zeppelin
Night Photos Beautiful shots taken while the sun is below the horizon
Accidents Accident, incident and crash related photos
Air to Air Photos taken by airborne photographers of airborne aircraft
Special Paint Schemes Aircraft painted in beautiful and original liveries
Airport Overviews Airport overviews from the air or ground
Tails and Winglets Tail and Winglet closeups with beautiful airline logos