Recent National Transonic Facility test process improvements

Investigation of transonic Reynolds number scaling on a twin-engine transport

“…[6][7][8][9][10]) is a unique national facility ( Figure 1) that enables tests of aircraft configurations at conditions ranging from subsonic to low supersonic speeds at Reynolds numbers up to full-scale flight values, depending on the aircraft type and size. The facility is a fan-driven, closedcircuit, continuous-flow, pressurized wind tunnel capable of operating in either dry air at warm temperatures or nitrogen from warm to cryogenic temperatures.…”