Deutsches Zentrum Fur Luft-und Raumfahrt E.v.

Siemens Mobility Gmbh

Kai Backhaus

Jürgen Arnold

Lorenz Tichy

Frauke Schossig

Holger Hennings

In order to suppress aeroelastic instabilities on a transonically operating aircraft comprising a pair of wing halves at which a transonic flow forms spatially limited supersonic flow regions that each, in a main flow direction of the flow, end in a compression shock, a boundary layer of the flow is temporarily thickened-up in at least one supersonic flow region at at least one of the two wing halves, when approaching a flight envelope of the aircraft with increasing flight Mach number of the aircraft. The boundary layer of the flow is thickened-up to such an extent that the compression shock at the end of the respective supersonic flow region at the present flight Mach number of the aircraft induces a separation of the boundary layer of the flow from the wing half.

Method of and transonically operating aircraft having devices for suppressing aeroelastic instabilities

In a method of expanding a flight envelope of an aircraft comprising a pair of wing halves and extendable leading-edge flaps at leading wing edges of the wing halves towards higher transonic flight Mach numbers, at least one of the leading-edge flaps at one of the two wing halves is extended in flight direction, when approaching the flight envelope with increasing flight Mach number of the aircraft.

Growing community of inventors

Wolfenbüttel, Germany

Kai Backhaus