@incollection{Mertens1997,
  author    = {Mertens, Josef},
  title     = {Supersonic laminar flow},
  series = {New design concepts for high speed air transport. - (Courses and lectures / International Centre for Mechanical Sciences ; 366)},
  booktitle = {New design concepts for high speed air transport. - (Courses and lectures / International Centre for Mechanical Sciences ; 366)},
  editor    = {Sobieczky, H.},
  publisher = {Springer},
  address   = {Wien [u.a.]},
  isbn      = {3-2118-2815-X},
  doi       = {10.1007/978-3-7091-2658-5_18},
  pages     = {275 -- 290},
  year      = {1997},
  abstract  = {Supersonic transports are very drag sensitive. Technology to reduce drag by application of laminar flow, therefore, will be important; it is a prerequisite to achieve very long range capability. In earlier studies it was assumed that SCTs would only become possible by application of laminar flow [376]. But today, we request an SCT to be viable without application of laminar flow in order to maintain its competitiveness when laminar flow becomes available for subsonic and supersonic transports. By reducing fuel burned, laminar flow drag reduction reduces size and weight of the aircraft, or increases range capability -whereas otherwise size and weight would grow towards infinity. Transition mechanisms from laminar to turbulent state of the boundary layer flow (ALT, CFI, TSI) function as for transonic transports, but at more severe conditions: higher sweep angles, cooled surfaces; higher mode instabilities (HMI) must at least be taken into account, although they may not become important below Mach 3. Hitherto there is a worldwide lack of ground test facilities to investigate TSI at the expected cruise Mach numbers between 1.6 and 2.4; in Stuttgart, Germany one such facility -a Ludwieg tube- is still in the validation phase. A quiet Ludwieg tunnel could be a favourable choice for Europe. But it will require a new approach in designing aircraft which includes improved theoretical predictions, usage of classical wind tunnels for turbulent flow and flight tests for validation.},
  language  = {en}
}
@incollection{Mertens1997,
  author    = {Mertens, Josef},
  title     = {Reduction of aerodynamic drag (RaWid)-Status after the first year of the program},
  series = {New results in numerical and experimental fluid mechanics. - (Notes on numerical fluid mechanics ; 60)},
  booktitle = {New results in numerical and experimental fluid mechanics. - (Notes on numerical fluid mechanics ; 60)},
  publisher = {Vieweg},
  address   = {Braunschweig [u.a.]},
  isbn      = {3-528-06960-0},
  doi       = {10.1007/978-3-322-86573-1_2},
  pages     = {7 -- 14},
  year      = {1997},
  abstract  = {The technology programme "Reduction of aerodynamic drag (RaWid)" for high speed aerodynamics at Daimler-Benz Aerospace Airbus is sponsered by the German ministry for education, research and technology since July 1, 1995. Connected to this industrial programme are the cooperation programmes "MEGAFLOW" under leadership of the DLR and "Transition" by the DFG, and several contributions by DLR and universities. The programme is oriented towards technologies required for a MEGALINER which gains momentum by the ambitious plans for a new large Airbus A3XX. In the first year new technological steps were undertaken in theory, design and experiment. Some critical steps were verified by wing designs checked in wind tunnel tests.},
  language  = {en}
}