caa a22 4500 475797124 CHVBK 20180406123727.0 cr unu---uuuuu 170329e20000501xx s 000 0 eng 10.1007/s000330050008 doi (NATIONALLICENCE)springer-10.1007/s000330050008 Low-drag airfoils for transonic flow of dense gases [Elektronische Daten] [Z. Rusak, C.-W. Wang] Abstract.: Low-drag airfoils for transonic flow of BZT gases are constructed through a nonlinear small-disturbance theory on this topic. This kind of transonic flow is characterized by the high nonlinearity of the fluid thermodynamic behavior that is closely coupled with its compressible flow dynamics. Utilizing BZT gases may result in low drag exerted on airfoils operating at high transonic speeds. This advantage may be further improved by a proper design of the airfoils' shape. The modified airfoils are characterized by arcs along which the flow is sonic and that connect to a sharp tail. These airfoils may give the highest free stream Mach number for which the flow is nowhere supersonic. Using an analysis in the hodograph (velocity) plane, an analytical formula is derived to describe the sonic arc. Numerical computations using the Euler equations demonstrate that the modified airfoils have significantly lower pressure drag against standard airfoils and their critical Mach number is increased to higher values. Birkhäuser Verlag, Basel,, 2000 Key words. Transonic flows, dense gases, airfoil@s design nationallicence Rusak Z. Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA, e-mail: rusakz@rpi.edu, US aut Wang C.-W Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA, currently at the Department of System Engineering, Chung-Cheng Institute of Technology, Ta Shi, Taoynan 33509, Taiwan, R.O.C., US aut https://doi.org/10.1007/s000330050008 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s000330050008 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rusak Z. Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA, e-mail: rusakz@rpi.edu, US aut NATIONALLICENCE 700 1- Wang C.-W Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA, currently at the Department of System Engineering, Chung-Cheng Institute of Technology, Ta Shi, Taoynan 33509, Taiwan, R.O.C., US aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer