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Chapter 9: Compressible, Subsonic Flows and Transonic Flows

Chapter 9: Compressible, Subsonic Flows and Transonic Flows

pp. 579-629

Authors

, US Air Force Academy, , US Air Force Academy
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Extract

Analysis capabilities are developed that include the impact of compressibility on the derivation of equations that govern subsonic compressible and transonic flows, including the relations to transform incompressible experimental data or geometry to subsonic compressible Mach numbers. Transonic flow is defined, including explanations for the flow characteristics that distinguish this flow regime from other flow regimes. Estimation techniques are developed for the critical and drag-divergence Mach numbers. The impact of transonic flow on aircraft design is discussed, including the impact of wing sweep on airplane aerodynamics and the role of supercritical airfoils. Finally, the transonic area rule is discussed, including the impact on transonic and supersonic aircraft.

Keywords

  • critical Mach number
  • transonic flow
  • Prandtl–Glauert equation
  • compressibility correction
  • drag-divergence Mach number
  • supercritical airfoils
  • transonic area rule

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