Quiz 5

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    Created by
    Nestor

    Cards (46)

    • Is Kutta condition satisfied at a subsonic trailing edge?
      yes
    • Can Bonney‘s theory treat tapered trapezoidal wing planforms?
      No
    • Can Bonney’s theory handle non-flat plate wings?
      yes
    • Can Table 11.1 of B&C handle a wing with the double-wedge airfoil?
      yes
    • Is the thickness ratio of the thick airfoils in Table 11.1 fixed?
      no
    • Bonney's theory can handle any supersonic flight Mach number and wing aspect ratio, so long as the tip Mach cones are non-
      intersecting
    • For an unswept, flat-plate rectangular wing, the region _________ the tip Mach cones is purely 2-D aerodynamics
      Outside
    • Name the supersonic airfoil in Table 11.1, with curved surfaces?
      Biconvex
    • For a swept airfoil, it is the component of M1 __________ to the LE that generates no aerodynamics
      parallel
    • A ___________ LE on a sweptback wing will produce shock waves
      Supersonic
    • Is Ackeret's Supersonic Airfoil Theory a nonlinear, large-perturbation theory?
      No
    • Does the Cm (Coefficient of moment) of the airfoil generally depend on airfoil AOA?
      Yes
    • Ackeret's Theory predicts a location of ____________ for the aerodynamic center

      mid-chord (or 1/2 or c/2)
    • For a flat plate airfoil at an AOA, the lower surface is a ___________ surface
      compression (or Cp > 0)
    • For a flat plate airfoil at an AOA, the upper surface is a ___________ surface
      expansion ( or Cp < 0)
    • Can Ackeret's theory generate the pressure distribution on a thin "supersonic" airfoil?
      Yes
    • Can small-disturbance hypersonic flow be linearized?
      No
    • Can Ackeret's theory generate the pressure distribution on the airfoil?
      Yes
    • Is Ackeret's theory as accurate as Shock-Expansion theory for small angles?
      Yes
    • The location of the ___________ (give abbreviation) of the airfoil according to Ackeret's theory is the mid-chord point
      AC
    • Can Ackeret's predict Cm about LE point?
      Yes
    • Can Ackeret's help us calculate the Cm about any point along the chord line?
      Yes
    • Does the Cd of the airfoil depend on airfoil camber?
      Yes
    • Does the lift coefficient here depend on AOA?
      Yes
    • For a flat plate airfoil at an AOA, the _______ surface is an expansion surface
      Upper
    • For a flat plate airfoil at an AOA, the _________ surface is a compression surface
      Lower
    • Give the general formula for Xcp in terms of Cl and CM_LE, where the latter is + nose up
      Xcp = -Cm_LE/Cl
    • Are we to enforce the Kutta condition at a supersonic trailing edge?
      No
    • Can Bonney's theory treat a wing with swept trapezoidal planform?
      No
    • Can Bonney's theory handle wings with NACA 0012 airfoil section?
      No
    • Can Table 11.1 of B&C handle a wing with a double-wedge airfoil?
      Yes
    • Bonney's Theory can handle any supersonic flight Mach number and wing aspect ratio, so long as the tip Mach cones are __________
      Non-Overlapping
    • For a swept airfoil, it is the component of M1 ____________ to the LE that generates the aerodynamics
      Normal
    • The CFM international RISE stands for
      Revolutionary Innovation for Sustainable Engines
    • What is the CFM International RISE?

      An open rotor engine that is currently being developed by CFM International.
    • 50-50 joint venture with which two companies?
      GE Aerospace and French Safran Aircraft Engines.
    • The engine is planned to support both hydrogen and sustainable aviation fuels, and it plans to achieve a 20% reduction in fuel burn and in carbon dioxide emissions.
    • RISE has only a single-stage open rotor
    • The two stages of the RISE have variable pitch control
    • RISE will also use a recuperator, which captures waste heat from the exhaust gas to pre-heat the air that exits the compressor before it enters the combustor.
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