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Swirl anti-ice system

  • US RE36,215 E
  • Filed: 10/20/1995
  • Issued: 06/01/1999
  • Est. Priority Date: 01/24/1986
  • Status: Expired due to Term
First Claim
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1. An anti-icing system for .Iadd.a nose cowl for an .Iaddend.annular .Iadd.inlet of an aircraft .Iaddend.jet engine . .housing.!. .Iadd.propulsion system for an aircraft .Iaddend.which comprises:

  • a source of high pressure hot gas;

    at least one conduit means to carry hot gases from said source;

    a substantially closed annular . .housing.!. .Iadd.single skin nose cowl having an exterior surface and an interior surface and positioned .Iaddend.at the leading edge of .Iadd.an inlet .Iaddend.of a jet engine .Iadd.propulsion system and arranged for grazing flow of ambient air over the outer exterior surface when the aircraft is in flight.Iaddend., the annular . .housing.!. .Iadd.nose cowl .Iaddend.containing a quantity of air;

    said at least one conduit means extending into said . .housing.!. .Iadd.nose cowl.Iaddend.;

    an outlet on the end of each of said at least one conduit means extending into said . .housing.!. .Iadd.nose cowl.Iaddend., said outlet oriented to eject said hot gases at high velocity substantially tangential to a centerline of said annular . .housing.!. .Iadd.nose cowl.Iaddend.;

    the mass flow rate of the gases and air swirling in said annular . .housing.!. .Iadd.nose cowl in a rotational direction around the interior of said annular nose cowl and in direct contact with the interior surface of such nose .Iaddend.being at least about three times the mass flow rate of gases leaving said outlet; and

    whereby the high velocity hot gases entrain .Iadd.said quantity of .Iaddend.air within said annular . .housing.!. .Iadd.nose cowl .Iaddend.so that the total volume of air and gases swirling around .Iadd.the interior of .Iaddend.said annular . .housing.!. .Iadd.nose cowl .Iaddend.has a substantially uniform temperature intermediate between that of said air and said hot gases .Iadd.and by direct contact with the interior surface of the nose cowl substantially uniformly heating the nose cowl to a temperature that is sufficiently high to preclude the formation of ice on the exterior surface of the nose cowl by the grazing flow of ambient air when the aircraft is in flight.Iaddend..

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