Showing papers on "Cavity wall published in 1971"

Internal cooling for turbine vanes

Abstract: A structure for internally cooling an airfoil vane in an axial flow gas turbine. The vane defines a cavity which approximates the shape of the outer airfoil. A frame of similar shape is inserted into the cavity in spaced relation therefrom. The cavity walls and the frame cooperatively define a cooling passageway. A row of oblong apertures is disposed along the leading edge of the frame and a second row of apertures is disposed along the convex side of the frame, the second row of apertures being inclined relative to the cavity wall. Pressurized cooling air enters the frame, is forced through the apertures, impinges against the inner walls of the vane, and flows along the passageway to cool the vane.

Pressure Buckling of Ring Encased in Cavity

Abstract: The buckling of a ring subjected to external pressure but supported by a rigid cavity wall is investigated using small deflection linear theory. It is assumed that the cavity wall moves in with the deflection of the ring prior to the onset of buckling. The ring buckles locally with an arc length no greater than π depending on the ratio of the radius of the ring to the radius of gyration of the cross section, R /ρ. A curve is given for numerical evaluation of the critical pressure for all values of R /ρ in a ring or an infinitely long cylindrical shell.

Nozzle and cavity wall cooling limitations on specific impulse of a gas-core nuclear rocket.

Abstract: Experimental and theoretical study of the performance of a gas-core nuclear rocket, showing that in a uranium plasma nuclear rocket with an 8-ft cavity diameter the cavity wall can be cooled up to a power level of 7400 MW when the rocket operates at a pressure of 1000 atm and the propellant mass flow rate is 10 lbm/sec. A maximum cavity specific impulse of 5800 sec was obtained under such operating conditions. The fact that the wall heat flux was much lower for reactor powers below this level is linked to the presence of a relatively cool, opaque insulating layer of seeded propellant between the hot plasma and the solid wall. The additional coolant required for nozzle protection reduced the maximum cavity specific impulse to 5200 sec.

Sonar transducer assembly

Abstract: The sonar transducer assembly described includes a seamless diaphragm having a hollow cylindrical cavity closed at one end, an axis perpendicular to the plane of the diaphragm, an annular 45* reflector, and an annular decoupling ring between the cavity and the reflector. A cylindrical sound transducer is positioned within the cavity such that when it is energized, the sound waves are generated radially outward through the cavity wall until reflected by the reflector along the axis of the diaphragm. This diaphragm may be positioned within a flange mounted in the nozzle or exhaust pipes of bulk storage bins or tanks. The seamless diaphragm insulates the transducer from any corrosive effects of the material stored therein and at the same time permits the sound waves to travel down to the storage enclosure for determination of the level of the material stored therein.

Apparatus for use in lining cavities

Abstract: Cavities are lined by means of apparatus which is inserted in the cavity and expanded to apply lining material, placed between apparatus and cavity wall, onto the wall of the cavity.

Apparatus for making brake shoes

Abstract: A heated brake shoe press has a longitudinal open end cavity defined by a base and cover. One end of the cavity may be closed by a movable platen. A movable plunger projects into the other end of the cavity and is slideably engaged with the cavity throughout its length. Inserts and liners are slideably engaged in the cavity in a given order and define a plurality of molding cavities that are fillable with moldable material. The heat, and the pressure exerted by the plunger configures the material in the molding cavities to a shape defined by the inserts and liners. After forming, the platen may be moved to an open position and the inserts and configured material may be pushed out of the cavity by the plunger. To accommodate such action and to reduce galling and scoring of the cavity walls, Teflon buttons are attached to the insert faces which engage the cavity wall.

Multiphase nuclear fuel cavity reactors for power generation

Abstract: : The characteristics and problems of cavity reactors with fuel in the solid, solid/liquid, solid/liquid/gas, liquid and liquid/gas states are explored analytically in an effort to uncover interesting operational regimes. Operation with the fuel in a thin liquid film on the cavity wall promises continuous fission debris removal and interesting performance (e.g. 2000 MW(th) in a 5 ft radius cavity), but poses problems of container penetration by the fuel and gravity induced fuel flow. These problems are avoided when the fuel film is solid at the expense of power and operational duration. (Author)