Abstract: A centrifugal fan having a plurality of formed vortex generators fixed onto the outer wall of an annular member leading into the air inlet for the fan-wheel to cause mixing of the slower air discharged from the wheel and the skin friction air current created by the wheel.

Abstract: An adjustment system for centering a turbojet wheel, and a turbojet equipped with a mechanism enabling the system to be applied and, more particularly, an adjustment system for centering a turbojet wheel in the stator ring that encircles it. The system includes, for purposes of determining the degree and direction of any possible off-centering of the wheel and ring and allowing the off-centering to be easily compensated for by a removable device for measuring the degree and direction of off-centering of the wheel with respect to the ring, and a mechanism connected to the fixed bearing closest to the wheel for bringing the value of off-centering back within preset limits.

Abstract: A multi-stage hydraulic machine which includes a plurality of runner housings or chambers each having a runner positioned therein, a head cover and an intermediate speed ring, movable guide vanes at an outside portion of the runner housing or chamber of the highest pressure stage, each of the runners having a runner crown with an exhaust hole bored through it, each of the runner housings or chambers having an exhaust chamber formed at the exit portion of the exhaust hole and a device for sealing water at the radially outside portion of the exhaust chamber, and a plurality of exhaust paths provided in each of the exhaust chambers to the exterior of the machine respectively. Additionally, a method for operating the machine is disclosed.

Abstract: A torsion damping assembly, e.g. for a clutch disc, comprises two coaxial parts mounted for relative angular displacement within a predetermined range against the action of circumferentially acting resilient means. One of the coaxial parts comprises a transverse hub flange and the other of the coaxial parts comprises two transverse annular guide members or washers disposed on the respective sides of and spaced axially from the hub flange. The guide members are connected to each other by spaced axial connecting members. At least one strap member also interconnects the annular guide members, a first end of the strap member being fixed at one of the guide members, and a second end of the strap member circumferentially spaced from the first end being fixed to the other of the guide members.

Abstract: An impeller for a centrifugal impeller comprising a disc portion, a coaxial hub portion having a longitudinal through-bore by which the impeller is mounted on a rotatable shaft, and a plurality of blades in any one of several forms. The tip of each blade is curved in a direction opposite to the rotation of the impeller more than the rest of the blade. The radius of the tip curve decreases uniformly toward the radially outer end of the blade. This tip treatment produces improved isentropic efficiency.

Abstract: In a compressor section of a gas turbine engine, a double wall casing is provided wherein a nonstructural inner wall is removably attached to a thin, structural outer casing. The inner wall isolates the thin stator outer casing during transient turbine operations of throttle burst and throttle chop. During throttle burst and chop, the nonstructural inner wall delays rapid heating and cooling of the relatively thin-walled outer casing, and reduces radial misalignment between the stator casing and rotor due to uneven thermal expansion and contraction. The nonstructural inner wall evens-out thermal expansion and contraction of the stator casing with respect to the rotor. To fine tune the actual clearances between stator and rotor and prevent the casing outer wall from overheating, thermal insulation material is used between the nonstructural inner wall and outer casing.

Abstract: A faucet handle for a cartridge type non-rising valve including a lower anchoring piece and an upper anchoring piece secured to the non-rising valve casing with a rotation member disposed between the upper and lower anchoring pieces and coupled to the non-rising valve stem to rotate the valve through a limited arc of rotation.

Abstract: A gas turbine blade in which are provided inter alia two chambers for the circulation of cooling fluid, lying in proximity to the leading and trailing edges of the blade respectively, two conduits disposed respectively between the first chamber and the leading edge and between the second chamber and the trailing edge, and apertures connecting each conduit to the chamber nearest to it. The blade is produced by diffusion-brazing two half-blades together. The chambers are formed in part in one, and in part in the other, half blade. In order to produce the conduits and apertures by means of grooves engraved in the facing surface of the two half blades, the interface of the two half-blades divides said conduits and apertures in two.

Abstract: Electromagnetic wave concentrator, especially a solar energy concentrator, in the form of a thin plate made up of a succession of identical light coupling modules each made up of two identical prisms made of transparent materials and having different indexes of refraction. The physical characteristics of the prisms are selected to cause continuous bending of the light beams, striking an incident face of the concentrator, toward a terminal edge surface of the concentrator plate.

Abstract: A blade for a fluid flow engine, especially a gas turbine, has a protective coating against injurious attack by the propellant or working medium. A metal blade having a diffusion layer or a sprayed coating for inhibiting corrosion is known. Such coating renders the blade highly resistant against heavily erosive and corrosive attack, especially by pulverized coal combustion gas or similar agents. The present blade is made of ceramic material, especially a dense ceramic material with a surface layer of at least one of the following materials: TiN, TiC, B.sub.4 C, BN and titanium carbon nitride. These materials are easy to apply and provide a good bond with the ceramic material. If the ceramic materials are silicon carbide (SiC) or silicon nitride (Si.sub.3 N.sub.4) an especially good bond is achieved. This coating strongly resists removal, as it does oxidation and heat. Local removal down to the ceramic material, as it may result from rather long service, is recognizable immediately.

Abstract: A circumferentially extending structure 30 for containing particles having an axial component of velocity and a radial component of velocity is disclosed. The structure includes an inner casing, such as the first casing 48, and an outer casing, such as the second casing 50. The outer casing is flexible. The outer casing is formed of a plurality of layers of fabric and a means for applying a load to the fabric such as a plurality of bars 80, 82 and turnbuckles 74. A method of forming the structure is disclosed. The method includes the step of wrapping a fabric having a first length about the inner casing and the step of stretching the fabric to a second length to affect the operative response of the fabric to the impact of a particle.

Abstract: A method of installing the diffusers and impellers on a shaft of a centrifugal pump uses a latent locking member. The locking member is positioned within a counterbore of each impeller when the impellers are placed on the shaft between each diffuser. After positioning, the locking member is activated to bond the impellers to the shaft. Preferably, the locking member is a heat activated material that requires heat for the material to become fluid. On cooling, the adhesive forms a rigid bond with the shaft.

Abstract: A centrifugal pump assembly comprising one or more bowl castings each housing an impeller and also two or more individual fluid passageways for the flow of fluid discharged by an impeller to the next impeller, the passageways having some exterior walls defining the exterior of the assembly. By changing the number of the individual passageways, the specific speed of the pump, i.e., the ratio of the amount of energy imparted to the fluid and the amount of fluid being pumped, can be changed.