Showing papers on "Bend radius published in 1974"

Turbine blade tip seal

Abstract: In a gas turbine engine a seal which minimizes blade tip clearance at a design operating condition is disclosed. In the cold engine condition the radius of curvature of the sealing surface is less than the radius of the turbine wheel at the blade tips. At the design operating condition the radius of curvature of the sealing surface is substantially equal to the wheel radius. The seal is supported by arcuate hooks which are sufficiently flexible to accommodate the changes in the radius of curvature of the sealing surface over the indicated range.

Apparatus for bending material in the edgewise plane

Abstract: A combination hand-powered bending apparatus and edge bending radius pin assembly specifically adapted to bend flat stock in the edgewise plane This combination provides a means whereby flat stock of varying thickness and width can be clamped in the apparatus by the edge bending radius pin assembly element and bent in the edgewise plane to varying angles

Tube bending method

Abstract: Large diameter thin-walled pipe is bent by a ram pushing the pipe forward axially and a bending arm forcing the forward end of the pipe to follow a curved path. A heater mounted in a plane passing through the center of the bend heats the pipe in a narrow bending zone to a temperature substantially reducing the yield strength of the metal. Heat input and cooling are adjusted around the periphery of the bend to provide uniform temperatures irrespective of changes in pipe wall thickness resulting from the bending. The flexure axis of the bend may be moved inward or outward along the bend radius by pulling or retarding with the pivotal bending means, or may be fixed by providing relatively cool spots in the heated band at the desired location of the flexure axis. Guide means are provided which may pre-deform the pipe laterally to compensate for lateral deformation during bending or may prevent deformation during bending. The portion to be bent may have a different diameter or thickness to compensate for changes in dimensions resulting from bending.

Pulse dispersion for single-mode operation of multimode cladded optical fibres

Abstract: Pulse dispersions as low as 0.4 ns/km have been measured in multimode cladded fibres at a normalised frequency V = 125 and for a constant bend radius of 5.5cm. Particularly when the number of launched modes is small, the pulse dispersion, as well as the polarisation and angular width of the output beam, are strong functions of the degree of mode conversion.

Rigid line array suspension system

Abstract: A towed negatively buoyant rigid linear array has three forward floats of double ogival shape with a buoyancy equal to or slightly greater than the negative buoyancy of the array attached to a tow cable. The distance between the array and the middle float is equal to the desired array depth. The separation between the centers of the floats is equal to 2 pi times the minimum bend radius. A drogue line at the aft end of the array is adjusted to equal the depth at which the array is to be suspended.

On the critical radius in sheet bending

Abstract: • A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers.

Study on Vortex Tubes : Effect of the Bend of a Vortex Chamber on Energy Separation

Abstract: The energy separation measurements were made of a vortex tube with a bend. The results are summarized below. (1) The influence of the bend may be neglected, for a bend with R=γw and αl15°, and for a bend with Rg5γw and αl90°, where R, γw and α are the radius of curvature, the inner tube radius and the turning angle of the bend respectively. (2) For α>15° and R=γw, the tangential velocity and the total temperature gradient of a spiral flow decrease remarkably at the bend, therefore the energy separation in the spiral flow drops suddenly. (3) The larger the value of α, the larger the total enthalpy of air in the central reverse flow near the nozzle openings and also the mass flow rate of air passing from the nozzle openings directly to the cold end orifice. These facts decrease the energy separation in the bent vortex tube with a small radius of curvature.

Protection cover for pipe bends

Abstract: A protection cover for pipe bends produced from a plastic material by deep drawing into a shape which is similar to the shape which could be obtained if an integral and complete cover installed on a pipe bend had been cut along the interior generatrics line of the pipe bend and spread apart and opened up. The shape of the present protection cover is further modified by having a cup-shaped part generally elongated and rounded in transverse cross-section and having integral therewith tail sections located at each short side of the cup-shaped part. Each of the tail sections have a concave bend therein. The overall shape of the protection cover is such that when the cover is applied over an insulated pipe bend, the cover will have on its interior side a curvature radius that is essentially greater than the curvature radius of its exterior side, and the two curvature radii will have mutually different centers.

Cable locking hooks

Abstract: A safety cable hook is provided for receiving a cable loop which hook includes a rigid loop, a hook means rotatable on the loop and having a throat with a substantial radius in the plane of the loop exceeding the minimum bending radius of the cable, and a free end on said hook extending parallel to the rigid loop receiving a lock ring slidable in said rigid loop to prevent removal of said cable.