Abstract:
The method involves determining form and strength of a material abrasion during grinding and construction corresponding to respective operations over total length of a front edge. An elliptical profile (3) is generated with a thickening material (7) during grinding of the front edge. The thickening material corresponds in the form and strength of the detected material abrasion.
Abstract:
PROBLEM TO BE SOLVED: To make cooling efficiency uniform on a flow channel surface on upstream sides of a turbine blade train in a gas turbine for supplying cool air to the flow channel surface.SOLUTION: The flow channel surface 31, which is formed continuously with reference surfaces 32 on which a plurality of turbine blades 7b are installed and is positioned on the upstream sides of the turbine blade train, includes: depressed areas 31a which are at least part of areas overlapping with leading edges 7b1 of the turbine blades 7b when viewed from the direction of a turbine axis line L and are depressed from the reference surfaces 32; and protruding areas 31b which are at least part of areas positioned between the leading edges 7b1 of the turbine blades 7b when viewed from the direction of the turbine axis line L and protrude from the reference surfaces 32.
Abstract:
An apparatus for measuring erosion of an edge of an aerofoil portion of a fan blade includes a laser source to direct light at a position on the edge of the fan blade. A detector detects light reflected from the position on the edge of the fan blade. A computer measures the distance from the laser source to points on the edge of the fan blade to produce a profile of the edge in terms of x and z coordinates. The computer calculates the distances of points on the edge of the fan blade from a centroid of the profile. The computer detects peaks in the distance of points from the centroid of the profile. The computer selects two peaks with the greatest distance therebetween. The computer determines the distance between the two peaks and compares the determined distance and a predetermined distance to determine if there is unacceptable erosion.
Abstract:
PROBLEM TO BE SOLVED: To improve a diffuser pressure recovery efficiency in a centrifugal pump. SOLUTION: This centrifugal pump includes: a rotating shaft 53 rotatably supported by hollow casings 41, 45; impellers 51, 52 mounted on the rotating shaft 53; an impeller inlet passage 61 with fluid sucked to the impeller 52; and a diffuser 54 decelerating the fluid delivered from the impeller 52 and composed of a vaneless diffuser 54b and a vaned diffuser 54a. When D2 represents an impeller delivery diameter from the impeller 52 to the vaneless diffuser 54b, and D3 represents a vaned diffuser inlet diameter from the vaneless diffuser 54b to the vaned diffuser 54a, D3/D2 is set to 1.1-1.22 where. COPYRIGHT: (C)2011,JPO&INPIT