Snecma

Alstom Hydro France

Ge Renewable Technologies

Serge Prigent

Patrick Wehrer

Didier Guerche

Christian Defrocourt

Daniel Quach

Jean-Louis Martial Verger

Jacques Bremond

Yvon Louesdon

Nicholas Balcet

Jean-Claude Hanny

Rajesh Panchal

Nicolas Balcet

Tomas Bustarret

Philippe Feriol

The present invention relates to a hydraulic installation where sediment concentration in the water flow circulating through the cited installation is monitored continuously. According to the invention, the hydraulic installation comprises a pressure-reducing device and a primary sensor: the pressure reducing device decreases the pressure and discharge of upstream water flow, comprising sediments, allowing that the primary sensor can operate continuously measuring sediment concentration from the upstream water flow. The hydraulic installation also comprises a calibrating device, providing the primary sensor with a reference value to be used for comparison matters and for establishing the content of sediment in the water flow.

Hydraulic installation and method of operating such an installation

A method for deburring a ceramic foundry core obtained by injecting a ceramic paste, the paste including a binder having a predetermined glass transition temperature, into a mold and having at least one surface portion with a surplus of material forming a burr to be eliminated. The method includes the following stages: a) disposing and attaching the molded, unfired foundry core onto a mounting; b) placing a milling tool, having an elongated shape with a helically cut edge, onto a tool holder; c) causing the tool to rotate around its axis and touching the milling tool to the surface portion to be deburred; and d) freezing the surface portion to be deburred such that the foundry core is maintained at a temperature lower than a glass transition temperature during the deburring operation.

Method for deburring a ceramic foundry core

This hydraulic machine member has at least one flow of water passing through it, and comprises at least one wetted surface extending between two edges of the member, at least one of the edges of the member and part of the adjacent wetted surface being reinforced and formed by at least one removable solid element made from material having a high resistance to abrasion.

Hydraulic machine member with an abrasion-resistant reinforced edge and a hydraulic machine using this member

The device () serves to separate solid particles from the water of a flow (E) feeding a hydraulic machine of the turbine, pump, or turbine-pump type. The device has flow inlet and outlet zones () for the flow that are spaced apart along an advance axis (X) of flow advance through the device (). The device () comprises a plurality of ducts () placed in parallel, each having a mouth and a downstream end between the inlet zone () and the outlet zone (). In section perpendicular to the advance axis (X), each duct presents a section in the form of a spiral with a radius of curvature that increases from the mouth towards the downstream end or from the downstream end towards the mouth, with each duct () presenting a thickness measured in a generally radial direction relative to the advance axis that is less than 10% of the width (l) of said duct, measured parallel to said axis (X).

Solid particle separator device and a hydraulic installation including such a device

A tool for manufacturing a casting core, for a turbomachine blade with a leading edge and a trailing edge, the core includes a thick part on the leading edge side and a thin part on the trailing edge side is disclosed. The tool includes first and second dies of the core that are moveable in a direction with respect to each other between a molding position and a demolding position, sub-components that are moveable relative to the dies, and mechanical ejectors that are provided on the first and second dies. The parts of the dies corresponding to the thin part of the core do not include a movable sub-component. The thin part of the core is demolded along the main direction of opening of the first and second dies.

Tool for manufacturing ceramic casting cores for turbomachine blades

The present invention relates to a ceramic core used in the manufacture, by lost wax casting, of a turbomachine blade with cooling cavities and a squealer, comprising at least one main core, wherein the main core () comprises an element (B) shaped so as to constitute the squealer and an element (SB) shaped so as to constitute at least one cavity beneath the squealer, the two elements leaving between them a space () shaped so as to constitute, at least in part, the bottom wall of the squealer. In particular, the elements (B andSB) are joined together by ceramic rods (TG).

Core for turbomachine blades

A process for manufacturing a ceramic foundry core having at least one thin region with a thickness 'e', in particular in of a turbomachine blade trailing edge, including the forming in a mold of a mixture including a ceramic particle filler and an organic binder, the extraction of the core from the mold, the binder removal and consolidation heat treatment of the core. The process is one in which a core is formed in the mold, the region of this core being thickened relative to the thickness 'e' by an overthickness E and in which the overthickness is machined after the core has been extracted from the mold and before or after the heat treatment operation. In particular, the machining is carried out mechanically by milling, either with removal of chips on the cores before firing, or by abrasion on the fired cores.

Process for manufacturing ceramic cores for turbomachine blades

A method of manufacturing a cast core with at least one recess, corresponding to a partition of a turbomachine blade, includes the steps of shaping, in a mold, a mixture containing a ceramic particles filler and an organic binder; forming a core rough casting without the recess in the mold; extracting the core rough casting from the mold; machining the recess in the core rough casting thereby forming a machined core with the recess; removing the organic binder from the machined core; and heat treating the machined core to consolidate the machined core. The step of machining the recess is performed before the step of heat treating the machined core.

Growing community of inventors

Le Sappey en Chartreuse, France

Serge Prigent