General Electric Company

Electric Power Research Institute Incorporated

Fred W Staub

Heinz Jaster

Fred Thomas Willett

Emil Donald Jarczynski

Eike Richter

Masayoshi Kuwata

Michael H McLaughlin

Michael Adelbert Sullivan

R Paul Chiu

Ariel C Jacala

Richard Mallory Davis

Ramachandran Muralidharan

Peter A Morgan

Gerald M Lazarek

A turbine rotor blade comprises a shank portion, a tip portion and an airfoil. The airfoil has a pressure side wall and a suction side wall that are interconnected by a plurality of partition sidewalls, defining an internal cooling passageway within the airfoil. The internal cooling passageway includes at least one radial outflow passageway to direct a cooling medium flow from the shank portion towards the tip portion and at least one radial inflow passageway to direct a cooling medium flow from the tip portion towards the shank portion. A number of mixing ribs are disposed on the partition sidewalls within the radial outflow passageways so as to enhance the thermal mixing of the cooling medium flow, thereby producing improved heat transfer over a broad range of the Buoyancy number.

Turbine blade cooling

Cooling of the rotor endwindings in a dynamoelectric machine is improved by providing radially-extending ducts in the spacers located between the concentric end turns of the rotor winding. The ducts have an inlet located near the radially inward end of the spacer and an outlet located near the radially outward end of the spacer. The inlet can be formed on either an axially-oriented surface of the spacer or a circumferentially-oriented surface of the spacer. The ducts direct cooling air into the cavities between the end turns in such a manner that the circulation velocity in the cavities is increased. This results in increased heat removal capability.

Gas cooled end turns for dynamoelectric machine rotor

In a gas turbine bucket having a shank portion, a radial tip portion and an airfoil having leading and trailing edges and pressure and suction surfaces, and an internal fluid cooling circuit, an improvement wherein the internal fluid cooling circuit has a serpentine configuration including plural radial outflow passages and plural radial inflow passages. The radial outflow passages, in one example, are shaped to have aspect ratios of about 3.3 to 1 and Buoyancy Numbers of &lt;0.15 or &gt;0.80. A method of determining a configuration for steam cooling passages for a bucket stage in a gas turbine is also provided which includes, in one example, the steps of:

Closed circuit steam cooled bucket

An dynamoelectric machine is provided having a hollow shaft adapted to receive fluid at one end and to discharge it at the other. The hollow shaft has a stack of laminations mounted thereon. A hollow disk is situated adjacent to and in contact with an axial end of the stack of laminations. The hollow disk includes a generally circular baffle for dividing the hollow disk into two interior sections and to cause the fluid to rotate at the same angular velocity as the hollow disk. The two interior sections are in flow communication with one another of the periphery at the generally circular baffle. The hollow shaft is in flow communication with one of the sections for providing fluid and in flow communication with the other section for removing fluid. A stator surrounds the laminations and is spaced away therefrom.

Motor cooling using a liquid cooled rotor

A rotatable anode for an X-ray tube is provided including a hollow rotatable anode wheel having two circular faces. One of the circular faces has a bevelled edge for a target region. A circular baffle is situated concentrically inside the hollow anode wheel. The baffle has means for imparting a tangential velocity to a liquid. The outer perimeter of the circular baffle is spaced away from the interior of the anode wheel. Means for supplying cooling liquid to the central portion of one side of the baffle is provided as well as means for removing cooling liquid from the other side of the baffle. Structural means are provided for rotating the baffle and the anode wheel at the same angular velocity.

X-ray target cooling

Structured boiling surfaces for increasing the critical heat flux of immersed surfaces are disclosed. The structures comprise holes or cavities in the boiling surface which constrain vapor jets to be less than the natural spacing thereof, which satisfy the vapor-liquid flooding criteria and which supply added surface area. A configuration having an arcuate surface in order to facilitate vapor removal therefrom when operated in a downwardly facing direction is disclosed.

Means for increasing the critical heat flux of an immersed surface

A gas distributor for fluidizing a bed of particulate matter which provides for minimum dissipation of particle energy from a particulate-laden gas stream on a distributor surface is disclosed. The gas distributor allows the particulate-laden gas stream to contact the surfaces of the distributor at about 90.degree. or 0.degree. which are angles of impact for low erosion. Opposing particulate-laden gas streams are made to contact each other which removes particle kinetic energy while minimizing erosion before fluidizing the bed of particulate matter. A method to minimize erosion of a gas distributor for fluidizing a bed of particulate matter from a particulate-laden gas stream is also disclosed.

Erosion resistant gas distributor and a method for minimizing erosion

A fluid cooled heat sink is provided for use in cooling high power semiconductor devices. The heat sink includes a body formed of thermally conductive material having internal fluid passageways. Cooling fluid from an external source is passed through the heat sink. The preferred heat sink includes a pair of manifolds and means cooperating with the manifolds to allow selective interconnection of the interior passageways of the heat sink.

Forced vaporization heat sink for semiconductor devices

A plate-type gas distributor for fluidizing a bed of particulate matter is described for use in elevated superficial velocity applications. The distributor comprises an assembly of plates or sheets formed into troughs and into deflector baffles which overlie the edge of adjacent troughs to form modules arranged in longitudinal rows. The troughs and the baffles are spaced in a predetermined manner by joining struts or ribs. A circuitous gas flow path is defined by the slit between each deflector baffle and adjacent troughs. The minimum spacing between adjacent troughs is chosen so that the fluid flow velocity through the trough spacing at design point is equal to or greater than the terminal velocity of the fluidized particles.

Gas distributor for fluidizing beds

A closed loop forced liquid cooling system has provision for continuously separating dissolved gas from the cooling liquid. A gas separator is combined with a liquid-gas interface pressurizer to establish favorable temperature and/or low pressure conditions for preferential gas evolution. By preventing bubble formation in liquids cooling electronic and electrical equipment, dielectric breakdown of the cooling liquid is averted.

Cooling liquid de-gassing system

A hermetically sealed vaporization chamber contains a vaporization cooled transformer to be cooled while dielectrically protected and two phase dielectric fluid comprising a liquid and a vapor. The transformer includes a plurality of cooling ducts extending vertically therethrough. The liquid, which resides at a bottom portion of the chamber and has a liquid level above the bottom of the chamber, is also distributed as a film which coats the top and the wall surfaces of the vertical ducts. A distribution pan with an outer rim is positioned above the transformer for receiving liquid condensate from said condenser. The rim portion of the distribution pan is provided with a plurality of apertures to distribute the liquid condensate uniformly as a film over the wall surfaces of the associated vertical ducts. At least one condensate make-up pump is provided for pumping liquid from the bottom portion of the chamber to the distribution pan.

Vaporization cooled transformer

A liquid-cooled electrical transformer with a disc or flat coil transformer winding conventionally has vertical cooling ducts at both coil edges for upward flow of coolant by natural circulation. Higher winding ratings are obtained by mounting staggered partial flow barrier inserts in the vertical cooling ducts to force a small radial flow of coolant between the individual coils for improved heat transfer without excessively reducing the coolant flow rate.

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Schenectady, NY, United States of America

Fred W Staub