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US 2006/0140763 A1Published application
Cooling arrangement
AssigneeROLLS-ROYCE plc
InventorsMichiel Kopmels, Michael Jago, Keith Sadler, Peter Goodman
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AssigneeROLLS-ROYCE plc
InventorsMichiel Kopmels, Michael Jago, Keith Sadler, Peter Goodman
Estimating the term…
A cooling arrangement 11 is provided in which an incident coolant flow 23 is presented to a passage 14 such that a proportion of that flow is diverted in order to create a standing relative overpressure in a chamber 24 compared to the actual static pressure of the flow 23 in the passage 14. In such circumstances through flow transfer apertures in the walls of the chamber 24 forced coolant flows are presented for impingement upon surfaces 26, 27 and therefore greater heat transfer. Generally, coolant flow is presented to both ends of the chamber 24 in order to create the relative standing overpressure in the chamber 24 relative to the current static pressure presented in the passage 14 through the incident flow 23. In such circumstances through utilising the dynamic rotation or other motion of a component incorporating the arrangement 11a higher relative pressure is achieved for greater force coolant flow 22 projection compared to the incident or actual static pressure of the incident coolant flow 23 in the passage 14.
1 A cooling arrangement for a component of an engine, the arrangement comprising a passage for presenting a coolant flow to a component whereby one end of the passage is provided with coolant flow inlet means and the passage comprises a chamber having coolant flow inlets at either end and flow transfer apertures provided in the wall(s) defining the chamber, the chamber configured to receive coolant flow at the flow inlets whereby in use a dynamic component of the flow in the chamber is lower than that of the passage, resulting in a corresponding increase in static pressure, so that the coolant is able to flow through the flow transfer apertures.
2 An arrangement as claimed in claim 1 wherein coolant flow exiting the flow transfer apertures impinges upon a surface of a component in use to facilitate cooling of that component.
3 An arrangement as claimed in claim 1 wherein the transfer apertures are presented laterally outward from the chamber.
4 An arrangement as claimed in claim 1 wherein the chamber coolant flow inlet presents coolant flow at both ends of the chamber.
5 An arrangement as claimed in claim 1 wherein the passage has a single inlet flow means at one end of the passage.
6 An arrangement as claimed in claim 1 wherein the chamber is positioned within the passage.
7 An arrangement as claimed in claim 1 wherein the chamber is formed by one or more other passages.
8 An arrangement as claimed in claim 1 wherein the passage flow inlet means incorporates a bi-furcated entrance.
9 An arrangement as claimed in claim 1 wherein there are a plurality of chambers within the passage.
10 An arrangement as claimed in claim 1 wherein the flow transfer apertures are distributed along the length of the chamber such that they provide forced directed coolant flow through said flow transfer apertures.
11 An arrangement as claimed in claim 10 wherein the chamber cross-sectional area varies in the flow direction in order to achieve a desirable distribution of static pressure along the chamber.
12 An arrangement as claimed in claim 1 wherein the component is a static component.
13 A cooling arrangement as claimed in claim 1 wherein the component is a dynamic component of a turbine engine.
14 A cooling arrangement as claimed in claim 1 wherein the component is a turbine blade.
15 A turbine engine incorporating a turbine blade as claimed in claim 14.