THERMAL MANAGEMENT OF TURBINE CASING USING VARYING WORKING MEDIUMS

• US 20180306060A1
• Filed: 04/24/2017
• Published: 10/25/2018
• Est. Priority Date: 04/24/2017
• Status: Active Grant

• Current Assignee: Rtx Corporation
• Original Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: RANJAN, RAM
• Granted Patent: US 10,450,892 B2
• Time in Patent Office: Days
• CPC Class Codes: F01D 25/12 Cooling
• CPC Class Codes: F01D 25/14 Casings modified therefor double casings F01D25/26
• CPC Class Codes: F01D 25/24 Casings modified for heating or cooling F01D25/14; Casing parts, e.g. diaphragms, casing fastenings casings for rotary machines or engines in general F16M ; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045
• CPC Class Codes: F02C 7/16 characterised by cooling medium
• CPC Class Codes: F05D 2260/207 using a phase changing mass, e.g. heat absorbing by melting or boiling
• CPC Class Codes: F05D 2260/208 using heat pipes
• CPC Class Codes: F05D 2300/502 Thermal properties
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A turbine casing may comprise a casing body and a first heat pipe disposed in the casing body. The first heat pipe may comprise a first working medium. The first heat pipe may include a first vaporization section and a first condensation section. The first vaporization section may be located forward the first condensation section. A second heat pipe may be disposed in the casing body and may comprise a second working medium different from the first working medium.

Claims

1. A turbine casing, comprising:

a casing body;

a first heat pipe disposed in the casing body and comprising a first working medium, the first heat pipe including a first vaporization section and a first condensation section, wherein the first vaporization section is located forward the first condensation section; and

a second heat pipe disposed in the casing body and comprising a second working medium different from the first working medium.

2. The turbine casing of claim 1, wherein a first boiling point of the first working medium is greater than a second boiling point of the second working medium.

3. The turbine casing of claim 2, wherein the first boiling point is greater than or equal to 900 Kelvin.

4. The turbine casing of claim 3, wherein the first working medium comprises at least one of cesium, sodium, potassium, lithium, calcium, or indium.

5. The turbine casing of claim 3, wherein the second working medium comprises at least one of ethanol, water, mercury, sulfur, or ammonia.

6. The turbine casing of claim 1, wherein at least one of the first heat pipe or the second heat pipe is disposed within a groove formed in at least one of an outer surface of the turbine casing or an inner surface of the turbine casing.

7. The turbine casing of claim 1, further comprising:

a plurality of high temperature heat pipes disposed in the casing body, the plurality of high temperature heat pipes including the first heat pipe; and

a plurality of low temperature heat pipes disposed in the casing body, the plurality of low temperature heat pipes including the second heat pipe, wherein the high temperature heat pipes and the low temperature heat pipes are arranged around a circumference of the turbine casing in an alternating high temperature heat pipe low temperature heat pipe configuration.

8. The turbine casing of claim 1, wherein at least one of the first working medium or the second working medium is in contact with an internal surface of the casing body.

9. The turbine casing of claim 1, wherein the first vaporization section is located in a high pressure turbine region of the casing body and the first condensation section is located in a low pressure turbine region of the casing body.

10. A gas turbine engine, comprising:

a high pressure turbine;

a low pressure turbine aft of the high pressure turbine;

a turbine casing disposed around the high pressure turbine and the low pressure turbine;

a first heat pipe disposed in the turbine casing and comprising a first working medium, the first heat pipe including a first vaporization section radially outward from the high pressure turbine and a first condensation section aft of the first vaporization section; and

a second heat pipe disposed in the turbine casing and comprising a second working medium different from the first working medium.

11. The gas turbine engine of claim 10, wherein a second condensation section of the second heat pipe is radially outward from the low pressure turbine.

12. The gas turbine engine of claim 10, wherein a first boiling point of the first working medium is greater than a second boiling point of the second working medium.

13. The gas turbine engine of claim 12, wherein the first boiling point is 900 Kelvin or greater.

14. The gas turbine engine of claim 10, wherein:

the first working medium comprises at least one of cesium, sodium, potassium, lithium, calcium, or indium; and

the second working medium comprises at least one of ethanol, water, mercury, sulfur, or ammonia.

15. The gas turbine engine of claim 10, wherein the first heat pipe is disposed in a groove formed in at least one of an outer surface of the turbine casing or an inner surface of the turbine casing.

16. The gas turbine engine of claim 10, wherein the first heat pipe is surrounded by the turbine casing.

17. The gas turbine engine of claim 10, wherein an internal surface of the turbine casing contacts the first working medium.

18. The gas turbine engine of claim 10, further comprising:

a plurality of high temperature heat pipes disposed in the turbine casing, the plurality of high temperature heat pipes including the first heat pipe; and

a plurality of low temperature heat pipes disposed in the turbine casing, the plurality of low temperature heat pipes including the second heat pipe, wherein the high temperature heat pipes and the low temperature heat pipes are arranged around a circumference of the turbine casing in an alternating high temperature heat pipe low temperature heat pipe configuration.

19. A method of cooling a turbine casing, comprising,

disposing a first vaporization section of a first heat pipe in a high pressure turbine region of the turbine casing, the first heat pipe comprising a first working medium;

disposing a first condensation section of the first heat pipe aft of the first vaporization section; and

disposing a second heat pipe in the turbine casing, the second heat pipe comprising a second working medium different from the first working medium.

20. The method of claim 19, wherein a first boiling point of the first working medium is greater than a second boiling of the second working medium.