Method for functionally testing turbomachines, and test device therefor

Patent metadata

Field	Value
Publication number	US-9632009-B2
Application number	US-201214001424-A
Country	US
Kind code	B2
Filing date	Feb 22, 2012
Priority date	Feb 24, 2011
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

Functional faults of a turbo-machine are determined by operating the turbo-machine as a test object in a test stand using one or more gas pressure pulses which are not superimposed onto a substantially constant gas flow and detecting dynamic behavior of the test object using measuring devices, a measuring and control system and an evaluation unit.

First claim

The invention claimed is:

1. A method for functional testing of a test object containing a rotatable member, said method comprising the steps of:
(a) providing a test stand having a gas supply line;
(b) positioning the test object in the test stand and connecting the gas supply line to the test object;
(c) commencing with no flow of gas in the gas supply line, delivering a gas pressure pulse through the gas supply line to rotate the rotatable member of the test object, with gas flow in the gas supply line thereafter returning to no flow, and
(d) detecting dynamic behavior of the test object with rotating rotatable member to determine functional faults thereof.

2. The method according to claim 1 , wherein in step (c) gas flow in the gas supply line alternates between no flow of gas and flow of gas for delivering at least two gas pressure pulses through the gas supply line.

3. The method according to claim 2 , wherein two of the at least two gas pressure pulses have differing energy content.

4. The method according to claim 1 , wherein the test stand includes a valve in the gas supply line, and including a step of operating the valve in step (c) to provide at least one gas pressure pulse.

5. The method according to claim 4 , wherein the test stand includes a tank containing pressurized gas, and including a step of feeding said pressurized gas to said gas supply line.

6. The method according to claim 4 , wherein the test stand includes a throttle in the gas supply line, and including a step of operating the throttle to reduce gas flow through the gas supply line.

7. The method according to claim 1 , wherein the test stand includes a measuring and control system, and including the steps of measuring at least one of volume flow, mass flow, temperature and pressure of gas flow in the gas supply line.

8. The method according to claim 1 , wherein the test object includes a gas intake and a gas discharge, and wherein in step (b) the gas supply line is connected to the gas Intake so that the rotatable member in the test object rotates in a normal direction.

9. The method according to claim 8 , wherein the test stand includes a measuring and control system, and including the steps of measuring one of volume flow, mass flow, temperature and pressure of the gas flow at the gas discharge, and forwarding the measured values to the measuring and control system.

10. The method according to claim 8 , wherein the test stand includes a throttle at the gas discharge, and wherein the gas flow from the gas discharge is reduced by the throttle.

11. The method according to claim 1 , wherein the test object includes a gas Intake and a gas discharge, and wherein in step (b) the gas supply line is connected to the gas discharge so that the rotatable member therein rotates in a direction opposite to normal.

12. The method according to claim 11 , wherein the test stand includes a measuring and control system, and including the steps of measuring one of volume flow, mass flow, temperature and pressure of the gas flow at the gas discharge, and forwarding the measured values to the measuring and control system.

13. The method according to claim 11 , wherein the test stand includes a throttle at the gas discharge, and wherein the gas flow from the gas discharge is reduced by the throttle.

14. The method according to claim 1 , wherein the test stand includes a lubricant supply device, and Including a step of supplying lubricant to the test object.

15. The method according to claim 14 , wherein the test stand includes a measuring and control system, and including the steps of measuring at least one of volume flow, mass flow and temperature of the lubricant flow, and forwarding the measured values to the measuring and control system.

16. The method according to claim 1 , wherein the test stand includes a speed sensor or rotation angle sensor, and including a step of detecting rotational characteristics of the rotatable member.

17. The method according to claim 1 , wherein the test stand includes a measuring and control system and an air-borne noise sensor, and including the steps of detecting air-borne noise values generated by the test object when the rotatable member thereof is rotating, and forwarding detected values to the measuring and control system.

18. The method according to claim 1 , wherein the test stand includes a measuring and control system and a structure-borne noise sensor, and including the steps of detecting structure-borne noise in the test object when the rotatable member thereof is rotating, and forwarding detected values to the measuring and control system.

19. The method according to claim 1 , wherein the test object comprises a turbine.

20. The method according to claim 1 , wherein the test object comprises a turbine connected to a compressor by a rotatable shaft.

21. A testing apparatus for determining functional faults in a test object containing a rotatable member, said testing apparatus comprising:
a receptacle for receiving the test object,
source means for providing pressurized gas,
a gas supply line for delivering pressurized gas from said source means to the test object in said receptacle,
valve means for controlling flow of pressurized gas through said gas supply line, such that with the valve means closed and no flow of pressurized gas through the gas supply line, the valve means can be opened and closed to deliver at least one pulse of pressurized gas to the test object, with the flow of pressurized gas through the gas supply line being discontinued after each pulse,
measuring means for detecting physical values related to dynamic behavior of the test object in the receptacle when subjected to the at least one pulse of pressurized gas, and
an evaluation unit for evaluating the detected physical values and determining functional faults.

22. The testing apparatus according to claim 21 , including heating means for heating the pressurized gas in the gas supply line.

23. The testing apparatus according to claim 21 , including a throttle means in said gas supply line.

24. The testing apparatus according to claim 23 , including a gas discharge line for removing gas from a test object in said receptacle.

25. The test apparatus according to claim 24 , including an additional throttle means in the gas discharge line.

26. The testing apparatus according to claim 24 , including a measuring and/or control system for receiving the detected physical values.

27. The testing apparatus according to claim 26 , wherein said measuring means includes a first set of detectors for measuring at least one of volume flow, mass flow, temperature and pressure of gas flow in the gas supply line.

28. The testing apparatus according to claim 27 , wherein said measuring means includes a second set of detectors for measuring at least one of volume flow, mass flow, temperature and pressure of gas flow in the gas discharge line.

29. The testing apparatus according to claim 21 , including a lubricant supply means for delivering lubricant to a test object in said receptacle.

30. The testing apparatus according to claim 29 , including a third set of detectors for measuring volume flow, mass flow, temperature and pressure of lubricant delivered to the test object in said receptacle.

31. Testing apparatus according to claim 21 , wherein

Assignees

• Berger Hartmut
• Avl List Gmbh

Inventors

• Berger Hartmut

Classifications

• G01M15/14 Primary

  Testing gas-turbine engines or jet-propulsion engines · CPC title

• G01M15/09

  by monitoring pressure in fluid ducts, e.g. in lubrication or cooling parts · CPC title