CN111638003A - Method for correcting deviation of gas turbine power measurement after replacement of hydraulic dynamometer - Google Patents
Method for correcting deviation of gas turbine power measurement after replacement of hydraulic dynamometer Download PDFInfo
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- CN111638003A CN111638003A CN202010371430.XA CN202010371430A CN111638003A CN 111638003 A CN111638003 A CN 111638003A CN 202010371430 A CN202010371430 A CN 202010371430A CN 111638003 A CN111638003 A CN 111638003A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
- G01L25/006—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency for measuring work or mechanical power or mechanical efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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Abstract
The invention discloses a method for correcting the deviation of gas turbine power measurement after replacing a hydraulic dynamometer, which corrects the power measurement deviation caused after replacing the hydraulic dynamometer so as to achieve the continuity of power measurement. Converting, correcting and calculating the air inlet and outlet pressure, atmospheric parameters and the external characteristics of an output shaft of the gas turbine by using the real-time power measured by the hydraulic dynamometer to obtain converted power; and performing conversion correction calculation on the air inlet/outlet pressure and atmospheric parameters of the gas turbine by the real-time gas turbine rotating speed corresponding to the real-time power measured by the hydraulic dynamometer to obtain the converted rotating speed. The corresponding folded rotating speeds under the same folded power of the hydraulic dynamometer A and the hydraulic dynamometer B are compared, and the folded rotating speed NA of the hydraulic dynamometer A is usedZFor reference, P is corrected by a coefficientBUntil it is the sameReduced power of NBZAnd NAZSubstantially identical.
Description
Technical Field
The invention belongs to the technical field of gas turbines, and particularly relates to a method for correcting the deviation of power measurement of a gas turbine after replacement of a hydraulic dynamometer.
Background
The gas turbine is used as high-speed rotating power equipment, is widely applied to the aspects of power generation, industrial driving, ship power and the like, and when the gas turbine is tested on a test bed, a hydraulic dynamometer is often adopted for power measurement; because the service life of the hydraulic dynamometer is far shorter than that of the gas turbine, when the hydraulic dynamometer is tested for a long time period of the gas turbine and needs to be maintained, the hydraulic dynamometer needs to be replaced by another hydraulic dynamometer for continuous test, and because the measured power characteristics of different hydraulic dynamometers are different, after the hydraulic dynamometer is replaced, the power measurement of the gas turbine changes, which causes certain influence on the calculation of the heat efficiency of the gas turbine. The invention provides a method for correcting the deviation of the power measurement of a gas turbine after the replacement of a hydraulic dynamometer, which has important significance for the power measurement and the heat efficiency calculation of the gas turbine.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for correcting the deviation of the power measurement of a gas turbine after the replacement of a hydraulic dynamometer, which comprises the following steps:
step one, when the hydraulic dynamometer A participates in the test accompanying of the gas turbine, the real-time power P measured by the hydraulic dynamometer A is measuredAPerforming conversion correction calculation on the air inlet and outlet pressure, atmospheric parameters and output shaft external characteristics of the gas turbine to obtain converted power PAZ。
Step two, the real-time power P measured by the hydraulic dynamometer A in the step oneACorresponding real-time gas turbine speed of NAWill rotate at a real time NAThe gas inlet and outlet pressure and atmospheric parameters of the gas turbine are subjected to folding correction calculation to obtain a folding rotating speed NAZ。
And step three, when the hydraulic dynamometer A does not have the condition of the test accompanying of the test power of the gas turbine, replacing the hydraulic dynamometer with the hydraulic dynamometer B. Real-time power P measured by hydraulic dynamometer BBPerforming conversion correction calculation on the air inlet and outlet pressure, atmospheric parameters and output shaft external characteristics of the gas turbine to obtain converted power PBZ。
Step four, the real-time power P measured by the hydraulic dynamometer B in the step threeBCorresponding real-time gas turbineAt a rotation speed of NBWill rotate at a real time NBThe gas inlet and outlet pressure and atmospheric parameters of the gas turbine are subjected to folding correction calculation to obtain a folding rotating speed NBZ。
Step five, comparing the corresponding folded rotating speeds under the same folded power of the hydraulic dynamometer A and the hydraulic dynamometer B, and using the folded rotating speed NA of the hydraulic dynamometer AZFor reference, P is corrected by a coefficientBUntil N is equal to the same reduced powerBZAnd NAZSubstantially identical.
When the gas turbine is tested for a long time, when the hydraulic dynamometer needs to be maintained, the hydraulic dynamometer needs to be replaced by another hydraulic dynamometer for further test, and due to the fact that the measured power characteristics of different hydraulic dynamometers are different, the power measurement of the gas turbine changes after the hydraulic dynamometer is replaced, and certain influence is caused on the calculation of the heat efficiency of the gas turbine. The invention provides a method for correcting the deviation of the power measurement of a gas turbine after the replacement of a hydraulic dynamometer, which corrects the power measurement deviation caused by the replacement of the hydraulic dynamometer so as to achieve the continuity of the power measurement.
Drawings
FIG. 1 is a flow chart of a method for correcting the deviation of the gas turbine power measurement after the hydraulic dynamometer is replaced according to the present invention;
FIG. 2 is a graph comparing a power measurement corrected to an uncorrected measurement after replacement with hydraulic dynamometer B.
Detailed Description
The technical scheme of the invention is explained in detail as follows:
the background is that a certain gas turbine needs to be tested for 5000 hours, a hydraulic dynamometer A is used for carrying out power measurement accompanying and testing, the hydraulic dynamometer A reaches the service life after the gas turbine is tested for 1000 hours, and then a hydraulic dynamometer B is replaced for accompanying and testing. Under the same rotating speed of the gas turbine, the power measurement of the hydraulic dynamometer B is different from that of the hydraulic dynamometer A greatly.
Note: real time power PAConverting, correcting and calculating the air inlet and outlet pressure, atmospheric parameters and output shaft external characteristics of gas turbine and real-time rotating speed NAIntake and exhaust pressure of gas turbineA method for performing reduction correction calculation on force and atmospheric parameters refers to the ship industry standard of the people's republic of China, namely a thermal performance test data processing method of a ship gas turbine.
Step one, measuring the real-time power P of the hydraulic dynamometer AAPerforming conversion correction calculation on the air inlet and outlet pressure, atmospheric parameters and output shaft external characteristics of the gas turbine to obtain converted power PAZ。
Step two, the real-time power P measured by the hydraulic dynamometer A in the step oneACorresponding real-time gas turbine speed of NAWill rotate at a real time NAThe gas inlet and outlet pressure and atmospheric parameters of the gas turbine are subjected to folding correction calculation to obtain a folding rotating speed NAZ. As shown in fig. 2, when the hydraulic dynamometer a is tested, the reduced power corresponds to the reduced rotation speed diagram.
Step three, after the hydraulic dynamometer is replaced by the power B, the real-time power P measured by the hydraulic dynamometer B is usedBPerforming conversion correction calculation on the air inlet and outlet pressure, atmospheric parameters and output shaft external characteristics of the gas turbine to obtain converted power PBZ。
Step four, the real-time power P measured by the hydraulic dynamometer B in the step threeBCorresponding real-time gas turbine speed of NBWill rotate at a real time NBThe gas inlet and outlet pressure and atmospheric parameters of the gas turbine are subjected to folding correction calculation to obtain a folding rotating speed NBZ. As shown in fig. 2, the hydraulic dynamometer B is a reduced rotation speed diagram corresponding to the reduced power without correction when tested.
Step five, comparing the corresponding folded rotating speeds under the same folded power of the hydraulic dynamometer A and the hydraulic dynamometer B, and using the folded rotating speed NA of the hydraulic dynamometer AZFor reference, P isB0.99 to get N under the same reduced powerBZAnd NAZSubstantially identical as shown in fig. 2.
After the steps are completed, the power measurement of the hydraulic dynamometer B is corrected by taking the hydraulic dynamometer A as a reference, the power measurement of the hydraulic dynamometer B is basically consistent with the power measurement of the hydraulic dynamometer A, and the 1% deviation of the power measurement caused by replacing the hydraulic dynamometer is eliminated.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A method for correcting the deviation of the power measurement of a gas turbine after the replacement of a hydraulic dynamometer is characterized by comprising the following steps:
step one, when the hydraulic dynamometer A participates in the test accompanying of the gas turbine, the real-time power P measured by the hydraulic dynamometer A is measuredAPerforming conversion correction calculation on the air inlet and outlet pressure, atmospheric parameters and output shaft external characteristics of the gas turbine to obtain converted power PAZ；
Step two, the real-time power P measured by the hydraulic dynamometer A in the step oneACorresponding real-time gas turbine speed of NAWill rotate at a real time NAThe gas inlet and outlet pressure and atmospheric parameters of the gas turbine are subjected to folding correction calculation to obtain a folding rotating speed NAZ；
Step three, when the hydraulic dynamometer A does not have the condition of the test accompanying of the test power of the gas turbine, replacing the hydraulic dynamometer with the hydraulic dynamometer B; real-time power P measured by hydraulic dynamometer BBPerforming conversion correction calculation on the air inlet and outlet pressure, atmospheric parameters and output shaft external characteristics of the gas turbine to obtain converted power PBZ；
Step four, the real-time power P measured by the hydraulic dynamometer B in the step threeBCorresponding real-time gas turbine speed of NBWill rotate at a real time NBThe gas inlet and outlet pressure and atmospheric parameters of the gas turbine are subjected to folding correction calculation to obtain a folding rotating speed NBZ；
Step five, the hydraulic dynamometer A and the hydraulic dynamometer B have the same sizeThe corresponding reduced rotating speed is compared under the reduced power, and the reduced rotating speed NA of the hydraulic dynamometer A is usedZFor reference, P is corrected by a coefficientBUntil N is equal to the same reduced powerBZAnd NAZSubstantially identical.
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| CN202010371430.XA CN111638003B (en) | 2020-05-06 | 2020-05-06 | Method for correcting deviation of gas turbine power measurement after replacement of hydraulic dynamometer |
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| CN202010371430.XA CN111638003B (en) | 2020-05-06 | 2020-05-06 | Method for correcting deviation of gas turbine power measurement after replacement of hydraulic dynamometer |
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| CN111638003A true CN111638003A (en) | 2020-09-08 |
| CN111638003B CN111638003B (en) | 2021-10-15 |
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