CN111678704B - Turbofan engine overall performance adjusting method - Google Patents
Turbofan engine overall performance adjusting method Download PDFInfo
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- CN111678704B CN111678704B CN202010470493.0A CN202010470493A CN111678704B CN 111678704 B CN111678704 B CN 111678704B CN 202010470493 A CN202010470493 A CN 202010470493A CN 111678704 B CN111678704 B CN 111678704B
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Abstract
The invention discloses a turbofan engine overall performance adjusting method, which comprises the following steps: s101, when the performance parameters of the engine are unqualified, acquiring a total working flow value of each fuel nozzle group and an exhaust temperature value measured by a temperature detector corresponding to the fuel nozzle group; s102, judging whether the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a linear correlation relationship or not; s103, when the linear correlation exists, acquiring a fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a first target correction nozzle group, and reducing the total working flow value of the first target correction nozzle group; and S104, detecting the engine performance parameters again until the engine performance parameters are qualified. According to the method for adjusting the whole performance of the turbofan engine, the fuel nozzle group is locally decomposed directly on the test bed under the condition that the engine is not placed on the test bed, so that the performance of the engine is improved to meet the requirement of the performance of the engine.
Description
Technical Field
The invention relates to the technical field of aero-engine testing, in particular to a method for adjusting the overall performance of a turbofan engine.
Background
The performance of the whole machine is an important tactical index of the aeroengine. At present, when the performance of an engine is unqualified in testing, the engine is disassembled, reasons are searched and analyzed, troubleshooting measures are made under the condition that the engine is placed on the bench, and then the engine is assembled and trial run to be finally qualified.
In the prior art, when the performance of an engine is unqualified, the adopted troubleshooting process is as follows: the whole machine is disassembled, trouble-shooting and assembled again. For the engine with difficult performance adjustment, parts and parts are required to be repaired or replaced, the area of the guider is required to be matched and adjusted, trial run verification and multiple troubleshooting are required, the implementation period of the whole performance troubleshooting scheme is long, and the damage to engine parts caused by repeated decomposition and assembly is large. Especially for the method of eliminating the engine performance problem by replacing parts with poor performance matching, more engine spare parts need to be provided, which brings great difficulty to production management and spare part supply.
Disclosure of Invention
The method for adjusting the whole performance of the turbofan engine adopts a bench engine performance in-situ adjustment technology to solve the technical problems that the damage to engine parts is large and the troubleshooting period is long due to the fact that the engine needs to be disassembled and reassembled when the performance of the engine is unqualified in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a turbofan engine complete machine performance adjusting method comprises a combustion chamber case and a turbine case which are axially arranged, wherein a fuel nozzle group used for providing atomized fuel for combustion is arranged on the combustion chamber case, a plurality of fuel nozzle groups are arranged along the circumferential direction of the combustion chamber case, a temperature detector which is arranged at the downstream of the fuel nozzle group and used for detecting an exhaust temperature value of the atomized fuel sprayed by the fuel nozzle group after combustion is arranged on the turbine case, the temperature detectors are uniformly arranged along the circumferential interval of the turbine case, and the temperature detectors and the fuel nozzle groups are correspondingly arranged to detect the exhaust temperature value of the fuel nozzle group at the position corresponding to the temperature detector after combustion, and the method comprises the following steps: s101, when the performance parameters of the engine are unqualified, acquiring a total working flow value of each fuel nozzle group and an exhaust temperature value measured by a temperature detector corresponding to the fuel nozzle group; s102, judging whether the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a linear correlation relationship or not according to the total working flow value of each fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group; s103, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detectors corresponding to the fuel nozzle group are in a linear correlation relationship, acquiring the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a first target correction nozzle group according to the exhaust temperature values measured by the temperature detectors, and reducing the total working flow value of the first target correction nozzle group; and S104, detecting the performance parameters of the engine again, judging whether the performance parameters of the engine are qualified, and if the performance parameters of the engine are unqualified, repeating the steps from S101 to S103 until the performance parameters of the engine are qualified.
Further, before step S101, the method further includes: s1051, acquiring the exhaust temperature value measured by each temperature detector; s1052, calculating an average exhaust temperature value of the turbofan engine according to the exhaust temperature value measured by each temperature detector; and S1053, judging whether the average temperature value is larger than a preset threshold value, and judging that the engine performance parameter is unqualified when the average temperature value is larger than the preset threshold value.
Further, step S102 specifically includes: s1021, acquiring a fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a first target correction nozzle group according to the exhaust temperature values measured by the plurality of temperature detectors; s1021, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the relatively larger total work flow value in each fuel nozzle group is relatively higher or not according to the total work flow value of each fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group, and judging that the total work flow value of the fuel nozzle group and the exhaust temperature value measured by the corresponding temperature detector are in linear correlation relation when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the relatively larger total work flow value is relatively higher; and when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower, determining that the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship.
Further, each fuel nozzle group comprises a plurality of working nozzles, all the working nozzles are uniformly distributed along the circumferential interval of the combustion chamber casing, and the step S103 specifically comprises: s1031, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detectors corresponding to the fuel nozzle group are in a linear correlation relationship, according to the exhaust temperature values measured by the plurality of temperature detectors, obtaining the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a first target correction nozzle group, obtaining the working flow value of each working nozzle in the first target correction nozzle group, and according to the working flow value of each working nozzle in the plurality of working nozzles, obtaining the working nozzle with the largest working flow value in the first target correction nozzle group as a first target maintenance nozzle; acquiring a fuel nozzle group corresponding to a temperature detector with the minimum exhaust temperature value as a first target exchange nozzle group according to the exhaust temperature values measured by the temperature detectors, acquiring a working flow value of each working nozzle in the first target exchange nozzle group, and acquiring a working nozzle with the minimum working flow value in the first target exchange nozzle group as a first target exchange nozzle according to the working flow value of each working nozzle in the plurality of working nozzles; s1032 performs a position exchange correction of the first target maintenance nozzle and the first target replacement nozzle to reduce the operating flow value of the first target maintenance nozzle.
Further, after step S1032, the method further includes: s1033, acquiring an exhaust temperature value of the atomized fuel injected by the first target exchange nozzle group after combustion, and judging whether a temperature difference value between the exhaust temperature value corresponding to the exchanged first target exchange nozzle group and the exhaust temperature value corresponding to the first target exchange nozzle group before exchange is within a preset difference value range; s1034, when the temperature difference value is within the preset difference value range, the step S1051 is re-entered.
Further, after step S102, the method further includes: s106, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower or not; and when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower, acquiring the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a second target correction nozzle group, acquiring the fuel nozzle group corresponding to the temperature detector with the smallest exhaust temperature value as a second target exchange nozzle group, and exchanging the positions of the second target correction nozzle group and the second target exchange nozzle group.
Further, step S106 specifically includes: s1061, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower or not; s1062, when the exhaust temperature value measured by the temperature measurer corresponding to the fuel nozzle group with the larger total work flow value is lower, obtaining the work flow value of each work nozzle in the second target correction nozzle group, and obtaining the work nozzle with the largest work flow value in the second target correction nozzle group as a second target maintenance nozzle according to the work flow value of each work nozzle in the plurality of work nozzles; acquiring a fuel nozzle group corresponding to the temperature detector with the minimum exhaust temperature value as a second target exchange nozzle group according to the exhaust temperature values measured by the plurality of temperature detectors, acquiring a working flow value of each working nozzle in the second target exchange nozzle group, and acquiring a working nozzle with the minimum working flow value in the second target exchange nozzle group as a second target exchange nozzle according to the working flow value of each working nozzle in the plurality of working nozzles; s1063, exchanging the positions of the second target replacement nozzle and the second target maintenance nozzle.
Further, after step S102, the method further includes: s107, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total working flow value is higher or not; and when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total working flow value is higher, acquiring the fuel nozzle group corresponding to the temperature detector with the smallest exhaust temperature value as a third target correction nozzle group, correcting the atomization taper angle of the third target correction nozzle group, and improving the atomization performance of the third target correction nozzle group.
Further, step S107 specifically includes: s1071, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total working flow value is higher or not; s1072, when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total work flow value is higher, obtaining the work flow value of each work nozzle in the third target correction nozzle group, and obtaining the work nozzle with the minimum work flow value in the third target correction nozzle group as a third target maintenance nozzle according to the work flow value of each work nozzle in the plurality of work nozzles; s1073, the atomization taper angle of the third target correction nozzle is corrected, and the atomization performance of the third target correction nozzle is improved.
Further, the temperature detector is a thermocouple.
The invention has the following beneficial effects:
the invention relates to a method for adjusting the whole performance of a turbofan engine, which comprises a combustion chamber case and a turbine case which are arranged along the axial direction, wherein a fuel nozzle group for providing atomized fuel for combustion is arranged on the combustion chamber case, a plurality of fuel nozzle groups are arranged along the circumferential direction of the combustion chamber case, a temperature detector which is arranged at the downstream of the fuel nozzle group and is used for detecting the exhaust temperature value of the atomized fuel sprayed by the fuel nozzle group after combustion is arranged on the turbine case, a plurality of temperature detectors are uniformly arranged along the circumferential direction of the turbine case, the temperature detectors and the fuel nozzle groups are correspondingly arranged to detect the exhaust temperature value of the fuel nozzle group corresponding to the temperature detector after combustion, when the performance parameter of the engine is unqualified, according to the change relation between the flow size of the fuel nozzle group of the turbofan engine and the exhaust temperature value after the turbine at the corresponding position, after the working flow total value of the fuel nozzle group and the exhaust temperature value are determined to be in a linear correlation relation, the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value is obtained as a first target correction nozzle group, the fuel nozzle group is directly and locally decomposed on a test run rack under the condition that the engine does not get off the bench, the mounting position of the fuel nozzle group corresponding to the exhaust temperature value is adjusted to be higher, and the total working flow value of the first target correction nozzle group is reduced, so that the exhaust temperature value of the engine is reduced until the performance parameters of the engine are qualified, the performance of the engine is improved to meet the requirements, the parts of the engine do not need to be disassembled, the parts of the engine are protected, and the troubleshooting period is short.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a turbofan engine according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of an assembled structure of a working nozzle according to a preferred embodiment of the present invention;
FIG. 3 is a schematic view showing an assembled structure of a temperature detector according to a preferred embodiment of the present invention;
FIG. 4 is a flow chart of a turbofan engine overall performance tuning method of the preferred embodiment of the present invention;
FIG. 5 is a flow chart of a method for adjusting the overall performance of a turbofan engine according to another preferred embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
FIG. 1 is a schematic structural view of a turbofan engine according to a preferred embodiment of the present invention; FIG. 2 is a schematic view of an assembled structure of a working nozzle according to a preferred embodiment of the present invention; FIG. 3 is a schematic view showing an assembled structure of a temperature detector according to a preferred embodiment of the present invention; FIG. 4 is a flow chart of a turbofan engine overall performance tuning method of the preferred embodiment of the present invention; FIG. 5 is a flow chart of a method for adjusting the overall performance of a turbofan engine according to another preferred embodiment of the present invention.
As shown in fig. 4, a method for adjusting overall performance of a turbofan engine according to an embodiment of the present invention includes a combustion chamber casing and a turbine casing axially disposed, a fuel nozzle set for providing atomized fuel for combustion is disposed on the combustion chamber casing, a plurality of fuel nozzle sets are disposed along a circumferential direction of the combustion chamber casing, a temperature detector disposed at a downstream of the fuel nozzle set and configured to detect an exhaust temperature value of the atomized fuel injected by the fuel nozzle set after combustion is disposed on the turbine casing, the plurality of temperature detectors are uniformly disposed along a circumferential direction of the turbine casing at intervals, and the temperature detectors and the fuel nozzle sets are disposed correspondingly to detect the exhaust temperature value of the atomized fuel of the fuel nozzle set at a position corresponding to the temperature detector after combustion, including the following steps: s101, when the performance parameters of the engine are unqualified, acquiring a total working flow value of each fuel nozzle group and an exhaust temperature value measured by a temperature detector corresponding to the fuel nozzle group; s102, judging whether the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a linear correlation relationship or not according to the total working flow value of each fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group; s103, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detectors corresponding to the fuel nozzle group are in a linear correlation relationship, acquiring the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a first target correction nozzle group according to the exhaust temperature values measured by the temperature detectors, and reducing the total working flow value of the first target correction nozzle group; and S104, detecting the performance parameters of the engine again, judging whether the performance parameters of the engine are qualified, and if the performance parameters of the engine are unqualified, repeating the steps from S101 to S103 until the performance parameters of the engine are qualified.
The invention relates to a method for adjusting the whole performance of a turbofan engine, which comprises a combustion chamber case and a turbine case which are arranged along the axial direction, wherein a fuel nozzle group for providing atomized fuel for combustion is arranged on the combustion chamber case, a plurality of fuel nozzle groups are arranged along the circumferential direction of the combustion chamber case, a temperature detector which is arranged at the downstream of the fuel nozzle group and is used for detecting the exhaust temperature value of the atomized fuel sprayed by the fuel nozzle group after combustion is arranged on the turbine case, a plurality of temperature detectors are uniformly arranged along the circumferential direction of the turbine case, the temperature detectors and the fuel nozzle groups are correspondingly arranged to detect the exhaust temperature value of the fuel nozzle group corresponding to the temperature detector after combustion, when the performance parameter of the engine is unqualified, according to the change relation between the flow size of the fuel nozzle group of the turbofan engine and the exhaust temperature value after the turbine at the corresponding position, after the working flow total value of the fuel nozzle group and the exhaust temperature value are determined to be in a linear correlation relation, the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value is obtained as a first target correction nozzle group, the fuel nozzle group is directly and locally decomposed on a test run rack under the condition that the engine does not get off the bench, the mounting position of the fuel nozzle group corresponding to the exhaust temperature value is adjusted to be higher, and the total working flow value of the first target correction nozzle group is reduced, so that the exhaust temperature value of the engine is reduced until the performance parameters of the engine are qualified, the performance of the engine is improved to meet the requirements, the parts of the engine do not need to be disassembled, the parts of the engine are protected, and the troubleshooting period is short.
The turbofan engine comprises a combustion chamber casing and a turbine casing which are axially arranged, four combustion areas are uniformly divided along the circumferential direction of the combustion chamber casing, four temperature measurement areas are uniformly divided along the circumferential direction of the turbine casing, the temperature measurement areas and the combustion areas are arranged in a one-to-one correspondence mode to detect exhaust temperature values of the combustion areas after fuel combustion, a fuel nozzle group used for providing atomized fuel for combustion is arranged on the combustion chamber casing corresponding to each combustion area, two adjacent fuel nozzle groups on the combustion chamber casing are uniformly arranged along the circumferential distance, a temperature detector used for detecting exhaust temperature values after fuel combustion is arranged on the turbine casing corresponding to each temperature measurement area, the four temperature detectors are uniformly arranged along the circumferential distance, and the temperature detectors and the fuel nozzle groups are correspondingly arranged. Specifically, referring to fig. 1, 2 and 3, in another embodiment of the present invention, a turbofan engine has twelve fuel nozzle groups of the same group, the twelve fuel nozzle groups are within a range of nozzle uniform distribution degree, the twelve fuel nozzle groups of the same group form four nozzle groups, the four nozzle groups are respectively located in four combustion areas, four thermocouples for measuring temperature behind a turbine are installed in a circumferential direction, and the four thermocouples are installed in a circumferential direction in a uniform distribution manner. As the engine is in different test run states, fuel injection and the like, the test result of the whole machine bench shows that the flow of the working nozzle in the fuel process and the temperature value of exhaust gas after the turbine do not necessarily have a linear corresponding relation of position or area. The twelve fuel nozzle groups are in the range of nozzle uniform distribution degree, although the flow is in a certain range, the flow is divided into large and small, the position of the nozzle can be adjusted through the flow difference, the temperature field behind the turbine is changed, and the exhaust temperature value is reduced. The positive value of the nozzle distribution degree is (maximum nozzle flow-average nozzle flow)/average nozzle flow, and the negative value of the nozzle distribution degree is (minimum nozzle flow-average nozzle flow)/average nozzle flow, where the average nozzle flow is the average of 12 nozzle flows.
It can be understood that, in the test and development process, the complex conditions of the change relationship between the flow of the turbofan engine fuel nozzle group and the exhaust temperature value after the turbine at the corresponding position, the internal gas flow field distribution of the engine, the flow loss of the fuel main pipe and the like are mainly divided into three rules: the first rule is as follows: the flow rate of the fuel nozzle group is large, the exhaust temperature is high, the flow rate of the fuel nozzle group is small, the exhaust temperature is low, and at the moment, the flow rate of the fuel nozzle group and the change of the exhaust temperature value of the engine corresponding to the turbine form a linear correlation relationship; therefore, the installation position of the fuel nozzle group is adjusted according to the turbine exhaust temperature value and the flow of the fuel nozzle group in a certain position of the engine; the second rule is as follows: the fuel nozzle group has large flow and low exhaust temperature; the flow of the fuel nozzle group is in a nonlinear correlation with the change of the exhaust temperature value of the engine after the turbine, at the moment, in the installation area with large flow of the fuel nozzle group, the air flow participating in combustion is relatively more, and the combustion is more sufficient, so that when the installation position of the fuel nozzle group is adjusted, the fuel nozzle group with large flow in the high-temperature area after the turbine of the engine and the nozzle with small flow in the low-temperature area are subjected to contraposition exchange; the third rule is as follows: the fuel nozzle group has small flow and high temperature, the flow of the fuel nozzle group and the change of the exhaust temperature value of the engine corresponding to the turbine form a nonlinear correlation relationship, at the moment, the fuel nozzle group has small flow, a spray cone angle is small, the combustion is insufficient, the spray cone angle of the nozzle is enlarged on the premise of not changing the flow of the fuel nozzle group, and the fuel atomization performance is improved.
In the invention, the total working flow value of each fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are judged to be in linear correlation relation or not according to the total working flow value of each fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group; whether the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a linear correlation relationship or not can be judged by comparing the relationship between the total working flow value of each fuel nozzle group in the plurality of fuel nozzle groups and the exhaust temperature value corresponding to the engine and corresponding to the turbine. Specifically, when the total working flow value of the fuel nozzle group is relatively large and the post-turbine exhaust temperature value of the engine is relatively high, the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a linear correlation relationship, optionally, in another embodiment of the present invention, the total working flow value of the first fuel nozzle group is the largest, the total working flow value of the second fuel nozzle group is smaller than the total working flow value of the first fuel nozzle group, the total working flow value of the third fuel nozzle group is smaller than the total working flow value of the first fuel nozzle group, the total working flow value of the fourth fuel nozzle group is smaller than the total working flow value of the third fuel nozzle group, when the first fuel nozzle group corresponds to the post-turbine exhaust temperature value, the second fuel nozzle group corresponds to the next highest post-turbine exhaust temperature value, and the third fuel nozzle group corresponds to the lower post-turbine exhaust temperature value, and when the fourth fuel nozzle group corresponds to the lowest exhaust temperature value after the turbine, the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a linear correlation relationship, otherwise, the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship.
Optionally, in a preferred embodiment of the invention, the temperature detector is a thermocouple.
Further, before step S101, the method further includes: s1051, acquiring the exhaust temperature value measured by each temperature detector; s1052, calculating an average exhaust temperature value of the turbofan engine according to the exhaust temperature value measured by each temperature detector; and S1053, judging whether the average temperature value is larger than a preset threshold value, and judging that the engine performance parameter is unqualified when the average temperature value is larger than the preset threshold value. Optionally, as shown in fig. 2 and 3, four thermocouples are installed behind the turbine of the engine, one thermocouple is respectively installed in each quadrant, and the thermocouples are uniformly distributed along the circumference, so that during test, exhaust temperature values of four points behind the corresponding turbine are sensed and obtained through the four thermocouples; and calculating the average temperature after the turbine according to the obtained four point temperatures, and converting the average temperature by a standard formula to obtain an exhaust temperature value conversion value, wherein the exhaust temperature value conversion value is an index for judging whether the engine test run performance is qualified or not. In the invention, when the preset threshold value is 600 ℃, and the average temperature value is more than 600 ℃, the performance parameters of the engine are judged to be unqualified.
Further, step S102 specifically includes: s1021, acquiring a fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a first target correction nozzle group according to the exhaust temperature values measured by the plurality of temperature detectors; s1021, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the relatively large total work flow value in each fuel nozzle group is relatively high or not according to the total work flow value of each fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group, and S1022, judging that the total work flow value of the fuel nozzle group and the exhaust temperature value measured by the corresponding temperature detector are in linear correlation relation when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the relatively large total work flow value is relatively high; and when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower, determining that the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship. It can be understood that, because four groups of fuel nozzle groups are arranged in the invention, the linear correlation relationship between the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the corresponding temperature detector is judged according to the total working flow value of each fuel nozzle group and the exhaust temperature value measured by the corresponding temperature detector, the engine can obtain the linear correlation relationship only by starting once, and the operation is convenient.
Further, each fuel nozzle group comprises a plurality of working nozzles, all the working nozzles are uniformly distributed along the circumferential interval of the combustion chamber casing, and the step S103 specifically comprises: s1031, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detectors corresponding to the fuel nozzle group are in a linear correlation relationship, according to the exhaust temperature values measured by the plurality of temperature detectors, obtaining the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a first target correction nozzle group, obtaining the working flow value of each working nozzle in the first target correction nozzle group, and according to the working flow value of each working nozzle in the plurality of working nozzles, obtaining the working nozzle with the largest working flow value in the first target correction nozzle group as a first target maintenance nozzle; acquiring a fuel nozzle group corresponding to a temperature detector with the minimum exhaust temperature value as a first target exchange nozzle group according to the exhaust temperature values measured by the temperature detectors, acquiring a working flow value of each working nozzle in the first target exchange nozzle group, and acquiring a working nozzle with the minimum working flow value in the first target exchange nozzle group as a first target exchange nozzle according to the working flow value of each working nozzle in the plurality of working nozzles; s1032 performs a position exchange correction of the first target maintenance nozzle and the first target replacement nozzle to reduce the operating flow value of the first target maintenance nozzle. The position of the first target maintenance nozzle and the position of the first target replacement nozzle are exchanged and corrected to reduce the working flow value of the first target maintenance nozzle, so that a sensitive nozzle influencing the exhaust temperature value can be conveniently and quickly found out under the condition that the engine is not stopped, and the exchange is carried out to adjust the overall performance of the engine.
Further, after step S1032, the method further includes: s1033, acquiring an exhaust temperature value of the atomized fuel injected by the first target exchange nozzle group after combustion, and judging whether a temperature difference value between the exhaust temperature value corresponding to the exchanged first target exchange nozzle group and the exhaust temperature value corresponding to the first target exchange nozzle group before exchange is within a preset difference value range or not; s1034, when the temperature difference value is within the preset difference value range, the step S1051 is re-entered. It is understood that the 4-point average temperature after the turbine is lowered and the engine performance is finally qualified only if the temperature of the region is not greatly affected by the injection and then combustion of the original first target replacement nozzle group after the replacement of the first target replacement nozzle group.
Further, after step S102, the method further includes: s106, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower or not; and when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower, acquiring the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a second target correction nozzle group, acquiring the fuel nozzle group corresponding to the temperature detector with the smallest exhaust temperature value as a second target exchange nozzle group, and exchanging the positions of the second target correction nozzle group and the second target exchange nozzle group.
Further, step S106 specifically includes: s1061, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower or not; s1062, when the exhaust temperature value measured by the temperature measurer corresponding to the fuel nozzle group with the larger total work flow value is lower, obtaining the work flow value of each work nozzle in the second target correction nozzle group, and obtaining the work nozzle with the largest work flow value in the second target correction nozzle group as a second target maintenance nozzle according to the work flow value of each work nozzle in the plurality of work nozzles; acquiring a fuel nozzle group corresponding to the temperature detector with the minimum exhaust temperature value as a second target exchange nozzle group according to the exhaust temperature values measured by the plurality of temperature detectors, acquiring a working flow value of each working nozzle in the second target exchange nozzle group, and acquiring a working nozzle with the minimum working flow value in the second target exchange nozzle group as a second target exchange nozzle according to the working flow value of each working nozzle in the plurality of working nozzles; s1063, exchanging the positions of the second target replacement nozzle and the second target maintenance nozzle. The sensitive nozzle influencing the exhaust temperature of the engine is quickly searched, the sensitive nozzle is replaced and corrected, and the engine is quickly overhauled under the condition that the engine does not leave the platform.
Further, after step S102, the method further includes: s107, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total working flow value is higher or not; and when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total working flow value is higher, acquiring the fuel nozzle group corresponding to the temperature detector with the smallest exhaust temperature value as a third target correction nozzle group, correcting the atomization taper angle of the third target correction nozzle group, and improving the atomization performance of the third target correction nozzle group.
Further, step S107 specifically includes: s1071, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total working flow value is higher or not; s1072, when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total work flow value is higher, obtaining the work flow value of each work nozzle in the third target correction nozzle group, and obtaining the work nozzle with the minimum work flow value in the third target correction nozzle group as a third target maintenance nozzle according to the work flow value of each work nozzle in the plurality of work nozzles; s1073, the atomization taper angle of the third target correction nozzle is corrected, and the atomization performance of the third target correction nozzle is improved. The engine is quickly overhauled under the condition that the engine does not leave the platform by quickly searching the sensitive nozzle influencing the exhaust temperature of the engine and correcting the atomization taper angle of the sensitive nozzle.
Further, detecting the engine performance parameters again, judging whether the engine performance parameters are qualified, if not, repeating the steps from S101 to S107 until the engine performance parameters are qualified.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. 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 (7)
1. A method for adjusting the performance of a turbofan engine,
the turbofan engine comprises a combustion chamber casing and a turbine casing which are axially arranged, wherein a fuel nozzle group used for providing atomized fuel for combustion is arranged on the combustion chamber casing, the fuel nozzle groups are arranged along the circumferential direction of the combustion chamber casing, a temperature detector which is arranged at the downstream of the fuel nozzle group and used for detecting the exhaust temperature value of the atomized fuel sprayed by the fuel nozzle group after combustion is arranged on the turbine casing, the temperature detectors are uniformly arranged along the circumferential direction of the turbine casing at intervals, and the temperature detectors and the fuel nozzle group are correspondingly arranged to detect the exhaust temperature value of the atomized fuel sprayed by the fuel nozzle group at the position corresponding to the temperature detectors after combustion,
the method is characterized by comprising the following steps:
s101, when the performance parameters of the engine are unqualified, acquiring a total working flow value of each fuel nozzle group and an exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group;
s102, judging whether the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a linear correlation relationship or not according to the total working flow value of each fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group;
s103, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detectors corresponding to the fuel nozzle group are in a linear correlation relationship, acquiring the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a first target correction nozzle group according to the exhaust temperature values measured by the temperature detectors, and reducing the total working flow value of the first target correction nozzle group;
s104, detecting the performance parameters of the engine again, judging whether the performance parameters of the engine are qualified, if not, repeating the steps from S101 to S103 until the performance parameters of the engine are qualified;
before step S101, the method further includes:
s1051, acquiring the exhaust temperature value measured by each temperature detector;
s1052, calculating an average exhaust temperature value of the turbofan engine according to the exhaust temperature value measured by each temperature detector;
s1053, judging whether the average temperature value is larger than a preset threshold value, and judging that the engine performance parameter is unqualified when the average temperature value is larger than the preset threshold value;
step S102 specifically includes:
s1021, acquiring the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a first target correction nozzle group according to the exhaust temperature values measured by the temperature detectors;
s1021, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the relatively larger total work flow value in each fuel nozzle group is relatively higher or not according to the total work flow value of each fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group,
s1022, when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total work flow value is higher, determining that the total work flow value of the fuel nozzle group and the exhaust temperature value measured by the corresponding temperature detector are in a linear correlation relationship; when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with a large working flow total value is low, determining that the working flow total value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship;
each fuel nozzle group comprises a plurality of working nozzles, all the working nozzles are uniformly distributed along the circumferential interval of the combustion chamber casing,
step S103 specifically includes:
s1031, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detectors corresponding to the fuel nozzle group are in a linear correlation relationship, according to the exhaust temperature values measured by the temperature detectors, acquiring the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value as a first target correction nozzle group, acquiring the working flow value of each working nozzle in the first target correction nozzle group, and acquiring the working nozzle with the largest working flow value in the first target correction nozzle group as a first target maintenance nozzle according to the working flow value of each working nozzle in the plurality of working nozzles;
acquiring a fuel nozzle group corresponding to the temperature detector with the minimum exhaust temperature value as a first target exchange nozzle group according to the exhaust temperature values measured by the temperature detectors, acquiring a working flow value of each working nozzle in the first target exchange nozzle group, and acquiring a working nozzle with the minimum working flow value in the first target exchange nozzle group as a first target exchange nozzle according to the working flow value of each working nozzle in the plurality of working nozzles;
s1032, performing a position exchange correction between the first target maintenance nozzle and the first target replacement nozzle to reduce a working flow value of the first target maintenance nozzle.
2. The method for adjusting the overall performance of a turbofan engine according to claim 1,
further included after step S1032 is:
s1033, acquiring an exhaust temperature value of the atomized fuel injected by the first target exchange nozzle group after combustion, and judging whether a temperature difference value between the exhaust temperature value corresponding to the exchanged first target exchange nozzle group and the exhaust temperature value corresponding to the first target exchange nozzle group before exchange is within a preset difference value range;
s1034, when the temperature difference value is within a preset difference value range, the step S1051 is re-entered.
3. The method for adjusting the overall performance of a turbofan engine according to claim 1,
after step S102, the method further includes: s106, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower or not; when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower, the fuel nozzle group corresponding to the temperature detector with the largest exhaust temperature value is obtained as a second target correction nozzle group, the fuel nozzle group corresponding to the temperature detector with the smallest exhaust temperature value is obtained as a second target exchange nozzle group, and the second target correction nozzle group and the second target exchange nozzle group are subjected to position exchange.
4. The method for adjusting the overall performance of a turbofan engine according to claim 3,
step S106 specifically includes: s1061, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the larger total working flow value is lower or not;
s1062, when the exhaust temperature value measured by the temperature measurer corresponding to the fuel nozzle group with a large total working flow value is low, obtaining the working flow value of each working nozzle in the second target correction nozzle group, and obtaining the working nozzle with the largest working flow value in the second target correction nozzle group as a second target maintenance nozzle according to the working flow value of each working nozzle in the plurality of working nozzles;
acquiring a fuel nozzle group corresponding to the temperature detector with the minimum exhaust temperature value as a second target exchange nozzle group according to the exhaust temperature values measured by the temperature detectors, acquiring a working flow value of each working nozzle in the second target exchange nozzle group, and acquiring a working nozzle with the minimum working flow value in the second target exchange nozzle group as a second target replacement nozzle according to the working flow value of each working nozzle in the plurality of working nozzles;
s1063, exchanging positions of the second target replacement nozzle and the second target maintenance nozzle.
5. The method for adjusting the overall performance of a turbofan engine according to claim 1,
after step S102, the method further includes: s107, when the total working flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total working flow value is higher or not; and when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total working flow value is higher, acquiring the fuel nozzle group corresponding to the temperature detector with the smallest exhaust temperature value as a third target correction nozzle group, correcting the atomization cone angle of the third target correction nozzle group, and improving the atomization performance of the third target correction nozzle group.
6. The method for adjusting the overall performance of a turbofan engine according to claim 5,
step S107 specifically includes: s1071, when the total work flow value of the fuel nozzle group and the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group are in a nonlinear correlation relationship, judging whether the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with the smaller total work flow value is higher or not;
s1072, when the exhaust temperature value measured by the temperature detector corresponding to the fuel nozzle group with a smaller total work flow value is higher, obtaining the work flow value of each work nozzle in the third target correction nozzle group, and obtaining the work nozzle with the smallest work flow value in the third target correction nozzle group as a third target maintenance nozzle according to the work flow value of each work nozzle in the plurality of work nozzles;
s1073, correcting the atomization taper angle of the third target correction nozzle and improving the atomization performance of the third target correction nozzle.
7. The method for adjusting the overall performance of a turbofan engine according to claim 6,
the temperature detector is a thermocouple.
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