A method and device for evaluating temperature characteristics of hot end section of turbofan engine

Abstract

This application belongs to the field of engine testing technology, and specifically relates to a method and device for evaluating the temperature characteristics of the hot end section of a turbofan engine. The method includes obtaining a relationship curve between the engine low-pressure converted speed n1R and the engine exhaust temperature T6 at each atmospheric ambient temperature T1; determining a standard relationship curve between the engine low-pressure converted speed and the engine exhaust temperature when the atmospheric ambient temperature is 15°C; and determining a corrected exhaust temperature T from the standard relationship curve. 6R Determine the ambient atmospheric temperature T1 and the engine exhaust temperature T6 from other curves; calculate the correction coefficient k in the temperature correction formula; and calculate the engine exhaust temperature under standard atmospheric conditions using the temperature correction formula. This application obtains the exhaust temperature correction coefficient under different atmospheric temperature conditions, accurately correcting the converted engine exhaust temperature and improving the accuracy of engine performance assessment.

Description

Technical Field

[0001] The present application belongs to the field of engine testing technology, and specifically relates to a method and device for evaluating the temperature characteristics of the hot end section of a turbofan engine. Background Art

[0002] Engine hot-end cross-section temperatures, especially exhaust temperatures, are crucial parameters for evaluating engine performance. To assess engine performance, engine performance parameters recorded during tests under non-standard atmospheric conditions must be converted to standard atmospheric conditions at sea level (engine intake temperature T1 = 15°C, intake pressure P1 = 101.325 kPa). This involves performing a non-standard weather performance correction. Therefore, the non-standard weather correction method for exhaust temperatures plays a crucial role in accurately evaluating engine performance.

[0003] At present, without considering the influence of specific heat change and assuming that the engine geometry is similar, the engine exhaust temperature correction method derived by simulation calculation or similarity principle is shown in the temperature correction formula:

[0004]

[0005] Where k is the non-standard atmospheric correction coefficient for exhaust temperature, and the current method uses k=1. 6R The exhaust temperature is corrected to the standard atmospheric conditions at sea level, and T6 is the exhaust temperature under the current test conditions.

[0006] Without considering the influence of specific heat changes and assuming that the engine geometry is similar, the k value in the temperature correction formula should be 1. However, under different atmospheric temperatures, the engine's geometric similarity cannot be strictly maintained, and the engine characteristics will shift. At this time, using k = 1 can no longer accurately reflect the engine's converted exhaust temperature, which will cause a large error in the accuracy of the engine performance assessment. Summary of the Invention

[0007] In order to solve one of the above problems, the present application provides a method and device for evaluating the temperature characteristics of the hot end section of a turbofan engine. Through special experiments and data analysis methods, the exhaust temperature correction coefficient under different atmospheric temperature conditions can be obtained to accurately correct the converted exhaust temperature of the engine and improve the accuracy of evaluating engine performance.

[0008] The first aspect of the present application provides a method for evaluating the temperature characteristics of the hot end section of a turbofan engine, mainly comprising:

[0009] Step S1, based on various engine performance tests at a plurality of preset atmospheric ambient temperatures, obtaining a relationship curve between the engine low-pressure converted speed n1R and the engine exhaust temperature T6 at each atmospheric ambient temperature T1;

[0010] Step S2: determining two atmospheric ambient temperatures closest to the atmospheric ambient temperature of 15° C. and located on both sides of the temperature value, and determining two relationship curves corresponding to the two atmospheric ambient temperatures;

[0011] Step S3: fitting a standard relationship curve between the engine low-pressure converted speed and the engine exhaust temperature when the ambient temperature is 15° C. based on the two relationship curves;

[0012] Step S4: arbitrarily select an engine low-pressure conversion speed, determine the engine exhaust temperature in the standard relationship curve, and use it as the corrected exhaust temperature T 6R ;

[0013] Step S5, for the selected engine low-pressure converted speed, determine the atmospheric environment temperature T1 and the engine exhaust temperature T6 in each relationship curve in step S1;

[0014] Step S6: for each atmospheric environment temperature T1, based on the corrected exhaust temperature T in step S4 6R Calculate the correction coefficient k in the temperature correction formula using the engine exhaust temperature T6 in step S5, thereby determining a set of corresponding relationships between the atmospheric environment temperature T1 and the correction coefficient k, wherein each atmospheric environment temperature T1 corresponds to a correction coefficient k;

[0015] Step S7: Calculate the engine exhaust temperature under standard atmospheric conditions using the temperature correction formula based on the current atmospheric ambient temperature and the engine exhaust temperature obtained during the test run, and the correction coefficient k corresponding to the current atmospheric ambient temperature.

[0016] Preferably, step S1 further comprises:

[0017] From low temperature to high temperature, an atmospheric environment temperature is selected at every set interval, thereby determining multiple preset atmospheric environment temperatures.

[0018] Preferably, the set interval is 3-5°C.

[0019] Preferably, step S6 further includes:

[0020] Step S61: Select multiple low-pressure converted engine speeds, and for each low-pressure converted engine speed, determine a set of corresponding relationships between the atmospheric ambient temperature T1 and the correction coefficient k according to the method of steps S4 and S6;

[0021] Step S62: Correct the correction coefficient k corresponding to the atmospheric environment temperature T1 calculated in step S6 by using the multiple correction coefficients k under the newly calculated atmospheric environment temperature T1.

[0022] Preferably, correcting the correction coefficient k includes determining a final correction coefficient corresponding to each atmospheric ambient temperature by curve fitting, or taking the arithmetic mean of all correction coefficients at each atmospheric ambient temperature as the final correction coefficient corresponding to the atmospheric ambient temperature.

[0023] The second aspect of the present application provides a device for evaluating the temperature characteristics of the hot end section of a turbofan engine, which mainly includes:

[0024] a test data acquisition module for acquiring, based on various engine performance tests at a plurality of preset atmospheric ambient temperatures, a relationship curve between the engine low-pressure converted speed n1R and the engine exhaust temperature T6 at each atmospheric ambient temperature T1;

[0025] The relationship curve selection module is used to determine the two atmospheric ambient temperatures closest to the atmospheric ambient temperature of 15°C and located on both sides of the temperature value, and determine the two relationship curves corresponding to the two atmospheric ambient temperatures;

[0026] A standard relationship curve fitting module is used to fit a standard relationship curve between the engine low-pressure converted speed and the engine exhaust temperature when the atmospheric ambient temperature is 15°C based on the above two relationship curves;

[0027] The output parameter determination module is used to arbitrarily select an engine low-pressure conversion speed, determine the engine exhaust temperature in the standard relationship curve, and use it as the corrected exhaust temperature T 6R ;

[0028] an input parameter determination module for determining, for the selected engine low-pressure converted speed, the atmospheric ambient temperature T1 and the engine exhaust temperature T6 in each relationship curve obtained by the test data acquisition module;

[0029] The correction coefficient calculation module is used to calculate the corrected exhaust temperature T for each atmospheric environment temperature T1 based on the output parameter determination module. 6R Calculating the correction coefficient k in the temperature correction formula using the engine exhaust temperature T6 determined by the input parameter determination module, thereby determining a set of corresponding relationships between the atmospheric environment temperature T1 and the correction coefficient k, wherein each atmospheric environment temperature T1 corresponds to a correction coefficient k;

[0030] The conversion module is used to calculate the engine exhaust temperature under standard atmospheric conditions through the temperature correction formula based on the current atmospheric environment temperature and engine exhaust temperature obtained during the test and the correction coefficient k corresponding to the current atmospheric environment temperature.

[0031] Preferably, the test data acquisition module further includes:

[0032] The temperature selection unit is used to select an atmospheric environment temperature at set intervals from low temperature to high temperature, thereby determining multiple preset atmospheric environment temperatures.

[0033] Preferably, the set interval is 3-5°C.

[0034] Preferably, the device for evaluating the temperature characteristics of the hot end section of the turbofan engine further comprises:

[0035] The correction coefficient correction module is used to select multiple engine low-pressure converted speeds, and for each engine low-pressure converted speed, determine a set of corresponding relationships between the atmospheric ambient temperature T1 and the correction coefficient k according to the method of step S4 and step S6; and correct the correction coefficient k corresponding to the atmospheric ambient temperature T1 calculated by the correction coefficient calculation module using the multiple correction coefficients k under the newly calculated atmospheric ambient temperature T1.

[0036] Preferably, the correction coefficient correction module includes:

[0037] A fitting unit, used to determine the final correction coefficient corresponding to each atmospheric ambient temperature through curve fitting;

[0038] The arithmetic mean calculation unit is used to take the arithmetic mean of all correction coefficients at each atmospheric ambient temperature as the final correction coefficient corresponding to the atmospheric ambient temperature.

[0039] The present application obtains the exhaust temperature correction coefficient under different atmospheric temperature conditions, which can accurately correct the converted exhaust temperature of the engine and improve the accuracy of evaluating engine performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of a preferred embodiment of the method for evaluating the temperature characteristics of the hot end section of a turbofan engine according to the present application.

[0041] Figure 2 It is a comparison diagram of the engine low-pressure converted speed and the engine exhaust temperature at different atmospheric temperatures. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the implementation of this application will be described in more detail below in conjunction with the drawings in the implementation of this application. In the drawings, the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and should not be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in conjunction with the drawings.

[0043] The first aspect of the present application provides a method for evaluating the temperature characteristics of the hot end section of a turbofan engine, such as Figure 1 As shown, it mainly includes:

[0044] Step S1 : Based on various engine performance tests at a plurality of preset atmospheric ambient temperatures, a relationship curve between the engine low-pressure converted speed n1R and the engine exhaust temperature T6 at each atmospheric ambient temperature T1 is obtained.

[0045] In some optional embodiments, step S1 further includes: from low temperature to high temperature, an atmospheric environment temperature is selected at every set interval, thereby determining a plurality of preset atmospheric environment temperatures. In some optional embodiments, the set interval is 3 to 5°C. It should also be noted that when conducting an engine performance test, it is necessary to select an engine, under the condition that its host state, control plan and geometric adjustment rules remain unchanged, that is, no disassembly and assembly is performed. As mentioned above, from low temperature to high temperature, an atmospheric temperature environment is selected at every interval of 3 to 5°C, and the engine performance is recorded on the same whole machine test bench, and the test procedure and test data collection method are consistent. Thereby, a comparison chart of engine n1R and T6 at different atmospheric temperatures can be obtained, such as Figure 2 shown.

[0046] Step S2: Determine two atmospheric ambient temperatures that are closest to the atmospheric ambient temperature of 15° C. and are located on both sides of the temperature value, and determine two relationship curves corresponding to the two atmospheric ambient temperatures.

[0047] refer to Figure 2 Among the two temperatures closest to 15℃, the one below 15℃ is 13.72℃ and the one above 15℃ is 18.4℃.

[0048] Step S3: fitting a standard relationship curve between the engine low-pressure converted speed and the engine exhaust temperature when the atmospheric ambient temperature is 15° C. based on the above two relationship curves.

[0049] exist Figure 2 In the figure, the two curves of 13.72℃ and 18.4℃ are selected and then fitted to obtain the curve at 15℃, which is the standard relationship curve.

[0050] Step S4: arbitrarily select an engine low-pressure conversion speed, determine the engine exhaust temperature in the standard relationship curve, and use it as the corrected exhaust temperature T 6R .

[0051] Step S5: For the selected engine low-pressure converted speed, determine the atmospheric environment temperature T1 and the engine exhaust temperature T6 in each relationship curve in step S1.

[0052] It is understandable that one of the purposes of this application is to calculate the correction coefficient k. Referring to the temperature correction formula in the background art, step S4 is actually to determine the output value of the temperature correction formula (the parameter T on the right side of the equal sign). 6R ), step S5 is actually to determine the input values of the temperature correction formula (parameters T1 and T6 on the left side of the equal sign).

[0053] Step S6: for each atmospheric environment temperature T1, based on the corrected exhaust temperature T in step S4 6R The correction coefficient k in the temperature correction formula is calculated with the engine exhaust temperature T6 in step S5, thereby determining a set of corresponding relationships between the atmospheric environment temperature T1 and the correction coefficient k, in which each atmospheric environment temperature T1 corresponds to a correction coefficient k.

[0054] Based on the output value given in step S4 and the input value given in step S5, the correction coefficient k corresponding to each atmospheric environment temperature T1 can be determined by substituting it into the temperature correction formula, as shown in Table 1 below.

[0055] Table 1 Exhaust temperature non-standard atmospheric correction coefficient (k value)

[0056] <![CDATA[T1(℃)]]> k -20 k1 -15 k2 -10 k3 -5 k4 0 k5 5 k6 10 k7 15 k8 20 k9 25 k10 30 k11

[0057] Step S7: Calculate the engine exhaust temperature under standard atmospheric conditions using the temperature correction formula based on the current atmospheric ambient temperature and the engine exhaust temperature obtained during the test run, and the correction coefficient k corresponding to the current atmospheric ambient temperature.

[0058] With Table 1, the corresponding correction factor k can be found for the test run's ambient temperature. This allows the engine exhaust temperature under standard atmospheric conditions to be calculated using the temperature correction formula and the engine exhaust temperature margin to be assessed. It should be understood that if the ambient temperature determined during the test run is not listed in Table 1, the corresponding correction factor k can be determined through interpolation.

[0059] In some optional implementations, step S6 further includes:

[0060] Step S61: Select multiple engine low-pressure converted speeds, and for each engine low-pressure converted speed, determine a set of corresponding relationships between the atmospheric ambient temperature T1 and the correction coefficient k according to the methods of steps S4 and S6; Step S62: Correct the correction coefficient k corresponding to the atmospheric ambient temperature T1 calculated in step S6 using the multiple correction coefficients k under the newly calculated atmospheric ambient temperature T1.

[0061] It will be appreciated that in step S4, the parameters of Table 1 can be determined by selecting only one arbitrarily selected engine low-pressure converted speed. Different selected engine low-pressure converted speeds may result in different parameters in Table 1. Therefore, this embodiment selects multiple engine low-pressure converted speeds to calculate multiple parameters similar to Table 1, and then corrects the original parameters in Table 1 based on the newly calculated parameters in Table 1. Correction methods include fitting correction or arithmetic mean correction. Specifically, correcting the correction coefficient k includes determining the final correction coefficient corresponding to each ambient temperature through curve fitting, or taking the arithmetic mean of all correction coefficients at each ambient temperature as the final correction coefficient corresponding to that ambient temperature.

[0062] A second aspect of the present application provides a device for evaluating the temperature characteristics of a hot end section of a turbofan engine corresponding to the above method, mainly comprising:

[0063] a test data acquisition module for acquiring, based on various engine performance tests at a plurality of preset atmospheric ambient temperatures, a relationship curve between the engine low-pressure converted speed n1R and the engine exhaust temperature T6 at each atmospheric ambient temperature T1;

[0064] The relationship curve selection module is used to determine the two atmospheric ambient temperatures closest to the atmospheric ambient temperature of 15°C and located on both sides of the temperature value, and determine the two relationship curves corresponding to the two atmospheric ambient temperatures;

[0065] A standard relationship curve fitting module is used to fit a standard relationship curve between the engine low-pressure converted speed and the engine exhaust temperature when the atmospheric ambient temperature is 15°C based on the above two relationship curves;

[0066] The output parameter determination module is used to arbitrarily select an engine low-pressure conversion speed, determine the engine exhaust temperature in the standard relationship curve, and use it as the corrected exhaust temperature T 6R ;

[0067] an input parameter determination module for determining, for the selected engine low-pressure converted speed, the atmospheric ambient temperature T1 and the engine exhaust temperature T6 in each relationship curve obtained by the test data acquisition module;

[0068] The correction coefficient calculation module is used to calculate the corrected exhaust temperature T for each atmospheric environment temperature T1 based on the output parameter determination module. 6R Calculating the correction coefficient k in the temperature correction formula using the engine exhaust temperature T6 determined by the input parameter determination module, thereby determining a set of corresponding relationships between the atmospheric environment temperature T1 and the correction coefficient k, wherein each atmospheric environment temperature T1 corresponds to a correction coefficient k;

[0069] The conversion module is used to calculate the engine exhaust temperature under standard atmospheric conditions through the temperature correction formula based on the current atmospheric environment temperature and engine exhaust temperature obtained during the test and the correction coefficient k corresponding to the current atmospheric environment temperature.

[0070] In some optional embodiments, the test data acquisition module further includes:

[0071] The temperature selection unit is used to select an atmospheric environment temperature at set intervals from low temperature to high temperature, thereby determining multiple preset atmospheric environment temperatures.

[0072] In some optional embodiments, the set interval is 3-5°C.

[0073] In some optional embodiments, the device for evaluating the temperature characteristics of the hot end section of the turbofan engine further includes:

[0074] The correction coefficient correction module is used to select multiple engine low-pressure converted speeds, and for each engine low-pressure converted speed, determine a set of corresponding relationships between the atmospheric ambient temperature T1 and the correction coefficient k according to the method of step S4 and step S6; and correct the correction coefficient k corresponding to the atmospheric ambient temperature T1 calculated by the correction coefficient calculation module using the multiple correction coefficients k under the newly calculated atmospheric ambient temperature T1.

[0075] In some optional implementations, the correction coefficient correction module includes:

[0076] A fitting unit, used to determine the final correction coefficient corresponding to each atmospheric ambient temperature through curve fitting;

[0077] The arithmetic mean calculation unit is used to take the arithmetic mean of all correction coefficients at each atmospheric ambient temperature as the final correction coefficient corresponding to the atmospheric ambient temperature.

[0078] The present application obtains the exhaust temperature correction coefficient under different atmospheric temperature conditions, which can accurately correct the converted exhaust temperature of the engine and improve the accuracy of evaluating engine performance.

[0079] Although the present application has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made based on the present application. Therefore, such modifications or improvements, which do not depart from the spirit of the present application, are within the scope of protection claimed in the present application.

Claims

1. A method for evaluating the temperature characteristics of the hot end section of a turbofan engine, characterized in that: include: Step S1, based on various engine performance tests at a plurality of preset atmospheric ambient temperatures, obtaining a relationship curve between the engine low-pressure converted speed n1R and the engine exhaust temperature T6 at each atmospheric ambient temperature T1; Step S2: determining two atmospheric ambient temperatures closest to the atmospheric ambient temperature of 15° C. and located on both sides of the temperature value, and determining two relationship curves corresponding to the two atmospheric ambient temperatures; Step S3: fitting a standard relationship curve between the engine low-pressure converted speed and the engine exhaust temperature when the ambient temperature is 15° C. based on the two relationship curves; Step S4: arbitrarily select an engine low-pressure conversion speed, determine the engine exhaust temperature in the standard relationship curve, and use it as the corrected exhaust temperature T 6R ; Step S5, for the selected engine low-pressure converted speed, determine the atmospheric environment temperature T1 and the engine exhaust temperature T6 in each relationship curve in step S1; Step S6: for each atmospheric environment temperature T1, based on the corrected exhaust temperature T in step S4 6R Calculate the correction coefficient k in the temperature correction formula using the engine exhaust temperature T6 in step S5, thereby determining a set of corresponding relationships between the atmospheric environment temperature T1 and the correction coefficient k, wherein each atmospheric environment temperature T1 corresponds to a correction coefficient k; Step S7: Calculate the engine exhaust temperature under standard atmospheric conditions using the temperature correction formula based on the current atmospheric ambient temperature and the engine exhaust temperature obtained during the test run, and the correction coefficient k corresponding to the current atmospheric ambient temperature.

2. The method for evaluating the temperature characteristics of the hot end section of a turbofan engine according to claim 1, wherein: Step S1 further comprises: From low temperature to high temperature, an atmospheric environment temperature is selected at every set interval, thereby determining multiple preset atmospheric environment temperatures.

3. The method for evaluating the temperature characteristics of the hot end section of a turbofan engine according to claim 2, wherein: The setting interval is 3 to 5°C.

4. The method for evaluating the temperature characteristics of the hot end section of a turbofan engine according to claim 1, wherein: After step S6, the method further comprises: Step S61: Select multiple low-pressure converted engine speeds, and for each low-pressure converted engine speed, determine a set of corresponding relationships between the atmospheric ambient temperature T1 and the correction coefficient k according to the method of steps S4 and S6; Step S62: Correct the correction coefficient k corresponding to the atmospheric environment temperature T1 calculated in step S6 by using the multiple correction coefficients k under the newly calculated atmospheric environment temperature T1.

5. The method for evaluating the temperature characteristics of the hot end section of a turbofan engine according to claim 4, wherein: Correcting the correction coefficient k includes determining a final correction coefficient corresponding to each atmospheric ambient temperature by curve fitting, or taking the arithmetic mean of all correction coefficients at each atmospheric ambient temperature as the final correction coefficient corresponding to the atmospheric ambient temperature.

6. A device for evaluating the temperature characteristics of the hot end section of a turbofan engine, characterized in that: include: a test data acquisition module for acquiring, based on various engine performance tests at a plurality of preset atmospheric ambient temperatures, a relationship curve between the engine low-pressure converted speed n1R and the engine exhaust temperature T6 at each atmospheric ambient temperature T1; The relationship curve selection module is used to determine the two atmospheric ambient temperatures closest to the atmospheric ambient temperature of 15°C and located on both sides of the temperature value, and determine the two relationship curves corresponding to the two atmospheric ambient temperatures; A standard relationship curve fitting module is used to fit a standard relationship curve between the engine low-pressure converted speed and the engine exhaust temperature when the atmospheric ambient temperature is 15°C based on the above two relationship curves; The output parameter determination module is used to arbitrarily select an engine low-pressure conversion speed, determine the engine exhaust temperature in the standard relationship curve, and use it as the corrected exhaust temperature T 6R ; an input parameter determination module for determining, for the selected engine low-pressure converted speed, the atmospheric ambient temperature T1 and the engine exhaust temperature T6 in each relationship curve obtained by the test data acquisition module; The correction coefficient calculation module is used to calculate the corrected exhaust temperature T for each atmospheric environment temperature T1 based on the output parameter determination module. 6R Calculating the correction coefficient k in the temperature correction formula using the engine exhaust temperature T6 determined by the input parameter determination module, thereby determining a set of corresponding relationships between the atmospheric environment temperature T1 and the correction coefficient k, wherein each atmospheric environment temperature T1 corresponds to a correction coefficient k; The conversion module is used to calculate the engine exhaust temperature under standard atmospheric conditions through the temperature correction formula based on the current atmospheric environment temperature and engine exhaust temperature obtained during the test and the correction coefficient k corresponding to the current atmospheric environment temperature.

7. The device for evaluating the temperature characteristics of the hot end section of a turbofan engine according to claim 6, characterized in that: The test data acquisition module further includes: The temperature selection unit is used to select an atmospheric environment temperature at set intervals from low temperature to high temperature, thereby determining multiple preset atmospheric environment temperatures.

8. The device for evaluating the temperature characteristics of the hot end section of a turbofan engine according to claim 7, characterized in that: The setting interval is 3 to 5°C.

9. The device for evaluating the temperature characteristics of the hot end section of a turbofan engine according to claim 6, characterized in that: The device for evaluating the temperature characteristics of the hot end section of the turbofan engine also includes: The correction coefficient correction module is used to select multiple engine low-pressure converted speeds, and for each engine low-pressure converted speed, determine a set of corresponding relationships between the atmospheric ambient temperature T1 and the correction coefficient k according to the method of step S4 and step S6; and correct the correction coefficient k corresponding to the atmospheric ambient temperature T1 calculated by the correction coefficient calculation module using the multiple correction coefficients k under the newly calculated atmospheric ambient temperature T1.

10. The device for evaluating the temperature characteristics of the hot end section of a turbofan engine according to claim 9, characterized in that: The correction coefficient correction module includes: A fitting unit, used to determine the final correction coefficient corresponding to each atmospheric ambient temperature through curve fitting; The arithmetic mean calculation unit is used to take the arithmetic mean of all correction coefficients at each atmospheric ambient temperature as the final correction coefficient corresponding to the atmospheric ambient temperature.

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