Method and system for evaluating starting exhaust temperature level of gas turbine starter

Abstract

The invention discloses a method for evaluating the starting exhaust temperature level of a gas turbine starter, and belongs to the technical field of aviation gas turbine assistance. Comprising the steps of constructing a starting exhaust temperature correction formula based on exhaust residual temperature before starting and atmospheric temperature and evaluating the engine exhaust temperature level based on the correction formula. The correction formula of the starting exhaust temperature of the gas turbine starter is constructed based on the exhaust residual temperature before starting and the atmospheric temperature, and the exhaust temperature of the gas turbine starter in the target environment is corrected based on the correction formula, so that the starting exhaust temperature levels of different gas turbine starters can be compared under the same standard; and the performance of the gas turbine starter is evaluated, the qualified gas turbine starter with the temperature margin is screened out, and starting overtemperature is prevented.

Description

Technical Field

[0001] This invention belongs to the field of gas turbine auxiliary power technology, specifically relating to a method and system for evaluating the starting exhaust temperature level of a gas turbine starter. Background Technology

[0002] A gas turbine starter is a compact, high-power-to-weight-ratio small gas turbine shaft engine. The shaft power is transmitted to the high-pressure rotor of the main engine after being output by a reducer. The gas turbine starter, which uses a free turbine to output shaft power, operates stably and the free turbine speed changes smoothly, thus achieving reliable and smooth acceleration of the main engine. The gas turbine starter has a large starting power and is widely used in large and medium-sized turbofan engines, fighter jets, drones, and carrier-based aircraft. It needs to adapt to complex working environments, covering high altitudes and high temperature and humidity environments across the entire territory.

[0003] The starting exhaust temperature of a gas turbine starter is affected by factors such as atmospheric conditions, starting fuel supply patterns, and starting intervals (the magnitude of residual exhaust temperature). Generally, a starting exhaust temperature protection value is set to prevent overheating during start-up, while a steady-state exhaust temperature limit value related to the intake air temperature is also set. Gas turbine starters operate for a short time, typically only 1 minute. Their steady-state exhaust temperature limiting strategy is usually formulated by fitting steady-state performance parameters obtained through specialized tests. Under the same control law, the steady-state exhaust temperature of a gas turbine starter is linearly related to the intake air temperature; the higher the intake air temperature, the higher the steady-state exhaust temperature. However, due to differences in installation conditions, some gas turbine starters experience very harsh intake conditions, resulting in high exhaust temperatures during the instantaneous starting process. In hot summer weather, continuous starting can easily lead to overheating during start-up. Summary of the Invention

[0004] The purpose of this invention is to provide a method for evaluating the starting exhaust temperature level of a gas turbine starter, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for evaluating the starting exhaust temperature level of a gas turbine starter, comprising: Construct a starting exhaust temperature correction formula based on pre-start exhaust residual temperature and atmospheric temperature; The exhaust gas residual temperature and atmospheric temperature of the gas turbine starter before starting under a set environment are obtained, and the starting exhaust gas temperature correction value of the gas turbine starter under the target environment is calculated based on the starting exhaust gas temperature correction formula and the exhaust gas residual temperature and atmospheric temperature of the gas turbine starter before starting under the set environment. The exhaust temperature level of the gas turbine starter is evaluated based on the starting exhaust temperature correction value of the gas turbine starter under the target environment.

[0006] Furthermore, the starting exhaust temperature correction formula is as follows:

[0007] In the formula This refers to the peak exhaust temperature during gas turbine starter motor operation. The residual heat of the exhaust gas before starting Atmospheric temperature, The target for correcting atmospheric temperature. The target for correcting exhaust residual temperature before startup. This is a correction factor for atmospheric temperature. This is a correction factor for the residual exhaust temperature before startup.

[0008] Furthermore, the target for atmospheric temperature correction. Correction target for exhaust residual temperature before starting It is designed based on the target environment.

[0009] Furthermore, the correction factor for atmospheric temperature Determined based on the following steps: High-altitude test benches were conducted, and start-up tests were performed under different simulated atmospheric temperatures to obtain start-up exhaust temperature data corresponding to different simulated atmospheric temperatures. Linear fitting was then performed on the simulated atmospheric temperature and start-up exhaust temperature data to obtain a correction coefficient for the atmospheric temperature. .

[0010] Furthermore, in the high-altitude test, the difference between the residual exhaust temperature and the simulated atmospheric temperature before startup was controlled within a specified range.

[0011] Furthermore, the correction factor for exhaust residual temperature before starting. Determined based on the following steps: Intake air heating tests were conducted, including start-up tests at different time intervals under the same simulated atmospheric temperature. This was to obtain start-up exhaust temperature data corresponding to different pre-start exhaust residual temperatures under the same atmospheric temperature. Linear fitting was then performed on the pre-start exhaust residual temperature and start-up exhaust temperature data to obtain a correction coefficient for the pre-start exhaust residual temperature. .

[0012] Furthermore, the correction factor for atmospheric temperature Correction factor for exhaust residual temperature before starting The confirmation also includes a correction factor for the atmospheric temperature obtained from linear fitting based on real-world usage data of the gas turbine starter. Correction factor for exhaust residual temperature before starting Make corrections.

[0013] Furthermore, the exhaust residual temperature and atmospheric temperature before starting of the gas turbine starter are obtained under the set environment conditions, either on the installed machine or on the test bench.

[0014] Another aspect of this application discloses a system for evaluating the starting exhaust temperature level of a gas turbine starter, comprising: The module is configured to use a starting exhaust temperature correction formula based on the pre-start exhaust residual temperature and atmospheric temperature. The correction module is configured to obtain the exhaust residual temperature and atmospheric temperature of the gas turbine starter before starting under a set environment, and calculate the correction value of the gas turbine starter's exhaust temperature under the target environment based on the starting exhaust temperature correction formula and the exhaust residual temperature and atmospheric temperature of the gas turbine starter before starting under the set environment. The evaluation module is configured to evaluate the exhaust temperature level of the gas turbine starter based on the starter exhaust temperature correction value of the gas turbine starter under the target environment.

[0015] Furthermore, the starting exhaust temperature correction formula is as follows:

[0016] In the formula This refers to the peak exhaust temperature during gas turbine starter motor operation. The residual heat of the exhaust gas before starting Atmospheric temperature, The target for correcting atmospheric temperature. The target for correcting exhaust residual temperature before startup. This is a correction factor for atmospheric temperature. This is a correction factor for the residual exhaust temperature before startup.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This application constructs a correction formula for the starting exhaust temperature of a gas turbine starter based on the residual exhaust temperature and atmospheric temperature before starting. Based on this correction formula, the exhaust temperature of the gas turbine starter under the target environment is corrected. This allows for comparison of the starting exhaust temperature levels of different gas turbine starters under the same standard, evaluation of gas turbine starter performance, screening of qualified gas turbine starters with temperature margin, and prevention of overheating during starting. Attached Figure Description

[0018] Figure 1 This is a flowchart of the method in this application; Figure 2 This is a schematic diagram illustrating example starter exhaust temperature correction data; Figure 3 This is a schematic diagram of corrected starter exhaust temperature data for another example. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] A gas turbine starter includes a gas generator unit and a power output unit. The gas generator rotor reaches a steady state 10 seconds before starting. The peak starting exhaust temperature generally occurs before the gas generator rotor enters steady-state operation, when the starting fuel flow and gas generator speed are at their maximum. The starting exhaust temperature is affected by factors such as intake air temperature, starting fuel supply pattern, ignition timing, and power supply. This application constructs an evaluation method for the starting exhaust temperature level of a gas turbine engine based on atmospheric temperature and exhaust residual temperature (different cooling intervals). Specifically, an evaluation method for the starting exhaust temperature level of a gas turbine starter (hereinafter referred to as the evaluation method) is provided, referring to... Figure 1 ,include: S100: Construct a starting exhaust temperature correction formula based on pre-start exhaust residual temperature and atmospheric temperature; S200: Obtain the exhaust residual temperature and atmospheric temperature of the gas turbine starter before starting under a set environment, and calculate the start exhaust temperature correction value of the gas turbine starter under the target environment based on the start exhaust temperature correction formula and the exhaust residual temperature and atmospheric temperature of the gas turbine starter before starting under the set environment. S300: Evaluate the exhaust temperature level of the gas turbine starter based on the starter exhaust temperature correction value of the gas turbine starter under the target environment.

[0021] In some embodiments, the above-mentioned starting exhaust temperature correction formula is as follows: (1) In equation (1), This is the peak temperature of the exhaust gas during startup. The residual heat of the exhaust gas before starting Atmospheric temperature, The target for correcting atmospheric temperature. The target for correcting exhaust residual temperature before startup. This is a correction factor for atmospheric temperature. This is a correction factor for the residual exhaust temperature before startup.

[0022] In some embodiments, the above-mentioned atmospheric temperature correction target Correction target for exhaust residual temperature before starting Based on the target environment, for example, the gas turbine starter needs to function normally in a summer environment, i.e., the target environment is a high-temperature summer environment. For example, the atmospheric temperature is 30°C, and the exhaust residual temperature before starting is 300°C (starting interval is 2 minutes). Correspondingly, the target atmospheric temperature correction is... The target temperature for correcting the exhaust residual temperature before starting is 30°C. The temperature is 300℃.

[0023] In some embodiments, the above-mentioned atmospheric temperature correction factor Correction factor for exhaust residual temperature before starting The confirmation steps are as follows: For the correction factor for atmospheric temperature, a high-altitude test was first conducted, and the simulated atmospheric temperature was varied. This involved performing start-up tests under different atmospheric temperatures, ensuring that the exhaust gas residual temperature before start-up was close to the simulated atmospheric temperature, or that the difference between the exhaust gas residual temperature before start-up and the simulated atmospheric temperature was within a specified range. Start-up exhaust gas temperature data corresponding to different simulated atmospheric temperatures were obtained through the tests. A linear fit was then performed between the simulated atmospheric temperature and the start-up exhaust gas temperature data to obtain the first correction factor for atmospheric temperature. ; To correct the pre-start exhaust residual temperature, a high-altitude test was also conducted. Start-up tests were performed at different intervals under the same simulated atmospheric temperature to obtain start-up exhaust temperature data corresponding to different pre-start exhaust residual temperatures under the same atmospheric temperature. Linear fitting was then performed on the pre-start exhaust residual temperature and start-up exhaust temperature data to obtain the first correction coefficient for the pre-start exhaust residual temperature. .

[0024] In some embodiments, the above-mentioned atmospheric temperature correction factor Correction factor for exhaust residual temperature before starting The confirmation steps are as follows: For the correction factor of atmospheric temperature, an intake heating test is conducted, which involves gradually increasing the inlet air temperature of the gas turbine starter. Before the test, it is confirmed that the exhaust residual temperature before starting is close to the simulated atmospheric temperature, ensuring the difference between the exhaust residual temperature before starting and the simulated atmospheric temperature is within a specified range. Starting exhaust temperature data corresponding to different simulated atmospheric temperatures under heating conditions are obtained, and linear fitting is performed on the simulated atmospheric temperature and starting exhaust temperature data to obtain the second correction factor for atmospheric temperature. .

[0025] To correct the pre-start exhaust residual temperature, starting tests need to be conducted at varying intervals under the same simulated atmospheric temperature and intake heating conditions. Starting exhaust temperature data corresponding to different pre-start exhaust residual temperatures under heating conditions needs to be obtained. The pre-start exhaust residual temperature and starting exhaust temperature data then need to be fitted to obtain a second correction factor for the pre-start exhaust residual temperature. .

[0026] Whether the correction factors for atmospheric temperature and pre-start exhaust residual temperature are obtained based on high-altitude test or intake heating test, considering that the high-altitude test is conducted in a relatively ideal simulation chamber with good heat dissipation, the relationship between exhaust temperature and pre-start exhaust residual temperature is somewhat idealized. Therefore, the first correction factor for atmospheric temperature can be selected. As the first correction factor for atmospheric temperature The intake air heating test mainly focuses on heating the inlet environment of the gas turbine starter, and the relationship between the starting exhaust temperature and the ambient temperature obtained is too ideal. Therefore, the second correction factor of the exhaust residual temperature before starting can be selected. As a correction factor for exhaust residual temperature before starting .

[0027] In some embodiments, to further improve the accuracy of exhaust temperature correction, an atmospheric temperature correction factor is used. Correction factor for exhaust residual temperature before starting The confirmation also includes the correction coefficients obtained from the experimental fitting. Correction factor for exhaust residual temperature before starting To obtain the final correction factor, adjustments are made by substituting actual operating data of the gas turbine starter into the starting exhaust temperature correction formula, and adjusting the atmospheric temperature correction factor in the starting exhaust temperature correction value expression. Correction factor for exhaust residual temperature before starting After fine-tuning, the starting exhaust temperature correction formula is finally obtained.

[0028] In some embodiments, the exhaust residual temperature and atmospheric temperature of the gas turbine starter before starting under a set environment need to be obtained under installed or bench conditions. At the same time, the peak value of the starting exhaust temperature in the above-mentioned starting exhaust temperature correction formula is also constituted as the peak value of the starting exhaust temperature obtained under a set environment (installed or bench conditions).

[0029] In some embodiments, after evaluating the exhaust temperature level of the gas turbine starter based on the starting exhaust temperature correction value of the gas turbine starter under the target environment, qualified and unqualified engine products can be screened out. Unqualified products are treated by adjusting the starting fuel supply or other measures. In other words, starter screening can be carried out first, and adjustments can be made if necessary.

[0030] Figure 2 and Figure 3 Correction results are provided for measured data of different starters at intake air temperatures of (25–100) °C and exhaust residual temperature before starting of (25–300) °C. Figure 2 The dispersion of the mid-start exhaust temperature correction data should not exceed 50℃; Figure 3 The dispersion of the exhaust temperature correction data is no greater than 60℃.

[0031] This application also discloses a system for evaluating the starting exhaust temperature level of a gas turbine starter, including: The module is configured to use a starting exhaust temperature correction formula based on the pre-start exhaust residual temperature and atmospheric temperature. The correction module is configured to obtain the exhaust residual temperature and atmospheric temperature of the gas turbine starter before starting under a set environment, and calculate the correction value of the gas turbine starter's exhaust temperature under the target environment based on the starting exhaust temperature correction formula and the exhaust residual temperature and atmospheric temperature of the gas turbine starter before starting under the set environment. The evaluation module is configured to evaluate the exhaust temperature level of the gas turbine starter based on the starter exhaust temperature correction value of the gas turbine starter under the target environment.

[0032] In some embodiments, the starting exhaust temperature correction formula is as follows:

[0033] In the formula This refers to the peak exhaust temperature during gas turbine starter motor operation. The residual heat of the exhaust gas before starting Atmospheric temperature, The target for correcting atmospheric temperature. The target for correcting exhaust residual temperature before startup. This is a correction factor for atmospheric temperature. This is a correction factor for the residual exhaust temperature before startup.

[0034] In the description of this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this invention, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples and features of different embodiments or examples described in this invention without contradiction.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the starting exhaust temperature level of a gas turbine starter, characterized in that, include: Construct a starting exhaust temperature correction formula based on pre-start exhaust residual temperature and atmospheric temperature; The exhaust gas residual temperature and atmospheric temperature of the gas turbine starter before starting under a set environment are obtained, and the starting exhaust gas temperature correction value of the gas turbine starter under the target environment is calculated based on the starting exhaust gas temperature correction formula and the exhaust gas residual temperature and atmospheric temperature of the gas turbine starter before starting under the set environment. The exhaust temperature level of the gas turbine starter is evaluated based on the starting exhaust temperature correction value of the gas turbine starter under the target environment.

2. The method for evaluating the starting exhaust temperature level of a gas turbine starter according to claim 1, characterized in that: The formula for correcting starting exhaust temperature is as follows: In the formula This refers to the peak exhaust temperature during gas turbine starter motor operation. The residual heat of the exhaust gas before starting Atmospheric temperature, The target for correcting atmospheric temperature. The target for correcting the residual exhaust temperature before startup. This is a correction factor for atmospheric temperature. This is a correction factor for the residual exhaust temperature before startup.

3. The method for evaluating the starting exhaust temperature level of a gas turbine starter according to claim 2, characterized in that: Atmospheric temperature correction target Correction target for exhaust residual temperature before starting It is designed based on the target environment.

4. The method for evaluating the starting exhaust temperature level of a gas turbine starter according to claim 2, characterized in that: Correction factor for atmospheric temperature Determined based on the following steps: High-altitude test benches were conducted, and start-up tests were performed under different simulated atmospheric temperatures to obtain start-up exhaust temperature data corresponding to different simulated atmospheric temperatures. Linear fitting was then performed on the simulated atmospheric temperature and start-up exhaust temperature data to obtain a correction coefficient for the atmospheric temperature. .

5. The method for evaluating the starting exhaust temperature level of a gas turbine starter according to claim 4, characterized in that: In the high-altitude test, the difference between the residual exhaust temperature and the simulated atmospheric temperature before startup is controlled within a specified range.

6. The method for evaluating the starting exhaust temperature level of a gas turbine starter according to claim 4, characterized in that: Correction factor for exhaust residual temperature before starting Determined based on the following steps: Intake air heating tests were conducted, including start-up tests at different time intervals under the same simulated atmospheric temperature. This was to obtain start-up exhaust temperature data corresponding to different pre-start exhaust residual temperatures under the same atmospheric temperature. Linear fitting was then performed on the pre-start exhaust residual temperature and start-up exhaust temperature data to obtain a correction coefficient for the pre-start exhaust residual temperature. .

7. The method for evaluating the starting exhaust temperature level of a gas turbine starter according to claim 6, characterized in that: Correction factor for atmospheric temperature Correction factor for exhaust residual temperature before starting The confirmation also includes a correction factor for the atmospheric temperature obtained from linear fitting based on real-world usage data of the gas turbine starter. Correction factor for exhaust residual temperature before starting Make corrections.

8. The method for evaluating the starting exhaust temperature level of a gas turbine starter according to claim 1, characterized in that: The exhaust residual temperature and atmospheric temperature before starting of the gas turbine starter are obtained under the set environment and under the conditions of installation or test bench.

9. A system for evaluating the starting exhaust temperature level of a gas turbine starter, characterized in that, include: The module is configured to use a starting exhaust temperature correction formula based on the pre-start exhaust residual temperature and atmospheric temperature. The correction module is configured to obtain the exhaust residual temperature and atmospheric temperature of the gas turbine starter before starting under a set environment, and calculate the correction value of the gas turbine starter's exhaust temperature under the target environment based on the starting exhaust temperature correction formula and the exhaust residual temperature and atmospheric temperature of the gas turbine starter before starting under the set environment. The evaluation module is configured to evaluate the exhaust temperature level of the gas turbine starter based on the starter exhaust temperature correction value of the gas turbine starter under the target environment.

10. The method for evaluating the starting exhaust temperature level of a gas turbine starter according to claim 9, characterized in that: The formula for correcting starting exhaust temperature is as follows: In the formula This refers to the peak exhaust temperature during gas turbine starter motor operation. The residual heat of the exhaust gas before starting Atmospheric temperature, The target for correcting atmospheric temperature. The target for correcting the residual exhaust temperature before startup. This is a correction factor for atmospheric temperature. This is a correction factor for the residual exhaust temperature before startup.

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