Gas compressor surge detection method and system and medium

Abstract

The invention aims at providing a gas compressor surge detection method and system and a medium. The gas compressor surge detection method comprises the steps that a, dynamic pressure signals of a plurality of positions of a gas compressor along the way are collected; and b, the multiple dynamic pressure signals are compared with dynamic pressure change threshold values under the corresponding working conditions, and if at least one dynamic pressure signal is larger than the dynamic pressure change threshold value, it is judged that surge happens to the gas compressor. Through the gas compressor surge detection method, the reliability of gas compressor surge detection can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine engine detection, and in particular to a compressor surge detection method, a detection system and a medium. Background Art

[0002] The core components of a typical civil turbofan aircraft engine include a high-pressure compressor, which usually contains multiple rows of rotor and stator blades. The engine is very likely to experience a surge failure mode during abnormal use. When the engine surges, the airflow oscillates axially inside the high-pressure compressor, and the flow field deteriorates sharply, resulting in performance degradation. In even worse cases, the blades may break or fly off, and even cause the aircraft to be destroyed and people to die.

[0003] At present, the existing surge detection method is realized by a sensor arranged at the outlet of the high-pressure compressor, and the pressure signal is collected by the sensor, and then the calculation is performed according to a certain logic to realize the identification of the surge fault. Among the existing compressor surge detection methods, there is a method of performing Fourier transformation on the collected pressure signal to obtain the power spectrum within the analysis window for calculation.

[0004] However, the inventors have discovered that the existing surge detection methods still have the problem of low reliability. Summary of the invention

[0005] The object of the present invention is to provide a compressor surge detection method, which can improve the reliability of compressor surge detection.

[0006] A compressor surge detection method for achieving the above-mentioned purpose comprises:

[0007] a. Collect dynamic pressure signals at multiple locations along the compressor;

[0008] b. respectively comparing the multiple dynamic pressure signals with the dynamic pressure change threshold under the corresponding working conditions, and if at least one of the dynamic pressure signals is greater than the dynamic pressure change threshold, determining that the compressor is surging.

[0009] In one or more embodiments, the plurality of locations includes:

[0010] Compressor outlet cross section; and / or

[0011] Inlet cross section of a multi-stage compressor.

[0012] In one or more embodiments, the plurality of positions include a compressor outlet cross section and an inlet cross section of each compressor stage.

[0013] In one or more embodiments, in step a, the sampling rate of the dynamic pressure signal is greater than 100 times the maximum passing frequency of the compressor.

[0014] In one or more embodiments, in step b, the dynamic pressure change threshold under the corresponding working condition is obtained by the following steps:

[0015] Obtain the minimum value of the dynamic pressure amplitude when the compressor surges under the corresponding working conditions, and obtain the average value of the steady-state pressure at that moment;

[0016] The dynamic pressure change threshold value under the corresponding working condition is obtained by dividing the minimum dynamic pressure amplitude by the average steady-state pressure.

[0017] In one or more embodiments, dynamic pressure is collected under the corresponding working condition, and the dynamic pressure collection result is subjected to Fourier transformation to obtain frequency spectrum diagrams of multiple positions under the corresponding working condition, and the minimum dynamic pressure amplitude under the corresponding working condition and the corresponding steady-state pressure average value are obtained according to the frequency spectrum diagram.

[0018] In one or more embodiments, dynamic pressure change thresholds corresponding to multiple different working conditions are obtained, and a fitting curve is fitted according to the multiple working conditions and the corresponding dynamic pressure change thresholds, and the dynamic pressure change thresholds corresponding to the working conditions under different working conditions are obtained according to the fitting curve.

[0019] In one or more embodiments, the plurality of locations includes:

[0020] Specify the stage outlet cross section; and / or

[0021] Inlet cross section of multi-stage compressor;

[0022] The specified level is obtained by the following steps:

[0023] Obtain spectrum diagrams under multiple different working conditions;

[0024] According to the multiple frequency spectra, one or more stages of the compressor where the surge frequency is the most frequent are obtained;

[0025] The one or more stages at which the surge frequency is greatest are defined as the designated stages.

[0026] On the other hand, according to some embodiments of the present application, a readable medium is provided, on which a computer program is stored, wherein the program is executed by a processor to implement the compressor surge detection method as described above.

[0027] On the other hand, according to some embodiments of the present application, a compressor surge detection system is provided, comprising:

[0028] Dynamic pressure sensors installed at multiple stator leading edge blade tips and at the compressor outlet;

[0029] a memory for storing instructions executable by a processor; and

[0030] The processor is used to execute the instructions to implement the compressor surge detection method as described above.

[0031] The beneficial effects of the present invention are:

[0032] The compressor surge detection method collects and judges the dynamic pressure signals at multiple locations along the compressors, thereby avoiding the risks caused by the limitations of a single signal. At the same time, by detecting multiple locations along the process, the surge occurrence location can be accurately located, the surge fault mode can be detected at the first time, and the surge judgment time can be shortened.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0035] Figure 1 A schematic diagram of a flow chart according to some embodiments of the compressor surge detection method is shown;

[0036] Figure 2 A schematic diagram showing some embodiments of the compressor surge detection system is shown;

[0037] Figure 3 shows a spectrum diagram according to an embodiment of the present application;

[0038] Figure 4 A schematic diagram of a fitting curve according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0041] In the existing surge detection process, usually only one sensor is arranged at the outlet of the high-pressure compressor to detect the change of air pressure and then capture the engine surge signal. However, the inventors found that the surge detection based on the pressure signal at a single cross-sectional position still has the following problems:

[0042] 1) There is a risk of failure of sensors at single-section locations. If the sensor is damaged, surge detection cannot be carried out.

[0043] 2) The detection section of single-section detection is fixed, and there is a possibility that surge cannot be detected immediately. And because the sensor is arranged at the outlet of the high-pressure compressor, the surge section does not always occur first at the compressor outlet section. If surge occurs at the inlet section, the existing detection method cannot identify it until the pressure signal propagates downstream to the outlet section. During the signal transmission process, the blades are very likely to be severely damaged during the period of waiting for surge detection.

[0044] In order to improve the reliability of surge detection and reduce the risk of blade damage, on the one hand, according to some embodiments of the present application, a compressor surge detection method is provided. Figure 1 The flowchart of some embodiments of the compressor surge detection method is shown. The compressor surge detection method includes the following steps:

[0045] Step a. Collect dynamic pressure signals at multiple positions along the compressor. It can be understood that multiple positions along the compressor refer to multiple different positions along the flow direction of the airflow in the compressor, that is, the axial direction of the compressor.

[0046] Step b. Compare the multiple dynamic pressure signals with the dynamic pressure change threshold under the corresponding working conditions. If at least one dynamic pressure signal is greater than the dynamic pressure change threshold, it is determined that the compressor is surging. The corresponding working condition refers to the working condition of the engine when the dynamic pressure signals at multiple positions along the process are collected. For example, when the dynamic pressure signals at multiple positions are collected at 100% speed, the dynamic pressure change threshold is also the threshold value corresponding to 100% speed.

[0047] The compressor surge detection method collects and judges the dynamic pressure signals at multiple locations along the compressors, thereby avoiding the risks caused by the limitations of a single signal. At the same time, by detecting multiple locations along the process, the surge occurrence location can be accurately located, the surge fault mode can be detected at the first time, and the surge judgment time can be shortened.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] In one embodiment of the compressor surge detection method, the multiple positions include: a compressor outlet section and / or an inlet section of a multi-stage compressor. In the description of the embodiment of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0050] In one embodiment of the compressor surge detection method, the multiple positions include the compressor outlet section and the inlet section of each compressor stage. By detecting the inlet section of each compressor stage, the stage position where surge occurs can be quickly located, thereby shortening the surge detection time.

[0051] In one embodiment of the compressor surge detection method, in step a, the sampling rate of the dynamic pressure signal is greater than 100 times the maximum passing frequency of the compressor, thereby ensuring that the occurrence of surge can be detected in the first place.

[0052] In one embodiment of the compressor surge detection method, in step b, the dynamic pressure change threshold under the corresponding working condition is obtained by the following steps:

[0053] Obtain the minimum value of the dynamic pressure amplitude when the compressor surges under the corresponding working conditions, and obtain the average value of the steady-state pressure at that moment;

[0054] The dynamic pressure change threshold under the corresponding working condition is obtained by dividing the minimum dynamic pressure amplitude by the average steady-state pressure.

[0055] In one embodiment of the compressor surge detection method, dynamic pressure is collected under corresponding working conditions, and the dynamic pressure collection results are subjected to Fourier transformation to obtain frequency spectra of multiple positions under corresponding working conditions, and the minimum dynamic pressure amplitude and the corresponding steady-state pressure average value under the corresponding working conditions are obtained based on the frequency spectra.

[0056] In one embodiment of the compressor surge detection method, it also includes: obtaining dynamic pressure change thresholds corresponding to multiple operating conditions under the operating conditions, and fitting a fitting curve based on the multiple operating conditions and the corresponding dynamic pressure change thresholds, and obtaining the dynamic pressure change thresholds corresponding to the operating conditions under different operating conditions according to the fitting curve.

[0057] In one embodiment of the compressor surge detection method, the plurality of locations includes a designated stage outlet cross section and / or an inlet cross section of a multi-stage compressor.

[0058] Further, in one embodiment of the compressor surge detection method, the specified level is obtained by the following steps:

[0059] Obtain spectrum diagrams under multiple different working conditions;

[0060] According to the multiple frequency spectra, one or more stages of the compressor where the surge frequency is the most frequent are obtained;

[0061] The stage or stages where surge occurs most frequently are defined as designated stages.

[0062] Such an arrangement can achieve the reliability of surge signal detection under the premise of using as few measuring points as possible.

[0063] According to another aspect of the present application, a compressor surge detection system is also provided, such as Figure 2 A schematic diagram of some embodiments of the compressor surge detection system is shown, and the compressor surge detection system includes dynamic pressure sensors installed at the leading edge blade tips of multiple stators 1 and at the compressor outlet 2. The detection system also includes a memory and a processor, the memory is used to store instructions executable by the processor, and the processor is used to execute the instructions to implement the compressor surge detection method recorded in one or more embodiments as described above.

[0064] According to another aspect of the present application, the present application also provides a computer-readable medium. The above-mentioned computer-readable medium provided by the present disclosure has computer instructions thereon. When the computer instructions are executed by a processor, the program can be executed by the processor to implement the steps executed by the program in the compressor surge detection method described in the above embodiment.

[0065] It can be understood that the processors in the previous embodiments, such as one or a combination of one or more of a system on a chip (SOC), a microcontroller, a microprocessor (such as a single-chip microcomputer), a reduced instruction set computer (RISC), an application specific integrated circuit (ASIC), an application specific instruction integrated processor (ASIP), a central processing unit (CPU), a graphics processing unit (GPU), a physics processing unit (PPU), a microcontroller unit, a digital signal processor (DSP), a field programmable gate array (FPGA), an advanced RISC machine (ARM), a programmable logic device (PLD), any circuit or processor capable of performing one or more functions, etc.

[0066] The steps of the methods described in connection with the embodiments disclosed herein can be embodied directly in hardware, in software modules executed by a processor, or in a combination of the two. The software modules can reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read from and write to the storage medium. In an alternative, the storage medium can be integrated into the processor. The processor and the storage medium can reside in an ASIC. The ASIC can reside in a user terminal. In an alternative, the processor and the storage medium can reside in the user terminal as discrete components.

[0067] In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented as a computer program product in software, each function may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Computer-readable media include both computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one place to another. Storage media may be any available medium that can be accessed by a computer. As an example and not limitation, such a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure and can be accessed by a computer. Any connection is also properly referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwaves are included in the definition of the medium. Disk and disc as used herein include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disk often reproduces data magnetically, while disc reproduces data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0068] The present invention is further described below by a specific embodiment:

[0069] First, as attached Figure 3 As shown, the frequency spectrum of multiple sections along the compressor within 10s at 100% speed is given. The three coordinate axes in the figure are time (unit s), frequency (unit Hz), and amplitude (unit kPa). Surge occurs at three moments a, b, and c in the figure.

[0070] The surge frequency in the figure is less than 50Hz, and the surge amplitude range is 100kpa~300kpa. The minimum dynamic pressure amplitude when surge occurs at this speed is recorded as P10_min_100%, and the steady-state pressure average value P10_ave_100% at this moment is recorded at the same time. The dynamic pressure change threshold value P10_threshold_100% is obtained by dividing the two.

[0071] Similarly, the same test is carried out at other speeds to collect dynamic pressure and perform Fourier transformation to obtain the minimum dynamic pressure amplitude when surge occurs at other speeds of multiple sections. After obtaining the dynamic pressure change threshold value P10_threshold at different speeds of the section, the group of values ​​is fitted with the speed composition curve. The fitting results are shown in the figure. Figure 4 shown.

[0072] The square points in the figure represent the test measurement values ​​P10_threshold_(0-100%), and the black curve represents the fitting curve. The fitting curve satisfies the following formula, where x represents the rotation speed and y represents the calculated P10_threshold.

[0073] y=0.06e 1.66x .

[0074] Through the above fitting curve, the relationship between the dynamic pressure change threshold of multiple sections and the speed change curve when surge occurs can be obtained, and then the dynamic pressure change threshold of the section can be calculated at any speed, and surge detection is performed based on this value.

[0075] At the same time, it can be extended to any section to obtain the relationship between the dynamic pressure change threshold of the section and the speed change curve when surge occurs, and then the dynamic pressure change threshold of the section can be calculated at any section and any speed, and surge detection can be performed using this value.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A compressor surge detection method, It is characterized in that include: a. Collect dynamic pressure signals at multiple locations along the compressor; b. respectively comparing the multiple dynamic pressure signals with the dynamic pressure change threshold under the corresponding working conditions, and if at least one of the dynamic pressure signals is greater than the dynamic pressure change threshold, determining that the compressor is surging.

2. The compressor surge detection method according to claim 1, It is characterized in that The multiple locations include: Compressor outlet cross section; and / or Inlet cross section of a multi-stage compressor.

3. The compressor surge detection method according to claim 1, It is characterized in that The plurality of positions include a compressor outlet section and an inlet section of each compressor stage.

4. The compressor surge detection method according to claim 1, It is characterized in that In step a, the sampling rate of the dynamic pressure signal is greater than 100 times the maximum passing frequency of the compressor.

5. The compressor surge detection method according to claim 1, It is characterized in that In step b, the dynamic pressure change threshold under the corresponding working condition is obtained by the following steps: Obtain the minimum value of the dynamic pressure amplitude when the compressor surges under the corresponding working conditions, and obtain the average value of the steady-state pressure at that moment; The dynamic pressure change threshold value under the corresponding working condition is obtained by dividing the minimum dynamic pressure amplitude by the average steady-state pressure.

6. The compressor surge detection method according to claim 5, It is characterized in that By performing dynamic pressure acquisition under the corresponding working condition and performing Fourier transform on the dynamic pressure acquisition result to obtain frequency spectra of multiple positions under the corresponding working condition, the minimum dynamic pressure amplitude under the corresponding working condition and the corresponding steady-state pressure average value are obtained according to the frequency spectra.

7. The compressor surge detection method according to claim 6, It is characterized in that Dynamic pressure change thresholds corresponding to the working conditions under multiple different working conditions are obtained, and a fitting curve is fitted according to the multiple working conditions and the corresponding dynamic pressure change thresholds, and the dynamic pressure change thresholds corresponding to the working conditions under different working conditions are obtained according to the fitting curve.

8. The compressor surge detection method according to claim 7, It is characterized in that The multiple locations include: Specify the stage outlet cross section; and / or Inlet cross section of multi-stage compressor; The specified level is obtained by the following steps: Obtain spectrum diagrams under multiple different working conditions; According to the multiple frequency spectra, one or more stages of the compressor where the surge frequency is the most frequent are obtained; The one or more stages at which the surge frequency is greatest are defined as the designated stages.

9. A readable medium having a computer program thereon, It is characterized in that The program is executed by a processor to implement the compressor surge detection method as described in any one of claims 1-8.

10. A compressor surge detection system, It is characterized in that include: Dynamic pressure sensors installed at multiple stator leading edge blade tips and at the compressor outlet; a memory for storing instructions executable by a processor; as well as A processor, configured to execute the instructions to implement the compressor surge detection method according to any one of claims 1 to 8.

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