CN113532870B - Online identification system for working mode of engine - Google Patents

Abstract

The invention discloses an engine working mode online identification system, which comprises: the base body is arranged on the inner wall of an engine combustion chamber and is provided with an integrated end positioned on one side of the inner wall of the engine combustion chamber; the sensor group is integrated at the integration end of the base body and used for collecting experimental data in the engine combustion chamber; the calculation processing module is in communication connection with the sensor group and is used for receiving the experimental data acquired by the sensor group and analyzing and processing the experimental data; through the provided engine working mode online identification system, the isolation section shock wave intensity in the combustion chamber is collected through the force sensor module and the optical fiber sensor module respectively, the optical signal of spontaneous radiation in the combustion chamber is received, the collected pressure and the optical signal are converted into corresponding voltage signals respectively, and the voltage signals are subjected to operation processing through the calculation processing module to determine the isolation section shock wave intensity, the flame propagation speed and the flame state.

Description

An Engine Working Mode Online Identification System

technical field

The invention relates to the technical field of measurement of aerospace engine combustion chambers, in particular to an online engine working mode identification system.

Background technique

The flame propagation velocity, combustion state, and shock wave intensity in the isolation section of an aerospace engine are directly related to the combustion process and thrust characteristics of the engine.

In the development process of the model engine, there are problems such as limited space for opening measurement windows, harsh aerodynamic and thermal load environments, and high-temperature heat sealing, and in the limited space of the model engine performance test site, precise optical and mechanical experiments are carried out synchronously and integrated , it is difficult to judge the shock wave intensity and flame combustion state of the engine isolation section, and to obtain multi-field coupling information, all of which increase the complexity of the synchronous online visualization experiment of the engine and the development of the model engine.

In addition, in the past, optical fiber sensors and pressure sensors were separately arranged on the inner wall of the combustion chamber. Due to the need to separately open holes for installation on the wall of the combustion chamber, there were the following problems:

(1) When the sensor extends into the wall for measurement, the protruding sensor structure will affect the flow field in the combustion chamber, which is not conducive to accurate collection of various data;

(2) It is necessary to open a hole in the combustion chamber to install the sensor, so it will cause the influence of the non-smooth or concave-convex wall surface of the combustion chamber or similar reasons, which will interfere with the characteristics of the internal flow field such as the shock wave, especially in the case of a high flow rate in the internal flow field. huge influence;

(3) At present, the cross-section of the new type of combustion chamber is circular or arc-shaped, and the wall surface will have a curvature in a specific direction. The force sensor and the optical fiber sensor are separately opened and arranged separately, which cannot guarantee the repeatability of the measurement.

Contents of the invention

The purpose of the present invention is to provide an engine working mode online identification system to solve the problems in the prior art.

In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

An engine working mode online identification system, comprising:

The base body is arranged on the inner wall of the combustion chamber of the engine, and the base body has an integrated end located on one side of the inner wall of the combustion chamber of the engine;

A sensor group, integrated and arranged at the integration end of the base body, the sensor group is used to collect experimental data in the combustion chamber of the engine;

The computing processing module is connected to the sensor group in communication, and the computing processing module is used to receive the experimental data collected by the sensor group and perform analysis and processing; wherein,

The end surface of the integrated end is flush with the surface of the inner wall.

As a preferred solution of the present invention, the engine combustion chamber is provided with a substrate mounting hole communicating with its inner wall, and the substrate mounting hole is composed of an outer internal thread segment and an inner through hole segment;

The base body includes a threaded barrel that is connected to the inner threaded section of the base mounting hole, and a regular hexagonal connection block integrally formed with the threaded barrel, and the regular hexagonal connection block is screwed into the base body with the threaded barrel for installation. The hole is connected with the combustion chamber of the engine, and the threaded barrel and the inner center of the regular hexagonal connection block are provided with a through hole for installing the integrated end.

As a preferred solution of the present invention, the sensor group includes a force sensor, and three distribution forms are selected according to the characteristics of the pressure collection point and at least two optical fiber sensors are arranged, and the force sensor is installed along the axial center position of the integrated end A plurality of optical fiber sensors are distributed in a matrix around the axial center of the integrated end.

As a preferred solution of the present invention, the three distribution forms of the sensor group include:

Form 1: including the force sensor and two optical fiber sensors, and the two optical fiber sensors are symmetrically distributed about the central axis of the force sensor;

Form 2: including the force sensor and eight optical fiber sensors, and the eight optical fiber sensors are divided into four groups correspondingly in pairs and arranged on the transverse and longitudinal central axes of the force sensor;

Form three: including the force sensor and eight optical fiber sensors, and the eight optical fiber sensors are distributed symmetrically around the center of the outer circumference of the force sensor.

As a preferred solution of the present invention, the calculation and processing module is arranged in the central control device of the combustion chamber, and the calculation and processing module communicates with the force sensor and the plurality of optical fiber sensors respectively through external data lines connect;

The force sensor is used to collect the shock wave intensity of the isolation section in the combustion chamber, and convert the pressure signal into a voltage signal and transmit it to the calculation processing module;

The multiple optical fiber sensors are used to receive the optical signal of spontaneous radiation in the combustion chamber, and obtain the optical signal through photoelectric multiplication and analog-to-electrical conversion, and convert the optical signal into a corresponding voltage signal through wavelength selective amplification processing and then convert it into a voltage signal transmitted to the calculation processing module.

As a preferred solution of the present invention, the integrated end includes a sensor mounting column that is rotatably connected to the through hole inside the base body, and an inner wall flush column and an angle adjustment plate arranged at the front and rear ends of the sensor mounting column;

A large installation hole for installing the force sensor is opened on the axial central axis of the sensor installation column, and the inside of the sensor installation column is provided with holes for installing a corresponding number of the optical fiber sensors around the outer circumference of the large installation hole. Small mounting holes;

The inner wall flush column is used to fill the inner through hole section of the substrate installation hole and is flush with the inner wall, and the inner wall flush column is provided with a large installation hole and a plurality of small holes that match the sensor installation column. A detection hole connected to the installation hole, the detection structure of the force sensor and the plurality of optical fiber sensors passes through the detection hole to detect the interior of the engine combustion chamber;

The angle adjustment disc is attached to the end surface of the regular hexagonal connecting block, and four arc-shaped bolt grooves distributed along its axial direction are arranged inside the angle adjustment disc.

As a preferred solution of the present invention, the front end of the inner wall flush column has the same curvature as the inner wall of the combustion chamber, and the angle adjustment plate adjusts the orientation of the curved surface by rotating the sensor installation column together with the inner wall flush column.

As a preferred solution of the present invention, threaded holes are provided at the positions close to the six corners of the end face of the inner wall flush column, and the six threaded holes are connected with any one of the arc-shaped bolts on the angle adjustment plate. The grooves coincide, and the diameter of the threaded hole is smaller than the width of the arc bolt groove.

As a preferred solution of the present invention, both ends of the arc-shaped bolt groove on the angle adjustment plate are semicircular structures, and the centers of the two ends of the arc-shaped bolt groove are respectively connected to the regular hexagonal connecting block. Any two adjacent threaded holes on the top coincide, and the angle adjusting plate is installed at any angle through the four arc-shaped bolt grooves at least four for screwing into the inside of the threaded hole. bolt.

As a preferred solution of the present invention, the diameter of the angle adjustment plate is smaller than the width of any two opposite sides of the regular hexagonal connecting block.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention collects the shock wave intensity of the isolated section in the combustion chamber through the force sensor module and the optical fiber sensor module through the provided engine working mode online identification system, receives the optical signal of spontaneous radiation in the combustion chamber, and converts the collected pressure and optical signal respectively For the corresponding voltage signal, the voltage signal is subjected to calculation processing through the calculation processing module to determine the shock wave intensity, flame propagation speed and flame state of the isolation section;

(2) The present invention forms a compact integrated structure by integrating the force sensor and a plurality of optical fiber sensors on the substrate, which reduces the interference and damage to the wall surface of the combustion chamber and the interference to the internal flow field characteristics such as shock waves, And reduce the impact on the engine under the condition of high flow rate in the internal flow field;

(3) The present invention is designed to be flush with the inner wall of the combustion chamber by the inner wall flush column of the integrated sensor group, and the end face of the inner wall flush column is set as the same structure as the curvature of the inner wall of the combustion chamber. After the base body is installed, it can be By adjusting the angle of the integrated end, the end face of the inner wall flush column is consistent with the curvature of the inner wall of the combustion chamber, which further reduces the influence of the installation hole on the inner wall of the combustion chamber on the test results.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that are required in the description of the embodiments or the prior art. Apparently, the drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings according to the provided drawings without creative work.

FIG. 1 provides an overall structural schematic diagram of an embodiment of the present invention.

FIG. 2 is a schematic diagram of a distribution form of sensor groups provided by an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of an integrated terminal provided by an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of an angle adjustment plate provided by an embodiment of the present invention.

FIG. 5 is a schematic diagram of the end face structure of a regular hexagonal connection block provided by an embodiment of the present invention.

The labels in the figure are respectively indicated as follows:

101-substrate; 102-integrated end; 103-sensor group; 104-calculation processing module;

1011-thread barrel; 1012-positive hexagonal connection block; 1021-sensor mounting column; 1022-inner wall flush column; 1023-angle adjustment plate;

1031-force sensor; 1032-optical fiber sensor.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1 to 5, the present invention provides an online engine operating mode identification system, which has:

The base body 101 is arranged on the inner wall of the engine combustion chamber, and the base body 101 has an integrated end 102 located on one side of the inner wall of the engine combustion chamber;

The sensor group 103 is integrated at the integration end 102 of the substrate 101, and the sensor group 103 is used to collect experimental data in the combustion chamber of the engine;

The calculation processing module 104 is connected with the sensor group 103 in communication, and the calculation processing module 104 is used to receive the experimental data collected by the sensor group 103 and perform analysis and processing; wherein,

The end surface of the integrated end 102 is flush with the surface of the inner wall.

Wherein, the combustion chamber of the engine is provided with a substrate mounting hole connected to its inner wall, and the substrate mounting hole is composed of an outer internal thread section and an inner through hole section;

The base 101 includes a threaded cylinder 1011 that is connected to the internal threaded section of the base mounting hole, and a positive hexagonal connection block 1012 integrally formed with the threaded cylinder 1011. The positive hexagonal connection block 1012 is screwed into the base mounting hole through the threaded cylinder 1011 to connect with the engine combustion chamber , the inner center of the threaded cylinder 1011 and the regular hexagonal connecting block 1012 is provided with a through hole for installing the integrated end 102 .

The sensor group 103 includes a force sensor 1031, and selects three distribution forms according to the characteristics of the pressure collection point and arranges at least two optical fiber sensors 1032, the force sensor 1031 is installed along the axial center position of the integrated end 102, and a plurality of optical fiber sensors 1032 surround the integrated end 102 axial centers are distributed in matrix.

Three distribution forms of the sensor group 103 include:

Form 1: including a force sensor 1031 and two optical fiber sensors 1032, and the two optical fiber sensors 1032 are symmetrically distributed about the central axis of the force sensor 1031;

Form 2: It includes a force sensor 1031 and eight optical fiber sensors 1032, and the eight optical fiber sensors 1032 are divided into four groups corresponding to each other and arranged on the horizontal and longitudinal central axes of the force sensor 1031;

Form 3: It includes a force sensor 1031 and eight optical fiber sensors 1032 , and the eight optical fiber sensors 1032 are symmetrically distributed around the center of the outer circumference of the force sensor 1031 .

The calculation processing module 104 is arranged in the central control device of the combustion chamber, and the calculation processing module 104 is respectively connected to the force sensor 1031 and a plurality of optical fiber sensors 1032 through external data lines;

The force sensor 1031 is used to collect the shock wave intensity of the isolation section in the combustion chamber, and convert the pressure signal into a voltage signal and transmit it to the calculation processing module 104;

A plurality of optical fiber sensors 1032 are used to receive the optical signal of spontaneous radiation in the combustion chamber, and obtain the optical signal through photoelectric multiplication and analog-to-electrical conversion, and convert the optical signal into a corresponding voltage signal through wavelength selective amplification and then convert it into a voltage signal and transmit it to the computer. processing module 104 .

The present invention provides an engine working mode online identification system, respectively collects the shock wave intensity of the isolation section in the combustion chamber through the force sensor module and the optical fiber sensor module, receives the optical signal of spontaneous radiation in the combustion chamber, and converts the collected pressure and optical signal into corresponding The voltage signal is calculated and processed by the calculation and processing module to determine the shock wave intensity, flame propagation speed and flame state of the isolation section;

In this way, real-time online measurement of the shock wave intensity, flame propagation velocity, and flame combustion state (equivalence ratio single distribution, flame front position, heat release rate change, etc.) of the isolated section of the combustion chamber can be realized in a limited space;

Wherein, the integrated end 102 includes a sensor mounting column 1021 rotatably connected to the inner through hole of the base body 101, and an inner wall flush column 1022 and an angle adjustment plate 1023 arranged at the front and rear ends of the sensor mounting column 1021;

A large installation hole for installing the force sensor 1031 is opened on the axial center axis of the sensor installation column 1021, and the inside of the sensor installation column 1021 is provided with a small installation hole for installing a corresponding number of optical fiber sensors 1032 around the periphery of the large installation hole;

The inner wall flush column 1022 is used to fill the inner through hole section of the substrate installation hole and is flush with the inner wall, and the inner wall flush column 1022 is provided with a detection hole that is connected with the large installation hole in the sensor installation column 1021 and a plurality of small installation holes, The detection structure of the force sensor 1031 and a plurality of optical fiber sensors 1032 passes through the detection hole to detect the inside of the combustion chamber of the engine;

The angle adjusting disc 1023 is attached to the end surface of the regular hexagonal connecting block 1012, and the inside of the angle adjusting disc 1023 is provided with four arc-shaped bolt grooves distributed along its axial direction.

The front end surface of the inner wall flush column 1022 has the same curvature as the inner wall of the combustion chamber, and the angle adjustment disc 1023 adjusts the orientation of the curved surface through the rotation of the sensor installation column 1021 and the inner wall flush column 1022 .

The end face of the inner wall flush column 1022 is provided with threaded holes near the six corners, and the six threaded holes coincide with any arc-shaped bolt groove on the angle adjustment plate 1023, and the diameter of the threaded hole is smaller than the width of the arc-shaped bolt groove .

Both ends of the arc-shaped bolt groove on the angle adjustment plate 1023 are semicircular structures, and the centers of the two ends of the arc-shaped bolt groove coincide with any adjacent two threaded holes on the regular hexagonal connection block 1012 respectively, and the angle adjustment plate angle At any angle, the adjusting disc 1023 is installed with at least four compression bolts for screwing into the threaded holes through four arc-shaped bolt grooves.

The diameter of the angle adjusting disc 1023 is smaller than the width of any two opposite sides of the regular hexagonal connecting block 1012 .

By integrating the force sensor and multiple optical fiber sensors on the substrate to form a compact one-piece structure, the interference and damage to the wall of the combustion chamber and the interference to the characteristics of the internal flow field such as the shock wave are reduced, especially the internal flow The significant impact on the engine under the condition of high flow rate also avoids the problem that the wall of the new combustion chamber has a specific orientation curvature, and the force sensor and the optical fiber sensor are separately opened and arranged separately, which cannot guarantee the repeatability of the measurement.

When installing, first screw the base 101 into the base installation hole opened on the combustion chamber, and use a wrench to match the positive hexagonal connection block 1012 of the base 101 and tighten the threaded barrel 1011. At this time, observe that the inner wall of the integrated end 102 is flush with the front face of the 1022 Whether the curvature and the curvature of the inner wall are in the same direction, and if the direction is not consistent, it will cause a concave-convex structure on the inner wall of the combustion chamber, which will affect the progress of the test.

At this time, by rotating the angle adjustment disc 1023 on the back of the base body 101, the angle adjustment disc 1023, together with the sensor mounting column 1021 and the inner wall flush column 1022, rotate synchronously until the curvature of the front end of the inner wall flush column 1022 is aligned with the curvature of the inner wall and At this time, the position of the angle adjustment plate 1023 can be fixed, and the bolts are screwed into the threaded holes provided on the back of the regular hexagonal connection block 1012 through the arc groove on the angle adjustment plate 1023, because the back of the regular hexagonal connection block 1021 The included angle between the six threaded holes is 60°, and the length of the arc groove on the angle adjusting disc 1023 just covers two adjacent threaded holes, so at least four bolts can be screwed into the back of the angle adjusting disc 1023, In this way, the angle adjustment plate 1023 is fixed and pressed on the back of the regular hexagonal connecting block 1012 , and the orientation of the end surface of the inner wall flush column 1022 is also fixed.

The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements shall also be deemed to fall within the protection scope of the present application.

Claims (7)

1. A system for online identification of engine operating modes, characterized in that, possesses: a base body (101), arranged on the inner wall of the engine combustion chamber, and the base body (101) has an integrated end (102) located on one side of the engine combustion inner wall; A sensor group (103), integrated and arranged at the integration end (102) of the base body (101), the sensor group (103) is used to collect experimental data in the combustion chamber of the engine; A calculation processing module (104), connected in communication with the sensor group (103), the calculation processing module (104) is used to receive and analyze the experimental data collected by the sensor group (103); wherein, The end face of the integrated end (102) is flush with the surface of the inner wall; The combustion chamber of the engine is provided with a substrate mounting hole communicating with its inner wall, and the substrate mounting hole is composed of an outer internal thread segment and an inner through hole segment; The base (101) includes a threaded barrel (1011) that is connected to the inner threaded section of the base mounting hole, and a regular hexagonal connecting block (1012) integrally formed with the threaded barrel (1011), the regular hexagonal connecting block (1012) is connected with the combustion chamber of the engine by screwing the threaded barrel (1011) into the mounting hole of the base body, and the internal center position of the threaded barrel (1011) and the regular hexagonal connecting block (1012) is set by opening There are through holes for installing the integrated end (102); The integrated end (102) includes a sensor mounting column (1021) that is rotatably connected to the through hole inside the base body (101), and an inner wall flush column (1022) and an angle Adjustment dial (1023); A large installation hole for installing the force sensor (1031) is opened on the axial central axis of the sensor installation column (1021), and the inside of the sensor installation column (1021) is provided with a hole for installation around the outer circumference of the large installation hole. Small mounting holes corresponding to the number of fiber optic sensors (1032); The inner wall level column (1022) is used to fill the inner through hole section of the substrate installation hole and is flush with the inner wall, and the inner wall level column (1022) is provided with a sensor installation column (1021 ) A detection hole in which the large installation hole and a plurality of small installation holes are connected, and the detection structures of the force sensor (1031) and the plurality of optical fiber sensors (1032) pass through the detection hole to detect the interior of the engine combustion chamber ; The angle adjusting disc (1023) fits the end face of the regular hexagonal connecting block (1012), and the inside of the angle adjusting disc (1023) is provided with four arc-shaped bolt grooves distributed along its axial direction; The front end surface of the inner wall flush column (1022) has the same curvature as the inner wall of the combustion chamber, and the angle adjustment disc (1023) adjusts the curved surface through the rotation of the sensor installation column (1021) and the inner wall flush column (1022). towards. 2. A system for online identification of engine operating modes according to claim 1, characterized in that: said sensor group (103) includes a force sensor (1031), and three distribution forms are selected and set according to the characteristics of pressure collection points At least two optical fiber sensors (1032), the force sensor (1031) is installed along the axial center position of the integrated end (102), and a plurality of optical fiber sensors (1032) are axially arranged around the integrated end (102) The centers are distributed in a matrix. 3. A system for online identification of engine operating modes according to claim 2, characterized in that, the three distribution forms of the sensor group (103) include: Form 1: including the force sensor (1031) and two optical fiber sensors (1032), and the two optical fiber sensors (1032) are symmetrically distributed about the central axis of the force sensor (1031); Form 2: including the force sensor (1031) and eight of the optical fiber sensors (1032), and the eight optical fiber sensors (1032) are divided into four groups in pairs and arranged on the force sensor (1031) respectively. On the horizontal and longitudinal central axes; Form three: including the force sensor (1031) and eight optical fiber sensors (1032), and the eight optical fiber sensors (1032) are symmetrically distributed around the outer circumference center of the force sensor (1031). 4. An engine working mode online identification system according to claim 3, characterized in that: the calculation processing module (104) is arranged in the central control device of the combustion chamber, and the calculation processing module ( 104) communicating with the force sensor (1031) and the plurality of optical fiber sensors (1032) through external data lines; The force sensor (1031) is used to collect the shock wave intensity of the isolation section in the combustion chamber, and convert the pressure signal into a voltage signal and transmit it to the calculation processing module (104); The plurality of optical fiber sensors (1032) are used to receive the optical signal of spontaneous radiation in the combustion chamber, and obtain the optical signal through photoelectric multiplication and analog-to-electrical conversion, and convert the optical signal into a corresponding voltage signal through wavelength selection and amplification processing. The voltage signal is transmitted to the calculation processing module (104). 5. The online identification system of engine working mode according to claim 1, characterized in that: the end face of the regular hexagonal connecting block (1012) is provided with threaded holes near the six corners, and the six The threaded hole coincides with any one of the arc-shaped bolt grooves on the angle adjustment plate (1023), and the diameter of the threaded hole is smaller than the width of the arc-shaped bolt groove. 6. A system for online identification of engine working modes according to claim 5, characterized in that: both ends of the arc-shaped bolt groove on the angle adjustment plate (1023) are semicircular structures, and the The centers of circles at both ends of the arc-shaped bolt groove coincide with any two adjacent threaded holes on the regular hexagonal connecting block (1012), and the angle adjusting plate (1023) passes through the four holes at any angle. The arc-shaped bolt groove is equipped with at least four compression bolts for screwing into the inside of the threaded hole. 7. The online identification system of engine working mode according to claim 6, characterized in that: the diameter of the angle adjustment plate (1023) is smaller than the width of any two opposite sides of the regular hexagonal connecting block (1012) .

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