CN116255279A - Device for measuring jet gas-liquid interface in closed space - Google Patents
Device for measuring jet gas-liquid interface in closed space Download PDFInfo
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- CN116255279A CN116255279A CN202310538878.XA CN202310538878A CN116255279A CN 116255279 A CN116255279 A CN 116255279A CN 202310538878 A CN202310538878 A CN 202310538878A CN 116255279 A CN116255279 A CN 116255279A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/96—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by specially adapted arrangements for testing or measuring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/86—Combinations of sonar systems with lidar systems; Combinations of sonar systems with systems not using wave reflection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Combustion & Propulsion (AREA)
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Abstract
The invention provides a device for measuring a jet gas-liquid interface in a closed space, which relates to the technical field of measuring devices, and comprises: the device comprises a jet flow generating mechanism, a correcting mechanism, an actual application mechanism, a data acquisition mechanism and a control processing mechanism, wherein the data acquisition mechanism is in signal connection with the control processing mechanism; the correction mechanism includes: transparent airtight field, first supersonic generator, camera and a plurality of first supersonic microphone with data acquisition mechanism signal connection, practical application mechanism includes: the device comprises an application sealing field, a second ultrasonic generator and a plurality of second ultrasonic microphones which are in signal connection with a data acquisition mechanism, wherein in a correction stage, a jet flow generating mechanism is communicated with the transparent sealing field, and in an application stage, the jet flow generating mechanism is communicated with the application sealing field. The measuring device alleviates the problems of the conventional optical measuring technique that an optical window must be opened and the central high-density jet is blocked by the gaseous mixture with relatively low density at the periphery of the jet.
Description
Technical Field
The invention relates to the technical field of measuring devices, in particular to a device for measuring a jet gas-liquid interface in a closed space.
Background
Unstable combustion is one of the major scientific and technical problems in the development process of aviation and aerospace engines, and under the conditions of high temperature, high pressure and high energy density, flow, combustion and acoustic disturbance are extremely easy to generate coupling, so that the pressure and heat release of a combustion chamber are rapidly pulsed, and engine parts are ablated or even exploded. In the research process of unstable combustion of a liquid rocket engine, the coupling effect of core sound waves, flow and heat release rate is achieved, and sound waves can affect the downstream combustion process and also jet liquid propellant so as to enable a gas-liquid interface to generate corresponding fluctuation. Therefore, in order to acquire the transfer function of each link of the liquid spray flame to meet the requirement of unstable combustion analysis, the fluctuation of the gas-liquid interface of the liquid jet is also required to be measured.
At present, a background schlieren technology and a direct shooting method are often adopted to measure the gas-liquid interface fluctuation of liquid jet, and the background schlieren technology and a laser interference technology are influenced due to the shielding effect of a gaseous mixture with relatively low jet peripheral density on a central high-density jet; furthermore, both of the above approaches are optical measurement approaches, which also require an optical window, which is not acceptable for a real rocket engine.
Disclosure of Invention
The invention aims to provide a device for measuring a jet gas-liquid interface in a closed space, which is used for relieving the technical problem that optical measurement means such as a background schlieren technology and a laser interference technology are influenced due to the shielding effect of a gaseous mixture with relatively low jet peripheral density on a central high-density jet in the related technology, and the optical measurement means also needs an optical window, so that the device is unacceptable for a real rocket engine.
The device for measuring the jet flow gas-liquid interface in the closed space provided by the invention comprises the following components: the device comprises a jet flow generating mechanism, a correcting mechanism, an actual application mechanism, a data acquisition mechanism and a control processing mechanism, wherein the data acquisition mechanism is in signal connection with the control processing mechanism;
the correction mechanism includes: the device comprises a transparent closed field, a first ultrasonic generator, a camera and a plurality of first ultrasonic microphones, wherein the camera and the plurality of first ultrasonic microphones are in signal connection with the data acquisition mechanism, the first ultrasonic generator and the plurality of first ultrasonic microphones are arranged in the transparent closed field and are distributed at intervals along the circumferential direction of the transparent closed field, and the camera is used for shooting jet flow in the transparent closed field;
the practical application mechanism comprises: the device comprises an application closed field, a second ultrasonic generator and a plurality of second ultrasonic microphones which are in signal connection with the data acquisition mechanism, wherein the second ultrasonic generator and the second ultrasonic microphones are arranged on the application closed field and are distributed at intervals along the circumferential direction of the application closed field;
the control processing mechanism comprises a synchronizer, the jet flow generating mechanism is communicated with the transparent airtight field in a correction stage, and the first ultrasonic generator, the camera and the plurality of first ultrasonic microphones are all connected with the synchronizer in a signal manner;
in the application stage, the jet flow generating mechanism is communicated with the application sealing field, and the second ultrasonic generator and the second ultrasonic microphone are both in signal connection with the synchronizer.
Optionally, the correction mechanism further includes a first protection component for protecting the first ultrasonic microphone, the first protection component is mounted on the transparent enclosure, and the first ultrasonic microphone is mounted on the first protection component.
Optionally, the practical application mechanism further includes a second protection component for protecting the second ultrasonic microphone, the second protection component is installed in the application enclosure, and the second ultrasonic microphone is installed in the second protection component.
Optionally, the second protection component comprises a positioning sleeve and a positioner, wherein the positioning sleeve is fixedly sleeved at the receiving end of the second ultrasonic microphone and is provided with a first measuring hole opposite to the receiving end of the second ultrasonic microphone;
the locator is sleeved on the locating sleeve and is arranged on the side wall of the application sealed field, and the first measuring hole is communicated with the application sealed field.
Optionally, the side wall of the positioner is provided with a cooling cavity for accommodating a cooling medium.
Optionally, the jet generating mechanism comprises a syringe pump, a nozzle and a communication pipeline, wherein the communication pipeline is respectively communicated with the syringe pump and the nozzle, and the nozzle is used for generating a flow field into the transparent airtight field or the application airtight field.
Optionally, the jet generating mechanism further comprises a disturbance applicator to which the syringe pump is mounted.
Optionally, the jet generating mechanism further comprises a moving assembly, the nozzle is mounted on the moving assembly, and the moving assembly is used for driving the nozzle to move along the X direction and the Y direction.
Optionally, the jet generating mechanism further comprises an adapter mounted to the moving assembly, the nozzle being mounted to the adapter.
Optionally, the device for measuring the jet gas-liquid interface in the closed space further comprises a test platform and a plurality of microphone positioning mechanisms;
in the correction stage, the transparent closed field and the microphone positioning mechanisms are detachably arranged on the test platform, the microphone positioning mechanisms are distributed at intervals along the circumferential direction of the transparent closed field, and the first ultrasonic microphones are correspondingly arranged on the microphone positioning mechanisms one by one;
in the application stage, the application sealing field and the microphone positioning mechanisms are detachably mounted on the test platform, the microphone positioning mechanisms are distributed at intervals along the circumferential direction of the application sealing field and correspond to the microphone positioning mechanisms one by one in the correction stage, and the second ultrasonic microphones are mounted on the microphone positioning mechanisms one by one in a corresponding manner.
The device for measuring the jet flow gas-liquid interface in the closed space comprises a correction stage and an application stage, wherein the jet flow generating mechanism generates jet flow in the transparent closed field in the correction stage, the first ultrasonic generator transmits ultrasonic signals to the jet flow, and the plurality of first ultrasonic microphones receive the signals reflected from the jet flow and transmit the signals to the control processing mechanism; meanwhile, the camera shoots the jet image, the image is transmitted to the control processing mechanism through the data acquisition mechanism, the control processing mechanism compares the data output by the first ultrasonic microphone with the data extracted from the shot image, and a database meeting the precision requirement is built based on the data;
in the application stage, the jet generating mechanism generates jet in the application sealed field, the second ultrasonic generator emits ultrasonic signals to the jet, the second ultrasonic microphones receive signals reflected from the jet and transmit the signals to the control processing mechanism, and the control processing mechanism can obtain the position and fluctuation condition of the jet gas-liquid interface of the position to be detected in the application sealed field according to the database established in the correction stage, so that the determination of the liquid core and the gas-liquid interface is realized.
Compared with the prior art, the ultrasonic waves emitted by the first ultrasonic generator and the second ultrasonic generator in the device for measuring the jet flow gas-liquid interface in the closed space are not influenced by the shielding effect of the gaseous mixture with relatively low jet flow peripheral density on the central high-density jet flow, an optical window is not required to be opened, and the dynamic measurement of the gas-liquid interface in the spray combustion jet flow stage in the high-temperature high-pressure closed space such as a real rocket engine can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings that are required to be used in the description of the embodiments or the related art will be briefly described, and it is apparent that the drawings in the description below are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic structural diagram of a device for measuring jet gas-liquid interface in a closed space in a calibration stage according to an embodiment of the present invention;
FIG. 2 is a schematic installation diagram of a mechanism for practical application in a device for measuring jet gas-liquid interface in a closed space according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a transparent closed field of a device for measuring jet gas-liquid interface in a closed space according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a practical application mechanism of a device for measuring a jet gas-liquid interface in a closed space according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second protection component in the device for measuring a jet gas-liquid interface in a closed space according to the embodiment of the present invention;
FIG. 6 is a cross-sectional view of a second protective assembly in an apparatus for measuring jet gas-liquid interface in a confined space according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an application of a closed field in a device for measuring jet gas-liquid interface in a closed space according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a moving assembly in a device for measuring a jet gas-liquid interface in a closed space according to an embodiment of the present invention.
Icon: 110-nozzles; 120-moving the assembly; 121-a first support bar; 122-a first slide rail; 123-a first slider; 124-a second support bar; 125-a second slide rail; 126-a second slider; 130-an adapter; 131-vertical plates; 132-horizontal plates; 200-correction mechanism; 210-a transparent enclosure; 211-a first connection flange; 212-connecting through holes; 220-a first ultrasonic generator; 230-a camera; 240-a first ultrasonic microphone; 300-a practical application mechanism; 310-application of a containment field; 311-a second connecting flange; 312-mounting slots; 313-second measurement aperture; 320-a second ultrasonic generator; 330-a second protection component; 331-positioning sleeve; 332-a positioner; 333-first measurement aperture; 334-cooling chamber; 335-a third connecting flange; 336-limiting plate; 400-a test platform; 500-microphone positioning mechanism; 510-a fourth slide rail; 520-fourth slider; 530-a connecting rod; 540-a support base; 610-a stent; 620—a support table; 630-supporting bar.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 4, a device for measuring a jet gas-liquid interface in a closed space according to an embodiment of the present invention includes: the device comprises a jet flow generating mechanism, a correcting mechanism 200, an actual application mechanism 300, a data acquisition mechanism and a control processing mechanism, wherein the data acquisition mechanism is in signal connection with the control processing mechanism; the correction mechanism 200 is used for constructing a reference database conforming to the precision, and specifically includes: the device comprises a transparent airtight field 210, a first ultrasonic generator 220, a camera 230 and a plurality of first ultrasonic microphones 240 which are in signal connection with a data acquisition mechanism, wherein the first ultrasonic generator 220 and the plurality of first ultrasonic microphones 240 are arranged on the transparent airtight field 210 and are distributed at intervals along the circumferential direction of the transparent airtight field 210, and the camera 230 is used for shooting jet flow in the transparent airtight field 210; the actual application mechanism 300 is used for generating a required actual measurement environment, and specifically includes: the application sealing field 310, the second ultrasonic generator 320 and a plurality of second ultrasonic microphones connected with the data acquisition mechanism in a signal manner, wherein the second ultrasonic generator 320 and the plurality of second ultrasonic microphones are arranged on the application sealing field 310 and are distributed at intervals along the circumferential direction of the application sealing field 310; the control processing mechanism comprises a synchronizer, and in the correction stage, the jet flow generating mechanism is communicated with the transparent closed field 210, and the first ultrasonic generator 220, the camera 230 and the plurality of first ultrasonic microphones 240 are all in signal connection with the synchronizer; in the application phase, the jet generating mechanism is communicated with the application sealing field 310, and the second ultrasonic generator 320 and the second ultrasonic microphone are both connected with the synchronizer in a signal manner.
Specifically, as shown in fig. 3, the transparent closed field 210 is cylindrical and made of a transparent material, for example: glass, transparent acryl, or the like. One end of the outer peripheral wall of the transparent airtight field 210 is provided with a first connection flange 211, as shown in fig. 2, in the correction stage, the axis of the transparent airtight field 210 is arranged in the vertical direction, one end of the transparent airtight field 210 is mounted on the test platform 400 through bolts and the first connection flange 211, the other end is connected with the jet generating mechanism, and in the correction stage, both ends of the transparent airtight field 210 are sealed. The first ultrasonic generator 220 and the plurality of first ultrasonic microphones 240 are both mounted on the outer peripheral wall of the transparent airtight field 210 and are distributed at intervals along the circumferential direction of the transparent airtight field 210, and the transmitting end of the first ultrasonic generator 220 and the receiving ends of the plurality of first ultrasonic microphones 240 are both opposite to the inner area of the transparent airtight field 210 and are located on the same horizontal plane.
The application sealing field 310 is cylindrical, one end of the peripheral wall of the application sealing field 310 is provided with a second connecting flange 311, one end of the application sealing field 310 is arranged on the test platform 400 through connecting bolts and the second connecting flange 311 in the application stage, the other end of the application sealing field is connected with the jet flow generating mechanism, and both ends of the application sealing field 310 are sealed in the application stage. The second ultrasonic generator 320 and the plurality of second ultrasonic microphones are both mounted on the peripheral wall of the application enclosure field 310 and are distributed at intervals along the circumferential direction of the application enclosure field 310, and the transmitting end of the second ultrasonic generator 320 and the receiving ends of the plurality of second ultrasonic microphones are both opposite to the inner area of the application enclosure field 310 and are located on the same horizontal plane.
The device for measuring the jet gas-liquid interface in the closed space provided by the embodiment of the invention further comprises a power amplifier, wherein the power amplifier is matched with the first ultrasonic generator 220 or the second ultrasonic generator 320 and is used for transmitting modulated ultrasonic signals into the closed field. The types of the first ultrasonic generator 220 and the second ultrasonic generator 320 are selected according to actual requirements, including but not limited to high voltage electrodes, moving coil ultrasonic horns, piezoelectric ceramics and piezoelectric sheets; the power amplifier is required to be combined with the selection of the ultrasonic generator for determination; the modulated signals include, but are not limited to, continuous sinusoidal signals, pulsed Tone burst signals, pulsed abrupt signals, pulsed sweep signals, etc., and the signals are selected according to actual measurement requirements. The first ultrasonic microphone 240 and the second ultrasonic microphone are selected according to the requirement, and a quarter or eighth of the microphones can be selected, so that the sensitivity is ensured and the microphones are protected conveniently.
The correction mechanism 200 also includes a jet background light source for ensuring imaging effects when the jet is photographed.
The device for measuring the jet gas-liquid interface in the closed space provided by the embodiment of the invention comprises a correction stage and an application stage, wherein the jet generating mechanism generates jet flow into the transparent closed field 210 in the correction stage, the first ultrasonic generator 220 transmits ultrasonic signals to the jet flow, and the plurality of first ultrasonic microphones 240 receive the signals reflected from the jet flow and transmit the signals to the control processing mechanism; the synchronizer is used for realizing synchronous acquisition of ultrasonic signals by the camera 230 and the first ultrasonic microphone 240, simultaneously shooting a jet image by the camera 230, transmitting the image to the control processing mechanism through the data acquisition mechanism, comparing the data output by the first ultrasonic microphone 240 with the data extracted from the shot image by the control processing mechanism, and establishing a database meeting the precision requirement based on the data;
in the application stage, the jet generating mechanism generates jet into the application sealed field 310, the second ultrasonic generator 320 emits ultrasonic signals to the jet, the second ultrasonic microphones receive signals reflected from the jet and transmit the signals to the control processing mechanism, and the control processing mechanism can obtain the position and fluctuation condition of the jet gas-liquid interface of the position to be detected in the application sealed field 310 according to the database established in the correction stage, so that the determination of the liquid core and the gas-liquid interface is realized.
Compared with the prior art, in the device for measuring the jet flow gas-liquid interface in the closed space, the ultrasonic waves emitted by the first ultrasonic generator 220 and the second ultrasonic generator are not influenced by the shielding effect of the gaseous mixture with relatively low jet flow peripheral density on the central high-density jet flow, an optical window is not required to be opened, and the dynamic measurement of the gas-liquid interface in the spray combustion jet flow stage in the high-temperature high-pressure closed space such as a real rocket engine can be realized; in addition, the device for measuring the jet flow gas-liquid interface in the closed space provided by the embodiment of the invention measures the gas-liquid interface of the liquid in the air, and compared with the device for measuring the bubbles in the liquid in the prior art, the device for measuring the jet flow gas-liquid interface in the closed space has the advantage that the attenuation of sound waves in the liquid is smaller than that of the sound waves in the liquid, so that the measurement is easier to realize.
Optionally, the calibration mechanism 200 further includes a first protection component for protecting the first ultrasonic microphone 240, the first protection component being mounted to the transparent enclosure 210, the first ultrasonic microphone 240 being mounted to the first protection component.
Specifically, the first protection component includes a protection sleeve, which may be made of a ceramic material, and the number of the protection sleeves is equal to that of the first ultrasonic microphones 240, and the plurality of protection sleeves are sleeved on the receiving ends of the plurality of first ultrasonic microphones 240 in a one-to-one correspondence manner. As shown in fig. 3, the outer peripheral wall of the transparent airtight field 210 is provided with a plurality of connecting through holes 212, the number of which is equal to that of the protective sleeves, and the protective sleeves are inserted into the connecting through holes 212 in a one-to-one correspondence manner, and the receiving end of the first ultrasonic microphone 240 is opposite to the inner area of the transparent airtight field 210. The protective sleeve protects the first ultrasonic microphone 240 and ensures normal use of the first ultrasonic microphone 240.
In one embodiment of the present application, as shown in fig. 4, the practical application mechanism 300 further includes a second protection component 330 for protecting the second ultrasonic microphone, the second protection component 330 is mounted on the application enclosure 310, and the second ultrasonic microphone is mounted on the second protection component 330. The number of the second protection components is equal to the number of the second ultrasonic microphones, and is connected with the plurality of the second ultrasonic microphones in a one-to-one correspondence, each of the second ultrasonic microphones is mounted on the outer peripheral wall of the application enclosure 310 through the corresponding second protection component 330, and the receiving end is opposite to the inner region of the application enclosure 310. Each second protection component 330 plays a role in protecting the corresponding second ultrasonic protection component, and ensures the normal use of the second ultrasonic microphone.
Specifically, as shown in fig. 5 and 6, the second protection component 330 includes a positioning sleeve 331 and a positioner 332, where the positioning sleeve 331 is fixedly sleeved on the receiving end of the second ultrasonic microphone, and is provided with a first measuring hole 333 opposite to the receiving end of the second ultrasonic microphone; the positioner 332 is sleeved on the positioning sleeve 331 and is mounted on the side wall of the application sealing field 310, and the first measuring hole 333 is communicated with the application sealing field 310.
Specifically, each of the second protection assemblies 330 includes a positioning sleeve 331 and a positioner 332, the positioning sleeve 331 is cylindrical, and one end is provided with a first measuring hole 333, the second ultrasonic microphone is inserted into the positioning sleeve 331, and the receiving end of the second ultrasonic microphone is opposite to the first measuring hole 333. The positioner 332 is cylindrical, and one end of the outer peripheral wall is provided with a third connecting flange 335, and the third connecting flange 335 is provided with a plurality of mounting through holes, and the plurality of mounting through holes are distributed at intervals along the circumferential direction of the third connecting flange 335. As shown in fig. 7, the outer peripheral wall of the first end of the application sealing field 310 is provided with mounting slots 312 equal in number to the second ultrasonic microphones, the bottom wall of the mounting slots 312 is provided with second measuring holes 313 communicated with the interior of the application sealing field 310, a plurality of positioners 332 are inserted in the mounting slots 312 in one-to-one correspondence, the outer peripheral wall of the positioners 332 is abutted against the side walls of the mounting slots 312, and the first measuring holes 333 are communicated with the second measuring holes 313. The inner peripheral wall of the second end of the locator 332 is provided with a limiting plate 336, the locating sleeve 331 is inserted into the locator 332, the part provided with the first measuring hole 333 penetrates through the limiting plate 336, and the limiting plate 336 is abutted with other parts of the end face of the locating sleeve 331 to limit the locating sleeve 331. The outer circumference of each mounting groove 312 is provided with a plurality of screw holes, and when the positioner 332 is mounted on the application enclosure 310, the connecting bolts pass through the mounting through holes on the third connecting flange 335 and are matched with the corresponding screw holes, so that the positioner 332 is mounted on the application enclosure 310, and the second ultrasonic microphone is mounted on the application enclosure 310. The positioning sleeve 331 and the positioner 332 cooperate to position and protect the second ultrasonic microphone, so as to ensure the normal use of the second ultrasonic microphone.
Further, as shown in fig. 6, the sidewall of the retainer 332 is provided with a cooling cavity 334 for accommodating a cooling medium. Specifically, the cooling chamber 334 extends along the circumferential direction of the retainer 332, and an inlet and outlet hole communicating with the cooling chamber 334 is provided in the outer circumferential wall of the retainer 332, and the cooling medium may be introduced into the cooling chamber 334 through the inlet and outlet, or the cooling medium in the cooling chamber 334 may be discharged. In the application stage, the cooling medium absorbs heat generated by the second ultrasonic microphone, plays a role in cooling the second ultrasonic microphone, avoids influencing the normal operation of the second ultrasonic microphone due to overhigh temperature, and protects the second ultrasonic microphone in a high-temperature high-pressure closed space in a real application space by setting the cooling cavity 334.
In one embodiment of the present application, the jet generating mechanism includes a syringe pump, a nozzle 110, and a communication line in communication with the syringe pump and the nozzle 110, respectively, the nozzle 110 being configured to generate a flow path into the transparent enclosure 210 or the application enclosure 310.
Specifically, the injection pump adopts a high-precision injection pump, and the high-precision injection pump can generate jet flow of water or other working media with required size according to the requirement. In the calibration phase, the nozzle 110 is in communication with the interior of the transparent containment field 210, and in the application phase, the nozzle 110 is in communication with the application containment field 310. The high precision syringe pump supplies a plurality of types of common flow fields, such as jet, droplet or spray, through the nozzle 110 into the transparent containment field 210 or application containment field 310 for calibration or practical detection applications.
The jet generating mechanism further includes a disturbance applicator to which the syringe pump is mounted. The disturbance applying part is arranged as a vibration exciter, the injection pump is arranged on the vibration exciter and used for generating required disturbance to cause the surface fluctuation of jet flow and generating a more complex flow field in a closed space so as to simulate the jet flow change in a real measurement environment.
As shown in fig. 1, the jet generating mechanism further includes a moving assembly 120, the nozzle 110 is mounted on the moving assembly 120, and the moving assembly 120 is used for driving the nozzle 110 along the X-direction and the Y-direction to simulate the position change that may be generated by the actual jet in the combustion chamber of the engine.
Specifically, the device for measuring the jet gas-liquid interface in the closed space according to the embodiment of the invention further comprises a support 610, wherein the support 610 is detachably mounted on the support 620. As shown in fig. 8, the moving assembly 120 includes a first support rod 121, a first sliding rail 122, a first slider 123, a second support rod 124, a second sliding rail 125, and a second slider 126, wherein the first support rod 121 is disposed along the X direction and fixedly mounted on the support 610, and the first sliding rail 122 is disposed along the X direction and fixedly mounted on the upper surface of the first support rod 121; the second supporting rod 124 is arranged along the Y direction and is mounted on the first sliding block 123, the first sliding block 123 is in sliding fit with the first sliding rail 122, and the second sliding rail 125 is arranged along the Y direction and is fixedly mounted on the side surface of the second supporting rod 124; the nozzle 110 is mounted on a second slider 126, and the second slider 126 is slidably engaged with the second slide rail 125. The above-described configuration of the moving assembly 120 enables the nozzle 110 to be moved in the X-direction and the Y-direction, thereby enabling a simulation of the position changes that may occur in an actual jet in an engine combustion chamber.
The jet generating mechanism further includes an adapter 130, the adapter 130 being mounted to the moving assembly 120, the nozzle 110 being mounted to the adapter 130. As shown in fig. 8, the adaptor 130 is L-shaped, and specifically includes a vertical plate 131 and a horizontal plate 132 that are connected vertically, where the vertical plate 131 is connected to the second slider 126, and the horizontal plate 132 is provided with a plurality of first threaded through holes, and the plurality of threaded through holes are distributed in M rows and N columns, and are used for installing different types of nozzles 110. The provision of the adapter 130 serves to connect the nozzle 110 and the third slide rail, and enables mounting of different types of nozzles 110.
Optionally, the device for measuring the jet gas-liquid interface in the closed space provided by the embodiment of the invention further comprises a test platform 400 and a plurality of microphone positioning mechanisms 500. Specifically, the test platform 400 is annular, and is provided with a plurality of rows of second threaded through holes, the plurality of rows of second threaded through holes are distributed at intervals along the circumferential direction of the test platform 400, and the plurality of second threaded through holes in each row are distributed at intervals along the radial direction of the test platform 400. The lower end of the support 610 is provided with two support rods 630 extending along the X direction, the two support rods 630 are distributed at intervals in parallel along the Y direction, and the test platform 400 is fixedly mounted on the upper surfaces of the two support rods 630. The microphone positioning mechanisms 500 are distributed at intervals along the circumferential direction of the test platform 400, and are mounted on the test platform 400 in a manner of being matched with the second threaded through holes through bolts.
Specifically, as shown in fig. 2, the microphone positioning mechanism 500 includes a fourth sliding rail 510, a fourth sliding block 520, and a plurality of connecting rods 530, where the plurality of connecting rods 530 are all installed on the test platform 400 and are distributed along a radial direction of the test platform 400, the fourth sliding rail 510 is fixedly installed at an upper end of the plurality of connecting rods 530, the fourth sliding block 520 is slidably matched with the first sliding rail 122, a supporting seat 540 for supporting the first ultrasonic microphone 240 or the second ultrasonic microphone is installed on the fourth sliding block 520, and the fourth sliding block 520 drives the supporting seat 540 to slide along the fourth sliding rail 510, so that the supporting seat 540 can be adjusted to different positions.
In the calibration stage, the transparent closed field 210 and the plurality of microphone positioning mechanisms 500 are detachably mounted on the test platform 400, the plurality of microphone positioning mechanisms 500 are distributed at intervals along the circumferential direction of the transparent closed field 210, and the plurality of first ultrasonic microphones 240 are mounted on the plurality of microphone positioning mechanisms 500 in a one-to-one correspondence manner; in the application stage, the application sealing field 310 and the plurality of microphone positioning mechanisms 500 are detachably mounted on the test platform 400, the plurality of microphone positioning mechanisms 500 are distributed at intervals along the circumferential direction of the application sealing field 310 and correspond to the plurality of microphone positioning mechanisms 500 one by one in the correction stage, and the plurality of second ultrasonic microphones are mounted on the plurality of microphone positioning mechanisms 500 one by one in a corresponding manner.
The test platform 400 is configured to support and position the transparent enclosure 210 and the application enclosure 310, and the microphone positioning mechanism 500 is configured to support and adjust the first ultrasonic microphone 240 and the second ultrasonic microphone.
The control processing mechanism comprises a computer in which a data processing system is disposed for collecting and processing the ultrasonic signals and the image data of the camera 230 in the transparent enclosure 210 and the application enclosure 310. The data acquisition means is for acquiring data generated by the first ultrasonic microphone 240 or the second ultrasonic microphone at a sampling rate exceeding 3.5 MHz; the computer is used to send out synchronization signals, control the syringe pump, receive data from the data acquisition mechanism and the camera 230, and provide a computing environment for the data processing system.
Specifically, the data processing system comprises an ultrasonic signal processing system and a high-speed camera image processing system, wherein the ultrasonic signal processing system adopts different processing modes for different trigger signals, obtains the change of ultrasonic scattering signals brought by a jet flow gas-liquid interface by using a baseline reduction method for pulse sine signals and pulse Tone burst signals, then carries out amplitude and Fourier transformation on the processed signals, extracts the change of main frequency amplitude, and establishes a connection with jet flow diameter; for continuous sinusoidal signals, the change of the sound pressure amplitude of the continuous sinusoidal signals is obtained by carrying out narrow-band filtering on the received signals for a plurality of times and extracting the envelope curve, and the frequency domain information of the fluctuation of the gas-liquid interface can be obtained by carrying out Fourier analysis on the envelope curve of the sound pressure amplitude, so that the sound pressure amplitude, the fluctuation frequency, the jet diameter and the change thereof are related; for pulse abrupt change signals, mainly extracting the amplitude of multiple wave peaks, determining the position of a liquid drop through the change of time difference between the wave peaks, and also determining the change of jet diameter at the inversion position of the amplitude of a second peak; for pulse sweep signals, due to the matching relation between jet diameter and ultrasonic wave wavelength, the scattering phenomenon of jet is more obvious for the ultrasonic wave wavelength near the jet diameter, the main peaks of different frequencies can be determined by carrying out Fourier analysis on the received signals, so that the diameter of the outgoing stream can be inverted, on the other hand, the pulse sweep signals are sufficiently complex, the signal characteristics are obvious, the time difference between the two signals can be obtained by carrying out cross-correlation operation on the first area signals and the second area signals, and the jet position is determined by the time difference.
The high-speed camera image processing system provides a reference value for the ultrasonic signal by performing gray extraction pretreatment on the original image shot by the camera 230 and then extracting the change of the jet diameter of the gas-liquid interface at the ultrasonic measurement position by a sub-pixel edge detection method.
The synchronizer is a high-precision low-delay synchronous signal generating device, the delay between channels is not higher than 100ns, and the synchronizer is matched with related components to be connected with a computer, a first ultrasonic generator 220, a second ultrasonic generator 320, a first ultrasonic generator, a second ultrasonic microphone and a camera 230, so as to synchronously trigger the equipment to send and receive signals according to a set time sequence.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A device for measuring a jet gas-liquid interface in a confined space, comprising: the device comprises a jet flow generating mechanism, a correcting mechanism (200), an actual application mechanism (300), a data acquisition mechanism and a control processing mechanism, wherein the data acquisition mechanism is in signal connection with the control processing mechanism;
the correction mechanism (200) includes: the device comprises a transparent closed field (210), a first ultrasonic generator (220), a camera (230) and a plurality of first ultrasonic microphones (240) which are in signal connection with the data acquisition mechanism, wherein the first ultrasonic generator (220) and the plurality of first ultrasonic microphones (240) are arranged on the transparent closed field (210) and are distributed at intervals along the circumferential direction of the transparent closed field (210), and the camera (230) is used for shooting jet flow in the transparent closed field (210);
the utility mechanism (300) comprises: an application sealing field (310), a second ultrasonic generator (320) and a plurality of second ultrasonic microphones in signal connection with the data acquisition mechanism, wherein the second ultrasonic generator (320) and the second ultrasonic microphones are both arranged on the application sealing field (310) and are distributed at intervals along the circumferential direction of the application sealing field (310);
the control processing mechanism comprises a synchronizer, the jet flow generating mechanism is communicated with the transparent airtight field (210) in a correction stage, and the first ultrasonic generator (220), the camera (230) and a plurality of first ultrasonic microphones (240) are all in signal connection with the synchronizer;
in the application stage, the jet generating mechanism is communicated with the application sealing field (310), and the second ultrasonic generator (320) and the second ultrasonic microphone are both connected with the synchronizer in a signal manner.
2. The device for measuring the jet air-liquid interface in a closed space according to claim 1, wherein the calibration mechanism (200) further comprises a first protection component for protecting the first ultrasonic microphone (240), the first protection component being mounted to the transparent closed field (210), the first ultrasonic microphone (240) being mounted to the first protection component.
3. The apparatus for measuring jet air-liquid interface in a closed space according to claim 1, wherein said practical application mechanism (300) further comprises a second protection assembly (330) for protecting said second ultrasonic microphone, said second protection assembly (330) being mounted to said application enclosure (310), said second ultrasonic microphone being mounted to said second protection assembly (330).
4. A device for measuring a jet gas-liquid interface in a closed space according to claim 3, wherein the second protection component (330) comprises a positioning sleeve (331) and a positioner (332), the positioning sleeve (331) is fixedly sleeved at the receiving end of the second ultrasonic microphone, and is provided with a first measuring hole (333) opposite to the receiving end of the second ultrasonic microphone;
the locator (332) is sleeved on the locating sleeve (331) and is arranged on the side wall of the application sealing field (310), and the first measuring hole (333) is communicated with the application sealing field (310).
5. The device for measuring the jet gas-liquid interface in a closed space according to claim 4, wherein the side wall of the positioner (332) is provided with a cooling cavity (334) for accommodating a cooling medium.
6. The device for measuring jet gas-liquid interface in a confined space according to any of claims 1-5, wherein the jet generating means comprises a syringe pump, a nozzle (110) and a communication line, said communication line being in communication with said syringe pump and said nozzle (110), respectively, said nozzle (110) being adapted to generate a flow field into said transparent containment field (210) or said application containment field (310).
7. The apparatus for measuring jet gas-liquid interface in a confined space of claim 6 wherein said jet generating means further comprises a disturbance applicator to which said syringe pump is mounted.
8. The device for measuring the jet gas-liquid interface in the closed space according to claim 7, wherein the jet generating mechanism further comprises a moving assembly (120), the nozzle (110) is mounted on the moving assembly (120), and the moving assembly (120) is used for driving the nozzle (110) to move along the X direction and the Y direction.
9. The apparatus for measuring jet air-liquid interface in a confined space according to claim 8, wherein the jet generating mechanism further comprises an adapter (130), said adapter (130) being mounted to said moving assembly (120), said nozzle (110) being mounted to said adapter (130).
10. The device for measuring the jet gas-liquid interface in the closed space according to claim 1, wherein the device for measuring the jet gas-liquid interface in the closed space further comprises a test platform (400) and a plurality of microphone positioning mechanisms (500);
in the correction stage, the transparent closed field (210) and the microphone positioning mechanisms (500) are detachably mounted on the test platform (400), the microphone positioning mechanisms (500) are distributed at intervals along the circumferential direction of the transparent closed field (210), and the first ultrasonic microphones (240) are mounted on the microphone positioning mechanisms (500) in a one-to-one correspondence manner;
in the application stage, the application sealing field (310) and the microphone positioning mechanisms (500) are detachably mounted on the test platform (400), the microphone positioning mechanisms (500) are distributed at intervals along the circumferential direction of the application sealing field (310), the microphone positioning mechanisms are in one-to-one correspondence with the positions of the microphone positioning mechanisms (500) in the correction stage, and the second ultrasonic microphones are mounted on the microphone positioning mechanisms (500) in one-to-one correspondence.
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