Thermoacoustic signal testing device

Abstract

The thermoacoustic signal testing device provided by the utility model comprises a shell, a hollow area used for carrying a sample to be measured is arranged in the shell, and a heat insulation layer made of a transparent material is arranged in the hollow area; observation window structures are respectively arranged on two side surfaces in the center line direction of the shell, and when the to-be-measured sample reaches a preset working condition by using an optical method, an optical signal corresponding to the optical method is captured by using a high-speed camera through the observation window structures. Visual measurement is realized, and the measurement precision is guaranteed at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring devices, in particular to a testing device for thermoacoustic signals. Background Art

[0002] The thermoacoustic phenomenon of fluid is the process of mutual conversion between mechanical energy and thermal energy of fluid, which is widely present in various physical processes of fluid. When the compressibility of fluid cannot be ignored, the thermoacoustic phenomenon is more important in the flow, heat exchange and mass transfer of fluid. The thermoacoustic phenomenon of fluid has the characteristics of fast occurrence, small amplitude and easy disturbance, which puts higher requirements on the thermoacoustic phenomenon measurement device.

[0003] Existing devices for measuring thermoacoustic signals mainly measure pressure and density at a single location, and have not yet achieved visual measurement of full-field data. In addition, most experiments use copper casings or insulating materials to reduce the thermal disturbance of the environment on the fluid sample. The disadvantage is that the effect is limited when the temperature difference between the sample and the ambient temperature is large, and high-precision measurement of fluid thermoacoustic phenomena cannot be achieved. Utility Model Content

[0004] In view of this, the test device for thermoacoustic signals provided by the utility model solves the technical problems of low measurement accuracy and inability to achieve visual measurement of devices in the prior art.

[0005] A test device for thermoacoustic signals, suitable for measuring parameters of a sample to be measured, comprising a shell, a hollow area for carrying the sample to be measured is arranged in the shell, and a heat insulation layer made of a transparent material is arranged in the hollow area;

[0006] Observation window structures are respectively arranged on the two side surfaces in the center line direction of the shell. When an optical method is used to make the sample to be measured reach a preset working condition, a high-speed camera is used to capture the optical signal corresponding to the optical method through the observation window structure.

[0007] Preferably or optionally, a pipeline is provided on the side adjacent to the observation window structure, one end of the pipeline is connected to the hollow area, and the other end is connected to the sample supply device, and the sample to be measured is provided to the hollow area or the sample to be measured in the hollow area is recovered through the pipeline.

[0008] Preferably or optionally, it also includes a first terminal arranged on the side adjacent to the observation window structure, one end of the first terminal is communicatively connected to an external measuring device, and the other end is provided with a first lead, one end of the first lead passes through the shell and the insulation layer in a sealed manner in sequence and contacts with the sample to be measured, and the parameters of the sample to be measured are measured in real time by the measuring device.

[0009] Preferably or optionally, it further comprises a second terminal arranged on the side adjacent to the observation window structure, the shape of the heat insulating layer is adapted to the shape of the hollow area, and a heating element is arranged on the inner end surface of the heat insulating layer adjacent to the second terminal, wherein:

[0010] One end of the second terminal is electrically connected to an external power supply device, and the other end is provided with a second lead. One end of the second lead passes through the shell and the insulation layer in a sealed manner in sequence and is electrically connected to the heating element. The state parameters of the sample to be measured can be adjusted through the heating element.

[0011] Beneficial Effects

[0012] By providing a heat-insulating layer in the hollow area instead of the traditional method of using a copper shell or insulation material, the thermal disturbance of the environment on the fluid sample is reduced, the measurement accuracy is improved, and visual measurement is achieved through the provided observation window structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 is a front sectional view of the shell;

[0015] Figure 2 It is a side sectional view after the shell is rotated 90°;

[0016] Figure 3 is a schematic diagram of the observation window, where

[0017] 1. Shell; 2. Sample to be measured; 3. Heat insulation layer; 41. First terminal; 42. Second terminal; 5. Heat generating element; 6. First lead; 7. Pipeline; 8. Observation window; 9. Second lead. DETAILED DESCRIPTION

[0018] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0019] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0020] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0021] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The drawings only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0022] like Figures 1 to 3 The test device for thermoacoustic signals shown is suitable for measuring parameters of a sample to be measured, and the sample to be measured is gas or fluid, preferably fluid. It includes a shell 1 made of materials such as stainless steel or aluminum alloy, and a hollow area for carrying a sample to be measured 2 is provided in the shell 1. The shape of the hollow area is, for example, rectangular or cylindrical, and a heat insulation layer 3 made of a transparent material is continuously arranged in the hollow area, the purpose of which is to reduce the thermal disturbance of the environment and improve the accuracy of the measurement of the sample to be measured 2;

[0023] Observation window structures are respectively arranged on the two side surfaces in the center line direction of the housing 1. When the optical method is used to make the sample 2 to be measured reach the preset working condition, a high-speed camera is used to capture the optical signal corresponding to the optical method through the observation window structure. By arranging a heat insulation layer in the hollow area instead of the traditional method of using a copper shell or insulation material, the thermal disturbance of the environment to the fluid sample is reduced, thereby improving the measurement accuracy, and visual measurement is achieved through the arranged observation window structure.

[0024] As a specific implementation provided in this case, a pipeline 7 is provided on the side adjacent to the observation window structure, that is, a pipeline 7 is provided on the side adjacent to the side where the observation window structure is provided. One end of the pipeline 7 is connected to the hollow area, and the other end is connected to the sample supply device, and the sample to be measured is provided to the hollow area or recovered in the hollow area through the pipeline 7. It should be pointed out that the pipeline 7 and the leads mentioned below are all sealed and installed on the housing 1, such as by using epoxy resin or heat-insulating silicone for sealing.

[0025] As a specific implementation provided in this case, it also includes a first terminal 41 arranged on the side adjacent to the observation window structure, one end of the first terminal 41 is communicatively connected to an external measuring device, and the other end is provided with a first lead 6, one end of the first lead 6 passes through the shell 1 and the insulation layer 3 in sequence in a sealed manner and contacts with the sample to be measured, and the parameters of the sample to be measured are measured in real time by the measuring device.

[0026] Furthermore, it also includes a second terminal 42 arranged on the side adjacent to the observation window structure, the shape of the heat insulation layer 3 is adapted to the shape of the hollow area, and a heating element 5 is arranged on the inner end surface of the heat insulation layer 3 adjacent to the second terminal 42, and the heating element 5 is, for example, a heating plate or a resistor or other electronic components that can generate heat. One end of the second terminal 42 is electrically connected to an external power supply device (a constant voltage and constant current power supply that can control the intensity and excitation time of the thermal sound), and the other end is provided with a second lead 9, one end of the second lead 9 passes through the housing 1 and the heat insulation layer 3 in a sealed manner and is electrically connected to the heating element 5, and the state parameters of the sample to be measured can be adjusted to reach a steady state through the heating element 5, and according to the derivation of the one-dimensional heat conduction problem for the plane, the heat leakage rate principle of the test section is obtained, and the temperature of the sample is controlled by the power supply device, then the sample is subjected to less thermal disturbance, meeting the measurement requirements of high precision and low disturbance.

[0027] It should be pointed out that the above-mentioned second terminal 42, first terminal 41 and pipeline 7 do not block the observation window structure, and their respective setting surfaces need to be staggered. Generally, for the purpose of aesthetic appearance, the second terminal 42, first terminal 41 and pipeline 7 are arranged on different sides of the shell 1, on the side of the shell 1 where the observation window structure is not arranged.

[0028] As a specific embodiment provided in this case, the heat insulation layer 3 is made of a hard and smooth transparent material, such as polymethyl methacrylate or polyethersulfone, etc. The heat insulation layer 3 is fixed to the inner wall of the shell 1 by adhesives or the like to reduce the thermal disturbance of the environment and improve the measurement accuracy. The sides of the shell 1 where the observation window structure is set are made of light-transmitting materials or the entire shell 1 is made of light-transmitting materials. When the schlieren method and laser interference are used, light can pass through the shell 1.

[0029] As a specific implementation provided in this case, the observation window structure includes an observation window 8, which is made of tempered glass or sapphire glass. The observation window 8 is installed on the shell 1 in a sealed manner, such as a sealing ring or epoxy resin. The inner side of the observation window 8 is in contact with the outer side of the insulation layer 3. The insulation layer 3 is made of a transparent material and does not affect the shooting of the high-speed camera.

[0030] Furthermore, the observation window structure also includes a T-shaped slot provided on the housing 1 , the observation window 8 is installed at the large end of the T-shaped slot and the small end of the T-shaped slot serves as an optical channel for high-speed camera shooting.

[0031] Workflow:

[0032] 1. After the housing 1 is connected to the matching measuring device, power supply equipment or system, the sample 2 to be measured is delivered through the sample supply device;

[0033] 2. The power supply equipment works to control the parameters of the sample 2 to be measured so that its temperature and pressure reach the planned working conditions and stabilize;

[0034] 3. After the state of the measured sample 2 is stable, close the isolation valve on the sample supply device to isolate the sample supply device from the outside world;

[0035] 4. After the fluid state is stable, a certain amount of heat is input into the sample 2 to be measured by controlling the power and time of the power supply device, as a thermal disturbance to excite the fluid thermoacoustics;

[0036] 5. After the thermoacoustic excitation, the parameter changes of the fluid subjected to thermal disturbance in the acoustic time scale are recorded through the first lead 6, that is, the changes of the temperature and pressure of the sample after the thermal disturbance are recorded through the first lead 6;

[0037] 6. After thermoacoustic excitation, optical methods (including but not limited to schlieren method, laser interferometry, etc.) are used through the observation window 8 to visualize the density change of the measured sample 2 after thermal disturbance, and the optical signal is captured using a high-speed camera interferometer measurement platform.

[0038] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A thermoacoustic signal testing device, suitable for measuring parameters of a sample to be measured, characterized in that: It comprises a shell (1), wherein a hollow area for carrying the sample to be measured is provided in the shell (1), and a heat insulation layer (3) made of a transparent material is provided in the hollow area; Observation window structures are respectively arranged on two side surfaces in the center line direction of the housing (1); when an optical method is used to make the sample to be measured reach a preset working condition, a high-speed camera is used to capture an optical signal corresponding to the optical method through the observation window structure.

2. The test device according to claim 1, characterized in that: A pipeline (7) is arranged on the side adjacent to the observation window structure, one end of the pipeline (7) is connected to the hollow area, and the other end is connected to the sample supply device, and the sample to be measured is provided to the hollow area or recovered from the hollow area through the pipeline (7).

3. The test device according to claim 1, characterized in that: The invention also comprises a first terminal (41) arranged on a side surface adjacent to the observation window structure, one end of the first terminal (41) being communicatively connected to an external measuring device, and the other end being provided with a first lead wire (6), one end of the first lead wire (6) passing through the housing (1) and the heat insulation layer (3) in sequence in a sealed manner and contacting with a sample to be measured, so that the parameters of the sample to be measured can be measured by the measuring device.

4. The test device according to claim 1, characterized in that: It also includes a second terminal (42) arranged on a side surface adjacent to the observation window structure, the shape of the heat insulation layer (3) is adapted to the shape of the hollow area, and a heating element (5) is arranged on the inner end surface of the heat insulation layer (3) adjacent to the second terminal (42), wherein: One end of the second terminal (42) is electrically connected to an external power supply device, and the other end is provided with a second lead (9), one end of the second lead (9) passes through the housing (1) and the heat insulation layer (3) in sequence in a sealed manner and is electrically connected to the heating element (5), and the state parameters of the sample to be measured can be adjusted through the heating element (5).

5. The test device according to claim 1, characterized in that: The heat insulation layer (3) is made of a hard material with a smooth surface.

6. The test device according to claim 5, characterized in that: The material of the heat insulation layer (3) is polymethyl methacrylate or polyether sulfone.

7. The test device according to claim 1, characterized in that: The side surfaces of the housing (1) on which the observation window structure is arranged are made of light-transmitting material.

8. The test device according to claim 1, characterized in that: The observation window structure comprises an observation window (8), wherein the observation window (8) is mounted on the shell (1) in a sealed manner, and the inner side surface of the observation window (8) is in contact with the outer side surface of the heat insulation layer (3).

9. The test device according to claim 8, characterized in that: The observation window structure also includes a T-shaped slot arranged on the housing (1), the observation window (8) being mounted at the large end of the T-shaped slot and the small end of the T-shaped slot serving as a light channel for high-speed camera shooting.

10. The test device according to claim 9, characterized in that: The observation window (8) is made of tempered glass or sapphire glass.

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