Nano-bubble fuel atomization test system and test method

Abstract

The invention provides a nanobubble fuel atomization test system and test method, and relates to the technical field of fluid atomization tests. Comprising a liquid box, a nano-bubble preparation device, a nano-bubble liquid box, a nozzle, a three-axis displacement system, a high-pressure gas device, a bubble measuring instrument and a particle size measuring instrument. The liquid box, the nano-bubble preparation device and the nano-bubble liquid box are sequentially connected, the nano-bubble liquid box is connected with the nozzle and the three-axis displacement system, the nano-bubble preparation device and the nano-bubble liquid box are both connected with the high-pressure gas device, the nano-bubble liquid box is further connected with the bubble measuring instrument, and the particle size measuring instrument is arranged at an outlet of the nozzle. In addition, a switching valve, a control valve, a flow meter, a sampling valve and the like are arranged at the joint. According to the invention, the full-link test content from nano-bubble liquid preparation, atomization to measurement is realized, the concentration and particle size of the nano-bubbles can be changed for repeated tests, and the particle size and concentration measurement of the nano-bubbles and the particle size measurement of liquid atomization are realized at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid atomization testing, and in particular to a nano bubble fuel atomization testing system and a testing method. Background Art

[0002] As a conventional fuel for gas turbines, oil-based liquid fuels typically require a significant proportion of deionized water to meet NOx emission requirements, which in turn impacts operating costs and overall turbine efficiency. To reduce oil-based fuel's dependence on water and lower gas turbine operating costs, a leading concept involves pre-injecting nanoscale air bubbles into the water. Currently, the mechanism of nanobubble formation remains unclear, making it impossible to analyze the properties of liquid fuels after nanobubble addition through numerical analysis. Experimental methods are the only means by which the properties of nanobubble-based liquids can be studied.

[0003] In order to explore the atomization enhancement effect of the liquid after adding nanobubbles, it is necessary to build a nanobubble fuel atomization test bench. The traditional atomization test bench is only suitable for conventional fuels and is not very suitable for liquids containing nanobubbles. In addition, nanobubbles have problems such as short residence time. In order to solve the problem of nanobubble liquid atomization, it is necessary to design and build a nanobubble atomization test system.

[0004] Existing patent CN112345257A discloses a test platform for rocket engine nozzle atomization testing. This test platform overcomes the defects of previous engine supply systems such as large scale and high risk. At the same time, the test platform does not involve open flame combustion process, making it easier for researchers to conduct nozzle atomization tests.

[0005] Existing patent CN119395252A discloses a device for testing the atomization characteristics of alternative aviation fuels in a low-temperature, low-pressure environment. The invention uses a high-pressure airflow to rotate at high speed through a cyclone to achieve efficient atomization of the nozzle; at the same time, a constant-volume bomb with low-temperature, low-pressure conditions is created through a multi-stage refrigeration and exhaust device to simulate actual working conditions and obtain atomization characteristic data.

[0006] In summary, the above-mentioned existing patents all aim to solve the problem in the prior art that experimental means are required to study the atomization characteristics of nanobubble liquids. Summary of the Invention

[0007] Based on the above technical problems, the present invention proposes a nanobubble fuel atomization test system and test method to solve the problem that in the prior art, experimental means are required to be used to study the atomization characteristics of nanobubble liquids.

[0008] To achieve the above objectives, the present invention proposes a nanobubble fuel atomization test system and test method. The specific technical solution is as follows:

[0009] A nanobubble fuel atomization test system comprises a liquid tank, a nanobubble preparation device, a nanobubble liquid tank, a nozzle, and a triaxial displacement system, which are connected in sequence. The system also comprises a high-pressure gas device connected to the nanobubble preparation device and the nanobubble liquid tank, a bubble measuring instrument connected to the nanobubble liquid tank, and a particle size measuring instrument disposed at the nozzle outlet. The nanobubble liquid in the nanobubble liquid tank is pressurized by different pressurization methods and then flows toward the nozzle and the triaxial displacement system.

[0010] Furthermore, the nanobubble liquid tank is provided with a first liquid outlet and a second liquid outlet, and the first liquid outlet and the second liquid outlet are both connected to the nozzle and the three-axis displacement system.

[0011] Furthermore, it includes a third switching valve and a first flow meter which are sequentially connected between the first liquid outlet, the nozzle and the three-axis displacement system.

[0012] Furthermore, it includes a fourth switching valve, a high-pressure water pump and a second flow meter which are sequentially connected between the second liquid outlet and the nozzle and the three-axis displacement system. A branch is provided after the second flow meter, and a pressure gauge is connected to the branch.

[0013] Furthermore, it also includes a first sampling valve, which is connected to the sampling branch after the first flow meter, and the first sampling valve is connected to the bubble measuring instrument.

[0014] Furthermore, it also includes a second sampling valve, which is connected to the sampling branch after the second flow meter, and the second sampling valve is connected to the bubble measuring instrument.

[0015] Furthermore, it also includes a first switching valve and a second switching valve, wherein the first switching valve is connected between the nanobubble production device and the liquid tank, the second switching valve is connected between the nanobubble production device and the nanobubble liquid tank, and the first switching valve is connected to the fourth switching valve.

[0016] Furthermore, the high-pressure gas device includes a high-pressure oxygen cylinder and a high-pressure nitrogen cylinder. The high-pressure oxygen cylinder is connected to the nanobubble preparation device through a first control valve and a second pressure reducing valve, and the high-pressure nitrogen cylinder is connected to the nanobubble liquid tank through a second control valve and a second pressure reducing valve.

[0017] Furthermore, it also includes a waste liquid collection device arranged at the nozzle outlet, and the waste liquid collection device includes a waste liquid collection box and a waste exhaust system and a waste liquid outflow pipe connected to the waste liquid collection box.

[0018] The present invention also provides a nanobubble fuel atomization test method, which uses the above-mentioned nanobubble fuel atomization test system and includes:

[0019] preparing a nanobubble liquid by a nanobubble preparation device;

[0020] The nanobubble liquid flows into the nanobubble liquid tank and is ejected through the nozzle after being pressurized;

[0021] The pressurized nanobubble liquid is sampled and its concentration and particle size are measured;

[0022] Measure the liquid spray particle size at the nozzle outlet;

[0023] Collect the waste liquid through the waste liquid collection device and discharge it;

[0024] Based on the above measurement results, the influence of the concentration and particle size of the nanobubble liquid on the liquid spray particle size is analyzed.

[0025] Furthermore, the nanobubble liquid flows into the nanobubble liquid tank and is pressurized before being ejected through the nozzle, which includes: the nanobubble liquid flows into the nanobubble liquid tank and at the same time the high-pressure nitrogen cylinder is opened, and the nanobubble liquid is pressurized and then ejected from the nozzle through the first liquid outlet of the nanobubble liquid tank, the third switching valve and the first flow meter.

[0026] Furthermore, the nanobubble liquid flows into the nanobubble liquid tank and is pressurized before being ejected through the nozzle, which includes: the nanobubble liquid flows into the nanobubble liquid tank and is ejected from the nozzle through the second liquid outlet of the nanobubble liquid tank, the fourth switching valve, the high-pressure water pump and the second flow meter.

[0027] Furthermore, after the nanobubble liquid enters the nanobubble liquid tank, the first switching valve and the fourth switching valve are controlled to form a closed loop between the nanobubble production device and the nanobubble liquid tank.

[0028] Furthermore, the waste liquid is collected and discharged by the waste liquid collection device, including: the liquid spray at the nozzle outlet is collected by the waste liquid collection box, the waste liquid flows to the drainage system through the waste liquid outflow channel, and the waste gas generated by the nanobubbles being broken is extracted through the waste exhaust system.

[0029] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0030] 1. The present invention proposes a nanobubble fuel atomization test system and test method, which can realize a full-link test system of nanobubble liquid generation, atomization, and measurement.

[0031] 2. The present invention proposes a nanobubble fuel atomization test system and test method, the connection mode of which can change the concentration and particle size of the bubbles.

[0032] 3. The nanobubble fuel atomization test system and test method proposed in the present invention provide two ways to pressurize the nanobubble liquid.

[0033] 4. The nanobubble fuel atomization test system and test method proposed in the present invention can simultaneously realize the liquid atomization particle size measurement and the nanobubble particle size and concentration measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0035] Figure 1 This is a schematic diagram of the framework of a nanobubble fuel atomization test system proposed in the present invention;

[0036] Figure 2 This is a schematic flow chart of a nanobubble fuel atomization test method proposed in the present invention.

[0037] Figure numerals: 1-liquid tank, 2-first switching valve, 3-nanobubble preparation device, 4-second switching valve, 5-nanobubble liquid tank, 6-pressure relief valve, 7-third switching valve, 8-first flow meter, 9-nozzle and three-axis displacement system, 10-high-pressure gas device, 11-first control valve, 12-first pressure reducing valve, 13-second control valve, 14-second pressure reducing valve, 15-fourth switching valve, 16-high-pressure water pump, 17-second flow meter, 18-pressure gauge, 19-second sampling valve, 20-first sampling valve, 21-bubble measuring instrument, 22-waste liquid collection tank, 23-waste exhaust system, 24-waste liquid outflow pipe, 25-particle size measuring instrument. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to specific examples. These examples should not be construed as limiting the scope of protection claimed in the present invention.

[0039] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] In order to solve the problem that the existing technology requires experimental means to study the atomization characteristics of nanobubble liquids, the present invention proposes a nanobubble fuel atomization test system and test method, which can realize the full-link test content from nanobubble solution preparation, atomization to measurement.

[0041] Example 1

[0042] This embodiment proposes a nanobubble fuel atomization test system, see Figure 1 As shown, the system includes a liquid tank 1, a nanobubble production device 3, a nanobubble liquid tank 5, a nozzle and a triaxial displacement system 9, a high-pressure gas device 10, a bubble meter 21, and a laser particle size meter 25. The liquid tank 1, nanobubble production device 3, and nanobubble liquid tank 5 are sequentially connected. The nanobubble liquid tank 5 is also connected to the nozzle and the triaxial displacement system 9. The nanobubble production device 3 and the nanobubble liquid tank 5 are both connected to the high-pressure gas device 10, which is also connected to the bubble meter 21. The particle size meter 25 is located at the nozzle outlet. The high-pressure gas device 10 includes a high-pressure oxygen cylinder and a high-pressure nitrogen cylinder.

[0043] Optionally, the liquid tank 1 is pre-injected with liquid that needs to be atomized by nanobubbles, and the liquid types include deionized water, liquid fuel, or other types of liquids.

[0044] Specifically, the nanobubble preparation device 3 is provided with a liquid inlet, a gas medium inlet and a nanobubble liquid outlet. The liquid inlet and the liquid tank 1 are connected via a first switching valve 2, the gas medium inlet and the high-pressure oxygen cylinder are connected via a first control valve 11 and a first pressure reducing valve 12, and the nanobubble liquid outlet and the nanobubble liquid tank 5 are connected via a second switching valve 4.

[0045] Specifically, the nanobubble liquid tank 5 is provided with a nanobubble liquid inlet, a gas medium access port, a pressure reducing interface, a first liquid outlet and a second liquid outlet. The nanobubble liquid inlet and the nanobubble preparation device 3 are connected via a second switching valve 4, the gas medium inlet and the high-pressure nitrogen cylinder are connected via a second control valve 13 and a second pressure reducing valve 14, the pressure reducing interface is connected to a pressure relief valve 6, the first liquid outlet is connected to the nozzle and the three-axis displacement system 9 via a third switching valve 7 and a first flowmeter 8, a branch is provided after the first flowmeter 8, the branch is connected to a first sampling valve 20, and the first sampling valve 20 is connected to a bubble measuring instrument 21.

[0046] A fourth switching valve 15, a high-pressure water pump 16, and a second flowmeter 17 are sequentially connected between the second liquid outlet, the nozzle, and the triaxial displacement system 9. Two branches are provided after the second flowmeter 17. One branch is connected to a pressure gauge 18, and the other branch is connected to a second sampling valve 19. The second sampling valve 19 is connected to a bubble meter 21. Furthermore, the first switching valve 2 is connected to the fourth switching valve 15.

[0047] Specifically, a particle size meter 25 and a waste liquid collection device are installed at the nozzle outlet of the nozzle and triaxial displacement system 9. The particle size meter 25 includes a laser, an ICCD camera, and an image acquisition and processing device. The laser generates a laser beam of a specific wavelength and power. When the laser beam strikes the nanobubbles in the spray, the bubbles scatter light. The intensity and angular distribution of the scattered light are closely related to the bubble size. The ICCD camera includes an ultraviolet lens, an image intensifier, and a CCD camera. A filter is placed in front of the ultraviolet lens to filter light of a specific wavelength to reduce background noise and other interfering light, ensuring that only scattered light relevant to the measurement is detected, thereby improving measurement accuracy and reliability. The ultraviolet lens focuses and collects scattered light. The image intensifier amplifies weak light signals, amplifying the intensity of scattered light and making it more easily detected by the detector. The CCD acts as a photodetector, converting scattered light signals into electrical signals for computer processing. The image acquisition and processing device is connected to the ICCD camera to control the ICCD camera, collect data, and process and analyze the measurement results. The waste liquid collection device includes a waste liquid collection box 22 and a waste exhaust system 23 and a waste liquid outflow pipe 24 connected thereto.

[0048] Example 2

[0049] This embodiment provides a nanobubble fuel atomization test method, which uses the nanobubble fuel atomization test system provided in Example 1. Figure 2 As shown, the test method includes the following steps:

[0050] Nanobubble liquid is generated in a nanobubble preparation device using liquid in a liquid tank and compressed gas in a high-pressure oxygen cylinder;

[0051] The nanobubble liquid flows into the nanobubble liquid tank and is ejected through the nozzle after being pressurized;

[0052] The pressurized nanobubble liquid is sampled and its concentration and particle size are measured;

[0053] The spray particle size is measured at the nozzle outlet by a laser particle size measuring instrument;

[0054] Collect the waste liquid through the waste liquid collection device and discharge it;

[0055] Based on the above measurement results, the influence of the concentration and particle size of the nanobubble liquid on the liquid spray particle size is analyzed.

[0056] The above-mentioned process of generating nanobubble liquid is as follows:

[0057] Specifically, liquid is pre-filled into the liquid tank 1, the first switching valve 2 is opened, and the liquid flows into the nanobubble production device 3. At the same time, the first control valve 11 is opened, and the compressed gas in the high-pressure oxygen cylinder is passed into the nanobubble production device 3. The first switching valve 2 and the first control valve 11 are closed, and the nanobubble production device 3 uses the liquid and compressed gas to produce nanobubble liquid.

[0058] The process of the nanobubble liquid flowing into the nanobubble liquid tank and being pressurized and then ejected through the nozzle is as follows:

[0059] Specifically, the second switching valve 4 is opened, allowing the nanobubble liquid to flow through it into the nanobubble liquid tank 5. Simultaneously, the second control valve 13 is opened, allowing high-pressure nitrogen to flow into the nanobubble liquid tank 5. This high-pressure nitrogen pressurizes the nanobubble liquid to the desired pressure, increasing the solubility of the gas in the liquid and promoting the formation and stabilization of nanobubbles. The second switching valve 4 and the second control valve 13 are closed, and the third switching valve 7 is opened. The stabilized nanobubble liquid passes through the third switching valve 7 and the first flowmeter 8 and is ejected from the nozzle, forming a liquid spray. The three-axis displacement system precisely controls the three-dimensional spatial position and angle of the nozzle, ensuring accurate spray direction and location.

[0060] In other embodiments, after the nanobubble liquid flows through the second switching valve 4 into the nanobubble liquid tank 5, the pressure reducing valve 6 and the fourth switching valve 15 are opened, and the nanobubble liquid flows out of the fourth switching valve 15. The nanobubble liquid is pressurized by the high-pressure water pump 16, passes through the second flow meter 17, and is sprayed from the nozzle. A pressure gauge 18 provides the pressure before spraying after the pump.

[0061] In this process, the opening and closing of the first switching valve 2 and the third manual switching valve 15 can be controlled to form a closed loop with the nanobubble preparation device 3 and the nanobubble liquid tank 5. The concentration and particle size of the nanobubble liquid can be changed through continuous circulation, thereby performing multiple tests.

[0062] The above-mentioned process of sampling the pressurized nanobubble liquid and measuring its concentration and particle size is as follows:

[0063] Specifically, the first sampling valve 20 or the second sampling valve 19 is opened, and part of the nanobubble liquid flows into the bubble measuring instrument 21 through the first flowmeter 8 or the second flowmeter 17. The first sampling valve 20 and the second sampling valve 19 are closed, and the nanobubble concentration and nanobubble particle size in the nanobubble liquid are measured by the bubble measuring instrument 21.

[0064] The above-mentioned process of measuring the spray particle size at the nozzle outlet by using a laser particle size measuring instrument is as follows:

[0065] Specifically, the nanobubble liquid forms a spray after being ejected from the nozzle, and the laser particle size measuring instrument 25 located at the nozzle outlet measures the spray particle size.

[0066] The above-mentioned process of collecting and discharging waste liquid through the waste liquid collection box is as follows:

[0067] Specifically, the nanobubble liquid is sprayed out and collected by the waste liquid collection box 22 , and the waste liquid flows to the drainage system through the waste liquid outflow channel 24 , and the waste gas generated by the nanobubble breaking is extracted through the waste exhaust system 23 .

[0068] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0069] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0070] It should be noted that, in the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

Claims

1. A nanobubble fuel atomization test system, characterized by: The invention comprises a liquid tank, a nanobubble preparation device, a nanobubble liquid tank and a nozzle, and a three-axis displacement system connected in sequence, and further comprises a high-pressure gas device connected to the nanobubble preparation device and the nanobubble liquid tank, a bubble measuring instrument connected to the nanobubble liquid tank, and a particle size measuring instrument arranged at the nozzle outlet. The nanobubble liquid in the nanobubble liquid tank is pressurized by different pressurization methods and then flows to the nozzle and the three-axis displacement system.

2. The nanobubble fuel atomization test system according to claim 1, characterized in that: The nanobubble liquid tank is provided with a first liquid outlet and a second liquid outlet, and the first liquid outlet and the second liquid outlet are both connected to the nozzle and the three-axis displacement system.

3. The nanobubble fuel atomization test system according to claim 2, characterized in that: The invention comprises a third switching valve and a first flow meter which are sequentially connected between the first liquid outlet, the nozzle and the three-axis displacement system.

4. The nanobubble fuel atomization test system according to claim 3, characterized in that: It includes a fourth switching valve, a high-pressure water pump and a second flow meter which are sequentially connected between the second liquid outlet, the nozzle and the three-axis displacement system. A branch is provided after the second flow meter, and a pressure gauge is connected to the branch.

5. The nanobubble fuel atomization test system according to claim 3, characterized in that: The device further comprises a first sampling valve, wherein the first sampling valve is connected to the sampling branch after the first flow meter, and the first sampling valve is connected to the bubble measuring instrument.

6. The nanobubble fuel atomization test system according to claim 4, characterized in that: The system further comprises a second sampling valve, wherein the second sampling valve is connected to the sampling branch after the second flow meter, and the second sampling valve is connected to the bubble measuring instrument.

7. The nanobubble fuel atomization test system according to claim 4, characterized in that: The device further includes a first switching valve and a second switching valve, wherein the first switching valve is connected between the nanobubble generating device and the liquid tank, the second switching valve is connected between the nanobubble generating device and the nanobubble liquid tank, and the first switching valve is connected to the fourth switching valve.

8. The nanobubble fuel atomization test system according to claim 1, characterized in that: The high-pressure gas device includes a high-pressure oxygen cylinder and a high-pressure nitrogen cylinder. The high-pressure oxygen cylinder is connected to the nanobubble production device through a first control valve and a second pressure reducing valve, and the high-pressure nitrogen cylinder is connected to the nanobubble liquid tank through a second control valve and a second pressure reducing valve.

9. The nanobubble fuel atomization test system according to claim 1, characterized in that: It also includes a waste liquid collection device arranged at the nozzle outlet, and the waste liquid collection device includes a waste liquid collection box and a waste exhaust system and a waste liquid outflow pipe connected to the waste liquid collection box.

10. A nanobubble fuel atomization test method, the method using the nanobubble fuel atomization test system according to any one of claims 1 to 9, characterized in that: The method comprises: preparing a nanobubble liquid by a nanobubble preparation device; The nanobubble liquid flows into the nanobubble liquid tank and is ejected through the nozzle after being pressurized; The pressurized nanobubble liquid is sampled and its concentration and particle size are measured; Measure the liquid spray particle size at the nozzle outlet; Collect the waste liquid through the waste liquid collection device and discharge it; Based on the above measurement results, the influence of the concentration and particle size of the nanobubble liquid on the liquid spray particle size is analyzed.

11. The nanobubble fuel atomization test method according to claim 10, characterized in that: The nanobubble liquid flows into the nanobubble liquid tank and is pressurized before being ejected through the nozzle, which includes: the nanobubble liquid flows into the nanobubble liquid tank and at the same time the high-pressure nitrogen cylinder is opened, and the pressurized nanobubble liquid is ejected from the nozzle through a first liquid outlet of the nanobubble liquid tank, a third switching valve, and a first flow meter.

12. The nanobubble fuel atomization test method according to claim 10, characterized in that: The nanobubble liquid flows into the nanobubble liquid tank, is pressurized, and then is ejected through the nozzle, which includes: the nanobubble liquid flows into the nanobubble liquid tank, passes through the second liquid outlet of the nanobubble liquid tank, the fourth switching valve, the high-pressure water pump, and the second flow meter, and is ejected from the nozzle.

13. The nanobubble fuel atomization test method according to claim 11 or 12, characterized in that: After the nanobubble liquid enters the nanobubble liquid tank, the first switching valve and the fourth switching valve are controlled to form a closed loop between the nanobubble production device and the nanobubble liquid tank.

14. The nanobubble fuel atomization test method according to claim 10, characterized in that: The waste liquid is collected and discharged by the waste liquid collection device, including: the liquid spray at the nozzle outlet is collected by the waste liquid collection box, the waste liquid flows to the drainage system through the waste liquid outflow channel, and the waste gas generated by the nanobubbles being broken is extracted through the waste exhaust system.

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