Pulsed periodic oscillating micro-bubble bubble augmented aeration system and method of use

Abstract

The application discloses a pulse periodic oscillation micro-porous bubble synergistic aeration system and an application method thereof. The synergistic aeration system comprises a gas supply source, a valve connected to the downstream of the gas supply source in sequence through a pipeline, a pressure stabilizing filter, a flow meter, a pulse oscillation device, a micro-porous aeration coil connected to the outlet of the pulse oscillation device and an aeration tank. The pulse oscillation device comprises an air inlet unit connected to the downstream of the flow meter and a pulse oscillation unit located at the downstream of the air inlet unit. The application introduces a controlled pulsating oscillation airflow into the micro-porous aeration system, introduces periodic disturbance in the bubble generation stage, and then controls the generation process of the orifice bubble through the unsteady airflow, so that the dispersion effect of the gas in the liquid is improved, smaller and more uniform bubbles are generated, the refinement degree of the bubbles is improved, the gas-liquid contact efficiency is improved, the performance of the aeration system is optimized, and the cost and equipment energy consumption are greatly saved.

Description

Technical Field

[0001] The present invention relates to the field of aeration technology, and in particular to a pulse periodic oscillation microporous bubble synergistic aeration system and an application method thereof. Background Art

[0002] Currently, microporous aeration technology is widely used in wastewater treatment, particularly in biological treatment, advanced treatment, and lake water quality improvement. This technology injects gas into water in the form of tiny bubbles through a microporous aerator, significantly improving oxygen solubility and mass transfer efficiency. The large surface area of ​​these tiny bubbles allows for ample contact between oxygen and organic matter in the water, accelerating biodegradation. However, practical applications of microporous bubbling technology present challenges such as oversized bubbles, uneven bubbles, low aeration efficiency, and complex microporous aeration equipment, necessitating targeted design. Summary of the Invention

[0003] The present invention provides a pulse periodic oscillation microporous bubble synergistic aeration system and its application method, which are used to solve technical problems such as how to break the steady state of bubble generation in microporous aeration, how to conveniently achieve periodic pulsation of airflow, and how to generate uniform and controllable microbubbles to enhance aeration efficiency.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The pulse periodic oscillation microporous bubble synergistic aeration system comprises an air supply source, a valve, a pressure-stabilizing filter, a flow meter, and a pulse oscillation device connected in sequence downstream of the air supply source through a pipeline, a microporous aeration coil connected to the outlet of the pulse oscillation device, and an aeration tank; the microporous aeration coil is arranged at the bottom of the aeration tank;

[0006] The pulse oscillation device comprises an air intake unit connected to the downstream of the flow meter and a pulse oscillation unit located downstream of the air intake unit;

[0007] The air intake unit comprises an air inlet and a throat arranged downstream of the air inlet;

[0008] The pulse oscillation unit includes a diverter section located downstream of the throat, a first pulse oscillation cavity located on one side of the diverter section, a first outlet flow channel and a first air outlet provided at the middle and lower part of the first pulse oscillation cavity, a second pulse oscillation cavity located on the other side of the diverter section, and a second outlet flow channel and a second air outlet provided at the middle and lower part of the second pulse oscillation cavity;

[0009] The split section, the first pulse oscillation cavity and the second pulse oscillation cavity together form a herringbone oscillation cavity.

[0010] Furthermore, the air inlet is set to be circular and is connected to the upstream pipeline accordingly; the radius of the air inlet is greater than the width of the throat.

[0011] Further, the throat is a linear tapering channel, and a circular arc segment is arranged at the connection with the air inlet; the radius of the air inlet is 4-8 times the width of the end of the throat; and the radius of the circular arc segment is 2-3 times the width of the end of the throat.

[0012] Further, the split-pivot segment is angular and a concave arc surface is arranged at the vertex angle, the length of the concave arc surface is 1-3 times the width of the end of the throat, and the radius of the concave arc surface is 0.2-2 times the width of the end of the throat.

[0013] The length of the split-pivot segment from the nozzle of the throat is the length of the split-pivot front, and the length of the split-pivot front is 4-10 times the width of the end of the throat.

[0014] Further, the first pulse oscillation cavity and the second pulse oscillation cavity are both linear expansion cavities.

[0015] The angle between the outer side of the first pulse oscillation cavity and the horizontal line is a third angle, the angle between the inner side of the first pulse oscillation cavity and the horizontal line is a fourth angle, the angle between the inner side of the second pulse oscillation cavity and the horizontal line is a fifth angle, and the angle between the outer side of the second pulse oscillation cavity and the horizontal line is a sixth angle.

[0016] The third angle and the sixth angle are both 18-22 degrees, and the fourth angle and the fifth angle are both 13-17 degrees.

[0017] Further, the distance from the connection between the first pulse oscillation cavity and the first air outlet flow channel to the end of the throat is a first front end length, and the first front end length is 4-6 times the length of the split-pivot front.

[0018] The distance from the connection between the first pulse oscillation cavity and the first air outlet flow channel to the end of the first pulse oscillation cavity is a first rear end length, and the first rear end length is 0.7-1.5 times the first front end length.

[0019] The distance from the connection between the second pulse oscillation cavity and the second air outlet flow channel to the end of the throat is a second front end length, and the second front end length is 4-6 times the length of the split-pivot front.

[0020] The distance from the connection between the second pulse oscillation cavity and the second air outlet flow channel to the end of the second pulse oscillation cavity is a second rear end length, and the second rear end length is 0.7-1.5 times the second front end length.

[0021] Further, the angle between the first air outlet flow channel and the first pulse oscillation cavity is a first angle, and the first angle is 80-90 degrees; and the width of the first air outlet flow channel is 2-4 times the width of the end of the throat.

[0022] The angle between the second air outlet flow channel and the second pulse oscillation cavity is a second angle, and the second angle is 80-90 degrees; and the width of the second air outlet flow channel is 2-4 times the width of the end of the throat.

[0023] Furthermore, the outwardly extending ends of the first outlet flow channel and the second outlet flow channel are detachably connected to a conversion pipe, and the conversion pipe is detachably connected to the microporous aeration coil.

[0024] Furthermore, the application method of the pulse periodic oscillation microporous bubble synergistic aeration system has the following specific steps:

[0025] Step 1: The gas from the gas supply source flows through the pipeline, passes through the valve, the pressure-stabilizing filter and the flow meter, and then enters the pulse oscillation device;

[0026] Step 2: The gas passing through the pressure-stabilizing filter enters the gradually contracting throat through the air inlet, and the throat nozzle accelerates to form a high-speed main jet;

[0027] Step 3: After entering the herringbone pulse oscillation unit, the gas preferentially adheres to the single-side wall of the first or second pulse oscillation cavity due to the initial perturbation wall curvature or flow bias. At this time, a narrow flow channel is formed between the jet and the attached wall. Based on the Bernoulli principle, a low-pressure adsorption force is generated to strengthen the wall adhesion. At the same time, the shear layer outside the jet continuously draws in the surrounding fluid due to the suction effect, exacerbating the low-pressure area and enhancing the adsorption strength.

[0028] Step 4: Most of the wall jet's airflow flows out of the first or second outlet channel. In this state, a small amount of diversion flows into the feedback loop on the same side and arrives at the root of the jet after a delay, forming a velocity drop zone at the impact point. Based on the Bernoulli principle, a local high pressure is generated, which destroys the force balance of the jet.

[0029] Step 5: At the same time, the non-wall-attached wall surface is not covered by the jet, and the entrainment effect recreates the low-pressure adsorption zone. Driven by the pressure difference, the jet detaches from the wall-attached side and switches to the opposite side for attachment, completing half a cycle of switching. Similarly, the "entrainment-drive-switch" process occurs on the new wall-attached side.

[0030] Step 6: Output a phase-reversed pulsating airflow, allowing the airflow to complete a full cycle of switching between the first pulse oscillation cavity and the second pulse oscillation cavity; the periodic switching causes the incoming main jet to rapidly alternately flow out along the first air outlet and the second air outlet, forming a pulsed oscillating flow;

[0031] In step seven, the periodic pulsed oscillating airflow is formed and flows to the microporous aeration coil through the conversion pipe, and then microporous bubbles are generated in the aeration tank; the periodic pulsating airflow directly acts on the microporous aeration process, introducing non-steady-state shear disturbances during the bubble generation stage, causing the orifice bubbles to detach and reduce their diameter, thereby stably generating micron-sized bubbles, thereby achieving the effect of enhancing the aeration system.

[0032] The beneficial effects of the present invention are embodied in:

[0033] In this invention, gas is accelerated in the air inlet unit to form a main jet. Within the pulse oscillation unit, jet diffusion and entrainment create a pressure gradient, triggering the Coanda wall attachment effect. When the jet deflects and attaches to one wall, part of the fluid acts in reverse on the jet root via a feedback loop, disrupting its force balance and forcing the main jet to break away from the current wall and switch to the opposite side, thus forming a continuous oscillation. This periodic pulsating airflow directly acts on the microporous aerator, introducing unsteady-state shear disturbances during the bubble generation phase, reducing the orifice bubble diameter by more than 40%, and stably generating micron-sized bubbles with a diameter of ≤50μm.

[0034] The present invention introduces periodic disturbances during the bubble generation stage by injecting a controlled pulsating oscillating airflow into the microporous aeration system, and then regulates the orifice bubble generation process through non-steady-state airflow, thereby improving the dispersion of gas in liquid to produce smaller and more uniform bubbles. By utilizing non-steady-state airflow, the traditional mechanism of bubble generation is changed, the refinement of bubbles is improved, thereby improving the gas-liquid contact efficiency and optimizing the performance of the aeration system; the non-steady-state characteristics of this airflow make the bubble generation process controllable and the aeration effect can be precisely adjusted. The present invention conveniently and efficiently creates a dynamic, periodic airflow switching process using only the pulse oscillation device, thereby greatly improving the uniformity and stability of micro-bubble generation; greatly saving costs and equipment energy consumption.

[0035] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention; the main purpose and other advantages of the present invention can be realized and obtained through the solutions particularly pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a three-dimensional schematic diagram of a pulse periodic oscillation microporous bubble enhancement aeration system and a pulse oscillation device;

[0037] Figure 2 is a schematic cross-sectional view of a pulse oscillation device;

[0038] Figure 3 is a schematic cross-sectional view of the air intake unit;

[0039] Figure 4 is a schematic cross-sectional view of a pulse oscillation unit;

[0040] Figure 5 It is a schematic diagram of the pulse periodic oscillation simulation of the pulse oscillation unit;

[0041] Figure 6 This is a schematic diagram of the pressure sensor signal at the outlet of the pulse oscillation device;

[0042] Figure 7This is a comparison of the oxygenation rate of the first type of microporous aeration coil when using / not using this system;

[0043] Figure 8 This is a comparison of the oxygenation rate of the second type of microporous aeration coil when using and not using this system.

[0044] Reference numerals: 1-air supply source, 2-valve, 3-pipeline, 4-pressure stabilizing filter, 5-flow meter, 6-pulse oscillation device, 61-air inlet unit, 611-air inlet, 612-throat, 62-pulse oscillation unit, 621-diverter section, 622-first pulse oscillation chamber, 623-first outlet channel, 624-first outlet, 625-second pulse oscillation chamber, 626-second outlet channel, 627-second outlet, 63-conversion pipe, 7-microporous aeration coil, 8-aeration tank;

[0045] W1-throat end width, W2-first outlet flow channel width, W3-second outlet flow channel width, R1-inlet radius, R2-arc segment radius, H1-splitter front length, P-concave arc surface length, L1-first front end length, L2-second front end length, L3-first rear end length, L4-second rear end length, O1-first angle, O2-second angle, O3-third angle, O4-fourth angle, O5-fifth angle, O6-sixth angle. DETAILED DESCRIPTION

[0046] like Figures 1 to 8 As shown, the pulsed periodic oscillation microporous bubble enhanced aeration system comprises an air source 1, connected in sequence via a pipe 3 to a valve 2, a pressure-stabilizing filter 4, a flowmeter 5, and a pulse oscillator 6 downstream of the air source 1, a microporous aeration coil 7 connected to the outlet of the pulse oscillator 6, and an aeration tank 8. The microporous aeration coil 7 is located at the bottom of the aeration tank 8. The air source 1 is a compressed air device or other gas source responsible for providing the required airflow to the system. Typical air sources 1 include air compressors, oxygen generators, and fans. Valve 2 regulates the gas flow rate, precisely controlling the gas input and ensuring that the airflow meets the preset flow and pressure requirements. Components such as the pressure-stabilizing filter 4 and flowmeter 5 ensure stable operation of the air supply system. The operating flow rate is adjusted based on actual needs, ensuring that the operating pressure and flow rate remain between 1 / 3 and 2 / 3 of the range of the pressure gauge and flowmeter 5. The final aeration pressure is typically controlled between 0.1 bar and 1 bar to ensure efficient and stable system operation.

[0047] In this embodiment, the pulse oscillator 6 is constructed from materials such as stainless steel, copper, or acrylic to ensure it meets the corresponding pressure safety level and usage requirements. The microporous aeration coil 7 is manufactured according to process requirements and can be used with various microporous coils, such as silicone rubber, ceramic, corundum, and perforated tubes, to meet different process requirements.

[0048] In this embodiment, the pulse oscillation device 6 includes an air intake unit 61 connected to the downstream of the flow meter 5 and a pulse oscillation unit 62 located downstream of the air intake unit 61; the air intake unit 61 and the pulse oscillation unit 62 are designed and manufactured as one piece. The air intake unit 61 includes an air inlet 611 and a throat 612 arranged downstream of the air inlet 611. The air inlet 611 is arranged in a circular shape, which is correspondingly connected to the upstream pipe 3; the air inlet radius R1 is greater than the width of the throat 612. The throat 612 is a tapered linear channel, and the connection with the air inlet 611 is arranged as an arc segment; the air inlet radius R1 is 4-8 times the width W1 of the throat end; the arc segment radius R2 is 2-3 times the width W1 of the throat end.

[0049] In this embodiment, the pulse oscillation unit 62 includes a diverter section 621 located downstream of the throat 612, a first pulse oscillation chamber 622 located on one side of the diverter section 621, a first outlet channel 623 and a first air outlet 624 located in the lower middle portion of the first pulse oscillation chamber 622, a second pulse oscillation chamber 625 located on the other side of the diverter section 621, and a second outlet channel 626 and a second air outlet 627 located in the lower middle portion of the second pulse oscillation chamber 625. The diverter section 621, the first pulse oscillation chamber 622, and the second pulse oscillation chamber 625 together form a herringbone-shaped oscillation chamber. The extended ends of the first and second outlet channels 623 and 626 are detachably connected to a conversion pipe 63, which is detachably connected to the microporous aeration coil 7. In this embodiment, the diverter split section 621 is angular and the top corner is set to a concave arc surface. The length P of the concave arc surface is 1-3 times the width W1 of the throat end, and the radius of the concave arc surface is 0.2-2 times the width W1 of the throat end; the length from the tip of the diverter split section 621 to the throat nozzle is the length before diverter splitting H1, and the length before diverter splitting H1 is 4-10 times the width W1 of the throat end.

[0050] In this embodiment, the first pulse oscillation cavity 622 and the second pulse oscillation cavity 625 are both linear expansion cavities; the angle between the outer side of the first pulse oscillation cavity 622 and the horizontal line is the third angle O3, the angle between the inner side of the first pulse oscillation cavity 622 and the horizontal line is the fourth angle O4, the angle between the inner side of the second pulse oscillation cavity 625 and the horizontal line is the fifth angle O5, and the angle between the outer side of the second pulse oscillation cavity 625 and the horizontal line is the sixth angle O6; the third angle O3 and the sixth angle O6 are both 18-22 degrees, and the fourth angle O4 and the fifth angle O5 are both 13-17 degrees.

[0051] In this embodiment, the distance from the connection between the first pulse oscillation cavity 622 and the first outlet flow channel 623 to the end of the throat 612 is the first front end length L1, and the first front end length L1 is 4-6 times the length H1 before the splitter; the distance from the connection between the first pulse oscillation cavity 622 and the first outlet flow channel 623 to the end of the first pulse oscillation cavity 622 is the first rear end length L3, and the first rear end length L3 is 0.7-1.5 times the first front end length L1;

[0052] The distance from the connection between the second pulse oscillation cavity 625 and the second outlet air channel 626 to the end of the throat 612 is the second front end length L2, and the second front end length L2 is 4-6 times the length H1 before the splitter; the distance from the connection between the second pulse oscillation cavity 625 and the second outlet air channel 626 to the end of the second pulse oscillation cavity 625 is the second rear end length L4, and the second rear end length L4 is 0.7-1.5 times the second front end length L2.

[0053] In this embodiment, the angle between the first outlet air channel 623 and the first pulse oscillation cavity 622 is the first angle O1, and the first angle O1 is 80-90 degrees; the width W2 of the first outlet air channel is 2-4 times the width W1 of the throat end; the angle between the second outlet air channel 626 and the second pulse oscillation cavity 625 is the second angle O2, and the second angle O2 is 80-90 degrees; the width W3 of the second outlet air channel is 2-4 times the width W1 of the throat end.

[0054] Combined with Figures 1 to 8 The following further illustrates the application method of the pulse periodic oscillation microporous bubble enhancement aeration system. The specific steps are as follows:

[0055] Step 1: The gas from the gas supply source 1 flows through the pipeline 3, the valve 2, the pressure stabilizing filter 4 and the flow meter 5, and then enters the pulse oscillation device 6.

[0056] Step 2: The gas passing through the pressure-stabilizing filter 4 enters the gradually contracting throat 612 through the air inlet 611, and the throat nozzle is accelerated to form a high-speed main jet.

[0057] Step 3: After entering the herringbone pulse oscillation unit 62, the gas preferentially adheres to a single wall of the first pulse oscillation cavity 622 or the second pulse oscillation cavity 625 due to the initial disturbance wall curvature or flow bias. At this time, a narrow flow channel is formed between the jet and the attached wall. Based on the Bernoulli principle, a low-pressure adsorption force is generated to strengthen the wall adhesion. At the same time, the shear layer outside the jet continuously draws in the surrounding fluid due to the suction effect, exacerbating the low-pressure area and enhancing the adsorption strength.

[0058] Step 4: Most of the airflow of the wall-attached jet flows out from the first outlet flow channel 623 or the second outlet flow channel 626. In this state, a small amount of diversion enters the feedback loop on the same side and arrives at the root of the jet after a delay, forming a flow velocity drop zone at the impact point. Based on the Bernoulli principle, a local high pressure is stimulated to form, destroying the force balance of the jet.

[0059] Step 5. At the same time, the non-wall-attached side wall is not covered by the jet, and the entrainment effect rebuilds the low-pressure adsorption zone. Driven by the pressure difference, the jet detaches from the wall-attached side and switches to the opposite side for attachment, completing half a cycle of switching. Similarly, "entrainment-drive-switch" occurs on the new wall-attached side.

[0060] Step 6: Output the pulsating airflow with phase reversal, so that the airflow completes the entire cycle switching between the first pulse oscillation cavity 622 and the second pulse oscillation cavity 625; the periodic switching makes the incoming main jet flow out along the first air outlet 624 and the second air outlet 627 quickly and alternately, forming Figure 5 The periodic pulse oscillatory flow is shown.

[0061] In this embodiment, the gas, influenced by jet diffusion and entrainment, gradually flows along the expanding wall, creating a Coanda effect. This effect allows the jet to remain stably attached to the wall during deflection, forming an effective flow switching mechanism. The main jet flow deflects toward one side of the wall, and during this deflection, the flow direction is switched via a feedback loop, thus achieving periodic jet switching. The jet at the nozzle experiences a main flow deviation due to the fluid feedback, further establishing a stable flow switching process.

[0062] In step seven, the periodic pulsed oscillating airflow formed flows through the conversion pipe 63 to the microporous aeration coil 7, and then generates microporous bubbles in the aeration tank 8; this periodic pulsating airflow directly acts on the microporous aeration process, introducing unsteady-state shear disturbances during the bubble generation stage, causing the orifice bubbles to detach and reduce their diameter, thereby stably generating micron-sized bubbles, thereby achieving the effect of enhancing the aeration system.

[0063] In this embodiment, pressure data collection and monitoring is performed on the outlet of the pulse oscillation device 6. The pressure sensor used is a current type sensor of a certain brand, which is connected to a matching data collector. The data collection frequency of the collector can reach up to 1000Hz. Figure 6 Schematic diagram of the pressure sensor signal at the outlet of the pulse oscillation device 6. It can be clearly seen that the outlet pressure presents a pulsating state with opposite phases, and the pulsating frequency is about 36 Hz.

[0064] In order to verify whether the pulsating airflow of the pulse oscillation device 6 can improve the aeration effect, a microporous aeration experiment was carried out. Figure 1An experimental platform was built for the enhanced aeration system on display. The gas used was sourced from a certain brand of air compressor. The working pressure of the aeration system was set to 0.1MPa, and the flow rate was controlled at 20L / min. In terms of aeration equipment, Class 2 DN215 microporous aeration coils 7 were selected, and the aeration tank 8 was a round barrel with a diameter of 0.6m, a water depth of 1m, and a barrel height of 1.2m. Sodium sulfite and cobalt chloride were used to remove the initial dissolved oxygen in the test water to below 2.0mg / L. The experiment compared the oxygenation effect when using this system and when not using it, and evaluated the gain effect of this system by comparing the rate of change of dissolved oxygen concentration. The experimental results are as follows. Figure 7 and Figure 8 shown.

[0065] For the first type of microporous aeration coil Figure 7 It can be seen that when the system was not used, the dissolved oxygen increased from 2.00 mg / L to 6.00 mg / L in a total of 5.42 minutes. After using the system, the total time was 4.25 minutes, the oxygenation time was shortened by 21.58%, and KLa increased by 31.31%. Figure 8 It can be seen that before using this system, it took 5.58 minutes for dissolved oxygen to increase from 2.00 mg / L to 6.00 mg / L. After using this system, the oxygenation time was reduced to 4.5 minutes, a 19.35% reduction in time, and the KLa efficiency increased by 22.60%. These results show that using this system significantly improves oxygenation efficiency, contributing to energy conservation, emission reduction, and reduced energy consumption.

[0066] In summary, this patented technology equipment can efficiently generate small and uniform bubbles through non-steady-state airflow control, significantly improve the gas-liquid mass transfer efficiency, and reduce aeration energy consumption. It is widely used in water treatment, aquaculture, chemical industry and other fields, and can save energy and reduce emissions and improve water treatment efficiency and water quality.

[0067] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. Pulse periodic oscillation microporous bubble synergistic aeration system, characterized by: The invention comprises an air supply source (1), a valve (2), a pressure stabilizing filter (4), a flow meter (5) and a pulse oscillating device (6) connected in sequence to the downstream of the air supply source (1) through a pipeline (3), a microporous aeration coil (7) and an aeration tank (8) connected to the outlet of the pulse oscillating device (6); the microporous aeration coil (7) is arranged at the bottom of the aeration tank (8); The pulse oscillation device (6) comprises an air intake unit (61) connected to the downstream of the flow meter (5) and a pulse oscillation unit (62) located downstream of the air intake unit (61); The air intake unit (61) comprises an air intake (611) and a throat (612) arranged downstream of the air intake (611); The pulse oscillation unit (62) comprises a flow splitting section (621) located downstream of the throat (612), a first pulse oscillation chamber (622) located on one side of the flow splitting section (621), a first outlet flow channel (623) and a first air outlet (624) provided at a middle and lower portion of the first pulse oscillation chamber (622), a second pulse oscillation chamber (625) located on the other side of the flow splitting section (621), and a second outlet flow channel (626) and a second air outlet (627) provided at a middle and lower portion of the second pulse oscillation chamber (625); The split flow section (621), the first pulse oscillation cavity (622), and the second pulse oscillation cavity (625) together form a herringbone oscillation cavity.

2. The pulse periodic oscillation microporous bubble synergistic aeration system according to claim 1, characterized in that: The air inlet (611) is configured to be circular and is correspondingly connected to the upstream pipeline (3); the radius (R1) of the air inlet is greater than the width of the throat (612).

3. The pulse periodic oscillation microporous bubble synergistic aeration system according to claim 2, characterized in that: The throat (612) is a tapered linear channel, and the connection with the air inlet (611) is set as an arc segment; the radius (R1) of the air inlet is 4-8 times the width (W1) of the throat end; the radius (R2) of the arc segment is 2-3 times the width (W1) of the throat end.

4. The pulse periodic oscillation microporous bubble synergistic aeration system according to claim 3, characterized in that: The split flow section (621) is angular and has a concave arc surface at its top corner, the length (P) of the concave arc surface is 1-3 times the width (W1) of the throat end, and the radius of the concave arc surface is 0.2-2 times the width (W1) of the throat end; The length from the split tip of the split section (621) to the throat nozzle is the split length (H1) before the split, and the split length (H1) before the split is 4-10 times the width (W1) of the throat end.

5. The pulse periodic oscillation microporous bubble synergistic aeration system according to claim 4, characterized in that: The first pulse oscillation cavity (622) and the second pulse oscillation cavity (625) are both linear expansion cavities; The angle between the outer side of the first pulse oscillation cavity (622) and the horizontal line is a third angle (O3), the angle between the inner side of the first pulse oscillation cavity (622) and the horizontal line is a fourth angle (O4), the angle between the inner side of the second pulse oscillation cavity (625) and the horizontal line is a fifth angle (O5), and the angle between the outer side of the second pulse oscillation cavity (625) and the horizontal line is a sixth angle (O6); The third angle (O3) and the sixth angle (O6) are both 18-22 degrees, and the fourth angle (O4) and the fifth angle (O5) are both 13-17 degrees.

6. The pulse periodic oscillation microporous bubble synergistic aeration system according to claim 5, characterized in that: The distance from the connection between the first pulse oscillation cavity (622) and the first outlet flow channel (623) to the end of the throat channel (612) is the first front end length (L1). The first front end length (L1) is 4-6 times the length before splitting (H1); The distance from the connection point between the first pulse oscillation cavity (622) and the first outlet flow channel (623) to the end of the first pulse oscillation cavity (622) is the first rear end length (L3), and the first rear end length (L3) is 0.7-1.5 times the first front end length (L1); The distance from the connection point between the second pulse oscillation cavity (625) and the second outlet flow channel (626) to the end of the throat channel (612) is the second front end length (L2), and the second front end length (L2) is 4-6 times the length before the splitting (H1); The distance from the connection point between the second pulse oscillation cavity (625) and the second outlet flow channel (626) to the end of the second pulse oscillation cavity (625) is the second rear end length (L4), and the second rear end length (L4) is 0.7-1.5 times the second front end length (L2).

7. The pulse periodic oscillation microporous bubble synergistic aeration system according to claim 6, characterized in that: The angle between the first outlet flow channel (623) and the first pulse oscillation cavity (622) is a first angle (O1), and the first angle (O1) is 80-90 degrees; the width (W2) of the first outlet flow channel is 2-4 times the width (W1) of the throat end; The angle between the second outlet flow channel (626) and the second pulse oscillation cavity (625) is a second angle (O2), and the second angle (O2) is 80-90 degrees; the width (W3) of the second outlet flow channel is 2-4 times the width (W1) of the throat end.

8. The pulse periodic oscillation microporous bubble synergistic aeration system according to claim 7, characterized in that: The extended ends of the first outlet flow channel (623) and the second outlet flow channel (626) are detachably connected to a conversion pipe (63), and the conversion pipe (63) is detachably connected to the microporous aeration coil (7).

9. An application method of the pulse periodic oscillation microporous bubble synergistic aeration system according to claim 8, characterized in that: The specific steps are as follows: Step 1: The gas from the gas supply source (1) flows through the pipeline (3), the valve (2), the pressure-stabilizing filter (4), and the flow meter (5), and then enters the pulse oscillation device (6); Step 2: The gas passing through the pressure-stabilizing filter (4) enters the gradually contracting throat (612) through the air inlet (611), and the throat nozzle is accelerated to form a high-speed main jet; Step 3: After entering the herringbone pulse oscillation unit (62), due to the initial disturbance wall curvature or flow bias, the gas preferentially adheres to the single-side wall of the first pulse oscillation cavity (622) or the second pulse oscillation cavity (625); at this time, a narrow flow channel is formed between the jet and the attached wall, and based on the Bernoulli principle, a low-pressure adsorption force is generated to strengthen the wall attachment. At the same time, the shear layer outside the jet continuously draws in the surrounding fluid due to the suction effect, thereby aggravating the low-pressure area and enhancing the adsorption strength. Step 4: Most of the airflow of the wall jet flows out from the first outlet airflow channel (623) or the second outlet airflow channel (626). In this state, a small amount of diversion flows into the feedback loop on the same side and arrives at the root of the jet after a delay, forming a velocity drop zone at the impact point. Based on the Bernoulli principle, a local high pressure is generated, which destroys the force balance of the jet. Step 5: At the same time, the non-wall-attached wall surface is not covered by the jet, and the entrainment effect recreates a low-pressure adsorption zone. Driven by the pressure difference, the jet detaches from the wall-attached side and switches to the opposite side, completing half a cycle of switching. Similarly, the "entrainment-drive-switch" cycle occurs on the new wall-attached side. Step 6: Outputting a phase-reversed pulsating airflow, allowing the airflow to complete the entire cycle switching between the first pulse oscillation cavity (622) and the second pulse oscillation cavity (625); the periodic switching causes the incoming main jet to flow out rapidly and alternately along the first air outlet (624) and the second air outlet (627), forming a pulse oscillation flow; In step seven, the periodic pulsed oscillating airflow is formed and flows to the microporous aeration coil (7) through the conversion pipe (63), and then microporous bubbles are generated in the aeration tank (8); the periodic pulsating airflow directly acts on the microporous aeration process, and introduces non-steady-state shear disturbance in the bubble generation stage, so that the orifice bubbles are separated and the diameter is reduced, thereby stably generating micron-sized bubbles, so as to achieve the effect of enhancing the aeration system.

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