Flow channel optimization method for gas-liquid separation structure

Abstract

The invention relates to the technical field of gas-liquid separation, in particular to a flow channel optimization method for a gas-liquid separation structure, and the method comprises the steps: building a flow field prediction model; calculating flow field predicted characteristic data at the outlet of the copper elbow; the initial flow guide deflection angle of the flow channel is adjusted according to the predicted fluid strength; introducing a fluid; detecting the actual fluid main vortex flow direction of the fluid in the flow channel; according to the flow direction deviation value, the width of a flow channel flow guide fan-shaped area in the deviation direction of the flow direction deviation value is determined, and the flow field control depth in the flow channel flow guide fan-shaped area is adjusted; detecting the actual fluid strength of the fluid in the flow channel, and obtaining the strength deviation value; adjusting the predicted fluid flow in a flow field prediction model; and recalculating the predicted characteristic data of the flow field, and re-determining the initial flow guide deflection angle until the flow direction deviation value and the strength deviation value meet the requirements. The stability of the gas-liquid separation structure is improved.

Description

Technical Field

[0001] This invention relates to the field of gas-liquid separation technology, and in particular to a flow channel optimization method for gas-liquid separation structures. Background Technology

[0002] In existing technologies, the optimization of flow channels in gas-liquid separation structures mainly revolves around optimizing flow channel structural parameters, active flow field control, novel flow channel configuration design, and multi-scale multi-physics field coupling analysis. Regarding the optimization of flow channel structural parameters, separation performance is improved through systematic research on key geometric parameters. For example, for cyclone separators, the focus is on optimizing parameters such as inlet size and shape, cylinder diameter and length, cone angle, and dust outlet diameter. Increasing the inlet aspect ratio can reduce flow field eccentricity and pressure drop, while appropriately reducing the cone angle can prolong gas-liquid residence time and improve separation efficiency. Active flow field control technology improves the flow state within the flow channel through external intervention during flow channel optimization. One approach is to install vortex generators, such as micro-turbulence columns or guide fins, at the inlet of the flow channel or at specific locations to artificially introduce small-scale vortices and enhance the centrifugal migration of liquid particles. Another approach is to use pulsating flow excitation, which promotes liquid film rupture and droplet coalescence by periodically changing the inlet velocity or applying vibration to the flow channel wall, which can effectively improve separation efficiency, especially under low Reynolds number flow. The multi-scale multiphysics coupling analysis method uses a coupled model of computational fluid dynamics (CFD) and discrete element method (DEM) to simultaneously consider the continuous phase gas flow and the discrete phase droplet motion, simulating the entire process of droplet breakage, coalescence, and migration, providing a microscopic theoretical basis for macroscopic flow channel optimization.

[0003] Chinese Patent Publication No. CN115682481A discloses a gas-liquid separator, a computer storage medium, an air conditioning system, and a control method thereof. The system includes: a tank with a separation chamber formed within it; spiral ribs on the inner wall of the tank limiting a spiral flow channel; and a refrigerant inlet pipe, a gas outlet pipe, and a liquid outlet pipe connected to the tank. All three pipes are connected to the separation chamber, with the liquid outlet pipe connected to the lower end of the tank. The refrigerant inlet pipe is used to input refrigerant into the spiral flow channel. It is evident that the gas-liquid separator, computer storage medium, air conditioning system, and control method suffer from a problem due to the presence of rolling-direction textures on the inner wall of the pipeline transporting the gas-liquid mixture. The outer roughness decreases due to stretching, becoming smoother, while the inner roughness increases due to compression, leading to an asymmetrical velocity distribution of the gas-liquid mixture as it flows through asymmetrical wall friction, thus causing asymmetrical secondary flow. Summary of the Invention

[0004] To address this, the present invention provides a flow channel optimization method for gas-liquid separation structures, which overcomes the problem in the prior art where the inner wall of the pipeline conveying the gas-liquid mixture has a rolling direction texture, the outer roughness decreases due to stretching and becomes smoother, while the inner roughness increases due to compression and becomes rougher, resulting in an asymmetrical velocity distribution of the gas-liquid mixture as it flows through asymmetrical wall friction, thus causing asymmetrical secondary flow.

[0005] To achieve the above objectives, the present invention provides a flow channel optimization method for a gas-liquid separation structure, comprising:

[0006] A flow field prediction model is established based on the bending angle of the copper bend in the flow channel, the anisotropy coefficient of the rolled material of the copper bend, the expected fluid flow rate, and the fluid flow rate.

[0007] The predicted flow field characteristics at the outlet of the copper bend are calculated based on the flow field prediction model. The predicted flow field characteristics include the predicted direction of the main fluid vortex and the predicted fluid intensity.

[0008] Adjust the initial guide deflection angle of the flow channel according to the expected fluid intensity;

[0009] Fluid is introduced into the flow channel according to the initial guiding deflection angle and passes sequentially through the copper bend and the gas-liquid separation body;

[0010] The actual main vortex flow direction of the fluid in the flow channel is detected, and the actual main vortex flow direction is compared with the expected main vortex flow direction to determine the flow direction deviation.

[0011] The width of the flow channel guiding fan-shaped region located in the deviation direction of the flow direction deviation is determined based on the flow direction deviation amount, and the flow field control depth within the flow channel guiding fan-shaped region is adjusted.

[0012] The actual fluid intensity in the flow channel is detected based on the adjusted flow field control depth, and the actual fluid intensity is compared with the expected fluid intensity to obtain the intensity deviation.

[0013] Adjust the predicted fluid flow rate in the flow field prediction model according to the intensity deviation;

[0014] The expected flow field characteristic data are recalculated based on the adjusted expected fluid flow rate, and the initial guide deflection angle is re-determined until the flow direction deviation and the intensity deviation meet the requirements.

[0015] Furthermore, the copper bend is formed from rolled copper strip.

[0016] Furthermore, the process of adjusting the initial guide deflection angle of the flow channel according to the expected fluid intensity includes:

[0017] Compare the expected fluid intensity with the preset fluid intensity;

[0018] If the expected fluid intensity is greater than or equal to the preset fluid intensity, then the initial guide deflection angle is reduced.

[0019] Furthermore, the process of determining the width of the flow channel guiding fan-shaped region located in the deviation direction of the flow direction deviation, and adjusting the flow field control depth within the flow channel guiding fan-shaped region, includes:

[0020] The vertical cross-section of the inlet flow channel of the gas-liquid separator is divided into several sector-shaped regions at equal angles.

[0021] The flow direction deviation is compared with a preset first deviation.

[0022] If the flow direction deviation is greater than or equal to the preset first deviation, then the width of the flow channel guiding fan-shaped region is determined to be the width of the fan-shaped region directly opposite the fan-shaped region corresponding to the deviation direction of the flow direction deviation, and the flow field control depth in the flow channel guiding fan-shaped region is reduced.

[0023] Furthermore, the flow direction deviation is the minimum angle between the actual main vortex flow direction of the fluid and the expected main vortex flow direction of the fluid on the vertical cross-section of the inlet channel of the gas-liquid separator.

[0024] Furthermore, the process of adjusting the predicted fluid flow rate in the flow field prediction model based on the intensity deviation includes:

[0025] The strength deviation is compared with a preset second deviation.

[0026] If the intensity deviation is greater than or equal to the preset second deviation, then the predicted fluid flow rate in the flow field prediction model is reduced.

[0027] Furthermore, the strength deviation is the ratio of the difference between the actual fluid strength and the expected fluid strength to the sum of the actual fluid strength and the expected fluid strength.

[0028] Furthermore, the process of redetermining the initial flow deflection angle until the flow direction deviation and the intensity deviation meet the requirements includes:

[0029] If, during N consecutive repetitions, the flow direction deviation is always less than the preset first deviation and the intensity deviation is always less than the preset second deviation, then the flow direction deviation and the intensity deviation are determined to meet the requirements.

[0030] Where N is an integer greater than or equal to 2.

[0031] Furthermore, the thickness of the copper bend is 0.8mm to 1.5mm, and the bending angle of the copper bend is 90° to 180°.

[0032] Furthermore, the process of establishing a flow field prediction model based on the processing bending angle of the copper bend in the flow channel, the anisotropy coefficient of the rolled material of the copper bend, and the fluid flow rate includes:

[0033] Calculate the centrifugal force of the flow channel bending based on the bending angle of the copper bend.

[0034] The boundary layer distribution on the flow channel wall is determined based on the anisotropy coefficient of the rolled material of the copper bend.

[0035] Based on the fluid flow rate, determine the Reynolds number and the fluid intensity;

[0036] The flow field prediction model is established by using fluid dynamics simulation to determine the centrifugal force of the flow channel bending, the boundary layer distribution of the flow channel wall, the Reynolds number, the Reynolds number of the fluid, and the fluid intensity.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows: The method of the present invention establishes a flow field prediction model based on the bending angle of the copper bend, the anisotropy coefficient of the rolled material, and the fluid flow rate. In the prior art, when a gas-liquid mixture flows through a rolled copper bend, the texture anisotropy of the material in the rolling direction leads to uneven roughness distribution on the inner wall of the pipe. The outer side is smooth due to stretching, while the inner side is rough due to compression, resulting in an asymmetric distribution of wall friction resistance, generating asymmetric secondary flow, disrupting the homogeneity of the gas-liquid two-phase flow, and affecting subsequent separation efficiency. By calculating the expected main vortex flow direction and expected fluid intensity at the outlet of the copper bend, the evolution trend of the asymmetric flow field is predicted in advance. By adjusting the initial guide deflection angle according to the expected fluid intensity, there is… This method effectively suppresses the strong vortex phenomenon caused by the aggravated centrifugal effect at high flow velocities, reduces the risk of deviation from the mainstream direction, and improves the rationality of the initial flow field guidance. By detecting the actual main vortex flow direction of the fluid in the channel and calculating the flow direction deviation, the width of the channel guiding fan-shaped region corresponding to the deviation direction is determined by the flow direction deviation, and the flow field control depth in this region is adjusted. This corrects the flow direction offset caused by the difference in wall roughness. By changing the flow field control depth in the fan-shaped region, the fluid is guided to form a stable vortex structure in a specific direction, weakening the interference of asymmetric secondary flow. After adjusting the flow field control depth, the predicted fluid flow rate in the flow field prediction model is adjusted by detecting the deviation between the actual fluid intensity and the predicted fluid intensity, avoiding the accumulation of intensity deviation caused by flow rate fluctuations.

[0038] Furthermore, the method of the present invention obtains the flow direction deviation by detecting the actual main vortex flow direction of the fluid and comparing it with the expected flow direction. Since traditional gas-liquid separation structures lack the means to correct the actual flow state, they are difficult to cope with the flow field distortion caused by processing deviations or material property fluctuations. By identifying the deviation direction of the flow direction deviation and determining the corresponding flow channel guiding fan-shaped region, and by adjusting the flow field control depth in this region, the directional optimization of the local flow channel structure is achieved. Without changing the overall structural layout, the intensity of the secondary flow in a specific direction is precisely weakened, the symmetry of the main flow is enhanced, and thus the flow uniformity before entering the gas-liquid separation body is improved.

[0039] Furthermore, the method described in this invention establishes a multi-round iterative optimization approach by repeatedly executing the entire process from initial flow deflection angle adjustment to deviation detection until the flow direction deviation and intensity deviation meet the preset threshold requirements N times consecutively. Since a single adjustment is unlikely to completely eliminate nonlinear disturbances in a complex flow field, especially under high Reynolds number or strong centrifugal conditions, residual vortices may continue to affect the separation effect. By setting multiple consecutive times to meet the target, premature stopping or over-adjustment is avoided, thereby improving the sufficiency and stability of the optimization process.

[0040] Furthermore, the method of the present invention divides multiple flow channel guide fan-shaped regions on a 360° vertical cross section and adjusts the flow field control depth in the region directly opposite the deviation direction. Since asymmetric secondary flow usually manifests as concentrated rotational energy within a certain range, simply enhancing the disturbance locally can easily lead to new imbalances. By applying a deeper flow field control structure in the opposite direction, reverse vorticity is actively induced, achieving vortex counterbalancing and further improving the symmetry of the flow field and the uniformity of gas-liquid distribution. Attached Figure Description

[0041] Figure 1 This is an overall flowchart of the flow channel optimization method for gas-liquid separation structures according to an embodiment of the present invention;

[0042] Figure 2 This is a flowchart illustrating the adjustment of the initial flow deflection angle of the flow channel in the flow channel optimization method for a gas-liquid separation structure according to an embodiment of the present invention.

[0043] Figure 3 This is a flowchart illustrating the flow field control depth within the flow field guiding fan-shaped region of the flow channel in the flow channel optimization method for a gas-liquid separation structure according to an embodiment of the present invention.

[0044] Figure 4 This is a flowchart illustrating the flow field prediction model established for the flow channel optimization method used in gas-liquid separation structures according to an embodiment of the present invention. Detailed Implementation

[0045] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0046] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0047] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0048] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Please see Figure 1 Overall flowchart of the flow channel optimization method for gas-liquid separation structure according to embodiments of the present invention. Figure 2 Flowchart for adjusting the initial guide deflection angle of the flow channel Figure 3 Flow diagram of flow field control depth within the flow channel guide fan region and Figure 4 As shown in the flowchart for establishing a flow field prediction model, an embodiment of the present invention provides a flow channel optimization method for a gas-liquid separation structure, comprising:

[0050] A flow field prediction model is established based on the bending angle of the copper bend in the flow channel, the anisotropy coefficient of the rolled material of the copper bend, the expected fluid flow rate, and the fluid flow rate.

[0051] The predicted flow field characteristics at the outlet of the copper bend are calculated based on the flow field prediction model. The predicted flow field characteristics include the predicted direction of the main fluid vortex and the predicted fluid intensity.

[0052] Adjust the initial guide deflection angle of the flow channel according to the expected fluid intensity;

[0053] Fluid is introduced into the flow channel according to the initial guiding deflection angle and passes sequentially through the copper bend and the gas-liquid separation body;

[0054] The actual main vortex flow direction of the fluid in the flow channel is detected, and the actual main vortex flow direction is compared with the expected main vortex flow direction to determine the flow direction deviation.

[0055] The width of the flow channel guiding fan-shaped region located in the deviation direction of the flow direction deviation is determined based on the flow direction deviation amount, and the flow field control depth within the flow channel guiding fan-shaped region is adjusted.

[0056] The actual fluid intensity in the flow channel is detected based on the adjusted flow field control depth, and the actual fluid intensity is compared with the expected fluid intensity to obtain the intensity deviation.

[0057] Adjust the predicted fluid flow rate in the flow field prediction model according to the intensity deviation;

[0058] The expected flow field characteristic data are recalculated based on the adjusted expected fluid flow rate, and the initial guide deflection angle is re-determined until the flow direction deviation and the intensity deviation meet the requirements.

[0059] Specifically, the anisotropy coefficient is the anisotropic yield criterion parameter of the rolled material of the copper bend. Examples of yield criteria include the Hill48 yield criterion and the Barlat89 yield criterion.

[0060] Specifically, fluid intensity is the magnitude of vorticity generated when a fluid flows.

[0061] In practice, the method of this invention establishes a flow field prediction model based on the bending angle of the copper bend, the anisotropy coefficient of the rolled material, and the fluid flow rate. In existing technologies, when a gas-liquid mixture flows through a rolled copper bend, the anisotropy of the material's texture in the rolling direction leads to uneven roughness distribution on the inner wall of the pipe. The outer side is smooth due to stretching, while the inner side is rough due to compression, resulting in an asymmetric distribution of wall friction resistance and generating asymmetric secondary flow. This disrupts the homogeneity of the gas-liquid two-phase flow and affects subsequent separation efficiency. By calculating the expected direction of the main fluid vortex and the expected fluid intensity at the outlet of the copper bend, the method achieves a preliminary prediction of the evolution trend of the asymmetric flow field. By adjusting the initial guide deflection angle based on the expected fluid intensity, high flow velocities are effectively suppressed. The strong vortex phenomenon caused by the aggravated centrifugal effect reduces the risk of deviation from the mainstream direction and improves the rationality of the initial flow field guidance. By detecting the actual main vortex flow direction in the flow channel and calculating the flow direction deviation, the width of the flow channel guiding fan-shaped region corresponding to the deviation direction is determined by the flow direction deviation, and the flow field control depth in this region is adjusted to correct the flow direction deviation caused by the difference in wall roughness. By changing the flow field control depth in the fan-shaped region, the fluid is guided to form a stable vortex structure in a specific direction, weakening the interference of asymmetric secondary flow. After adjusting the flow field control depth, the predicted fluid flow rate in the flow field prediction model is adjusted by detecting the deviation between the actual fluid intensity and the predicted fluid intensity, avoiding the accumulation of intensity deviation caused by flow rate fluctuations.

[0062] Specifically, the copper bend is formed by rolling copper strip.

[0063] Specifically, the inner wall of the inlet channel of the gas-liquid separator is provided with several rotatable and retractable guide vanes at equal intervals in a ring.

[0064] The rotation of the guide vane is achieved by a motor connected to the inlet channel driving a screw to rotate, which in turn rotates the guide vane connected to the screw.

[0065] The extension and retraction of the guide vane are adjusted by a small stepper motor connected to the inlet channel.

[0066] Specifically, the flow deflection angle is the angle between the orientation of the flow guide vane and the orientation of the inlet channel; the flow field control depth is the depth to which the flow guide vane extends or retracts into the inlet channel.

[0067] Specifically, the process of adjusting the initial guide deflection angle of the flow channel according to the expected fluid intensity includes:

[0068] Compare the expected fluid intensity with the preset fluid intensity;

[0069] If the expected fluid intensity is greater than or equal to the preset fluid intensity, then the initial guide deflection angle is reduced.

[0070] Specifically, taking the gas-liquid separator of the outdoor unit of a residential multi-split air conditioning system as an example, under the conditions of a copper bend thickness of 1mm, a bending angle of 90°, a diameter of 12.7mm, and R410A refrigerant, the general range of the preset fluid strength is [120000s]. -1 160000s -1 The preferred embodiment for the preset fluid intensity is 150,000 s. -1 .

[0071] Those skilled in the art will understand that the range of preset fluid strength and the preferred embodiment provided in this embodiment are the values ​​that best address the technical problem solved by the present invention, taken as an example of the gas-liquid separator of the outdoor unit of a household multi-split air conditioning system, under the conditions that the copper bend thickness is 1mm, the bending angle is 90°, the diameter is 12.7mm, and the fluid is R410A refrigerant. In actual applications or experiments, those skilled in the art can make adaptive adjustments to the preset fluid strength according to the actual application environment and application scenario.

[0072] In practice, the larger the angle of the guide vanes, the stronger the torsional effect on the fluid and the stronger the vortex generated. Therefore, when the predicted vortex is already too large, this torsional force can be reduced to allow the fluid to enter the bend more smoothly. If the difference between the predicted fluid strength and the preset fluid strength is within 10000s... -1 If the initial flow deflection angle is reduced to 98% of its original value, then the difference between the expected fluid strength and the preset fluid strength exceeds 10,000 s. -1 Every time it exceeds 10000 seconds -1 If the initial flow deflection angle continues to decrease by 0.2°, for example, if the difference between the expected fluid strength and the preset fluid strength is 20000s... -1 If the initial guide deflection angle is 15°, then the initial guide deflection angle will decrease to 15°×98%-0.2°=14.5°.

[0073] In practice, the method of this invention obtains the flow direction deviation by detecting the actual main vortex flow direction of the fluid and comparing it with the expected flow direction. Since traditional gas-liquid separation structures lack the means to correct the actual flow state, they are difficult to deal with the flow field distortion caused by processing deviations or material property fluctuations. By identifying the deviation direction of the flow direction deviation and determining the corresponding flow channel guiding fan-shaped area, and by adjusting the flow field control depth in this area, the directional optimization of the local flow channel structure is achieved. Without changing the overall structural layout, the intensity of the secondary flow in a specific direction is precisely weakened, and the symmetry of the main flow is enhanced, thereby improving the flow uniformity before entering the main gas-liquid separation body.

[0074] In practice, the method of the present invention divides multiple flow channel guide fan-shaped regions on a 360° vertical cross section and adjusts the flow field control depth in the region directly opposite the deviation direction. Since asymmetric secondary flow usually manifests as concentrated rotational energy within a certain range, simply enhancing the disturbance locally can easily lead to new imbalances. By applying a deeper flow field control structure in the opposite direction, reverse vorticity is actively induced, achieving vortex counterbalancing and further improving the symmetry of the flow field and the uniformity of gas-liquid distribution.

[0075] Specifically, the process of determining the width of the flow channel guiding fan-shaped region located in the deviation direction of the flow direction deviation, and adjusting the flow field control depth within the flow channel guiding fan-shaped region, includes:

[0076] The vertical cross-section of the inlet flow channel of the gas-liquid separator is divided into several sector-shaped regions at equal angles.

[0077] The flow direction deviation is compared with a preset first deviation.

[0078] If the flow direction deviation is greater than or equal to the preset first deviation, the width of the flow channel guiding fan region is determined to be the width of the fan region directly opposite the fan region corresponding to the deviation direction of the flow direction deviation, and the flow field control depth in the flow channel guiding fan region is reduced.

[0079] Specifically, the flow direction deviation is the minimum angle between the actual main vortex flow direction of the fluid and the expected main vortex flow direction of the fluid on the vertical cross-section of the inlet flow channel of the gas-liquid separator.

[0080] Specifically, the actual flow direction of the main fluid vortex is detected by a PIV particle image velocimeter or a high-speed camera installed in the inlet channel of the gas-liquid separator.

[0081] Specifically, the width of the flow channel guide fan-shaped region is the width of the inlet flow channel corresponding to the flow channel guide fan-shaped region. For example, if the diameter of the inlet flow channel is 12mm and it is divided into 12 fan-shaped regions at 30°, then the width of a single flow channel guide fan-shaped region is 12mm×π÷12≈3.14mm.

[0082] Specifically, taking the gas-liquid separator of the outdoor unit of a household multi-split air conditioning system as an example, under the conditions that the copper bend is 1mm thick, the bending angle is 90°, the diameter is 12.7mm and the fluid is R410A refrigerant, the general range of the preset first deviation is [4°, 6°], and the preferred embodiment of the preset first deviation is 5°.

[0083] Those skilled in the art will understand that the selectable range of the preset first deviation amount and the preferred embodiment provided in this embodiment are the values ​​that best address the technical problem solved by the technical solution of the present invention, taken as an example of the gas-liquid separator of the outdoor unit of a household multi-split air conditioning system, under the conditions that the copper bend thickness is 1mm, the bending angle is 90°, the diameter is 12.7mm, and the fluid is R410A refrigerant. In actual applications or experiments, those skilled in the art can make adaptive adjustments to the preset first deviation amount according to the actual application environment and application scenario.

[0084] In practice, if the vortex deviates eastward, it indicates that the guidance on the east side is too strong or the guidance on the west side is too weak. Therefore, the insertion depth of the guide vanes on the opposite west side should be reduced, which is equivalent to reducing the resistance on the west side, making it easier for the fluid to flow westward, thereby pulling the vortex center back to the middle. For example, if the flow direction deviation is divided into 12 fan-shaped regions at 30° intervals, and the difference between the flow direction deviation and the preset first deviation is 3°, and the vortex deviates in a flow channel guide fan-shaped region, then the width of the flow channel guide fan-shaped region is determined to be the width of the corresponding fan-shaped region directly opposite it, and the flow field control depth within the width of a fan-shaped region is reduced. If the difference between the flow direction deviation and the preset first deviation is 3° and the vortex deflection crosses two fan-shaped regions, then the width of the flow channel guiding fan-shaped region is determined to be the width of the two corresponding fan-shaped regions directly opposite each other, and the flow field control depth within the width of the two fan-shaped regions is reduced; if the difference between the flow direction deviation and the preset first deviation exceeds 1°, then the flow field control depth is reduced by 0.1mm. For example, if the difference between the flow direction deviation and the preset first deviation is 3° and the current flow field control depth is 5mm, then the flow field control depth is reduced to 5mm-0.1mm×3=4.7mm.

[0085] Specifically, the process of adjusting the predicted fluid flow rate in the flow field prediction model based on the intensity deviation includes:

[0086] The strength deviation is compared with a preset second deviation.

[0087] If the intensity deviation is greater than or equal to the preset second deviation, then the predicted fluid flow rate in the flow field prediction model is reduced.

[0088] Specifically, the strength deviation is the ratio of the difference between the actual fluid strength and the expected fluid strength to the sum of the actual fluid strength and the expected fluid strength.

[0089] Specifically, taking the gas-liquid separator of the outdoor unit of a household multi-split air conditioning system as an example, under the conditions that the copper bend is 1mm thick, the bending angle is 90°, the diameter is 12.7mm and the fluid is R410A refrigerant, the general range of the preset second deviation is [4%, 12%], and the preferred embodiment of the preset second deviation is 8%.

[0090] Those skilled in the art will understand that the selectable range of the preset second deviation amount and the preferred embodiment provided in this embodiment are the values ​​that best address the technical problem solved by the technical solution of the present invention, taken as an example of the gas-liquid separator of the outdoor unit of a household multi-split air conditioning system, under the conditions that the copper bend thickness is 1mm, the bending angle is 90°, the diameter is 12.7mm, and the fluid is R410A refrigerant. In actual applications or experiments, those skilled in the art can make adaptive adjustments to the preset second deviation amount according to the actual application environment and application scenario.

[0091] In practice, if the difference between the strength deviation and the preset second deviation exceeds 10%, the expected fluid flow rate will be reduced by 5%. For example, if the current expected fluid flow rate input is 0.125 kg / s and the difference between the strength deviation and the preset second deviation is 25.6%, then the expected fluid flow rate will be reduced to 0.125 kg / s × (1-0.05) × (1-0.05) × (1-0.05) ≈ 0.107 kg / s.

[0092] Specifically, the process of redetermining the initial flow deflection angle until the flow direction deviation and the intensity deviation meet the requirements includes:

[0093] If, during N consecutive repetitions, the flow direction deviation is always less than the preset first deviation and the intensity deviation is always less than the preset second deviation, then the flow direction deviation and the intensity deviation are determined to meet the requirements.

[0094] Where N is an integer greater than or equal to 2.

[0095] In practice, the method described in this invention repeatedly executes the entire process from initial flow deflection angle adjustment to deviation detection until the flow direction deviation and intensity deviation meet the preset threshold requirements N times consecutively. This establishes a multi-round iterative optimization approach. Since a single adjustment is unlikely to completely eliminate nonlinear disturbances in a complex flow field, especially under high Reynolds number or strong centrifugal conditions, residual vortices may continue to affect the separation effect. By setting multiple consecutive times to meet the target, premature stopping or over-adjustment is avoided, thereby improving the sufficiency and stability of the optimization process.

[0096] Specifically, the thickness of the copper bend is 0.8mm to 1.5mm, and the bending angle of the copper bend is 90° to 180°.

[0097] Specifically, the process of establishing a flow field prediction model based on the bending angle of the copper bend in the flow channel, the anisotropy coefficient of the rolled material of the copper bend, and the fluid flow rate includes:

[0098] Calculate the centrifugal force of the flow channel bending based on the bending angle of the copper bend.

[0099] The boundary layer distribution on the flow channel wall is determined based on the anisotropy coefficient of the rolled material of the copper bend.

[0100] Based on the fluid flow rate, determine the Reynolds number and the fluid intensity;

[0101] The flow field prediction model is established by using fluid dynamics simulation to determine the centrifugal force of the flow channel bending, the boundary layer distribution of the flow channel wall, the Reynolds number, the Reynolds number of the fluid, and the fluid intensity.

[0102] Specifically, the process of establishing a flow field prediction model includes:

[0103] A geometric model is established based on the actual three-dimensional dimensions of the copper bend, the gas-liquid separation unit, and the upstream pipeline.

[0104] The geometric model is discretized into a mesh, and the mesh is refined on the bend and inner wall surface.

[0105] Multiple turbulence and multiphase flow simulations were performed using the k-ε model and the Volume of Fluid model, and a flow field prediction model was established using CFD software.

[0106] Specifically, the process of establishing the flow field prediction model is a well-known existing technology and will not be described in detail here.

[0107] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A flow channel optimization method for a gas-liquid separation structure, characterized in that, include: A flow field prediction model is established based on the bending angle of the copper bend in the flow channel, the anisotropy coefficient of the rolled material of the copper bend, the expected fluid flow rate, and the fluid flow rate. The predicted flow field characteristics at the outlet of the copper bend are calculated based on the flow field prediction model. The predicted flow field characteristics include the predicted direction of the main fluid vortex and the predicted fluid intensity. Adjust the initial guide deflection angle of the flow channel according to the expected fluid intensity; Fluid is introduced into the flow channel according to the initial guiding deflection angle and passes sequentially through the copper bend and the gas-liquid separation body; The actual main vortex flow direction of the fluid in the flow channel is detected, and the actual main vortex flow direction is compared with the expected main vortex flow direction to determine the flow direction deviation. The width of the flow channel guiding fan-shaped region located in the deviation direction of the flow direction deviation is determined based on the flow direction deviation amount, and the flow field control depth within the flow channel guiding fan-shaped region is adjusted. The actual fluid intensity in the flow channel is detected based on the adjusted flow field control depth, and the actual fluid intensity is compared with the expected fluid intensity to obtain the intensity deviation. Adjust the predicted fluid flow rate in the flow field prediction model according to the intensity deviation; The expected flow field characteristic data are recalculated based on the adjusted expected fluid flow rate, and the initial guide deflection angle is re-determined until the flow direction deviation and the intensity deviation meet the requirements.

2. The flow channel optimization method for gas-liquid separation structures according to claim 1, characterized in that, The copper bend is formed from rolled copper strip.

3. The flow channel optimization method for gas-liquid separation structures according to claim 2, characterized in that, The process of adjusting the initial guide deflection angle of the flow channel according to the expected fluid intensity includes: Compare the expected fluid intensity with the preset fluid intensity; If the expected fluid intensity is greater than or equal to the preset fluid intensity, then the initial guide deflection angle is reduced.

4. The flow channel optimization method for gas-liquid separation structures according to claim 3, characterized in that, The process of determining the width of the flow channel guiding fan-shaped region located in the deviation direction of the flow direction deviation, and adjusting the flow field control depth within the flow channel guiding fan-shaped region, includes: The vertical cross-section of the inlet flow channel of the gas-liquid separator is divided into several sector-shaped regions at equal angles. The flow direction deviation is compared with a preset first deviation. If the flow direction deviation is greater than or equal to the preset first deviation, then the width of the flow channel guiding fan-shaped region is determined to be the width of the fan-shaped region directly opposite the fan-shaped region corresponding to the deviation direction of the flow direction deviation, and the flow field control depth in the flow channel guiding fan-shaped region is reduced.

5. The flow channel optimization method for gas-liquid separation structures according to claim 4, characterized in that, The flow direction deviation is the minimum angle between the actual main vortex flow direction and the expected main vortex flow direction on the vertical cross-section of the inlet flow channel of the gas-liquid separator.

6. The flow channel optimization method for gas-liquid separation structures according to claim 5, characterized in that, The process of adjusting the predicted fluid flow rate in the flow field prediction model based on the intensity deviation includes: The strength deviation is compared with a preset second deviation. If the intensity deviation is greater than or equal to the preset second deviation, then the predicted fluid flow rate in the flow field prediction model is reduced.

7. The flow channel optimization method for gas-liquid separation structures according to claim 6, characterized in that, The strength deviation is the ratio of the difference between the actual fluid strength and the expected fluid strength to the sum of the actual fluid strength and the expected fluid strength.

8. The flow channel optimization method for a gas-liquid separation structure according to claim 7, characterized in that, The process of redetermining the initial flow deflection angle until the flow direction deviation and the intensity deviation meet the requirements includes: If, during N consecutive repetitions, the flow direction deviation is always less than the preset first deviation and the intensity deviation is always less than the preset second deviation, then the flow direction deviation and the intensity deviation are determined to meet the requirements. Where N is an integer greater than or equal to 2.

9. The flow channel optimization method for a gas-liquid separation structure according to claim 8, characterized in that, The thickness of the copper bend is 0.8mm to 1.5mm, and the bending angle of the copper bend is 90° to 180°.

10. The flow channel optimization method for a gas-liquid separation structure according to claim 9, characterized in that, The process of establishing a flow field prediction model based on the bending angle of the copper bend in the flow channel, the anisotropy coefficient of the rolled material of the copper bend, and the fluid flow rate includes: Calculate the centrifugal force of the flow channel bending based on the bending angle of the copper bend. The boundary layer distribution on the flow channel wall is determined based on the anisotropy coefficient of the rolled material of the copper bend. Based on the fluid flow rate, determine the Reynolds number and the fluid intensity; The flow field prediction model is established by using fluid dynamics simulation to determine the centrifugal force of the flow channel bending, the boundary layer distribution of the flow channel wall, the Reynolds number, the Reynolds number of the fluid, and the fluid intensity.

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