Bilateral half-height blade diffuser, design method, and related apparatus
By combining flow field analysis and numerical simulation, the optimal blade height and spacing of the double-sided half-height blade diffuser were determined, solving the design problem of the double-sided half-height diffuser and achieving high-efficiency and low-cost performance improvement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENYANG BLOWER WORKS GROUP CORP
- Filing Date
- 2022-12-12
- Publication Date
- 2026-05-29
AI Technical Summary
In the existing technology, there is a lack of effective design methods for the height and spacing of the blades of the double-sided half-height diffuser, which has prevented its widespread application in related products, and also makes it difficult and costly to manufacture.
By determining multiple combinations of cover-side blade height and shaft-side blade height based on the distance between the cover-side septum and the shaft-side septum, and combining the flow field vortex size and flow channel size, the selectable blade spacing is determined. The design table is then corrected through numerical simulation or experimentation to obtain the blade height and spacing corresponding to the highest efficiency value.
It achieves improved design efficiency, reduced flow separation and airflow impact losses, and expanded stable operating range while reducing computational load and cost. Its performance is close to that of a three-dimensional blade diffuser, and its cost is close to that of a two-dimensional blade diffuser.
Smart Images
Figure CN115795735B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of centrifugal compressor technology, and in particular to a design method for a double-sided half-height blade diffuser, a computer-readable storage medium, a control device, and a double-sided half-height blade diffuser. Background Technology
[0002] In centrifugal compressors, the diffuser is a crucial stationary component. Its main function is to slow down airflow with high kinetic energy, effectively converting kinetic energy into pressure energy. The performance of the diffuser is closely related to the compressor's stage efficiency and pressure rise.
[0003] Common diffusers are divided into bladeless diffusers and bladed diffusers. Generally speaking, bladeless diffusers are simple to design and easy to manufacture, with lower cost, flatter performance curves, and a wider operating range; however, they also have larger flow losses, lower pressure recovery coefficients, and lower efficiency. Compared with bladeless diffusers, bladed diffusers have smaller flow losses and higher pressure recovery coefficients. Bladed diffusers of the same size can achieve a larger pressure ratio and higher design efficiency; however, under varying operating conditions, their airflow impact losses are larger, making them prone to separation and significantly reducing efficiency. Furthermore, they are more likely to cause compressor surge when the flow rate decreases, and their stable operating range is narrower.
[0004] The structure of a half-height blade diffuser (hereinafter referred to as a half-height diffuser) is between that of a bladeless diffuser and a bladed diffuser. It is equivalent to a bladed diffuser in which the blades are partially cut along the blade height direction, and its performance characteristics are also between the two. Common half-height blade diffusers are divided into shaft-side half-height diffusers and cap-side half-height diffusers according to their blade installation position.
[0005] In addition, there is a double-sided half-height blade diffuser. Studies have shown that the efficiency and stable operating range of the three-dimensional blade diffuser are superior to those of the two-dimensional blade diffuser. However, due to the high manufacturing difficulty and processing cost of three-dimensional blades, this technology is currently mainly in the technology reserve stage, and there are very few three-dimensional blade diffusers in use worldwide. For the double-sided half-height diffuser, the blade shape and position of the blades arranged on the axial-side septum and the cover-side septum can be designed according to the flow field at their respective locations, thus more effectively reducing flow separation and achieving higher efficiency. At the same time, the double-sided half-height diffuser has less airflow impact loss under varying operating conditions and has a wider stable operating range. Therefore, the performance of the double-sided half-height diffuser will combine the advantages of bladeless diffusers and blade diffusers, outperforming axial-side half-height diffusers and cover-side half-height diffusers, and even approaching that of the three-dimensional blade diffuser.
[0006] However, double-sided half-height diffusers have not yet been applied in related products. One of the main reasons is that there are no effective design methods available for the blade height and spacing (circumferentially along the shaft-side and cap-side blades) of double-sided diffusers. It is difficult to find the optimal blade height and spacing based on conventional fluid machinery design theory and experience. While optimization studies often employ mathematical statistics, for the blade height and spacing parameters of double-sided half-height diffusers, simply using experimental optimization design and statistical analysis methods would result in complex optimization tables and a massive amount of statistical calculations. Summary of the Invention
[0007] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
[0008] Therefore, a first aspect of the present invention provides a design method for a double-sided half-height blade diffuser.
[0009] A second aspect of the present invention provides a computer-readable storage medium.
[0010] A third aspect of the present invention provides a control device.
[0011] A fourth aspect of the present invention provides a double-sided half-height blade diffuser.
[0012] In view of this, a design method for a double-sided half-height blade diffuser is proposed according to a first aspect of the embodiments of this application, comprising:
[0013] Based on the distance between the cover-side partition and the shaft-side partition, multiple combinations of cover-side blade height and shaft-side blade height are determined;
[0014] Based on the flow field vortex size and flow channel size of multiple combinations of cover-side blade height and shaft-side blade height, multiple optional blade spacings are determined;
[0015] A design table is constructed based on the combination of the cover-side blade height and the axial-side blade height and the optional blade spacing;
[0016] Based on the numerical simulation or experimental results of a single-sided half-height blade diffuser, the design table is revised to obtain the efficiency table.
[0017] Based on the final efficiency table, numerical simulations or experiments are conducted on the efficiency indicators of the schemes in the efficiency table.
[0018] Based on numerical simulation or experimental results, statistical analysis is used to obtain the height of the cover blade, the height of the axial blade, and the spacing between the blades corresponding to the highest efficiency value.
[0019] In one feasible implementation, the sum of the height of the cover-side blade and the height of the shaft-side blade is less than the distance between the cover-side partition and the shaft-side partition;
[0020] The ratio of the height of the cover-side blade to the height of the axial-side blade differs in different groups;
[0021] The values for the multiple optional blade spacings are different.
[0022] In one feasible implementation, the step of determining multiple selectable blade spacings based on the flow field vortex size and flow channel size derived from a combination of multiple cover-side blade heights and shaft-side blade heights includes:
[0023] Numerical simulations of diffusers with different flow rates under different blade spacings were performed to obtain flow field distribution diagrams;
[0024] Based on the flow field distribution diagram, the ratio of the vortex size and the flow channel width is determined by comparing the circumferential spacing between the blades on both sides to the spacing between the blades on the same side.
[0025] Based on the ratio, a number of optional blade spacings are determined.
[0026] In one feasible implementation, the step of revising the design table and obtaining the efficiency table based on the numerical simulation or experimental results of a single-sided half-height blade diffuser includes:
[0027] The design table was revised using the pseudo-level method to obtain the proposed test scheme table;
[0028] The proposed test scheme table is modified to reduce the least common multiple between the number of shaft-side blade heights, the number of cover-side blade heights, and the number of optional blade spacings, thus obtaining the test scheme table.
[0029] In one feasible implementation, the design method for a double-sided half-height blade diffuser further includes:
[0030] Based on the test plan table, a simulation experiment was conducted to obtain the efficiency value corresponding to each plan in the test plan table.
[0031] In one feasible implementation, the step of obtaining the cover-side blade height, axial-side blade height, and blade spacing corresponding to the highest efficiency value through statistical analysis based on numerical simulation or experimental results includes:
[0032] Regression analysis was performed on the efficiency values of each scheme to obtain the blade height and spacing parameter scheme corresponding to the optimal efficiency value.
[0033] Based on the scheme that meets the expected efficiency requirements, the structural parameters of the double-sided half-height blade diffuser are determined;
[0034] A double-sided half-height blade diffuser was fabricated based on the aforementioned structural parameters.
[0035] According to a second aspect of the embodiments of this application, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program that implements the design method of a double-sided half-height blade diffuser as described in any of the above technical solutions.
[0036] A control device is provided according to a third aspect of the embodiments of this application, comprising:
[0037] Memory, which stores computer programs;
[0038] The processor executes the computer program;
[0039] When the processor executes the computer program, it implements the design method of the double-sided half-height blade diffuser as described in any of the above technical solutions.
[0040] A fourth aspect of the embodiments of this application provides a double-sided half-height blade diffuser, comprising:
[0041] Cover side partition;
[0042] A axial-side partition is provided at a distance from the cover-side partition, and a flow channel is formed between the axial-side partition and the cover-side partition;
[0043] Cover-side blades, connected to the cover-side partition;
[0044] Shaft-side blades, connected to the shaft-side partition;
[0045] The heights of the cover-side blades and the shaft-side blades are determined based on the design method of the double-sided half-height blade diffuser as described in any of the above technical solutions.
[0046] In one feasible implementation, there are multiple cover-side blades and multiple shaft-side blades, which are divided into multiple groups. Each group includes one cover-side blade and one shaft-side blade, and the multiple groups of cover-side blades and shaft-side blades are arranged at intervals.
[0047] Compared with the prior art, the present invention has at least the following beneficial effects: The design method of the double-sided half-height blade diffuser provided in the embodiments of this application first selects multiple combinations of cover-side blade height and shaft-side blade height based on the distance between the cover-side partition and the shaft-side partition. Then, it determines the spacing between blades based on the measurement of the flow field vortex size and its comparison with the flow channel size. Based on the initially selected spacing and different combinations of cover-side blade height and shaft-side blade height, it determines the initial design table. It further performs numerical simulation or experiment on the single-sided half-height blade diffuser. Then, it corrects the design table based on the simulation or experiment results and performs numerical simulation or experiment on the efficiency index in the design table. Finally, based on the simulation or experiment results, it obtains the cover-side blade height, shaft-side blade height and the spacing between blades corresponding to the highest efficiency value through statistical analysis. Based on this, the parameter and size design of the double-sided half-height blade diffuser can be completed, ensuring that the designed double-sided half-height blade diffuser can meet the expected efficiency value. The design method for the double-sided half-height blade diffuser provided in this application embodiment can reduce the amount of calculation, improve design efficiency while ensuring design accuracy, facilitate the promotion of double-sided half-height blade diffusers, effectively reduce flow separation, and have a smaller airflow impact loss under varying operating conditions, and have a wider stable operating range. Attached Figure Description
[0048] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0049] Figure 1 A schematic flowchart illustrating the design steps of a double-sided half-height blade diffuser according to an embodiment of this application;
[0050] Figure 2 A structural block diagram of a computer-readable storage medium according to an embodiment of this application;
[0051] Figure 3 A structural block diagram of a control device according to an embodiment of this application;
[0052] Figure 4 A schematic structural diagram of a double-sided half-height blade diffuser at one angle, according to the first embodiment provided in this application;
[0053] Figure 5 Another schematic structural diagram of the double-sided half-height blade diffuser of the first embodiment provided in this application;
[0054] Figure 6A schematic structural diagram of a double-sided half-height blade diffuser according to the second embodiment provided in this application;
[0055] Figure 7 A schematic structural diagram of a double-sided half-height blade diffuser according to the third embodiment provided in this application;
[0056] Figure 8 A schematic structural diagram of a double-sided half-height blade diffuser according to the fourth embodiment provided in this application;
[0057] Figure 9 A schematic structural diagram of a double-sided half-height blade diffuser according to the fifth embodiment provided in this application.
[0058] in, Figures 4 to 9 The correspondence between the reference numerals and component names in the attached drawings is as follows:
[0059] 1. Cover side partition, 2. Shaft side partition, 3. Cover side blade, 4. Shaft side blade, 5. Flow channel. Detailed Implementation
[0060] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.
[0061] like Figure 1 As shown, a design method for a double-sided half-height blade diffuser is proposed according to a first aspect of an embodiment of this application, comprising:
[0062] Step 101: Based on the distance between the cover-side partition and the shaft-side partition, determine multiple combinations of cover-side blade height and shaft-side blade height. It is understood that the cover-side blade height and shaft-side blade height are different in different combinations, and the sum of the cover-side blade height and shaft-side blade height needs to be less than the distance between the cover-side partition and the shaft-side partition to facilitate the passage of fluid.
[0063] Step 102: Based on the flow field vortex size and flow channel size of multiple combinations of cover-side blade height and shaft-side blade height, determine multiple optional blade spacings; it can be understood that by performing multi-condition simulations under different blade spacings, multiple optional blade spacings can be determined.
[0064] Step 103: Based on the combination of cover-side blade height and axial-side blade height and the optional blade spacing, construct a design table; it is understood that the design table records multiple test schemes, such as different blade spacing, cover-side blade height and axial-side blade height in each test scheme.
[0065] Step 104: Based on the numerical simulation or experimental results of the single-sided half-height blade diffuser, revise the design table and obtain the efficiency table; it is understood that numerical simulation or experimental results can be performed on the performance of diffusers with single-sided half-height blades, and the blade height can be screened based on the obtained performance results, thereby revising the design table.
[0066] Step 105: Based on the final efficiency table, perform numerical simulation or experiment on the efficiency indicators of the schemes in the efficiency table; it is understood that simulation or experiment can be performed on each test scheme in the design table to determine the diffuser performance results corresponding to different schemes.
[0067] Step 106: Based on numerical simulation or experimental results, obtain the cover-side blade height, shaft-side blade height, and blade spacing corresponding to the highest efficiency value through statistical analysis. It is understood that after clarifying the simulation or experimental results, the efficiency value corresponding to each scheme can be determined. Then, regression analysis is performed on the efficiency values of each scheme to obtain the cover-side blade height, shaft-side blade height, and blade spacing corresponding to the highest efficiency value, which are the optimal design parameters for the double-sided half-height blade diffuser. These design parameters may not be within the range of the previously selected schemes.
[0068] The design method for a double-sided half-height blade diffuser provided in this application first selects multiple combinations of cover-side blade height and shaft-side blade height based on the distance between the cover-side partition and the shaft-side partition. Then, it determines the spacing between blades based on the measurement of the flow field vortex size and its comparison with the flow channel size. Next, it determines an initial design table based on the initially selected spacing and different combinations of cover-side blade height and shaft-side blade height. It then conducts numerical simulation or experiments on a single-sided half-height blade diffuser. Based on the simulation or experimental results, it corrects the design table and conducts numerical simulation or experiments on the efficiency indicators in the design table. Finally, based on the simulation or experimental results, it obtains the cover-side blade height, shaft-side blade height, and spacing between blades corresponding to the highest efficiency value through statistical analysis. Based on this, the parameter and size design of the double-sided half-height blade diffuser can be completed, ensuring that the designed double-sided half-height blade diffuser can meet the expected efficiency value. The design method for the double-sided half-height blade diffuser provided in this application embodiment can reduce the amount of calculation, improve design efficiency while ensuring design accuracy, facilitate the promotion of double-sided half-height blade diffusers, effectively reduce flow separation, and have a smaller airflow impact loss under varying operating conditions, and have a wider stable operating range.
[0069] This application's embodiments combine mathematical statistics and flow field analysis to obtain the optimal design height h of the axial blades and cover blades. z h g The optimal circumferential spacing d between the two blades zThe performance of this double-sided half-height blade diffuser is close to that of a three-dimensional blade diffuser, but its production cost is equivalent to that of a two-dimensional blade diffuser, making it highly efficient and low-cost. Verification through numerical simulation and centrifugal compressor model-level tests shows that the double-sided half-height blade diffuser designed according to this invention combines the advantages of both bladeless diffusers and blade diffusers. Its stable operating range is the same as that of a bladeless diffuser, and its design point efficiency is even slightly higher than that of a full-height blade diffuser.
[0070] In one feasible implementation, the sum of the cover-side blade height and the shaft-side blade height is less than the distance between the cover-side partition and the shaft-side partition; the ratio of the cover-side blade height to the shaft-side blade height is different in different groups; and the values of the multiple optional blade spacings are different.
[0071] Understandably, the purpose of this step is to initially select the height parameters of the shaft-side and cover-side blades. Multiple shaft-side and cover-side blade heights can be selected using arithmetic progressions to ensure that the sum of the blade heights on both sides is less than the flow channel height b3. For example, x1 shaft-side blade heights can be selected, and x2 cover-side blade heights can be selected.
[0072] The sum of the height of the cover-side blade and the height of the shaft-side blade is less than the distance between the cover-side partition and the shaft-side partition to ensure that there is a flow channel for the liquid to pass through freely; the different ratios of the height of the cover-side blade and the height of the shaft-side blade in different groups and the different values of the spacing between multiple optional blades can provide multiple sets of test schemes.
[0073] In one feasible implementation, the step of determining multiple optional blade spacings based on the flow field vortex size and flow channel size of multiple combinations of cover-side blade height and shaft-side blade height includes: performing numerical simulations of diffusers with different flow rates under different blade spacings to obtain flow field distribution maps; based on the flow field distribution maps, comparing vortex size and flow channel width to determine the ratio of the circumferential spacing between the blades on both sides to the spacing between blades on the same side; and based on the ratio, determining multiple optional blade spacings.
[0074] In this technical solution, the purpose of this step is to initially select the circumferential spacing parameters of the shaft-side and cover-side blades. By numerically simulating the flow field within the diffuser channel under different flow rates, a flow field distribution map is obtained, and the vortex size is measured and compared with the channel width at the location of the vortex. This yields the ratio of the circumferential spacing between the blades on both sides to the spacing between blades on the same side, which serves as the basis for selecting the blade spacing on both sides. For example, a total of x3 circumferential spacings are selected between the blades on both sides.
[0075] In one feasible implementation, the steps of revising the design table and obtaining the efficiency table based on numerical simulation or experimental results of a single-sided half-height blade diffuser include: constructing a preliminary design table based on the combination of cover-side blade height and shaft-side blade height and the optional blade spacing; revising the preliminary design table using the pseudo-horizontal method to obtain a proposed test scheme table; and revising the schemes in the proposed test scheme table to reduce the least common multiple between the number of shaft-side blade heights, the number of cover-side blade heights, and the number of optional blade spacings to obtain a test scheme table.
[0076] In this technical solution, considering that the initially selected factor levels are often arbitrary, the resulting uniform design table is quite complex, and the computational load during regression analysis is also large. Therefore, it is necessary to correct the factor levels. Here, the forms of shaft-side half-height diffusers and cover-side half-height diffusers are selected respectively, and numerical simulations or model-level experiments are conducted separately on the shaft-side blade height and cover-side blade height (blade heights can be selected using arithmetic progressions). Performance and flow field analyses are performed on the simulation or experimental results, and blade heights with poor performance are removed to obtain a range of blade heights with better performance. Within this range, new shaft-side blade heights x1' and cover-side blade heights x2' are selected, such that the least common multiple of x1', x2', and x3 is as small as possible.
[0077] In one feasible implementation, the method further includes: conducting a simulation experiment based on the test scheme table to obtain the efficiency value corresponding to each scheme in the test scheme table.
[0078] This technical solution further provides specific steps for implementing the simulation test, which can simulate each scheme in the test scheme table and obtain the efficiency value corresponding to each scheme. It can be understood that the simulation test can include numerical simulation or direct experiment.
[0079] In one feasible implementation, the step of obtaining the cover-side blade height, shaft-side blade height, and blade spacing corresponding to the highest efficiency value through statistical analysis based on numerical simulation or experimental results includes: performing regression analysis on the efficiency value corresponding to each scheme to obtain the blade height and spacing parameter scheme corresponding to the best efficiency value; determining the structural parameters of the double-sided half-height blade diffuser based on the scheme that meets the expected efficiency value requirements; and fabricating the double-sided half-height blade diffuser based on the structural parameters.
[0080] This technical solution further provides specific steps for determining the height of the cover-side blades and the shaft-side blades based on experimental results. This allows for further analysis of the experimental results, facilitating the determination of the optimal factor levels corresponding to the efficiency values and the accurate determination of the structural parameters of the double-sided half-height blade diffuser. It is understood that the statistical analysis steps may include using regression analysis in statistics to analyze the experimental data.
[0081] Understandably, once the structural parameters of the double-sided half-height blade diffuser are determined, the double-sided half-height blade diffuser can be manufactured based on these parameters.
[0082] Example 1
[0083] A centrifugal compressor was selected as the research object. Through model-level testing, the design method for the double-sided half-height blade diffuser provided in this application was verified. The optimal double-sided half-height blade diffuser achieved an efficiency at the design point that was approximately 4% higher than that of a bladeless diffuser, equal to or even higher than that of a full-height blade diffuser. Its stable operating range was the same as that of a bladeless diffuser, but 7%-10% longer than that of a full-height blade diffuser. The diffuser blades are still binary blades, resulting in lower manufacturing difficulty and processing costs.
[0084] like Figure 2 As shown, according to a second aspect of the embodiments of this application, a computer-readable storage medium 201 is provided, which stores a computer program 202 to implement a design method for a double-sided half-height blade diffuser as described in any of the above technical solutions.
[0085] The computer-readable storage medium 201 provided in this application embodiment first determines multiple combinations of cover-side blade height and shaft-side blade height based on the distance between the cover-side partition and the shaft-side partition. Then, it determines the spacing between the blades based on different operating modes. Based on the determined spacing and different combinations of cover-side blade height and shaft-side blade height, it determines a design table. Further, it conducts simulation experiments based on the design, and then, combined with the expected efficiency value, determines the cover-side blade height, shaft-side blade height, and the spacing between the blades. Based on this, the parameter and size design of the double-sided half-height blade diffuser can be completed, ensuring that the designed double-sided half-height blade diffuser can meet the expected efficiency value. The computer-readable storage medium 201 provided in this application embodiment can reduce the computational load, improve design efficiency while ensuring design accuracy, facilitate the promotion of double-sided half-height blade diffusers, effectively reduce flow separation, and have a smaller airflow impact loss under varying operating conditions, exhibiting a wider stable operating range.
[0086] like Figure 3 As shown, a control device is proposed according to a third aspect of the embodiments of this application, comprising: a memory 301 storing a computer program; and a processor 302 executing the computer program; wherein, when executing the computer program, the processor 302 implements the design method of a double-sided half-height blade diffuser as described in any of the above technical solutions.
[0087] The control device provided in this application first determines multiple combinations of cover-side blade height and shaft-side blade height based on the distance between the cover-side partition and the shaft-side partition. Then, it determines the spacing between the blades based on different operating modes. Next, based on the determined spacing and different combinations of cover-side blade height and shaft-side blade height, it determines the design table. Further, it conducts simulation experiments based on the design, and then, combined with the expected efficiency value, determines the cover-side blade height, shaft-side blade height, and the spacing between the blades. Based on this, the parameter and dimension design of the double-sided half-height blade diffuser can be completed, ensuring that the designed double-sided half-height blade diffuser can meet the expected efficiency value. The control device provided in this application reduces the computational load, improves design efficiency while ensuring design accuracy, facilitates the promotion of double-sided half-height blade diffusers, effectively reduces flow separation, and has a smaller airflow impact loss under varying operating conditions, exhibiting a wider stable operating range.
[0088] like Figures 4 to 9 As shown, a double-sided half-height blade diffuser is proposed according to a fourth aspect of the embodiments of this application, comprising: a cover-side partition 1; an axial-side partition 2, spaced apart from the cover-side partition 1, wherein a flow channel is formed between the axial-side partition 2 and the cover-side partition 1; a cover-side blade 3 connected to the cover-side partition 1; and an axial-side blade 4 connected to the axial-side partition 2; wherein the heights of the cover-side blade 3 and the axial-side blade 4 are determined based on the design method of the double-sided half-height blade diffuser as described in any of the above technical solutions.
[0089] The height of the cover-side blade 3 and the shaft-side blade 4 of the dual-sided half-height blade diffuser provided in this application embodiment are determined based on the design method of the dual-sided half-height blade diffuser as described in any of the above technical solutions. Therefore, the dual-sided half-height blade diffuser has all the beneficial effects of the design method of the above technical solutions, which will not be elaborated here.
[0090] like Figure 4 and Figure 5 As shown, multiple cover-side blades 3 are evenly distributed circumferentially on the surface of the cover-side partition 1 facing the axial-side partition 2, and multiple axial-side blades 4 are evenly distributed circumferentially on the surface of the axial-side partition 2 facing the cover-side partition 1. Both the cover-side blades 3 and the axial-side blades 4 are binary blades. The cover-side blades 3 and the axial-side blades 4 can adopt the same or different blade shapes, both are half-height blades, and the sum of the blade height of the cover-side blades 3 and the blade height of the axial-side blades 4 is less than the flow channel height b3 (e.g., ...). Figure 7 (As shown). The cover-side blade 3 and the shaft-side blade 4 can be arranged facing each other according to the flow field distribution (e.g., Figure 7 and Figure 9 (as shown) or staggered arrangement (e.g.) Figure 6 and Figure 8As shown, there is a gap between the cover-side blade 3 and the shaft-side blade 4. A centrally open flow channel 5 is formed between two adjacent cover-side blades 3 and between two adjacent shaft-side blades 4, in which the fluid can freely transition.
[0091] like Figure 9 As shown, in one feasible embodiment, there are multiple cover-side blades 3 and shaft-side blades 4, which are divided into multiple groups. Each group includes one cover-side blade and one shaft-side blade 4, and the multiple groups of cover-side blades 3 and shaft-side blades 4 are arranged at intervals. This arrangement enables the double-sided half-height blade diffuser to more effectively reduce flow separation and has higher efficiency. In particular, the double-sided half-height diffuser has less airflow impact loss under varying operating conditions and has a wider stable operating range.
[0092] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0093] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0094] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0095] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A design method for a double-sided half-height blade diffuser, characterized in that, include: Based on the distance between the cover-side partition and the shaft-side partition, multiple combinations of cover-side blade height and shaft-side blade height are determined; Based on the flow field vortex size and flow channel size of multiple combinations of cover-side blade height and shaft-side blade height, multiple optional blade spacings are determined; A design table is constructed based on the combination of the cover-side blade height and the axial-side blade height and the optional blade spacing; Based on the numerical simulation or experimental results of a single-sided half-height blade diffuser, the design table is revised to obtain the efficiency table. Based on the final efficiency table, numerical simulations or experiments are conducted on the efficiency indicators of the schemes in the efficiency table. Based on numerical simulation or experimental results, statistical analysis is used to obtain the cover-side blade height, axial-side blade height, and spacing between blades corresponding to the highest efficiency value. The step of revising the design table and obtaining the efficiency table based on numerical simulation or experimental results of a single-sided half-height blade diffuser includes: The design table was revised using the pseudo-level method to obtain the proposed test scheme table; The proposed test scheme table is modified to reduce the least common multiple between the number of shaft-side blade heights, the number of cover-side blade heights, and the number of optional blade spacings, thus obtaining the test scheme table.
2. The design method of the double-sided half-height blade diffuser according to claim 1, characterized in that, The sum of the height of the cover-side blade and the height of the shaft-side blade is less than the distance between the cover-side partition and the shaft-side partition; The ratio of the height of the cover-side blade to the height of the axial-side blade differs in different groups; The values for the multiple optional blade spacings are different.
3. The design method of the double-sided half-height blade diffuser according to claim 1, characterized in that, The step of determining multiple selectable blade spacings based on the flow field vortex size and flow channel size, which are combinations of multiple cover-side blade heights and shaft-side blade heights, includes: Numerical simulations of diffusers with different flow rates under different blade spacings were performed to obtain flow field distribution diagrams; Based on the flow field distribution diagram, the ratio of the vortex size and the flow channel width is determined by comparing the circumferential spacing between the blades on both sides to the spacing between the blades on the same side. Based on the ratio, a number of optional blade spacings are determined.
4. The design method of the double-sided half-height blade diffuser according to claim 1, characterized in that, Also includes: Based on the test plan table, a simulation experiment was conducted to obtain the efficiency value corresponding to each plan in the test plan table.
5. The design method of the double-sided half-height blade diffuser according to claim 4, characterized in that, The step of obtaining the cover-side blade height, axial-side blade height, and blade spacing corresponding to the highest efficiency value through statistical analysis based on numerical simulation or experimental results includes: Regression analysis was performed on the efficiency values of each scheme to obtain the blade height and spacing parameter scheme corresponding to the optimal efficiency value. Based on the scheme that meets the expected efficiency requirements, the structural parameters of the double-sided half-height blade diffuser are determined; A double-sided half-height blade diffuser was fabricated based on the aforementioned structural parameters.
6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that implements the design method of a double-sided half-height blade diffuser as described in any one of claims 1 to 5.
7. A control device, characterized in that, include: Memory, which stores computer programs; The processor executes the computer program; When the processor executes the computer program, it implements the design method of the double-sided half-height blade diffuser as described in any one of claims 1 to 5.
8. A double-sided half-height blade diffuser, characterized in that, include: Cover side partition; A axial-side partition is provided at a distance from the cover-side partition, and a flow channel is formed between the axial-side partition and the cover-side partition; Cover-side blades, connected to the cover-side partition; Shaft-side blades, connected to the shaft-side partition; The heights of the cover-side blades and the shaft-side blades are determined based on the design method of the double-sided half-height blade diffuser as described in any one of claims 1 to 5.
9. The double-sided half-height blade diffuser according to claim 8, characterized in that, There are multiple cover-side blades and multiple shaft-side blades, which are divided into multiple groups. Each group includes one cover-side blade and one shaft-side blade, and the multiple groups of cover-side blades and shaft-side blades are arranged at intervals.