CN117172143A - Method for designing axial flow pump guide vane body by adopting streamline method of CFD flow field analysis - Google Patents
Method for designing axial flow pump guide vane body by adopting streamline method of CFD flow field analysis Download PDFInfo
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- CN117172143A CN117172143A CN202310785775.3A CN202310785775A CN117172143A CN 117172143 A CN117172143 A CN 117172143A CN 202310785775 A CN202310785775 A CN 202310785775A CN 117172143 A CN117172143 A CN 117172143A
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Abstract
The invention discloses a method for designing an axial flow pump guide vane body by adopting a streamline method of CFD flow field analysis, which comprises the steps of firstly taking a value within a range of the velocity v of water flowing out of a guide vane body flow channel, then selecting other parameters according to the use environment of the guide vane body to build a model, analyzing the model design by utilizing CFD flow field analysis, and adjusting the parameters within the range of the value until the model design requirement is met. The invention has the advantages that: the CFD fluid is utilized to analyze the influence of hydraulic loss in the complex working condition flow, so that the hydraulic model of the guide vane is fully and comprehensively considered when the hydraulic model of the guide vane is designed and optimized, and the overall efficiency is improved. The guide vane hydraulic model with the optimal design can effectively improve the efficiency of the whole machine through fluid analysis, greatly increase the cavitation resistance and prolong the service life of the whole machine.
Description
Technical Field
The invention relates to a method for designing an axial flow pump guide vane body by adopting a streamline method of CFD flow field analysis.
Background
The existing hydraulic design method of the vane body and the vane of the axial flow pump can use a lifting method, an integrating method and a streamline method. The model design is generally carried out by adopting a streamline method in the industry, the distance L between the inlet edge of the guide vane and the outlet edge of the front end blade is optimized based on the aspect of improving the efficiency of the whole machine and reducing the hydraulic loss in the flow channel, the number z of the guide vane is selected, the placement angle alpha of the guide vane is calculated and selected, the diffusion angle theta of the guide vane body is set, the height H of the guide vane is calculated and selected in a large amount by combining with the thickness change rule of the 791 airfoil, and the guide vane model calculated and selected and designed can basically meet the requirement on the efficiency in the aspect of hydraulic power of the axial flow pump. Because many use occasions on the customer site work condition is abominable, can lead to axial-flow pump water inlet condition very disorder, and then increase the hydraulic loss in the runner, very big influence complete machine efficiency designs the high-efficient energy-saving product class that fails to reach the customer requirement according to above-mentioned mode.
Disclosure of Invention
The invention aims to provide a method for designing an axial flow pump guide vane body by adopting a streamline method of CFD flow field analysis, which can effectively solve the problems that the existing user has complex use condition and cannot design a product meeting the requirement of the user.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a method for designing an axial flow pump guide vane body by adopting a streamline method of CFD flow field analysis comprises the following steps:
setting the velocity v of water flowing out of a guide vane body flow channel at 2.5-3.5 m/S, and calculating the value of the annular cross section S of the water outlet of the guide vane body according to Q=S.v, wherein Q is the designed flow, v is the velocity, and S is the cross section area; selecting a diffusion angle theta of the guide vane, wherein theta is less than or equal to 10 degrees, and determining the outer diameter D of a guide vane body flow channel 1 And an inner diameter D 2 ；
Step two, determining the outer diameter and the inner diameter of the guide vane body flow channel according to the step one, and combining the distance L= (0.05-0.1) D between the inlet edge of the guide vane and the outlet edge of the impeller 1 Determining the position of the inlet edge of the guide vane; horizontal distance h= (0.4-0.45) D of guide vane outlet edge from guide vane inlet edge 1 Determining the position of the outlet edge of the guide vane;
step three, expanding to check the cross-sectional area of the water flow passage of the guide vane body according to a formula F=2pi Rcb psi 3, wherein Rc is the gravity center radius of the water flow section, psi 3 is the displacement coefficient of the vane, and b is the length of a forming line, the water flow passage of the guide vane body is gradually increased from the inlet side to the outlet side, and the water flow passage of the guide vane body is linear and gradually changed, so that the first step of hydraulic design of the guide vane is completed;
drawing an intermediate streamline according to a formulaCalculating to determine the middle point of each water cross section forming line, and sequentially connecting the middle points of the forming lines to obtain a middle streamline;
step five, according to the formulaAngle alpha for inlet of guide vane 3 Calculate Vm 3 =q/2pi Rcb ψ3, where Q is the design flow, b is the formation line length, vu 3 ＝60gH/πnD 1 ηh, wherein H is the design lift, n is the rotation speed, ηh is the hydraulic efficiency at the design point, g is the gravity acceleration value, and a proper attack angle is selected by combining the attack angle delta alpha=2-3 degrees, so that the inlet placement angle of the guide vane is finally determined;
step six, a guide vane outlet mounting angle alpha 4 The value is equal to or less than 80 degrees alpha 4 ≤90°；
Step seven, according to the line radius formulaCalculating line radius and combining the inlet and outlet angles alpha of the guide vanes 3 Alpha and alpha 4 The design of the vane model diagram is unfolded according to the airfoil chord length iota data and the airfoil thickness change rule 791 until the model design is completed;
and step eight, analyzing the model design in the step seven by utilizing CFD flow field analysis, simulating the influence of various complex water inlet conditions on the whole machine efficiency, finding out the region with serious hydraulic loss, analyzing the influence of each design parameter on the region with serious hydraulic loss, readjusting the value range of the parameters to obtain a new model design, and adopting CFD flow field analysis again until the model design meets the requirement.
Preferably, in the first step, the velocity v=3m/s of the water flowing out of the guide vane body flow passage.
Preferably, the guide vane outlet setting angle in the step six is alpha 4 ＝90°。
Compared with the prior art, the invention has the advantages that:
according to the method, the influence of various complex water inlet conditions on the overall efficiency is simulated by adopting CFD fluid analysis, a fluid region with serious hydraulic loss is found out, and then design parameters such as inlet and outlet angles alpha 3 and alpha 4 of a guide vane, a selection range of an attack angle delta alpha, 791 airfoil chord length iota, guide vane height H, line radius R, diffusion angle theta and the like are optimized and adjusted, and then hydraulic model design is carried out; and then, performing simulated field flow field analysis by adopting CFD fluid analysis again, so as to design a guide vane model with higher hydraulic efficiency, and meet the requirements of customers on energy saving indexes and improve the field use stability of products.
The CFD fluid is utilized to analyze the influence of hydraulic loss in the complex working condition flow, so that the hydraulic model of the guide vane is fully and comprehensively considered when the hydraulic model of the guide vane is designed and optimized, and the overall efficiency is improved. The guide vane hydraulic model with the optimal design can effectively improve the efficiency of the whole machine through fluid analysis, greatly increase the cavitation resistance and prolong the service life of the whole machine.
Drawings
FIG. 1 is a schematic view of a vane of the present invention in its installed configuration;
fig. 2 is a cross-sectional view of a guide vane in accordance with the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1 and 2, an embodiment of a method for designing an axial flow pump guide vane body by using a streamline method for CFD flow field analysis according to the present invention includes the following steps:
step one, setting the velocity v of water flowing out of a flow channel of a guide vane body 1 to be 2.5 m/s-3.5 m/s, and according to the valueCalculating the value of the annular cross section S of the water outlet of the guide vane body 1, wherein Q is the design flow, v is the flow velocity, and S is the cross section area; selecting a diffusion angle theta of the guide vane, wherein theta is less than or equal to 10 degrees, and determining the outer diameter D of a flow channel of the guide vane body 1 1 And an inner diameter D 2 The guide vane runner outer diameter D can be introduced according to the existing books 1 The diameter of the shaft is slightly smaller than that of the matched shaft, the diameter of the shaft adopts standard pipes, and the standard pipes corresponding to each caliber pump are determined, so that the outer diameter D is determined firstly 1 The method comprises the steps of carrying out a first treatment on the surface of the Then the inner diameter D is calculated by combining the annular cross section S of the water outlet of the guide vane body 2 Values.
Step two, determining the outer diameter and the inner diameter of the flow channel of the guide vane body 1 according to the step one, and combining the distance L= (0.05-0.1) D between the inlet edge of the guide vane and the outlet edge of the impeller 2 1 Determining the position of the inlet edge of the guide vane; horizontal distance h= (0.4-0.45) D of guide vane outlet edge from guide vane inlet edge 1 Determining the position of the outlet edge of the guide vane;
expanding to check the cross-sectional area of the water flow passage of the guide vane body 1 according to a formula F=2pi Rcb psi 3, wherein Rc is the gravity radius of the cross-sectional area, psi 3 is the displacement coefficient of the vane, and b is the length of a forming line, and the value is a value obtained by actually measuring the forming line drawn when checking the cross-sectional area of the water flow passage; the flow passage water cross section area of the guide vane body 1 is gradually increased from the inlet side to the outlet side, the linear change trend is smooth, and the first step of hydraulic design of the guide vane is finished;
drawing an intermediate streamline according to a formulaCalculating to determine the midpoint of each water cross section forming line, wherein R is j And R is h Respectively representing the outer radius and the inner radius of a forming line drawn when the cross-sectional area of the water flow passage is verified, and sequentially connecting the midpoints of the forming lines to obtain an intermediate streamline;
step five, according to the formulaAngle alpha for inlet of guide vane 3 Calculate Vm 3 =q/2pi Rcb ψ3, where Q is the design flow, b is the formation line length; vu 3 ＝60gH/πnD 1 ηh, wherein H is the design lift, n is the rotation speed, ηh is the hydraulic efficiency at the design point, g is the gravity acceleration value, and a proper attack angle is selected by combining the attack angle delta alpha=2-3 degrees, so that the inlet placement angle of the guide vane is finally determined;
step six, a guide vane outlet mounting angle alpha 4 The value is equal to or less than 80 degrees alpha 4 ≤90°；
Step seven, according to the line radius formulaCalculating line radius and combining the inlet and outlet angles alpha of the guide vanes 3 Alpha and alpha 4 The data of the chord length iota of the wing profile (the chord length iota of the wing profile is the value of chord length which is obtained by directly measuring the inlet and outlet of the linear connection molded line after the radius of the molded line is drawn) is used for expanding the design of the model diagram of the guide vane according to the thickness change rule of the wing profile 791 until the model design is completed;
and step eight, analyzing the model design in the step seven by utilizing CFD flow field analysis, simulating the influence of various complex water inlet conditions on the whole machine efficiency, finding out the region with serious hydraulic loss, analyzing the influence of each design parameter on the region with serious hydraulic loss, readjusting the value range of the parameters to obtain a new model design, and adopting CFD flow field analysis again until the model design meets the requirement.
In the first step, the flow velocity of the water flowing out of the flow passage of the guide vane body 1 is preferably selected to v=3m/S, and the value of the annular cross-sectional area S of the water flowing out of the guide vane body 1 is calculated, wherein the setting angle of the outlet of the guide vane in the sixth step is alpha 4 =90°. The adjustment range can be shortened more quickly when the parameter of the guide vane is required to be adjusted later.
In the seventh step, 791 airfoil thickness variation rules are selected with reference to the following table:
| x/l | 0 | 0.05 | 0.075 | 0.1 | 0.2 | 0.3 | 0.4 |
| δ/δ max | 0 | 0.296 | 0.405 | 0.489 | 0.778 | 0.92 | 0.978 |
| x/l | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 0.95 | 1 |
| δ/δ max | 1 | 0.883 | 0.756 | 0.544 | 0.356 | 0.2 | 1 |
in the eighth step, the CFD flow field is used to analyze the influence of each design parameter on the area with serious hydraulic loss, if the design requirement cannot be met, the parameters need to be selected and adjusted again from the beginning of the step until the model analyzed by the CFD flow field meets the design requirement.
According to the method, the influence of various complex water inlet conditions on the overall efficiency is simulated by adopting CFD fluid analysis, a fluid region with serious hydraulic loss is found out, and then design parameters such as inlet and outlet angles alpha 3 and alpha 4 of a guide vane, a selection range of an attack angle delta alpha, 791 airfoil chord length iota, guide vane height H, line radius R, diffusion angle theta and the like are optimized and adjusted, and then hydraulic model design is carried out; and then, performing simulated field flow field analysis by adopting CFD fluid analysis again, so as to design a guide vane model with higher hydraulic efficiency, and meet the requirements of customers on energy saving indexes and improve the field use stability of products.
The CFD fluid is utilized to analyze the influence of hydraulic loss in the complex working condition flow, so that the hydraulic model of the guide vane is fully and comprehensively considered when the hydraulic model of the guide vane is designed and optimized, and the overall efficiency is improved. The guide vane hydraulic model with the optimal design can effectively improve the efficiency of the whole machine through fluid analysis, greatly increase the cavitation resistance and prolong the service life of the whole machine.
The above embodiments are merely illustrative embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.
Claims (3)
1. The method for designing the axial flow pump guide vane body by adopting the streamline method of CFD flow field analysis is characterized by comprising the following steps of:
setting the velocity v of water flowing out of a guide vane body flow channel at 2.5-3.5 m/S, and calculating the value of the annular cross section S of the water outlet of the guide vane body according to Q=S.v, wherein Q is the designed flow, v is the velocity, and S is the cross section area; selecting a diffusion angle theta of the guide vane, wherein theta is less than or equal to 10 degrees, and determining the outer diameter D of a guide vane body flow channel 1 And an inner diameter D 2 ；
Step two, determining the outer diameter and the inner diameter of the guide vane body flow channel according to the step one, and combining the distance L= (0.05-0.1) D between the inlet edge of the guide vane and the outlet edge of the impeller 1 Determining the position of the inlet edge of the guide vane; horizontal distance h= (0.4-0.45) D of guide vane outlet edge from guide vane inlet edge 1 Determining the position of the outlet edge of the guide vane;
step three, expanding to check the cross-sectional area of the water flow passage of the guide vane body according to a formula F=2pi Rcb psi 3, wherein Rc is the gravity center radius of the water flow section, psi 3 is the displacement coefficient of the vane, and b is the length of a forming line, the water flow passage of the guide vane body is gradually increased from the inlet side to the outlet side, and the water flow passage of the guide vane body is linear and gradually changed, so that the first step of hydraulic design of the guide vane is completed;
drawing an intermediate streamline according to a formulaCalculating to determine the midpoint of each water cross section forming line, wherein R is j And R is h Respectively representing the outer radius and the inner radius of a forming line drawn when the cross-sectional area of the water flow passage is verified, and sequentially connecting the midpoints of the forming lines to obtain an intermediate streamline;
step five, according to the formulaAngle alpha for inlet of guide vane 3 Calculate Vm 3 =q/2pi Rcb ψ3, where Q is the design flow, b is the formation line length, vu 3 ＝60gH/πnD 1 ηh, wherein H is the design lift, n is the rotation speed, ηh is the hydraulic efficiency at the design point, g is the gravity acceleration value, and a proper attack angle is selected by combining the attack angle delta alpha=2-3 degrees, and finallyDetermining a guide vane inlet setting angle;
step six, a guide vane outlet mounting angle alpha 4 The value is equal to or less than 80 degrees alpha 4 ≤90°；
Step seven, according to the line radius formulaCalculating line radius and combining the inlet and outlet angles alpha of the guide vanes 3 Alpha and alpha 4 The design of the vane model diagram is unfolded according to the airfoil chord length iota data and the airfoil thickness change rule 791 until the model design is completed;
and step eight, analyzing the model design in the step seven by utilizing CFD flow field analysis, simulating the influence of various complex water inlet conditions on the whole machine efficiency, finding out the region with serious hydraulic loss, analyzing the influence of each design parameter on the region with serious hydraulic loss, readjusting the value range of the parameters to obtain a new model design, and adopting CFD flow field analysis again until the model design meets the requirement.
2. The method for designing the guide vane body of the axial flow pump by using the streamline method of the CFD flow field analysis according to claim 1, wherein in the first step, the velocity v=3m/s of the water flowing out of the flow channel of the guide vane body.
3. The method for designing the guide vane body of the axial flow pump by adopting the streamline method of CFD flow field analysis as claimed in claim 1, wherein the guide vane outlet setting angle in the step six is alpha 4 ＝90°。
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