CN117272875B - Parameterized design method for lateral air inlet volute of gas turbine - Google Patents

Parameterized design method for lateral air inlet volute of gas turbine Download PDF

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CN117272875B
CN117272875B CN202311561876.9A CN202311561876A CN117272875B CN 117272875 B CN117272875 B CN 117272875B CN 202311561876 A CN202311561876 A CN 202311561876A CN 117272875 B CN117272875 B CN 117272875B
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volute
section
dimensionless
annular
design
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CN117272875A (en
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任晓栋
李雪松
李宇红
顾春伟
李晓晔
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Tsinghua University
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Tsinghua University
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/04—Constraint-based CAD
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Abstract

The parameterization design method of the lateral air inlet volute of the gas turbine can describe the shape of the lateral air inlet volute through establishing geometric parameters and geometric constraints, then set key design parameters, define dimensionless design parameters, obtain required design parameters to be solved through the key design parameters, the dimensionless design parameters and a correlation formula, judge whether the design parameters to be solved meet the geometric constraints according to almost constraints, obtain all the geometric parameters after adjustment, and finally draw a two-dimensional model of the lateral air inlet volute according to a two-dimensional model drawn by the geometric parameters, so that the lateral air inlet volute of the gas turbine can be conveniently and rapidly parameterized and designed, further automatic modeling is realized, design efficiency is improved, design period is shortened, foundation is provided for follow-up optimization design work, and design difficulty of the lateral air inlet volute is reduced.

Description

Parameterized design method for lateral air inlet volute of gas turbine
Technical Field
The application relates to the technical field of lateral air inlet volutes of gas turbines, in particular to a parameterized design method of a lateral air inlet volute of a gas turbine.
Background
Heavy duty gas turbines typically take the form of side entry due to factors such as cold end drive or space limitations. Typically, under standard conditions, the flow losses in the side-entry volute of a heavy duty gas turbine are increased by 500Pa (0.5%), and the power of the gas turbine will be reduced by about 1%. In addition, the distorted airflow formed at the outlet of the lateral air inlet volute can influence the efficiency and stability of the compressor, and further influence the efficiency of the whole compressor.
Early gas turbine lateral air inlet volute designs mainly depend on experiments, performance parameters of the gas turbine including the lateral air inlet volute are obtained through wind tunnel experiments, and manual screening modification is performed, so that time and labor are wasted, and cost is high. Along with the high-speed development of computational fluid dynamics methods and computer hardware, the optimization design method based on the optimization algorithm and CFD solution is widely applied to the design process of the lateral air inlet volute of the gas turbine. The parameterized design method of the lateral air inlet volute of the gas turbine determines the design space and variable scale of the optimization design problem, and is the basis for optimizing the design. However, the design of the lateral air inlet volute is still based on empirical design, and a systematic air inlet volute parameterization design method is lacked.
Disclosure of Invention
Based on the above, it is necessary to provide a parameterized design method of a lateral air intake volute of a gas turbine, aiming at the problems that the existing design method of the lateral air intake volute of the gas turbine cannot realize modeling of automatic adjustment parameters, has low design efficiency and long design period.
The parameterized design method of the lateral air inlet volute of the gas turbine comprises the following steps of:
s100: dividing a lateral air inlet volute into a volute section and an annular convergence section for parametric design, and selecting geometric parameters and geometric constraints to describe the shape of the lateral air inlet volute;
s200: dividing the geometric parameters into key design parameters and design parameters to be solved, and giving the key design parameters;
s300: defining dimensionless design parameters of the volute section according to the geometric parameters;
s400: defining dimensionless design parameters of the annular convergent section according to the geometric parameters,
s500: giving the value of the dimensionless number design parameter of the annular convergence section and the value of the dimensionless number design parameter of the volute section, and calculating the key design parameter, the value of the dimensionless number design parameter of the annular convergence section and the value of the dimensionless number design parameter of the volute section according to a correlation formula corresponding to the dimensionless number design parameter of the annular convergence section and the dimensionless number design parameter of the volute section to obtain the to-be-calculated design parameter;
s600: and adding the geometric constraint in CFD software, and drawing a two-dimensional model of the annular convergence section and the volute section.
S700: and in CFD software, drawing a three-dimensional model of the lateral air inlet volute according to the two-dimensional models of the annular convergence section and the volute section.
According to the parameterized design method of the lateral air inlet volute of the gas turbine, the shape of the lateral air inlet volute can be described through establishment of geometric parameters and geometric constraints, then key design parameters are given, dimensionless design parameters are defined, required design parameters to be solved can be obtained through the key design parameters, the dimensionless design parameters and related formulas, whether the design parameters to be solved meet the geometric constraints or not is judged according to almost constraints, all the geometric parameters are obtained after adjustment, finally a two-dimensional model of the lateral air inlet volute is drawn according to a two-dimensional model drawn by the geometric parameters, and therefore the lateral air inlet volute of the gas turbine can be conveniently and rapidly parameterized, automatic modeling is achieved, design efficiency is improved, design period is shortened, parameterized information of a volute section and an annular convergent section is refined, a basis is provided for follow-up optimization design work, and in follow-up optimization design work, different-up optimization design work can be completed by adjusting the key design parameters, the geometric constraints and the like, and accordingly design difficulty of the lateral air inlet volute is reduced.
In an embodiment, the geometric parameters include: volute inlet lengthaWidth of volute inletbHeight of spiral caseL 0 Spiral case chamfer angleαWidth of volute basecCircle center height of arc at bottom of voluteL R Radius of arc at bottom of spiral caseRInlet diameter of annular convergent sectionD 1 Annular convergent section lengthLFirst annular convergence section line parameterL 1 Line parameters of second annular convergence sectionL 2 Extended length of annular convergent section exitL 3 Diameter of cone bottom of diversion coneD 2 Cone angle of flow guide coneβRadius of transition arc of diversion coneR C Inner diameter of outletD 3 Outer diameter of outletD 4 The distance between the two ends of the circular arc at the bottom of the volute and the center of the volute along the height directionhArea of volute inletS in （S in =ab）；
The geometric constraint includes a first constraint comprising: the annular convergence section molded line is connected by adopting a B spline curve, the two ends of the curve of the annular convergence section molded line are respectively tangent to the straight lines connected with the two ends, and the two ends of the transition circular arc of the guide cone are tangent to the straight lines connected with the two ends of the transition circular arc.
In one embodiment, the key design parameters include: inside diameter of outletD 3 Outer diameter of outletD 4 Height of spiral caseL 0 Area of volute inletS in （S in =ab）。
In an embodiment, the dimensionless design parameters of the volute section include: aspect ratio of volute inletr 1 Area contraction ratio of spiral caser 2 Dimensionless distance between circular arc starting point of side wall of air inlet volute and axial center of flow guiding conee * Depth of dimensionless substratec * Spiral case chamfer angleα。
In one embodiment, the dimensionless design parameter and geometric parameter association in S300 may be expressed by the following formula:r 1 =a/b，r 2 =(a-D 1 )/(2R-2L R -D 1 )，e * =(R-L R -(a-D 1 )/2r 2 )/b，c * =c/b，h=be * 。
in one embodiment, the dimensionless design parameters in S300 include: annular convergent section inlet diameterD 1 * Non-dimensional cone bottom diameter of guide coneD 2 * Flow guideConical transition arc dimensionless radiusR C * Taper angleβDimensionless length of annular convergent sectionL * Dimensionless molded line control parameter of annular convergence sectionL 1 * Dimensionless molded line control parameter of annular convergence sectionL 2 * Dimensionless extension of annular convergent sectionL 3 * 。
In one embodiment, the dimensionless design parameter and geometric parameter association in S400 may be expressed by the following formula:D 1 * = D 1 /D 4 ，D 2 * =D 2 /D 4 ，R C * =R C /D 4 ，L * =L/D 4 ，L 1 * =2L 1 /(D 1 -D 4 )，L 2 * =L 2 /L，L 3 * =L 3 /L。
in an embodiment, the geometric constraint further includes a second constraint, where the second constraint is the radius of the transition arc of the guide coneR C <min{(b+L-(D 2 -D 3 )/2/tanβ)cot(β/2)，(D 2 -D 3 )/2/sinβ/tanβ}。
In an embodiment, given the value of the dimensionless number design parameter of the annular convergent section and the value of the dimensionless number design parameter of the volute section, substituting the value of the key design parameter, the value of the dimensionless number design parameter of the annular convergent section and the value of the dimensionless number design parameter of the volute section into a correlation formula corresponding to the dimensionless number design parameter of the annular convergent section and the dimensionless number design parameter of the volute section to calculate the design parameter to be solved, and judgingR C Whether the geometric constraint is satisfied;
if the transition arc radius of the diversion coneR C Does not satisfy the secondConstraint, the dimensionless radius of the transition arc of the guide cone is adjustedR C * And calculateR C ；
If the transition arc radius of the diversion coneR C The geometric constraint is satisfied, and the transition arc radius of the diversion cone is calculatedR C 。
In an embodiment, the two-dimensional model of the annular convergence section is rotated 360 degrees around the axis of the two-dimensional model and stretched to obtain a three-dimensional model of the annular convergence section, the stretched length of the two-dimensional model of the volute section is used as a reference, the three-dimensional model of the volute section is obtained, the two-dimensional model of the annular convergence section and the two-dimensional model of the volute section are subjected to intersecting Boolean operation to obtain an integral model, and then the three-dimensional model of the lateral air inlet volute is obtained according to the chamfer angle of the volute and the width stretch-cut chamfer of the volute substrate.
Drawings
Fig. 1 is a side view of a side entry volute in an embodiment.
Fig. 2 is a front view of a side-entry volute in an embodiment.
Fig. 3 is a front view of the volute section of fig. 2.
Fig. 4 is an enlarged view of the scroll case of fig. 1.
Fig. 5 is a schematic structural view of the lateral inlet volute of fig. 1.
Description of the embodiments
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.
In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.
The parameterized design method of the lateral air inlet volute of the gas turbine comprises the following steps of:
s100: dividing the lateral air inlet volute into a volute section and an annular convergence section for parametric design, and selecting geometric parameters and geometric constraints to describe the shape of the lateral air inlet volute.
S200: the geometric parameters are divided into key design parameters and design parameters to be solved, and the key design parameters are given.
S300: dimensionless design parameters of the volute section are defined according to the geometric parameters.
S400: dimensionless design parameters of the annular convergent section are defined in accordance with the geometric parameters,
s500: and calculating a relation formula corresponding to the dimensionless design parameters of the annular convergence section and the dimensionless design parameters of the volute section to obtain the design parameters to be solved by setting the values of the dimensionless design parameters of the annular convergence section and the dimensionless design parameters of the volute section, and calculating the key design parameters, the values of the dimensionless design parameters of the annular convergence section and the values of the dimensionless design parameters of the volute section.
S600: in CFD software, geometric constraints are added, and two-dimensional models of the annular convergence section and the volute section are drawn.
S700: in CFD software, a three-dimensional model of the lateral air inlet volute is drawn according to two-dimensional models of the annular convergence section and the volute section.
According to the parameterized design method of the lateral air inlet volute of the gas turbine, the shape of the lateral air inlet volute can be described through establishment of geometric parameters and geometric constraints, then key design parameters are given, dimensionless design parameters are defined, required design parameters to be solved can be obtained through the key design parameters, the dimensionless design parameters and related formulas, whether the design parameters to be solved meet the geometric constraints or not is judged according to almost constraints, all the geometric parameters are obtained after adjustment, finally a two-dimensional model of the lateral air inlet volute is drawn according to a two-dimensional model drawn by the geometric parameters, and therefore the lateral air inlet volute of the gas turbine can be conveniently and rapidly parameterized, automatic modeling is achieved, design efficiency is improved, design period is shortened, parameterized information of a volute section and an annular convergent section is refined, a basis is provided for follow-up optimization design work, and in follow-up optimization design work, different-up optimization design work can be completed by adjusting the key design parameters, the geometric constraints and the like, and accordingly design difficulty of the lateral air inlet volute is reduced.
In order to embody the specific flow of the parameterized design method of the side air inlet volute of the gas turbine in the application, an example is given below.
In this embodiment, the geometric parameters include: volute inlet lengthaWidth of volute inletbHeight of spiral caseL 0 Spiral case chamfer angleαWidth of volute basecCircle center height of arc at bottom of voluteL R Radius of arc at bottom of spiral caseRInlet diameter of annular convergent sectionD 1 Annular convergent section lengthLFirst annular convergence section line parameterL 1 Line parameters of second annular convergence sectionL 2 Extended length of annular convergent section exitL 3 Diameter of cone bottom of diversion coneD 2 Cone angle of flow guide coneβRadius of transition arc of diversion coneR C Inner diameter of outletD 3 Outer diameter of outletD 4 The distance between the two ends of the circular arc at the bottom of the volute and the center of the volute along the height directionhArea of volute inletS in （S in =ab). The geometric constraint includes a first constraint comprising: the annular convergence section molded line is connected by adopting a B spline curve, the two ends of the curve of the annular convergence section molded line are respectively tangent to the straight lines connected with the two ends, and the two ends of the transition circular arc of the guide cone are tangent to the straight lines connected with the two ends of the transition circular arc. And the specific morphology of the lateral air inlet volute is depicted through complete parameters and geometric constraints.
In this embodiment, the key design parameters include: inside diameter of outletD 3 =2640 mmOuter diameter of outletD 4 =1320 mmVolute heightL 0 =9000 mmVolute inlet areaS in =18 m 2 。
In this embodiment, the dimensionless design parameters of the volute section include: aspect ratio of volute inletr 1 =4.5, volute area contraction ratior 2 =2.08, dimensionless distance between the starting point of the inlet volute sidewall arc and the axis of the flow guide conee * Non-dimensional basal depth =0c * =0.53 volute chamfer angleα=10°。
In this embodiment, the dimensionless design parameter and geometric parameter association can be expressed by the following formula:r 1 =a/b，r 2 =(a-D 1 )/(2R-2L R -D 1 )，e * =(R-L R -(a-D 1 )/2r 2 )/b，c * =c/b，h=be * 。
in the present embodiment, the dimensionless design parameters include: annular convergent section inlet diameterD 1 * =0.53, diameter of guide cone non-dimensional cone bottomD 2 * =1.4, the transition circular arc dimensionless radius of the guide coneR C =1.06, guideCone angle of flow coneβ=30°, annular convergent section dimensionless lengthL * =0.51, annular convergent section dimensionless profile control parametersL 1 * =0.61, annular convergent section dimensionless profile control parametersL 2 * =0.65, annular convergent section dimensionless extension lengthL 3 * =0.13。
In this embodiment, the association of the dimensionless design parameters with the geometric parameters in S400 can be expressed by the following formula:D 1 * = D 1 /D 4 ，D 2 * =D 2 /D 4 ，R C * =R C /D 4 ，L * =L/D 4 ，L 1 * =2L 1 /(D 1 -D 4 )，L 2 * =L 2 /L，L 3 * =L 3 /L。
in this embodiment, the geometric constraint further includes a second constraint, where the second constraint is a radius of a transition arc of the guide coneR C <min{(b+L-(D 2 -D 3 )/2/tanβ)cot(β/2)，(D 2 -D 3 )/2/sinβ/tanβ}。
In this embodiment, given the value of the dimensionless number design parameter of the annular convergent section and the value of the dimensionless number design parameter of the volute section, the key design parameter, the value of the dimensionless number design parameter of the annular convergent section, and the value of the dimensionless number design parameter of the volute section are substituted into a correlation formula corresponding to the dimensionless number design parameter of the annular convergent section and the dimensionless number design parameter of the volute section to calculate the design parameter to be calculated, and the judgment is madeR C Whether the geometric constraint is satisfied; if the diversion cone transits the arc radiusR C If the second constraint is not satisfied, adjusting the dimensionless radius of the transition arc of the guide coneR C * And calculateR C If the diversion cone transits the arc radiusR C The geometric constraint is satisfied, and the transition arc radius of the guide cone is calculatedR C 。
Specifically, given the values of dimensionless design parameters of the annular convergent section and the volute section, the geometric parameters are calculated through a correlation formula: volute inlet lengtha=9000 mmVolute inlet widthb=2000 mmVolute base widthc=4770 mmCircle center height of arc at bottom of voluteL R =1696 mmRadius of arc at bottom of voluteR=4809 mmAnnular convergent section inlet diameterD 1 =1886 mmAnnular convergent section lengthL=1346 mmAnnular convergence section line parameterL 1 =832 mmAnnular convergence section line parameterL 2 =875 mmExtended length of annular convergent section exitL 3 =175 mmDiameter of cone bottom of guide coneD 2 =1886 mmRadius of transition arc of guide coneR C =2795 mmThe distance between the two ends of the circular arc at the bottom of the volute and the center of the volute along the height directionh=0, whereinR C <min{(b+L-(D 2 -D 3 )/2/tanβ)cot(β/2)，(D 2 -D 3 )/2/sinβ/tanβAnd therefore satisfy geometric constraints.
Referring to fig. 5, in this embodiment, in CFD software, a three-dimensional model is obtained by rotating and stretching a two-dimensional model of an annular convergence section around its axis, taking the section of an inlet vertical axis of the annular convergence section as a reference, stretching the two-dimensional model of the volute section to obtain a three-dimensional model of the volute section, performing an intersecting boolean operation on the two-dimensional model of the annular convergence section and the two-dimensional model of the volute section to obtain an integral model, and stretching and cutting the chamfer according to the chamfer angle of the volute and the width of the volute substrate, as shown in fig. 1, to obtain a three-dimensional model of the lateral air inlet volute, as shown in fig. 5.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (5)

1. The parameterized design method of the lateral air inlet volute of the gas turbine is characterized by comprising the following steps of:
s100: dividing a lateral air inlet volute into a volute section and an annular convergence section, and selecting geometric parameters and geometric constraints to describe the shape of the lateral air inlet volute; the geometric parameters include: volute inlet lengthaWidth of volute inletbHeight of spiral caseL 0 Spiral case chamfer angleαWidth of volute basecCircle center height of arc at bottom of voluteL R Radius of arc at bottom of spiral caseRInlet diameter of annular convergent sectionD 1 Annular convergent section lengthLFirst annular convergence section line parameterL 1 Line parameters of second annular convergence sectionL 2 Extended length of annular convergent section exitL 3 Diameter of cone bottom of diversion coneD 2 Cone angle of flow guide coneβRadius of transition arc of diversion coneR C Inner diameter of outletD 3 Outer diameter of outletD 4 The distance between the two ends of the circular arc at the bottom of the volute and the center of the volute along the height directionhArea of volute inletS in ，S in =abThe method comprises the steps of carrying out a first treatment on the surface of the The geometric constraint includes a first constraint comprising: b spline curve is adopted for annular convergence section molded lineThe two ends of the curve of the annular convergence section molded line are tangent to the straight lines connected with the two ends respectively, and the two ends of the transition circular arc of the guide cone are tangent to the straight lines connected with the two ends;
s200: dividing the geometric parameters into key design parameters and design parameters to be solved, and giving the key design parameters; the key design parameters include: inside diameter of outletD 3 Outer diameter of outletD 4 Height of spiral caseL 0 Area of volute inletS in ，S in =ab；
S300: defining dimensionless design parameters of the volute section according to the geometric parameters; the dimensionless design parameters of the volute section include: aspect ratio of volute inletr 1 Area contraction ratio of spiral caser 2 Dimensionless distance between circular arc starting point of side wall of air inlet volute and axial center of flow guiding conee * Depth of dimensionless substratec * Spiral case chamfer angleαThe method comprises the steps of carrying out a first treatment on the surface of the The dimensionless design parameter to geometry parameter association can be expressed by the following formula:r 1 =a/b，r 2 =(a-D 1 )/(2R-2L R -D 1 )，e * =(R-L R -(a-D 1 )/2r 2 )/b，c * =c/b，h=be * ；
s400: defining dimensionless design parameters of the annular convergence section according to the geometric parameters; the dimensionless design parameters of the annular convergence segment include: annular convergent section inlet diameterD 1 * Non-dimensional cone bottom diameter of guide coneD 2 * Non-dimensional radius of transition arc of diversion coneR C * Taper angleβDimensionless length of annular convergent sectionL * Dimensionless molded line control parameter of annular convergence sectionL 1 * Dimensionless molded line control parameter of annular convergence sectionL 2 * Dimensionless extension of annular convergent sectionL 3 * The method comprises the steps of carrying out a first treatment on the surface of the The dimensionless design parameter to geometry parameter association can be expressed by the following formula:D 1 * =D 1 /D 4 ，D 2 * =D 2 /D 4 ，R C * =R C /D 4 ，L * =L/D 4 ，L 1 * =2L 1 /(D 1 -D 4 )，L 2 * = L 2 /L，L 3 * =L 3 /Lthe method comprises the steps of carrying out a first treatment on the surface of the The geometric constraint further comprises a second constraint, wherein the second constraint is the transition arc radius of the guide coneR C <min{(b+L-(D 2 -D 3 )/2/tanβ)cot(β/2)，(D 2 -D 3 )/2/sinβ/tanβ}；
S500: giving the value of the dimensionless design parameter of the annular convergence section and the value of the dimensionless design parameter of the volute section, substituting the key design parameter, the value of the dimensionless design parameter of the annular convergence section and the value of the dimensionless design parameter of the volute section into a correlation formula corresponding to the dimensionless design parameter of the annular convergence section and the dimensionless design parameter of the volute section to calculate the design parameter to be calculated, and judgingR C Whether the geometric constraint is satisfied;
if the transition arc radius of the diversion coneR C If the second constraint is not satisfied, adjusting the dimensionless radius of the transition arc of the guide coneR C * And calculateR C ；
If the transition arc radius of the diversion coneR C The geometric constraint is satisfied, and the transition arc radius of the diversion cone is calculatedR C ；
S600: adding the geometric constraint in CFD software, and drawing a two-dimensional model of the annular convergence section and the volute section;
s700: and in CFD software, drawing a three-dimensional model of the lateral air inlet volute according to the two-dimensional models of the annular convergence section and the volute section.
2. The method of parameterized design of a gas turbine side-entry volute of claim 1, wherein the key design parameters include: inside diameter of outletD 3 =2640 mmOuter diameter of outletD 4 =1320 mmVolute heightL 0 =9000 mmVolute inlet areaS in =18 m 2 。
3. The method of parameterizing a gas turbine side-entry volute of claim 1, wherein the dimensionless design parameters of the volute section include: aspect ratio of volute inletr 1 =4.5, volute area contraction ratior 2 =2.08, dimensionless distance between the starting point of the inlet volute sidewall arc and the axis of the flow guide conee * Non-dimensional basal depth =0c * =0.53 volute chamfer angleα=10°。
4. The method for parameterized design of a gas turbine side-entry volute of claim 1, wherein the dimensionless design parameters include: annular convergent section inlet diameterD 1 * =0.53, diameter of guide cone non-dimensional cone bottomD 2 * =1.4, the transition circular arc dimensionless radius of the guide coneR C Cone angle of guide cone =1.06β=30°, annular convergent section dimensionless lengthL * =0.51, annular convergent section dimensionless profile control parametersL 1 * =0.61, annular convergent section dimensionless profile control parametersL 2 * =0.65, annular convergent section dimensionless extension lengthL 3 * =0.13。
5. The parameterized design method of a lateral air intake volute of a gas turbine according to claim 1, wherein in CFD software, a three-dimensional model of the annular convergence section is obtained after the two-dimensional model is rotated 360 degrees around an axis of the annular convergence section and stretched, a three-dimensional model of the volute section is obtained by taking an inlet vertical axis section of the annular convergence section as a reference, a two-dimensional model of the volute section and a two-dimensional model of the volute section are subjected to intersecting boolean operation to obtain an integral model, and then the three-dimensional model of the lateral air intake volute is obtained according to a spiral casing chamfer angle and a spiral casing base width stretching and cutting chamfer section.
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