CN115098958B - Air-cooled turbine guide vane modeling method for exhausting air at suction side - Google Patents
Air-cooled turbine guide vane modeling method for exhausting air at suction side Download PDFInfo
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- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
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Abstract
The invention aims to provide a method for molding a guide vane of an air-cooled turbine exhausting gas at a suction side, which comprises the following steps: 1. traditional turbine aerodynamics, cooling design and blade modeling; 2. calculating and analyzing a full three-dimensional numerical value; 3. reducing the radius of the trailing edge of each section, and adjusting the outer molded line of the blade near the trailing edge; 4. designing a short exhaust tail edge of a suction side of the blade; 5. constructing a section structure of a suction side exhaust tail edge; 6. establishing a three-dimensional blade profile of a suction surface trailing edge blade; 7. establishing an exhaust connecting rib; 8. and performing full three-dimensional numerical calculation and analysis to obtain the blade profile loss and blade temperature data of the turbine guide blade. The method for molding the suction side exhaust guide vane can reduce the thickness of the tail edge of the turbine guide vane, thereby reducing the blade profile loss of the turbine guide vane, improving the pneumatic performance of the turbine guide vane, improving the efficiency of the turbine and the whole machine set, reducing the energy consumption and fundamentally solving the problems that the guide vane wake loss is large and the pneumatic efficiency of the turbine is difficult to meet the requirement in the traditional tail edge middle slit exhaust mode.
Description
Technical Field
The invention relates to a design method of a turbine of a gas turbine, in particular to a modeling method of a turbine guide vane.
Background
The gas turbine has the advantages of high power density, high starting speed, flexible fuel and the like, is widely applied to the fields of industrial and offshore platform power generation, natural gas transportation, petrochemical industry, metallurgy and the like, and can also be used as a main power device of airplanes, ships and ground vehicles.
In order to achieve higher cycle efficiency and higher power in modern high-performance gas turbines, the initial temperature of the gas (turbine inlet temperature) is continuously increased. With the increasing inlet temperature of the turbine, the operating temperature of the turbine is far higher than the melting point temperature of the blade material, for example, the inlet gas temperature of the turbine of the most advanced gas turbine which is put into operation at present reaches 1600 ℃, and the inlet temperature of the turbine of the advanced aircraft engine is more than 1800 ℃. There are three main measures to ensure that a gas turbine blade can be safely and reliably operated for a long period of time in such high temperature environments: firstly, constantly improve the heat-resisting grade of turbine blade material, secondly adopt advanced cooling technology in order to reduce the blade temperature, thirdly constantly improve turbine blade thermal barrier coating's thermal-insulated effect. In recent years, the increase in turbine inlet temperature has been attributed primarily to the increase in turbine cooling design levels, and secondarily to the development of high performance heat resistant alloys and coating materials and advances in manufacturing process levels. It is clear that turbine blade cooling plays a crucial role in increasing turbine inlet temperature and improving gas turbine performance.
In recent years, with the continuous progress of design technology and the continuous development of computational fluid mechanics, a full three-dimensional optimization design means is continuously applied to a turbine cooling design process, a turbine cooling design system, a design means and a method are continuously enriched and perfected, the advanced design technology and a cooling structure continuously promote the increase of the turbine inlet temperature, and the shape of a turbine blade cooling channel is more complicated. In order to meet the requirements of energy conservation and emission reduction, the performance of modern gas turbines is continuously improved, the cooling and pneumatic performance of the turbines are required to be continuously improved, and the service life and the reliability of turbine blades are continuously improved. However, cooling techniques based on conventional turbine blade trailing edge exhaust structures have difficulty in improving turbine blade aerodynamic performance while reducing blade trailing edge temperatures.
Although scholars and researchers at home and abroad have carried out a great deal of research on efficient cooling and aerodynamic design of turbine blades and have certain knowledge on improving cooling and aerodynamic performance of the turbine blades and disclosing a cooling flow mechanism inside a turbine blade body, the research does not pay attention to how to improve blade profile loss of the turbine blades while improving cooling of the turbine blade body, and reports on reducing metal temperature of the turbine blade tail edge and improving aerodynamic performance of the turbine blade through an exhaust structure form on a suction side of the guide blade tail edge are fresh. Researchers hope to have an advanced trailing edge structure form modeling method which can solve the problem that the trailing edge of the turbine guide vane is difficult to cool and can effectively improve the aerodynamic performance of the turbine guide vane.
Disclosure of Invention
The invention aims to provide a method for modeling a guide vane of an air-cooled turbine exhausting at a suction side, which can solve the problems that the guide vane has large wake loss in the traditional tail edge middle cleft exhaust mode, the aerodynamic efficiency of the turbine is difficult to meet the requirements and the like.
The purpose of the invention is realized as follows:
the invention discloses a method for molding a suction side exhaust air-cooled turbine guide vane, which is characterized by comprising the following steps of:
(1) Carrying out flow thermal coupling calculation with a cooling channel on the turbine blade obtained by adopting a conventional design method to obtain data of blade profile loss and blade metal temperature of the turbine guide blade, and taking the data result as a comparison basis for improving the data result into a calculation result of exhaust design at the suction side of a trailing edge;
(2) Keeping the profile of the front edge of the turbine guide vane blade, the profile of the blade back and the profile of the middle front part of the blade basin unchanged;
adjusting the radius of the tail edge of each section of the turbine guide vane blade, reducing the radius of the tail edge of each section of the turbine guide vane blade to 0.5-1 mm, adjusting the molded line near the tail edge of the rear part of each section of the blade basin to obtain the shape of the adjusted turbine guide vane blade, and defining the tail edge as a long exhaust tail edge;
(3) Keeping an internal cooling channel and an internal cooling structure at the middle front part of a turbine guide vane blade body unchanged, adjusting a cooling exhaust structure near the tail edge of a guide vane blade, namely a long exhaust tail edge, and arranging a short exhaust tail edge at the L-length position along a blade back molded line at the tail edge, namely the long exhaust tail edge, after the radius is reduced;
(4) Measuring and recording an included angle A between the long exhaust tail edge and the short exhaust tail edge, and adjusting a distance L between the long exhaust tail edge and the short exhaust tail edge to obtain a suction side exhaust tail edge cascade section structure;
(5) Keeping an internal cooling channel and an internal cooling structure at the middle front part of the turbine guide vane blade body unchanged, establishing an exhaust channel arranged on the suction side for exhaust of the tail edge of the guide vane blade, and constructing the blade with the internal cooling channel and the cooling structure in the step (4) into a new brand-new guide vane blade with the tail edge exhaust structure on the suction side;
(6) Uniformly arranging exhaust connecting ribs with the distance of H between the long exhaust tail edge and the short exhaust tail edge along the height direction of the blade;
(7) Carrying out thermal coupling calculation with a cooling channel on the turbine guide vane obtained by adopting a suction side exhaust gas cooling turbine guide vane model design method to obtain adjusted turbine guide vane profile loss and vane metal temperature data;
(8) If the blade profile loss and the blade metal temperature data of the turbine guide blade obtained in the step (7) meet the preset standard, obtaining the blade profile loss and the blade metal temperature data of the turbine guide blade;
(9) And (4) if the blade profile loss and the blade metal temperature data of the turbine guide blade obtained in the step (7) do not meet the preset standard, repeating the steps (2) to (7) until the blade profile loss and the blade metal temperature data of the turbine guide blade meet the preset standard.
The present invention may further comprise:
1. the long exhaust tail edge, the short exhaust tail edge and the exhaust connecting rib are connected into a whole in sequence.
2. The long exhaust tail edge is obtained by following the profile of the suction surface of the guide vane blade.
3. And (4) the distance L between the long exhaust tail edge and the short exhaust tail edge in the step (4) is within 5 mm.
4. And (4) an included angle A between the long exhaust tail edge and the short exhaust tail edge in the step (4) is within 8 degrees.
The invention has the advantages that: on the basis of fully utilizing conventional turbine pneumatic, cooling and blade modeling methods and processes, the turbine guide blade tail edge cooling air flow field structure and heat exchange characteristics are reorganized by reforming the guide blade tail edge suction side exhaust mode and combining a full three-dimensional computing technology.
By adopting the turbine guide vane designed by the invention, compared with an exhaust structure at the tail edge of the middle cleft seam, the exhaust structure at the tail edge of the guide vane reduces the wake loss by 50% under the condition that the temperature of the tail edge of the guide vane is unchanged on the premise that the flow rate of cooling air at the tail edge of the guide vane is the same.
Drawings
FIG. 1a is a schematic view of a traditional turbine guide vane tail edge middle slit exhaust structure, and FIG. 1b is a partial enlarged view of FIG. 1 a;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a schematic view of the turbine vane trailing edge exhaust configuration of the present invention;
FIG. 4 is a schematic cross-sectional view of a turbine vane trailing edge exhaust structure of the present invention;
FIG. 5a is a schematic view of the dimensions and angles of the turbine vane trailing edge exhaust structure of the present invention, and FIG. 5b is a partial enlarged view of FIG. a;
FIG. 6 is a turbine cascade channel schematic diagram of a turbine vane trailing edge exhaust structure designed according to the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1a to fig. 6, the first embodiment: the method of the embodiment comprises the following specific processes:
the invention relates to a method for molding a suction side exhaust air-cooled turbine guide vane, which is based on the conventional aerodynamic design, cooling structure design and blade molding method of a turbine blade. Following conventional turbine blade aerodynamic design, cooling structure design, and blade contouring methods, turbine vane blades without suction side exhaust gas treatment are obtained (see FIG. 1).
As shown in FIG. 1, the guide vane tail edge adopts an intermediate slit exhaust structure.
On the basis, the following steps are needed (see fig. 2):
firstly, carrying out flow thermal coupling calculation with a cooling channel on a turbine blade (see figure 1) obtained by a conventional design method by utilizing full three-dimensional numerical simulation software (such as CFX) to obtain data of blade profile loss and blade metal temperature of a turbine guide blade, and taking the data result as a comparison basis for improving the data result into a calculation result of exhaust design on a trailing edge suction side;
keeping the shape front edge molded line, the shape back molded line and the shape of the middle front part molded line of the blade basin of the turbine guide blade unchanged;
adjusting the radius of the tail edge of each section of the turbine guide vane blade (see fig. 3 and 4), reducing the radius of the tail edge of each section of the turbine guide vane blade to 0.5-1 mm, adjusting the molded line near the tail edge of the rear part of each section of the vane basin to obtain the shape of the adjusted turbine guide vane blade, and defining the tail edge as a long exhaust tail edge 1 for the convenience of distinguishing;
step three, based on the shape of the guide vane blade adjusted in the step two, keeping an internal cooling channel and an internal cooling structure at the middle front part of the turbine guide vane blade body unchanged, adjusting a cooling exhaust structure near the tail edge (long exhaust tail edge 1) of the guide vane blade, and arranging a short exhaust tail edge 2 at the length position L (shown in figure 5) along the blade back molded line at the position of the tail edge (long exhaust tail edge 1) with the reduced radius;
step four, on the basis of the step three, measuring and recording an included angle A (shown in figure 5) between the long exhaust tail edge 1 and the short exhaust tail edge 2, and properly adjusting the distance L (shown in figure 5) between the long exhaust tail edge 1 and the short exhaust tail edge 2 and the width C of the exhaust channel 4 to ensure that the numerical value of the included angle A (shown in figure 5) is reasonable, so as to obtain the exhaust tail edge cascade section structure on the suction side;
step five, keeping an internal cooling channel and an internal cooling structure at the middle front part of the turbine guide vane blade body unchanged, establishing an exhaust channel 5 of the guide vane blade tail edge exhaust arrangement on the suction side by utilizing three-dimensional modeling software (such as UG) and through the mixing function of each section on the basis of the exhaust structure of the suction side of the tail edge of each section obtained in the step four, and constructing the blade with the internal cooling channel and the cooling structure in the step four into a new guide vane blade with the exhaust structure of the tail edge of the suction side through the Boolean operation function;
step six, on the basis of the brand new guide vane blade with the suction side tail edge exhaust structure obtained in the step five, uniformly arranging exhaust connecting ribs 3 with the distance H (shown in figure 3) between the long exhaust tail edge 1 and the short exhaust tail edge 2 along the height direction of the blade, and connecting the external molded lines of the exhaust connecting ribs 3 with the molded lines of the blade back of the blade obtained in the step two;
performing flow thermal coupling calculation with a cooling channel on the turbine guide vane obtained by adopting the suction side exhaust gas cooling turbine guide vane model design method by using full three-dimensional numerical simulation software (such as CFX) to obtain adjusted turbine guide vane profile loss and vane metal temperature data;
step eight, if the blade profile loss and the blade metal temperature data of the turbine guide blade obtained in the step seven meet the preset standard (the blade profile loss of the guide blade is not less than 40%, and the blade metal temperature is lower than the allowable material temperature), obtaining the blade profile loss and the blade metal temperature data of the turbine guide blade;
and if the blade profile loss and the blade metal temperature data of the turbine guide blade obtained in the step seven do not meet the preset standard (the blade profile loss is not less than 40% and the blade metal temperature is lower than the material allowable temperature), repeating the step two to the step seven until the blade profile loss and the blade metal temperature data of the turbine guide blade reach the preset standard (the blade profile loss is not less than 40% and the blade metal temperature is lower than the material allowable temperature).
The second embodiment is as follows: in addition to the first embodiment, the long exhaust tail edge 1, the short exhaust tail edge 2, and the exhaust connecting rib 3 are connected in sequence to form a whole.
The third concrete implementation mode: on the basis of the first embodiment, the long exhaust trailing edge 1 is obtained by following the suction surface line of the guide vane blade.
The fourth concrete implementation mode: on the basis of the first embodiment, the distance L between the long and middle exhaust tail edges 1 and the short exhaust tail edges 2 of the fourth step is within 5mm, and the included angle (a) between the long and middle exhaust tail edges 1 and the short exhaust tail edges 2 of the fourth step is within 8 degrees.
The fifth concrete implementation mode: in one embodiment, the full three-dimensional numerical simulation software is CFX software.
The sixth specific implementation mode: on the basis of the first embodiment, the three-dimensional modeling software is UG software.
Claims (5)
1. A method for molding air-cooled turbine guide vanes with suction side exhaust is characterized in that:
(1) Carrying out thermal coupling calculation on the turbine blade with the cooling channel obtained by adopting a conventional design method to obtain data of blade profile loss and blade metal temperature of the turbine guide blade, and taking the data result as a comparison basis for improving the data result into a calculation result of exhaust design on the suction side of the trailing edge; the conventional design method is based on the fact that the tail edge of the guide vane of the middle cleft exhaust structure is adopted as an improved foundation;
(2) Keeping the profile of the front edge of the turbine guide vane blade, the profile of the blade back and the profile of the middle front part of the blade basin unchanged;
adjusting the radius of the tail edge of each section of the turbine guide vane blade, reducing the radius of the tail edge of each section of the turbine guide vane blade to 0.5-1 mm, adjusting the molded line near the tail edge of the rear part of each section of the vane basin to obtain the shape of the adjusted turbine guide vane blade, and defining the tail edge as a long exhaust tail edge;
(3) Keeping an internal cooling channel and an internal cooling structure at the middle front part of a turbine guide vane blade body unchanged, adjusting a cooling exhaust structure near the tail edge of the guide vane blade, namely the long exhaust tail edge, and arranging a short exhaust tail edge at the L-length position along the blade back molded line at the tail edge, namely the long exhaust tail edge, with the radius reduced;
(4) Measuring and recording an included angle A between the long exhaust tail edge and the short exhaust tail edge, and adjusting a distance L between the long exhaust tail edge and the short exhaust tail edge to obtain a suction side exhaust tail edge cascade section structure;
(5) Keeping an internal cooling channel and an internal cooling structure at the middle front part of the turbine guide vane blade body unchanged, establishing an exhaust channel arranged on the suction side for exhaust of the tail edge of the guide vane blade, and constructing the blade with the internal cooling channel and the cooling structure in the step (4) into a new brand-new guide vane blade with the tail edge exhaust structure on the suction side;
(6) Uniformly arranging exhaust connecting ribs with the distance of H between the long exhaust tail edge and the short exhaust tail edge along the height direction of the blade;
(7) Carrying out thermal flow coupling calculation with a cooling channel on the turbine guide vane obtained by adopting a suction side exhaust gas cooling turbine guide vane model design method to obtain adjusted turbine guide vane profile loss and vane metal temperature data;
(8) If the blade profile loss and the blade metal temperature data of the turbine guide blade obtained in the step (7) meet the preset standard, obtaining the blade profile loss and the blade metal temperature data of the turbine guide blade;
(9) And (4) if the blade profile loss and the blade metal temperature data of the turbine guide blade obtained in the step (7) do not meet the preset standard, repeating the steps (2) to (7) until the blade profile loss and the blade metal temperature data of the turbine guide blade meet the preset standard.
2. The method of claim 1, wherein the method comprises the steps of: the long exhaust tail edge, the short exhaust tail edge and the exhaust connecting rib are connected into a whole in sequence.
3. The method of claim 1, wherein the method comprises the steps of: the long exhaust tail edge is obtained by following the molded line of the suction side of the guide vane blade.
4. The method of claim 1, wherein the method comprises the steps of: and (4) the distance L between the long exhaust tail edge and the short exhaust tail edge in the step (4) is within 5 mm.
5. The method of claim 1, wherein the method comprises the steps of: and (4) an included angle A between the long exhaust tail edge and the short exhaust tail edge in the step (4) is within 8 degrees.
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| CN109578085A (en) * | 2018-12-26 | 2019-04-05 | 中国船舶重工集团公司第七0三研究所 | A method of it is tilted by guide vane and weakens the unsteady active force of turbine rotor blade |
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| JP6685800B2 (en) * | 2016-03-31 | 2020-04-22 | 三菱重工業株式会社 | Turbine blade design method, turbine blade manufacturing method, and turbine blade |
| CN110030036B (en) * | 2019-05-10 | 2021-10-22 | 沈阳航空航天大学 | Impact split-joint air film cooling structure of turbine blade tail edge |
| CN110925027A (en) * | 2019-11-29 | 2020-03-27 | 大连理工大学 | Turbine blade trailing edge tapered inclined exhaust split structure |
| CN213478403U (en) * | 2020-11-09 | 2021-06-18 | 中国航发商用航空发动机有限责任公司 | Gas turbine, gas turbine assembly and cooling blade thereof |
| CN113374534B (en) * | 2021-06-09 | 2022-08-30 | 中国航发湖南动力机械研究所 | Turbine blade trailing edge split seam modeling method |
| CN114060102B (en) * | 2021-11-10 | 2022-11-04 | 北京航空航天大学 | Method and device for determining outlet metal angle of guide vane blade |
| CN114528656B (en) * | 2022-01-26 | 2023-08-11 | 哈尔滨工业大学 | Air-cooled turbine simulation method and device based on three-dimensional-quasi three-dimensional variable dimension coupling |
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| CN109578085A (en) * | 2018-12-26 | 2019-04-05 | 中国船舶重工集团公司第七0三研究所 | A method of it is tilted by guide vane and weakens the unsteady active force of turbine rotor blade |
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