CN111691929A - Turbine blade top active flow control method based on sweep frequency type ejector - Google Patents
Turbine blade top active flow control method based on sweep frequency type ejector Download PDFInfo
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- CN111691929A CN111691929A CN202010439258.7A CN202010439258A CN111691929A CN 111691929 A CN111691929 A CN 111691929A CN 202010439258 A CN202010439258 A CN 202010439258A CN 111691929 A CN111691929 A CN 111691929A
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- Prior art keywords
- frequency
- turbine
- sweep
- flow
- vortex
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Classifications
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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
- F01D17/00—Regulating or controlling by varying flow
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
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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
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
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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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
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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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
- F01D5/186—Film 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a turbine blade top active flow control method based on a sweep frequency type ejector, which comprises the following steps of: acquiring a three-dimensional flow field structure in the turbine and the action frequency of each vortex system; selecting a sweep frequency type ejector meeting the conditions according to the three-dimensional flow characteristics of the high-performance turbine; and establishing the correlation between the structural frequency of the vortex system in the blade cascade and the frequency of the sweep-frequency ejector, and analyzing the action rule and the action mechanism of the unsteady jet flow on the leakage vortex and the channel vortex in the turbine blade cascade to send a control command. According to the method, the single frequency-sweeping ejector is added at a proper position on the wall surface of the turbine casing, so that the passing of the leakage flow at the blade top can be effectively controlled, the control range is wider, the generation and development of the clearance leakage vortex can be effectively slowed down, the aerodynamic performance of the turbine blade cascade is improved, different sweeping frequencies are realized through different inlet pressures of the frequency-sweeping ejectors, the frequency of the main flow in the flow field is further controlled, and the whole flow field is more orderly.
Description
Technical Field
The invention relates to the technical field of gas flow control of turbine blade tips in impeller machinery, in particular to a turbine blade tip active flow control method based on a sweep frequency type ejector.
Background
The research of the unsteady-field active flow control method is one of the main hotspots of the aerospace research, and has attracted extensive attention in the field of internal flow, wherein the swept-frequency jet technology is one of unsteady active flow control methods.
In recent years, swept-frequency ejectors have been widely studied as a new flow control method. The sweep-frequency type jet device has the characteristics of high frequency, high momentum change range, size scalability and the like, can jet out a stable air source at a certain oscillation frequency, has a simple structure and does not have valves and other components, and has been successfully used for controlling the flow separation on wings and wind blades in recent years.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention aims to provide a turbine blade tip active flow control method based on a sweep frequency type ejector, which can reduce the size of clearance leakage vortex, reduce the aerodynamic loss in a turbine blade and improve the aerodynamic performance of a turbine stage.
In order to achieve the above object, an embodiment of the present invention provides a turbine blade tip active flow control method based on a swept-frequency ejector, including the following steps: acquiring a three-dimensional flow field structure in the turbine and the action frequency of each vortex system; selecting a sweep frequency type ejector meeting the conditions according to the three-dimensional flow characteristics of the high-performance turbine; and establishing the correlation between the structural frequency of the vortex system in the blade cascade and the frequency of the sweep-frequency ejector, and analyzing the action rule and the action mechanism of the unsteady jet flow on the leakage vortex and the channel vortex in the turbine blade cascade to send a control command.
According to the turbine blade top active flow control method based on the frequency sweeping type ejector, the frequency sweeping type ejector is used as a non-constant field active flow control method to be applied to leakage flow control of the turbine blade top, passage of clearance leakage flow is restrained by emitting swept high-frequency high-energy fluid through the frequency sweeping type pulsating ejector, the size of clearance leakage vortex is reduced, aerodynamic loss in turbine blades is reduced, and the aerodynamic performance of a turbine stage is improved; the frequency locking of the non-fixed-field vortex system time domain in the turbine can be realized through the mutual matching of the reasonable jet flow sweeping frequency and the vortex system in the flow field, and the sweep frequency type jet device is applied to a high-load turbine, so that the gas-mode cooling can be effectively carried out on the end wall and the blade top while the turbine-grade aerodynamic performance is improved.
In addition, the turbine blade tip active flow control method based on the swept-frequency type jet device according to the embodiment of the invention can also have the following additional technical characteristics:
further, in one embodiment of the present invention, the satisfaction conditions are that the size, the sweep frequency, and the injection position all satisfy corresponding preset conditions.
Further, in an embodiment of the present invention, the method further includes: the swept frequency ejectors are arranged at different locations of the tip case such that different swept frequency jet locations control leakage fluid in different areas within the tip.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of the working principle of a swept frequency ejector according to an embodiment of the invention;
FIG. 2 is a flow chart of a turbine blade tip active flow control method based on a swept-frequency ejector according to an embodiment of the invention;
FIG. 3 is a schematic diagram of the placement of several swept frequency jet devices according to an embodiment of the invention;
FIG. 4 is a schematic view of turbine cascade flow after addition of a swept frequency ejector according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a mechanism for controlling the leakage flow at the tip of a turbine blade by using a swept-frequency ejector according to an embodiment of the 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, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The present invention is based on the recognition and discovery by the inventors of the following problems:
compared with the traditional steady active flow control means, the sweep frequency type jet device has larger influence range on the flow field, and the control effect of the sweep frequency type jet device is greatly superior to that of the steady flow control by adopting reasonable and proper non-steady flow control design parameters. As shown in fig. 1, the working principle of the sweep jet device is that when fluid flows into the interior of the sweep jet device, the fluid always adheres to one of two coanda surfaces in the interior of the sweep jet device due to the coanda effect. And when the fluid in the corresponding feedback channel flows out of the feedback channel, the flow direction of the main flow fluid in the sweep frequency type ejector is changed, so that the main flow fluid is attached to the other coanda surface, and the aim of sweep frequency ejection is fulfilled by the reciprocating circulation. The sweep frequency type ejector realizes the purpose of active flow control through the interaction of certain sweep frequency and fluid in a flow field.
Aiming at the problem of flow loss caused by leakage of a blade top clearance in a turbine moving blade, the embodiment of the invention introduces a sweep frequency ejector into a method for controlling the flow problem of the blade top clearance of the turbine as a new unsteady active flow control technology. The single sweep frequency ejector is added at a proper position on the wall surface of the turbine casing, so that the passing of leakage flow of the blade tip can be effectively controlled, the control range is wider, the generation and development of clearance leakage vortex can be effectively slowed down, and the pneumatic performance of the turbine blade cascade is improved. And different sweep frequencies are realized through different inlet pressures of the sweep ejector, and the frequency of the mainstream fluid in the flow field is further controlled, so that the whole flow field is more ordered. The active flow control method in the turbine movable blade is enriched, theoretical technical reserve can be provided for the direction of improving the aerodynamic performance of the turbine, and the active flow control method has use engineering value.
The active flow control method of the turbine blade tip based on the sweep-frequency type ejector proposed according to the embodiment of the invention is described below with reference to the accompanying drawings.
FIG. 2 is a flow chart of a turbine blade tip active flow control method based on a swept-frequency ejector according to an embodiment of the invention.
As shown in fig. 2, the method for controlling the active flow of the turbine blade tip based on the swept-frequency type ejector comprises the following steps:
in step S201, a three-dimensional flow field structure in the turbine and an operating frequency of each vortex system are acquired.
It can be understood that the flow field of the high-performance turbine is preliminarily simulated and measured by means of theoretical analysis, numerical simulation, experimental measurement and the like. And acquiring a detailed three-dimensional flow field structure in the turbine and the action frequency of each vortex system.
In step S202, a sweep-frequency ejector satisfying the condition is selected according to the three-dimensional flow characteristics of the high-performance turbine.
Wherein, in one embodiment of the invention, the conditions are satisfied such that the size, the sweep frequency and the injection position all satisfy corresponding preset conditions.
It can be understood that the method of the embodiment of the present invention is a jet flow technology that applies the frequency sweep type jet device as an unsteady active flow control method to control the flow of the blade tip clearance on the turbine casing, and the high-energy fluid ejected by the frequency sweep type jet device is used to block the leakage flow from passing through the blade tip area.
Specifically, according to the three-dimensional flow characteristics of the high-performance turbine, the sweep-frequency ejector with proper size, sweep frequency and ejection position is selected, so that a reasonable sweep-frequency jet scheme in a complex three-dimensional flow channel comprehensively considering aerodynamic and heat transfer characteristics is established according to the matching relation between the design parameters of unsteady flow control and the actual flow field structure and the basic design requirements, and the three-dimensional separation in the flow field is improved.
Further, in an embodiment of the present invention, the method further includes: the swept frequency ejectors are arranged at different locations of the tip case such that different swept frequency jet locations control leakage fluid in different areas within the tip.
It is appreciated that embodiments of the present invention may deploy swept frequency ejectors at different locations of the tip case, as shown in FIG. 3, with different swept frequency jet locations controlling leakage fluid at different areas within the tip.
In step S203, a correlation between the frequency of the cascade inner vortex structure and the frequency of the sweep-frequency ejector is established, and the law and mechanism of action of the unsteady jet on the turbine cascade inner leakage vortex and the channel vortex are analyzed to send a control instruction.
It can be understood that the aerodynamic performance of the turbine blade cascade is further improved by establishing an unsteady coupling relation between the parameters of the frequency-sweeping type jet ejector and the vortex system structure in the flow field. The schematic flow diagram of the turbine blade cascade after the frequency sweep ejector is added is shown in fig. 4, and the schematic mechanism diagram of the frequency sweep ejector for controlling the turbine blade tip leakage flow is shown in fig. 5.
Specifically, the correlation between the structural frequency of the vortex system in the blade cascade and the frequency of the sweep-frequency ejector is established, and the action rule and the action mechanism of the unsteady jet flow on the vortex systems such as the leakage vortex, the channel vortex and the like in the turbine blade cascade are analyzed, so that the leakage vortex loss and the channel vortex loss of the blade cascade are controlled to the greatest extent through unsteady jet flow excitation, and the aerodynamic performance of the turbine is improved.
It should be noted that the embodiment of the present invention is applied to the field of gas flow control of a turbine blade tip in an impeller machine, and particularly relates to a flow control effect of a sweep frequency type ejector on a flow field in a gap of the turbine blade tip in turbine blade tip flow control of subsonic speed, high subsonic speed, transonic speed, and the like.
In summary, in a high performance turbine, the aerodynamic loss caused by the tip clearance occupies a significant part of the overall loss of the turbine, and the gap leakage vortex caused by the tip clearance and the vortex system of the upper channel vortex are coupled to further deteriorate the tip flow. The embodiment of the invention introduces the sweep frequency ejector as a new unsteady active flow control technology into the control of the turbine blade top clearance flow. The single sweep frequency ejector is added at a proper position on the wall surface of the turbine casing, so that the passing of leakage flow of the blade tip can be effectively controlled, the control range is wider, the generation and development of clearance leakage vortex can be effectively slowed down, and the pneumatic performance of the turbine blade cascade is improved. And different sweep frequencies are realized through different inlet pressures of the sweep ejector, and the frequency of the mainstream fluid in the flow field is further controlled, so that the whole flow field is more ordered.
According to the turbine blade top active flow control method based on the frequency sweeping type ejector, which is provided by the embodiment of the invention, the frequency sweeping type ejector is used as a non-constant field active flow control method to be applied to the leakage flow control of the turbine blade top, the passage of clearance leakage flow is inhibited by emitting swept high-frequency high-energy fluid through the frequency sweeping type pulsating ejector, the size of clearance leakage vortex is reduced, the pneumatic loss in a turbine blade is reduced, and the pneumatic performance of a turbine stage is improved; the frequency locking of the non-fixed-field vortex system time domain in the turbine can be realized through the mutual matching of the reasonable jet flow sweeping frequency and the vortex system in the flow field, and the sweep frequency type jet device is applied to a high-load turbine, so that the gas-mode cooling can be effectively carried out on the end wall and the blade top while the turbine-grade aerodynamic performance is improved.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (3)
1. A turbine blade top active flow control method based on a sweep frequency type jet device is characterized by comprising the following steps:
acquiring a three-dimensional flow field structure in the turbine and the action frequency of each vortex system;
selecting a sweep frequency type ejector meeting the conditions according to the three-dimensional flow characteristics of the high-performance turbine; and
and establishing the correlation between the structural frequency of the vortex system in the blade cascade and the frequency of the sweep-frequency ejector, and analyzing the action rule and the action mechanism of the unsteady jet flow on the leakage vortex and the channel vortex in the turbine blade cascade to send a control command.
2. The method according to claim 1, characterized in that the conditions met are that the size, the sweep frequency and the injection position all meet corresponding preset conditions.
3. The method of claim 1, further comprising:
the swept frequency ejectors are arranged at different locations of the tip case such that different swept frequency jet locations control leakage fluid in different areas within the tip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010439258.7A CN111691929A (en) | 2020-05-22 | 2020-05-22 | Turbine blade top active flow control method based on sweep frequency type ejector |
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| CN202010439258.7A CN111691929A (en) | 2020-05-22 | 2020-05-22 | Turbine blade top active flow control method based on sweep frequency type ejector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112179671A (en) * | 2020-09-30 | 2021-01-05 | 中国科学院工程热物理研究所 | Low-pressure turbine annular cascade test bed with unsteady wake simulation function |
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Application publication date: 20200922 |