CN110159364A - A kind of adjustable guide vane executing agency applied to gas turbine - Google Patents
A kind of adjustable guide vane executing agency applied to gas turbine Download PDFInfo
- Publication number
- CN110159364A CN110159364A CN201910451676.5A CN201910451676A CN110159364A CN 110159364 A CN110159364 A CN 110159364A CN 201910451676 A CN201910451676 A CN 201910451676A CN 110159364 A CN110159364 A CN 110159364A
- Authority
- CN
- China
- Prior art keywords
- guide vane
- adjustable guide
- connecting rod
- cylinder body
- outer cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
- F01D17/20—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted
- F01D17/22—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical
- F01D17/26—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical fluid, e.g. hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/16—Control of working fluid flow
- F02C9/20—Control of working fluid flow by throttling; by adjusting vanes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0246—Surge control by varying geometry within the pumps, e.g. by adjusting vanes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluid Mechanics (AREA)
- Geometry (AREA)
- Control Of Turbines (AREA)
Abstract
A kind of adjustable guide vane executing agency applied to gas turbine, belongs to technical field of gas turbine.The present invention is low for the adjustable guide vane aperture regulation precision for solving gas turbine, the low problem of adjustment structure reliability.The present invention includes hydraulic cylinder, piston rod, torus, outer cylinder body, rocking bar, glide steering bar and adjustable guide vane；Outer cylinder body is consolidated in ground, and the cross section of outer cylinder body processes to form dovetail groove, and torus can slide in dovetail groove；Hydraulic cylinder is fixed on the top side wall of outer cylinder body, and one end of first connecting rod and piston rod are hinged, and the other end and second connecting rod of first connecting rod are hinged, and the other end and torus of second connecting rod are hinged；One end of rocking bar and the outer wall of torus are hinged, and the other end and glide steering bar of rocking bar are hinged, and sliding slot is equipped on the inside of the upper end of adjustable guide vane, and glide steering bar is mounted in the sliding slot of adjustable guide vane using sliding pair, and adjustable guide vane is movably arranged on outer cylinder body.The configuration of the present invention is simple, easy to assembly, high safety and reliability.
Description
Technical field
The present invention relates to a kind of gas turbine adjustable guide vane aperture regulation executing agencies, belong to technical field of gas turbine.
Background technique
The generation of surge phenomenon and the flow shedding of compressor flow passage component are closely related.Compressor is run in design conditions
When, air-flow enters the angle of attack of work leaf grating close to zero.When compressor deviates design conditions operation, it necessarily will appear air-flow
High incidence or the negative angle of attack.When the angle of attack increases to a certain extent, air-flow will separate to form flow shedding phenomenon with blade face.Work as sky
Air space flow be more than design discharge when, the negative angle of attack will be generated, when the angle of attack increase to a certain extent when, blade face will
Flow shedding phenomenon occurs.But since air-flow is flowed in concave side of blade, under inertia force effect, flow shedding area can be towards leaf
Piece intrados direction is squeezed and close, to prevent the further development of abscission zone.But when the air for flowing through work leaf grating holds
When product flow reduces, situation is just completely opposite, when volumetric air flow rates are less than design discharge, will generate high incidence, works as punching
When angle is increased to a certain extent, flow shedding phenomenon will occur in blade convexity face.Since air-flow is flowed in convex side of blade,
Under inertia force effect, there are a kind of propensities for making air-flow leave blade convexity face and separating.Make flow shedding area
It continues to develop and expands, the final strong pulsation for generating air-flow forms surge phenomenon.
Currently, in the operation of Gas Turbine Combined-cycle, by the adjusting to adjustable guide vane aperture, it can be achieved that combustion gas
The adjusting of turbine exhaust temperature, so realize variable working condition when waste heat boiler temperature requirement, thus improve combined cycle unit change
Operating condition it is economical.
And during uniaxial combined cycle, by the requirement to adjustable guide vane aperture, it can be achieved that delivery temperature and steam
The matching requirement of turbine, currently, the transmission executing agency structure for being applied to gas turbine adjustable guide vane is single, adjustable guide vane turns
It is low that angle controls precision, and in large-scale adjustable guide vane aperture regulation process, existing reliability control system is low, and processing cost is high,
Assemble the technical problems such as inconvenience.Cause surge preventing system that cannot be not easy to meet the service requirement of unit.
Summary of the invention
The present invention is low for the adjustable guide vane aperture regulation precision for solving gas turbine, and adjustment structure reliability is low to ask
Topic, and then provide a kind of adjustable guide vane executing agency applied to gas turbine.It has been given below about of the invention
Brief overview, in order to provide a basic understanding of certain aspects of the invention.It should be appreciated that this general introduction is not about this
The exhaustive general introduction of invention.It is not intended to determine key or pith of the invention, nor intended limitation is of the invention
Range.
Technical solution of the present invention:
A kind of adjustable guide vane executing agency applied to gas turbine, including hydraulic cylinder, piston rod, first connecting rod, second
Connecting rod, torus, outer cylinder body, rocking bar, glide steering bar and adjustable guide vane；
The outer cylinder body is consolidated in ground, and sliding pair, outer cylinder body are equipped at the cooperation of the torus and outer cylinder body
Cross section process to form dovetail groove, torus can slide in dovetail groove；
The hydraulic cylinder is fixed on the top side wall of outer cylinder body, one end of the first connecting rod and the work of hydraulic cylinder
Stopper rod is articulated with point A, and the other end of first connecting rod and one end of second connecting rod are articulated with point B, the other end and circle of second connecting rod
Ring body is articulated with point C；
One end of the rocking bar and the outer wall of torus are articulated with point D, and the other end and glide steering bar of rocking bar are hinged
Sliding slot is equipped on the inside of point E, the upper end of the adjustable guide vane, glide steering bar is mounted on the cunning of adjustable guide vane using sliding pair
In slot, the adjustable guide vane is movably arranged on outer cylinder body.
Preferred: the center of the outer cylinder body is point O, and hydraulic cylinder 1 is mounted on the positive upper end of outer cylinder body, hydraulic cylinder and outer shell
The line of body central point O is perpendicular to hinge joint C and the outer cylinder body line of centres, and under original state, piston rod and second connecting rod are at hanging down
0 ° of relationship of Helicopter-9.
Preferred: the cross section that sliding slot is equipped on the inside of the upper end of the adjustable guide vane is rectangle, the glide steering
The cross section of bar is rectangle, and the sliding slot being equipped on the inside of the size of glide steering bar and adjustable guide vane upper end matches.
Preferred: the angle in the piston rod and first connecting rod transmission process is 120~150 °, and described first connects
Angle in bar and second connecting rod transmission process is 120~150 °.
Preferred: the angle in the piston rod and first connecting rod transmission process is 135 °, the first connecting rod with
Angle in second connecting rod transmission process is 135 °.
Preferred: one end of the rocking bar and the outer wall of torus are articulated with point D, and articulated manner uses ball-joint.
Preferred: the end face angle in the rocking bar and outer cylinder body transmission process is 85~90 °.
The present invention has the effect that compared with prior art
Control torus can be realized around cylinder center using the labyrinth of connecting lever 1. the present invention overcomes the prior arts
Rotation, and by oat tail groove structure design, in the way of the face contact that dovetail groove has, torus contacted with cylinder body carry compared with
Greatly, it is more stable that precision is used for a long time, sliding is more steady reliable；
2. piston rod of the invention and second connecting rod shape transmission angle in 90 °, this level for making hydraulic cylinder piston rod
It is mobile to be converted directly into the torus power maximum journey that piston rod is driven in the rotational action of cylinder center O point, whole process
Degree directly acts on second connecting rod, and this mode can utmostly save hydraulic cylinder workmanship, reduce entire aperture regulation machine
Structure duty requirements；
3. adjustable guide vane is constrained by outer cylinder body in the present invention, allows it to retain and only have rotary freedom, driven by rocking bar
Large rotation of the glide steering bar around central axis and the small range vertical motion along adjustable guide vane internal chute, drive can
The rotation of transduction leaf, to be finally reached the corner range demands of control adjustable guide vane.
Detailed description of the invention
Fig. 1 is a kind of main view of adjustable guide vane executing agency applied to gas turbine；
Fig. 2 is the cross-sectional view in Fig. 1 at M-M；
Fig. 3 is that outer cylinder body and rocking bar are coupled relational graph；
Fig. 4 is the side view of adjustable guide vane executing agency；
Fig. 5 is cross-sectional view at N-N in Fig. 4；
Wherein: 1- hydraulic cylinder, 2- piston rod, 3- first connecting rod, 4- second connecting rod, 5- torus, 6- outer cylinder body, 7- shake
Bar, 8- glide steering bar, 9- adjustable guide vane.
Specific embodiment
Specific embodiment 1: illustrating that present embodiment, one kind of present embodiment are applied to combustion gas wheel in conjunction with Fig. 1-Fig. 5
The adjustable guide vane executing agency of machine, including hydraulic cylinder 1, piston rod 2, first connecting rod 3, second connecting rod 4, torus 5, outer cylinder body 6,
Rocking bar 7, glide steering bar 8 and adjustable guide vane 9；
The outer cylinder body 6 is consolidated in ground, and sliding pair, outer shell are equipped at the cooperation of the torus 5 and outer cylinder body 6
The cross section of body 6 processes to form dovetail groove, and torus 5 can slide in dovetail groove；
The hydraulic cylinder 1 is fixed on the top side wall of outer cylinder body 6, one end of the first connecting rod 3 and hydraulic cylinder 1
Piston rod 2 be articulated with point A, the other end of first connecting rod 3 and one end of second connecting rod 4 are articulated with point B, second connecting rod 4 it is another
One end and torus 5 are articulated with point C；
One end of the rocking bar 7 and the outer wall of torus 5 are articulated with point D, the other end and glide steering bar 8 of rocking bar 7
It is articulated with point E, sliding slot is equipped on the inside of the upper end of the adjustable guide vane 9, glide steering bar 8 is mounted on transducible using sliding pair
In the sliding slot of leaf 9, the adjustable guide vane 9 is movably arranged on outer cylinder body 6.
In gas turbine adjustable guide vane adjustment process, the piston rod 2 in control system control hydraulic cylinder 1 is moved horizontally, living
Stopper rod 2 controls first connecting rod mobile 3, and first connecting rod 3 controls second connecting rod 4 and swings, and second connecting rod 4 controls torus 5 along outer
The dovetail groove of cylinder body 6 is rotated around point O, i.e., is moved horizontally by piston rod in control hydraulic cylinder, by transmission chain, be converted to
The rotation around point O of torus；
5 external circumferential of torus and 7 flexural pivot of rocking bar are connected to point D, and 7 other side of rocking bar and glide steering bar 8 are hingedly and point
Sliding slot is equipped on the inside of E, glide steering bar 8 and 9 upper end of adjustable guide vane, i.e. sliding is secondary, and section is rectangle；
Adjustable guide vane 9 is constrained by outer cylinder body, allows it to retain and only has rotary freedom, drives glide steering by rocking bar 7
Large rotation of the bar 8 around central axis and the small range vertical motion along 9 internal chute of adjustable guide vane drive adjustable guide vane
9 rotation, to be finally reached the corner range demands of control adjustable guide vane.
Specific embodiment 2: illustrating that present embodiment, one kind of present embodiment are applied to combustion gas wheel in conjunction with Fig. 1-Fig. 5
The center of the adjustable guide vane executing agency of machine, the outer cylinder body 6 is point O, and hydraulic cylinder 1 is mounted on the positive upper end of outer cylinder body, hydraulic
The line of cylinder 1 and 6 central point O of outer cylinder body are perpendicular to hinge joint C and 6 line of centres of outer cylinder body, under original state, piston rod 2 and
The perpendicular relationship of second connecting rod 4.So set, the piston rod 2 of the executing agency and the perpendicular relationship of second connecting rod 4, instead of
Right angle connecting lever, and can satisfy by this installation relation the best folding angle of adjustable guide vane to the adjusting of adjustable guide vane aperture
Degree, and then realize the adjusting to combustion turbine exhaustion temperature, the temperature requirement of waste heat boiler when realizing variable working condition solves combustion gas wheel
Machine surge phenomenon improves the economical of combined cycle unit variable working condition
Specific embodiment 3: illustrating that present embodiment, one kind of present embodiment are applied to combustion gas wheel in conjunction with Fig. 1-Fig. 5
The adjustable guide vane executing agency of machine, the cross section that the upper end inside of the adjustable guide vane 9 is equipped with sliding slot is rectangle, the cunning
The cross section for moving turning-bar 8 is rectangle, and the sliding slot being equipped on the inside of the size of glide steering bar 8 and 9 upper end of adjustable guide vane matches.
So set, adjustable guide vane 9 is constrained by outer cylinder body 6, allow it to retain and only have rotary freedom, drives sliding to turn by rocking bar 7
To bar 8 around the large rotation of central axis and along the small range vertical motion of 9 internal chute of adjustable guide vane, drive transducible
The rotation of leaf 9, to be finally reached the corner range demands of control adjustable guide vane.
Specific embodiment 4: illustrating that present embodiment, one kind of present embodiment are applied to combustion gas wheel in conjunction with Fig. 1-Fig. 5
Angle in the adjustable guide vane executing agency of machine, the piston rod 2 and 3 transmission process of first connecting rod is 120~150 °, described
First connecting rod 3 and 4 transmission process of second connecting rod in angle be 120~150 °.
Specific embodiment 5: illustrating that present embodiment, one kind of present embodiment are applied to combustion gas wheel in conjunction with Fig. 1-Fig. 5
The adjustable guide vane executing agency of machine, the angle in the piston rod 2 and 3 transmission process of first connecting rod is 135 °, described the
One connecting rod 3 and the angle in 4 transmission process of second connecting rod are 135 °.So set, effect of the piston rod 2 by the power of horizontal direction
Under, piston rod 2 drives first connecting rod 3 mobile, and piston rod 2 acts on the resultant force on first connecting rod 3 and connects exactly along first at this time
The direction of bar 3, and when the control swing of second connecting rod 4 of first connecting rod 3, the power acted on first connecting rod 3 realizes that control second connects
Bar 4 is swung, and the loss of power is obviously reduced compared with the prior art using modes such as connecting levers in entire control process, and piston rod 2 and the
When angle in one connecting rod 3, first connecting rod 3 and 4 transmission process of second connecting rod is 135 °, the opposite outer cylinder body of entire torus 5
Sliding force is more uniform, therefore puts forward piston rod 2 in the present embodiment with the angle in 3 transmission process of first connecting rod and be
135 °, first connecting rod 3 and the angle in 4 transmission process of second connecting rod are 135 ° to be the technical program are realizing that gas turbine can turn
The preferred plan that guide vane opening is adjusted is adjusted by the angle range that the design of this structure can accurately control adjustable guide vane.
Specific embodiment 6: illustrating that present embodiment, one kind of present embodiment are applied to combustion gas wheel in conjunction with Fig. 1-Fig. 5
The adjustable guide vane executing agency of machine, one end of the rocking bar 7 and the outer wall of torus 5 are articulated with point D, and articulated manner uses ball
Hingedly.
Specific embodiment 7: illustrating that present embodiment, one kind of present embodiment are applied to combustion gas wheel in conjunction with Fig. 1-Fig. 5
End face angle in the adjustable guide vane executing agency of machine, the rocking bar 7 and 6 transmission process of outer cylinder body is 85~90 °.
A kind of adjustable guide vane executing agency applied to gas turbine of the invention can design different numbers according to the actual situation
The adjustable guide vane of amount, and then corresponding number of rocking bar is designed, corresponding number of rocking bar and torus are circumferentially equal
Flexural pivot connection is set evenly.
A kind of adjustable guide vane executing agency applied to gas turbine of the invention can extremely be accurately controlled position precision
Design objective, be based on design requirement, by control transmission mechanism size, can it is large range of and accurately can control can
The angle range of transduction leaf；Furthermore this mechanism structure is simple, and processing cost is low, easy to assembly, high safety and reliability.
This embodiment is just an exemplary description of this patent, does not limit its protection scope, those skilled in the art
Member can also be changed its part, as long as it does not exceed the essence of this patent, within the protection scope of the present patent.
Claims (7)
1. a kind of adjustable guide vane executing agency applied to gas turbine, including hydraulic cylinder (1), piston rod (2), first connecting rod
(3), second connecting rod (4), torus (5), outer cylinder body (6), rocking bar (7), glide steering bar (8) and adjustable guide vane (9), feature
Be: the outer cylinder body (6) is consolidated in ground, and sliding pair is equipped at the cooperation of the torus (5) and outer cylinder body (6),
The cross section of outer cylinder body (6) processes to form dovetail groove, and torus (5) can slide in dovetail groove；
The hydraulic cylinder (1) is fixed on the top side wall of outer cylinder body (6), one end of the first connecting rod (3) with it is hydraulic
The piston rod (2) of cylinder (1) is articulated with point A, and the other end of first connecting rod (3) and the one end of second connecting rod (4) are articulated with point B, the
The other end of two connecting rods (4) and torus (5) are articulated with point C；
One end of the rocking bar (7) and the outer wall of torus (5) are articulated with point D, the other end and glide steering bar of rocking bar (7)
(8) it is articulated with point E, sliding slot is equipped on the inside of the upper end of the adjustable guide vane (9), glide steering bar (8) is using the secondary installation of sliding
In the sliding slot of adjustable guide vane (9), the adjustable guide vane (9) is movably arranged on outer cylinder body (6).
2. a kind of adjustable guide vane executing agency applied to gas turbine according to claim 1, it is characterised in that: described
The center of outer cylinder body (6) be point O, hydraulic cylinder (1) is mounted on the positive upper end of outer cylinder body, hydraulic cylinder (1) and outer cylinder body (6) central point
The line of O is perpendicular to hinge joint C and outer cylinder body (6) line of centres, and under original state, piston rod (2) and second connecting rod (4) are in hanging down
Straight relationship.
3. a kind of adjustable guide vane executing agency applied to gas turbine according to claim 1, it is characterised in that: described
Adjustable guide vane (9) upper end on the inside of to be equipped with the cross section of sliding slot be rectangle, the cross section of the glide steering bar (8) is square
The sliding slot that shape, the size of glide steering bar (8) and adjustable guide vane (9) upper end inside are equipped with matches.
4. a kind of adjustable guide vane executing agency applied to gas turbine according to claim 1, it is characterised in that: described
Piston rod (2) and first connecting rod (3) transmission process in angle be 120~150 °, the first connecting rod (3) with second connect
Angle in bar (4) transmission process is 120~150 °.
5. a kind of adjustable guide vane executing agency applied to gas turbine according to claim 4, it is characterised in that: described
Piston rod (2) and first connecting rod (3) transmission process in angle be 135 °, the first connecting rod (3) and second connecting rod (4)
Angle in transmission process is 135 °.
6. a kind of adjustable guide vane executing agency applied to gas turbine according to claim 1, it is characterised in that: described
One end of rocking bar (7) and the outer wall of torus (5) be articulated with point D, articulated manner uses ball-joint.
7. a kind of adjustable guide vane executing agency applied to gas turbine according to claim 1, it is characterised in that: described
Rocking bar (7) and outer cylinder body (6) transmission process in end face angle be 85~90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910451676.5A CN110159364A (en) | 2019-05-28 | 2019-05-28 | A kind of adjustable guide vane executing agency applied to gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910451676.5A CN110159364A (en) | 2019-05-28 | 2019-05-28 | A kind of adjustable guide vane executing agency applied to gas turbine |
Publications (1)
| Publication Number | Publication Date |
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| CN110159364A true CN110159364A (en) | 2019-08-23 |
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ID=67629669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910451676.5A Pending CN110159364A (en) | 2019-05-28 | 2019-05-28 | A kind of adjustable guide vane executing agency applied to gas turbine |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3383090A (en) * | 1966-12-30 | 1968-05-14 | Ford Motor Co | Fluid pressure control for a turbine nozzle actuator |
| US3574479A (en) * | 1968-09-17 | 1971-04-13 | Leyland Gas Turbines Ltd | Turbine having variable-angle nozzle guide vanes |
| US4003675A (en) * | 1975-09-02 | 1977-01-18 | Caterpillar Tractor Co. | Actuating mechanism for gas turbine engine nozzles |
| JPS6128720A (en) * | 1984-07-20 | 1986-02-08 | Nissan Motor Co Ltd | Variable nozzle control device for turbocharger |
| US4955788A (en) * | 1988-05-16 | 1990-09-11 | Mitsubishi Jukogyo Kabushiki Kaisha | Driving linkage device |
| US6179469B1 (en) * | 1998-05-22 | 2001-01-30 | Mitsubishi Heavy Industries, Ltd. | Rotation mechanism for rotating a ring |
| CN108825546A (en) * | 2018-08-30 | 2018-11-16 | 哈尔滨电气股份有限公司 | It is a kind of applied to the adjustable guide vane executing agency of gas turbine and its drive method |
-
2019
- 2019-05-28 CN CN201910451676.5A patent/CN110159364A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3383090A (en) * | 1966-12-30 | 1968-05-14 | Ford Motor Co | Fluid pressure control for a turbine nozzle actuator |
| US3574479A (en) * | 1968-09-17 | 1971-04-13 | Leyland Gas Turbines Ltd | Turbine having variable-angle nozzle guide vanes |
| US4003675A (en) * | 1975-09-02 | 1977-01-18 | Caterpillar Tractor Co. | Actuating mechanism for gas turbine engine nozzles |
| JPS6128720A (en) * | 1984-07-20 | 1986-02-08 | Nissan Motor Co Ltd | Variable nozzle control device for turbocharger |
| US4955788A (en) * | 1988-05-16 | 1990-09-11 | Mitsubishi Jukogyo Kabushiki Kaisha | Driving linkage device |
| US6179469B1 (en) * | 1998-05-22 | 2001-01-30 | Mitsubishi Heavy Industries, Ltd. | Rotation mechanism for rotating a ring |
| CN108825546A (en) * | 2018-08-30 | 2018-11-16 | 哈尔滨电气股份有限公司 | It is a kind of applied to the adjustable guide vane executing agency of gas turbine and its drive method |
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Application publication date: 20190823 |