Gas turbine double-duct air inlet switching mechanism test bed, method, program and storage medium

Abstract

The invention belongs to the technical field of semi-physical tests, and particularly relates to a gas turbine double-duct air inlet switching mechanism test bed, a method, a program and a storage medium. The device can simulate the flow distribution condition of the inner duct and the outer duct in the switching process of the reversing turbine of the reversing gas turbine, and can be used for a steady-state flow characteristic test of independent operation of double ducts of the gas turbine and a dynamic flow test of an electric cylinder in different operation modes. Flow distribution characteristic research of double ducts of the gas turbine under multiple working conditions and aerodynamic characteristic research in different electric cylinder operation modes can be achieved, and a series of complex problems caused by coupling of a reversing turbine and a switching mechanism of the gas turbine are solved. And a theoretical basis and technical support are provided for the overall performance analysis of the gas turbine capable of reversing.

Description

Technical Field

[0001] The present invention belongs to the technical field of semi-physical testing, and in particular relates to a test bench, method, program and storage medium for a dual-duct intake switching mechanism of a gas turbine. Background Art

[0002] Marine gas turbines are widely used because of their advantages such as high power, small size, light weight and low pollution. However, since they cannot complete the reversing operation alone, they must rely on equipment such as controllable pitch propellers (CPPs) and reversing transmission devices to achieve reversing operations, which limits the operating capacity of the gas turbine and the maneuverability of the ship, and directly affects the safety and efficiency of the ship. At present, most ships use controllable pitch propellers, reversing gearboxes and electric transmission devices for reversing operations. Although reversing operations are achieved, the maneuverability of the ship is limited to a certain extent. The switching mechanism of the controllable pitch propeller is installed in the hub of the propeller, and the diameter of the propeller hub is large, resulting in a 0.5% to 1% decrease in efficiency. It takes one minute to go from full speed forward to full speed reverse. The reversing gearbox and electric transmission device are not only difficult to achieve at high power, but also take five minutes or even longer to go from full speed forward to full speed reverse. In view of this, scholars have developed a direct reversing gas turbine based on the gas turbine body. This gas turbine, like a diesel engine, has the ability to rotate forward and reverse independently. It can complete full-speed forward, full-speed reverse and propeller stop operations without the aid of other devices. By changing the ship's control strategy, it can effectively improve the ship's maneuverability and greatly enhance the ship's emergency avoidance capabilities.

[0003] Direct reversible gas turbines are divided into two types: blocking type and flow isolation type. The blocking type has an increased overall size and weight compared to the flow isolation type. Based on this situation, the structure of the flow isolation type reversible gas turbine is selected. Compared with the conventional gas turbine, the main difference is that the power turbine of the reversible gas turbine is a double-layer duct structure with inner and outer ducts. The inner duct turbine blades are called forward turbine blades, which realize the forward operation of the gas turbine; the outer duct turbine blades are called reverse turbine blades, which realize the reverse operation of the gas turbine. At present, the reversible technology mainly focuses on gas dynamics and reverse turbine blade structure, and remains at the theoretical level, ignoring the coupling characteristics between the reversible turbine double duct switching mechanism and the gas engine. The performance of the reversible turbine double duct switching mechanism is crucial to the switching performance of the gas engine. Summary of the invention

[0004] The object of the present invention is to provide a gas turbine dual-duct intake switching mechanism test bench, method, program and storage medium, which can simulate the flow distribution and change trend of the inner and outer ducts of a reversible gas turbine during the switching process of variable operating conditions, as well as the maneuverability of the switching mechanism under different operating modes, so as to better analyze the influence of the reversible turbine dual-duct structure on the overall performance of the marine gas turbine.

[0005] A gas turbine dual-duct intake switching mechanism test bench comprises a frequency conversion controller, a frequency conversion motor, a centrifugal air source fan, a switching mechanism, an outer duct flow pipe and an inner duct flow pipe; the frequency conversion controller is used to control the frequency conversion motor, and the frequency conversion motor is used to drive the centrifugal air source fan; the switching mechanism comprises a second servo controller, a second drive motor, a ball screw electric cylinder, an electric push rod, a switching baffle and a switching channel; the switching baffle is arranged in the switching channel, the inlet of the switching channel is connected to the output end of the centrifugal air source fan, the outlet of the switching channel is connected to the outer duct flow pipe and the inner duct flow pipe respectively through a shunt pipe, a section is selected from the outer duct flow pipe and the inner duct flow pipe respectively as a flow measurement pipe, and the flow measurement pipe is equipped with a vortex flowmeter; the second servo controller is used to control the second drive motor, the second drive motor is used to drive the ball screw electric cylinder to move left and right along a straight line, the ball screw electric cylinder is connected to the electric push rod, and the electric push rod is connected to the switching baffle; the ball screw electric cylinder is equipped with a displacement sensor, and the electric push rod is equipped with a torque sensor.

[0006] Furthermore, the electric push rod is used to drive the switching baffle to rotate; when the switching baffle is on the outer duct side, the inner duct flow pipe is closed, at this time, the gas state of the gas turbine reversing turbine forward operation is simulated; when the switching baffle is on the inner duct side, the outer duct flow pipe is closed, at this time, the gas state of the gas turbine reversing turbine reverse operation is simulated; when the switching baffle is between the two sides, the gas turbine reversing turbine is simulated. The gas switching state between the inner and outer ducts.

[0007] Furthermore, the output end of the centrifugal air source fan is connected to the inlet of the switching channel through an air intake contraction section and a diameter reducing section.

[0008] Furthermore, it also includes a load subsystem, which includes a first servo controller, a first drive motor, a torque meter and an eddy current dynamometer; the first servo controller is used to control the first drive motor, the first drive motor is used to drive the eddy current dynamometer, and the torque meter is used to collect the torque when the eddy current dynamometer is working.

[0009] Furthermore, it also includes a measurement and control system, which includes a gas turbine real-time simulation system and a lower computer; the gas turbine real-time simulation system includes a first host computer and a second host computer; the first host computer is used for monitoring, controlling and alarming the simulation process and storing and displaying simulation data; the second host computer is used to control the gas turbine real-time simulation model; the lower computer includes a PLC measurement and control system, which is used to control the frequency conversion controller and the first servo controller.

[0010] A test method based on a gas turbine dual-duct intake switching mechanism test bench, wherein a first host computer sends initial load condition information and electric push rod status information to a second host computer; the second host computer calculates a control signal according to a real-time simulation model of the gas turbine and transmits the control signal to a lower computer through a data transmission network; a PLC measurement and control system in the lower computer calculates a speed setting value and inputs the speed setting value into a frequency conversion controller and a first servo controller respectively; the frequency conversion controller controls a frequency conversion motor to drive a centrifugal air source fan to work, and the first servo controller controls a first drive motor to drive an eddy current dynamometer to work; the switching mechanism does not work and maintains an initial state, that is, a switching baffle is on the outer duct side, and an inner duct flow pipe is closed; the torque, speed of the eddy current dynamometer and the flow data of the outer duct flow pipe are fed back to the second host computer through the data transmission network, and the gas turbine dual-duct intake switching mechanism test bench is operated in a forward mode.

[0011] Furthermore, the method of switching from the forward working mode to the reverse working mode is also included, which is specifically:

[0012] The first host computer sends a gas turbine load reduction operating condition switching instruction to the second host computer; the second host computer calculates a control signal based on a real-time simulation model of the gas turbine and transmits it to the lower computer through a data transmission network; the PLC measurement and control system in the lower computer calculates a speed setting value and inputs it into the frequency conversion controller and the first servo controller respectively; the frequency conversion controller reduces the speed of the centrifugal air source fan by controlling the frequency conversion motor, and the first servo controller reduces the speed of the eddy current dynamometer by the first drive motor, and the other parts of the gas turbine dual duct intake switching mechanism test bench remain unchanged;

[0013] After the gas turbine dual-duct intake switching mechanism test bench is operating stably under reduced operating conditions, the first host computer directly sends a control instruction to the switching mechanism, the switching mechanism starts working, the second servo controller controls the electric push rod to work through the second drive motor, the switching baffle is switched from the outer duct side to the inner duct side, and the displacement and force data of the electric push rod are fed back to the first host computer; the first host computer feeds back the displacement and force data of the electric push rod to the second host computer, and the second host computer feeds back the speed signal to the lower computer through the data transmission network in real time according to the change of the load speed of the gas turbine real-time simulation model from positive to negative, the PLC measurement and control system of the lower computer calculates the speed setting value and inputs it to the first servo controller, the first servo controller switches the eddy current dynamometer from forward to reverse operation through the first drive motor, and the centrifugal air source fan remains unchanged. The current gas turbine dual-duct intake switching mechanism test bench is in the intermediate switching working mode;

[0014] When the switching damper is on the inner duct side, the outer duct flow pipe is closed, the switching mechanism stops running, and the current gas turbine dual duct intake switching mechanism test bench is running in the reverse working mode.

[0015] A computer device / equipment / system comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above-mentioned test method based on a gas turbine dual-duct intake switching mechanism test bench.

[0016] A computer-readable storage medium stores a computer program / instruction thereon, which, when executed by a processor, implements the steps of the above-mentioned test method based on a gas turbine dual-duct intake switching mechanism test bench.

[0017] A computer program product includes a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned test method based on a gas turbine dual-duct intake switching mechanism test bench.

[0018] The beneficial effects of the present invention are:

[0019] The present invention can simulate the flow distribution of the inner and outer ducts during the switching process of the reversible turbine of a reversible gas turbine, and can be used for the steady-state flow characteristic test of the dual duct of the gas turbine operating alone and the dynamic flow test under different operating modes of the electric cylinder. It can realize the flow distribution characteristic study of the dual duct of the gas turbine under multiple working conditions and the aerodynamic characteristic study under different electric cylinder operating modes, solve a series of complex problems caused by the coupling of the reversible turbine of the gas turbine and the switching mechanism, and provide a theoretical basis and technical support for the overall performance analysis of the reversible gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1The figure is a schematic diagram of a gas turbine dual-duct intake switching mechanism test bench in the present invention.

[0021] Figure 2 The overall framework diagram of the test method of the dual-duct air intake switching mechanism of the gas turbine in the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings.

[0023] See also Figure 1 A gas turbine double-duct intake switching mechanism test bench includes a centrifugal air source fan 1, an intake contraction section 2, a reducing section 3, an inlet flange 4, a torque sensor 5, a second drive motor 6, a second servo controller, a ball screw electric cylinder 7, an electric push rod 15, an outlet flange 14, a diversion pipe 9, an outer duct flow pipe 10a, an inner duct flow pipe 10b, an outer duct flow measurement pipe 11a, an inner duct flow measurement pipe 11b, support plates 12a and 12b, a matching electrical cabinet 13, a primary linkage rod 8, a load subsystem and a measurement and control system.

[0024] The frequency conversion controller is used to control the frequency conversion motor, and the frequency conversion motor is used to drive the centrifugal air source fan 1; the switching mechanism includes a second servo controller, a second drive motor 6, a ball screw electric cylinder 7, an electric push rod 15, a switching baffle and a switching channel; the switching baffle is arranged in the switching channel, the output end of the centrifugal air source fan 1 is connected to the inlet of the switching channel through the air intake contraction section 2 and the reducing section 3, and the outlet of the switching channel is respectively connected to the outer duct flow pipe 10a and the inner duct flow pipe 10b through the diversion pipe 9, and a section is selected from the outer duct flow pipe 10a and the inner duct flow pipe 10b as a flow measurement pipe, and the flow measurement pipe is equipped with a vortex flowmeter; the second servo controller is used to control the second drive motor 6, and the second drive motor 6 is used to drive the ball screw electric cylinder 7 to move left and right along a straight line, the ball screw electric cylinder 7 is connected to the electric push rod 15, and the electric push rod 15 is connected to the switching baffle; the ball screw electric cylinder 7 is equipped with a displacement sensor, and the electric push rod 15 is equipped with a torque sensor 5.

[0025] The electric push rod 15 is used to drive the switching baffle to rotate; when the switching baffle is on the outer duct side, the inner duct flow pipe 10b is closed, at this time simulating the gas state of the gas turbine reversing turbine forward operation; when the switching baffle is on the inner duct side, the outer duct flow pipe 10a is closed, at this time simulating the gas state of the gas turbine reversing turbine reverse operation; when the switching baffle is between the two sides, it simulates the gas turbine reversing turbine gas switching state between the inner and outer ducts.

[0026] The load subsystem includes a first servo controller, a first drive motor, a torque meter and an eddy current dynamometer; the first servo controller is used to control the first drive motor, the first drive motor is used to drive the eddy current dynamometer, and the torque meter is used to collect the torque when the eddy current dynamometer is working.

[0027] The measurement and control system includes a gas turbine real-time simulation system and a lower computer; the gas turbine real-time simulation system includes a first upper computer and a second upper computer; the first upper computer is used for monitoring, controlling and alarming the simulation process and storing and displaying simulation data; the second upper computer is used for controlling the gas turbine real-time simulation model; the lower computer includes a PLC measurement and control system, which is used to control the frequency conversion controller and the first servo controller.

[0028] like Figure 2 As shown, the test method based on the gas turbine double duct intake switching mechanism test bench includes the following contents;

[0029] The gas turbine dual-duct intake switching mechanism test bench is started. First, the first host computer sends the initial load condition information and the electric push rod status information to the second host computer; the second host computer calculates the control signal according to the gas turbine real-time simulation model and transmits it to the lower computer through the data transmission network; the PLC measurement and control system in the lower computer calculates the speed setting value and inputs it to the frequency conversion controller and the first servo controller respectively; the frequency conversion controller controls the frequency conversion motor to drive the centrifugal air source fan to work, and the first servo controller controls the first drive motor to drive the eddy current dynamometer to work; the switching mechanism does not work and maintains the initial state, that is, the switching baffle is on the outer duct side, and the inner duct flow pipe is closed; the torque, speed of the eddy current dynamometer and the flow data of the outer duct flow pipe are fed back to the second host computer through the data transmission network, the gas turbine real-time simulation model, the load subsystem and the switching mechanism subsystem operate stably, and the gas turbine dual-duct intake switching mechanism test bench operates in the forward mode.

[0030] When switching from forward working mode to reverse working mode:

[0031] The first host computer sends a gas turbine load reduction operating condition switching instruction to the second host computer; the second host computer calculates a control signal based on a real-time simulation model of the gas turbine and transmits it to the lower computer through a data transmission network; the PLC measurement and control system in the lower computer calculates a speed setting value and inputs it into the frequency conversion controller and the first servo controller respectively; the frequency conversion controller reduces the speed of the centrifugal air source fan by controlling the frequency conversion motor, and the first servo controller reduces the speed of the eddy current dynamometer by the first drive motor, and the other parts of the gas turbine dual duct intake switching mechanism test bench remain unchanged;

[0032] After the gas turbine dual-duct intake switching mechanism test bench is operating stably under reduced operating conditions, the first host computer directly sends a control instruction to the switching mechanism, the switching mechanism starts working, the second servo controller controls the electric push rod to work through the second drive motor, the switching baffle is switched from the outer duct side to the inner duct side, and the displacement and force data of the electric push rod are fed back to the first host computer; the first host computer feeds back the displacement and force data of the electric push rod to the second host computer, and the second host computer feeds back the speed signal to the lower computer through the data transmission network in real time according to the change of the load speed of the gas turbine real-time simulation model from positive to negative, the PLC measurement and control system of the lower computer calculates the speed setting value and inputs it to the first servo controller, the first servo controller switches the eddy current dynamometer from forward to reverse operation through the first drive motor, and the centrifugal air source fan remains unchanged. The current gas turbine dual-duct intake switching mechanism test bench is in the intermediate switching working mode;

[0033] When the switching damper is on the inner duct side, the outer duct flow pipe is closed, the switching mechanism stops running, and the current gas turbine dual duct intake switching mechanism test bench is running in the reverse working mode.

[0034] The operating data of the gas turbine real-time simulation model, load subsystem and switching mechanism subsystem are recorded, and the working characteristics of the reversible gas turbine are analyzed and verified.

[0035] The data of important parameters of the semi-physical test system are transmitted to the first host computer through the data interface for display, storage and real-time simulation model of the gas turbine, including the combustion chamber outlet temperature, high-pressure shaft speed, low-pressure shaft speed, power turbine speed, power turbine output torque, low-pressure turbine exhaust temperature, high and low pressure compressor output pressure and high and low pressure turbine output pressure and other parameters. The first host computer controls the working condition of the reversible semi-physical test system through the data interface. Based on the full load power, the first host computer sends a forward working condition instruction to realize the forward operation of the reversible gas turbine (simulating the forward operation of the marine gas turbine), sends a forward lowering working condition instruction to realize the forward deceleration operation of the reversible gas turbine; sends an electric push rod control instruction to realize the switching of the reversible gas turbine from forward to reverse or reverse to forward (simulating the switching of the marine gas turbine from forward to backward); sends a reverse raising working condition instruction to realize the reverse acceleration operation of the reversible gas turbine.

[0036] The gas turbine dual-duct air intake switching mechanism test bench provided by the present invention can simulate the flow distribution of the inner and outer ducts during the switching process of the reversible turbine of the reversible gas turbine, and can be used for the steady-state flow characteristic test of the gas turbine dual-duct operating alone and the dynamic flow test under different operating modes of the electric cylinder. It can realize the flow distribution characteristic study of the gas turbine dual-duct under multiple working conditions and the aerodynamic characteristic study under different electric cylinder operating modes, solve a series of complex problems caused by the coupling of the gas turbine reversible turbine and the switching mechanism, and provide a theoretical basis and technical support for the overall performance analysis of the reversible gas turbine.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas turbine dual duct intake switching mechanism test bench, characterized in that: The invention comprises a frequency conversion controller, a frequency conversion motor, a centrifugal air source fan (1), a switching mechanism, an outer duct flow pipe (10a) and an inner duct flow pipe (10b); the frequency conversion controller is used to control the frequency conversion motor, and the frequency conversion motor is used to drive the centrifugal air source fan (1); the switching mechanism comprises a second servo controller, a second drive motor (6), a ball screw type electric cylinder (7), an electric push rod (15), a switching baffle and a switching channel; the switching baffle is arranged in the switching channel, the inlet of the switching channel is connected to the output end of the centrifugal air source fan, and the outlet of the switching channel is connected to the outer duct flow pipe through a shunt pipe (9). The outer duct (10a) and the inner duct flow pipe (10b) are connected, a section is selected from each of the outer duct flow pipe (10a) and the inner duct flow pipe (10b) as a flow measurement pipe, and the flow measurement pipes are equipped with a vortex flowmeter; the second servo controller is used to control the second drive motor (6), the second drive motor (6) is used to drive the ball screw type electric cylinder (7) to move left and right along a straight line, the ball screw type electric cylinder (7) is connected to the electric push rod (15), and the electric push rod (15) is connected to the switching baffle; the ball screw type electric cylinder (7) is equipped with a displacement sensor, and the electric push rod (15) is equipped with a torque sensor (5).

2. A gas turbine dual duct intake switching mechanism test bench according to claim 1, characterized in that: The electric push rod (15) is used to drive the switching damper to rotate; when the switching damper is on the outer duct side, the inner duct flow pipe (10b) is closed, at this time simulating the gas state of the gas turbine reversing turbine in forward operation; when the switching damper is on the inner duct side, the outer duct flow pipe (10a) is closed, at this time simulating the gas state of the gas turbine reversing turbine in reverse operation; when the switching damper is between the two sides, it simulates the gas turbine reversing turbine in the inner and outer duct switching state.

3. A gas turbine dual duct intake switching mechanism test bench according to claim 1, characterized in that: The output end of the centrifugal air source fan (1) is connected to the inlet of the switching channel via an air intake contraction section (2) and a diameter reducing section (3).

4. A gas turbine dual duct intake switching mechanism test bench according to claim 1, characterized in that: It also includes a load subsystem, which includes a first servo controller, a first drive motor, a torque meter and an eddy current dynamometer; the first servo controller is used to control the first drive motor, the first drive motor is used to drive the eddy current dynamometer, and the torque meter is used to collect the torque of the eddy current dynamometer when it is working.

5. A gas turbine dual duct intake switching mechanism test bench according to claim 4, characterized in that: It also includes a measurement and control system, which includes a gas turbine real-time simulation system and a lower computer; the gas turbine real-time simulation system includes a first host computer and a second host computer; the first host computer is used for monitoring, controlling and alarming the simulation process and storing and displaying simulation data; the second host computer is used to control the gas turbine real-time simulation model; the lower computer includes a PLC measurement and control system, which is used to control the frequency conversion controller and the first servo controller.

6. A test method for a gas turbine dual duct intake switching mechanism test bench according to claim 5, characterized in that: The first host computer sends initial load condition information and electric push rod status information to the second host computer; the second host computer calculates a control signal based on the gas turbine real-time simulation model and transmits it to the lower computer through the data transmission network; the PLC measurement and control system in the lower computer calculates a speed setting value and inputs it into the frequency conversion controller and the first servo controller respectively; the frequency conversion controller controls the frequency conversion motor to drive the centrifugal air source fan (1) to work, and the first servo controller controls the first drive motor to drive the eddy current dynamometer to work; the switching mechanism does not work and maintains the initial state, that is, the switching baffle is on the outer duct side, and the inner duct flow pipe (10b) is closed; the torque, speed of the eddy current dynamometer and the flow data of the outer duct flow pipe (10a) are fed back to the second host computer through the data transmission network, and the gas turbine double duct intake switching mechanism test bench is operated in the forward mode.

7. The test method of a gas turbine dual duct intake switching mechanism test bench according to claim 6, characterized in that: The method of switching from the forward working mode to the reverse working mode is also included, which is specifically: The first host computer sends a gas turbine load reduction operating condition switching instruction to the second host computer; the second host computer calculates a control signal based on a real-time simulation model of the gas turbine and transmits the control signal to the lower computer through a data transmission network; a PLC measurement and control system in the lower computer calculates a speed setting value and inputs the speed setting value into a frequency conversion controller and a first servo controller respectively; the frequency conversion controller reduces the speed of the centrifugal air source fan (1) by controlling the frequency conversion motor, the first servo controller reduces the speed of the eddy current dynamometer by using the first drive motor, and the other parts of the gas turbine double duct intake switching mechanism test bench remain unchanged; After the gas turbine dual duct intake switching mechanism test bench is operating stably under reduced operating conditions, the first host computer directly sends a control instruction to the switching mechanism, the switching mechanism starts to work, the second servo controller controls the electric push rod (15) to work through the second drive motor (6), the switch baffle is switched from the outer duct side to the inner duct side, and the displacement and force data of the electric push rod (15) are fed back to the first host computer; the first host computer feeds back the displacement and force data of the electric push rod (15) to the second host computer, and the second host computer feeds back the speed signal to the lower computer via the data transmission network in real time according to the change of the load speed of the gas turbine real-time simulation model from positive to negative, the PLC measurement and control system of the lower computer calculates the speed setting value and inputs it to the first servo controller, the first servo controller causes the eddy current dynamometer to switch from forward to reverse operation through the first drive motor, the centrifugal air source fan (1) remains unchanged, and the gas turbine dual duct intake switching mechanism test bench is currently in the intermediate switching working mode; When the switching damper is on the inner duct side, the outer duct flow pipe (10a) is closed, the switching mechanism stops running, and the current gas turbine dual duct intake switching mechanism test bench is running in the reverse working mode.

8. A computer device / equipment / system comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 6 to 7.

9. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 6 to 7 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 6 to 7 are implemented.

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