A gas turbine dual-duct intake switching mechanism test bench, method, program and storage medium

Abstract

The present application belongs to the technical field of semi-physical test, and particularly relates to a test bench, a method, a program and a storage medium for a dual-duct intake switching mechanism of a gas turbine. The present application can simulate the flow distribution of the inner and outer ducts in the switching process of the reversible turbine of the reversible gas turbine, and can be used for steady-state flow characteristic test of the dual-duct of the gas turbine running alone and dynamic flow test under different operation modes of the electric cylinder. The present application can realize the flow distribution characteristic research of the dual-duct of the gas turbine under multiple working conditions and the aerodynamic characteristic research under different operation modes of the electric cylinder, and solve a series of complex problems caused by the coupling of the reversible turbine of the gas turbine and the switching mechanism, thereby providing a theoretical basis and technical support for the overall performance analysis of the reversible gas turbine.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of semi-physical test, and particularly relates to a gas turbine double-duct intake switching mechanism test bench, method, program and storage medium. BACKGROUND

[0002] Ship gas turbines are widely used due to their advantages of large power, small size, light weight and small pollution. However, the ship gas turbine cannot complete the reversing operation alone and must rely on the controllable pitch propeller (CPP), the reversing transmission device and other equipment to realize the reversing operation, which limits the operation capacity of the gas turbine and the maneuverability of the ship and directly affects the safety and efficiency of the ship. At present, the controllable pitch propeller, the reversing gear box and the electric transmission device are used for the reversing operation of most ships, which realizes the reversing operation but limits the maneuverability of the ship to a certain extent. The controllable pitch propeller has a switching mechanism installed in the hub of the propeller, and the propeller hub has a large diameter, which causes the efficiency to decrease by 0.5% to 1%. It takes one minute to complete the process from full-speed ahead to full-speed astern. The reversing gear box and the electric transmission device are difficult to realize at high power, and it takes five minutes or even more time to complete the process from full-speed ahead to full-speed astern. In view of this, scholars have developed a direct reversing gas turbine based on the gas turbine body. The gas turbine has the same independent forward and reverse rotation capability as the diesel engine, and can complete the full-speed forward, full-speed reverse and stopping of the propeller without the aid of other devices. By changing the ship control strategy, the maneuverability of the ship can be effectively improved, and the emergency avoidance capability of the ship can be greatly improved.

[0003] The direct reversing gas turbine is divided into a blocking type and a flow separation type. The blocking type has an increased overall size and weight compared with the flow separation type. Based on this situation, the flow separation type is selected. Compared with the conventional gas turbine, the main difference between the direct reversing gas turbine and the conventional gas turbine lies in that the power turbine of the direct reversing gas turbine is a double-duct structure. The turbine blades in the inner duct are called forward turbine blades, which realize the forward rotation of the gas turbine. The turbine blades in the outer duct are called reverse turbine blades, which realize the reverse rotation of the gas turbine. At present, the reversing technology mainly focuses on gas dynamics and reverse turbine blade structure and stays at the theoretical level, ignoring the coupling characteristics between the reversing turbine double-duct switching mechanism and the gas turbine. The performance of the reversing turbine double-duct switching mechanism is crucial to the switching performance of the gas turbine. SUMMARY

[0004] The application aims 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 the reversible gas turbine during the switching process under variable working conditions, and the maneuverability of the switching mechanism under different operation modes, thereby better analyzing the influence of the reversible turbine dual-duct structure on the overall performance of the marine gas turbine.

[0005] The 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 pipeline and an inner duct flow pipeline; 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 type 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 with the output end of the centrifugal air source fan, the outlet of the switching channel is connected with the outer duct flow pipeline and the inner duct flow pipeline through a shunt pipeline respectively, one section of the outer duct flow pipeline and the inner duct flow pipeline is selected as a flow measurement pipeline respectively, and the flow measurement pipeline is provided with a vortex flowmeter; the second servo controller is used to control the second drive motor, and the second drive motor is used to drive the ball screw type electric cylinder to move linearly left and right; the ball screw type electric cylinder is connected with the electric push rod, and the electric push rod is connected with the switching baffle; the ball screw type electric cylinder is provided with a displacement sensor, and the electric push rod is provided with a torque sensor.

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

[0007] Further, the output end of the centrifugal air source fan is connected with the inlet of the switching channel through an air inlet contraction section and a variable diameter section.

[0008] Further, the load subsystem comprises a first servo controller, a first drive motor, a torque instrument and an electric eddy current dynamometer; the first servo controller is used to control the first drive motor, the first drive motor is used to drive the electric eddy current dynamometer, and the torque instrument is used to collect the torque of the electric eddy current dynamometer during operation.

[0009] Further, a measurement and control system is further included, the measurement and control system comprising a gas turbine real-time simulation system and a lower computer; the gas turbine real-time simulation system comprising a first upper computer and a second upper computer; the first upper computer being used for monitoring, controlling and alarming of a simulation process, and for storing and displaying simulation data; the second upper computer being used for controlling the gas turbine real-time simulation model; the lower computer comprising a PLC measurement and control system, and being used for controlling the frequency converter and the first servo controller.

[0010] A test method based on the gas turbine dual-duct intake switching mechanism test bench, the first upper computer sends initial load working condition information and electric push rod state information to the second upper computer; the second upper computer calculates control signals according to the gas turbine real-time simulation model, and transmits the control signals to the lower computer through a data transmission network; the PLC measurement and control system in the lower computer calculates a rotating speed setting value and inputs the rotating speed setting value to the frequency converter and the first servo controller respectively; the frequency converter controls a variable frequency motor to drive a centrifugal air source fan to work, and the first servo controller controls a first driving motor to drive an eddy current dynamometer to work; the switching mechanism does not work, and remains in an initial state, i.e., the switching baffle is at the outer duct side, and the inner duct flow pipeline is closed; torque, rotating speed of the eddy current dynamometer and flow data of the outer duct flow pipeline are fed back to the second upper computer through the data transmission network, and the gas turbine dual-duct intake switching mechanism test bench operates in a forward mode.

[0011] Further, a method for switching from the forward working mode to a reverse working mode is further included, and the method specifically comprises:

[0012] The first upper computer sends a gas turbine load reduction working condition switching instruction to the second upper computer; the second upper computer calculates control signals according to the gas turbine real-time simulation model, and transmits the control signals to the lower computer through the data transmission network; the PLC measurement and control system in the lower computer calculates a rotating speed setting value and inputs the rotating speed setting value to the frequency converter and the first servo controller respectively; the frequency converter controls the variable frequency motor to reduce the rotating speed of the centrifugal air source fan, the first servo controller controls the first driving motor to reduce the rotating speed of the eddy current dynamometer, and the rest of the gas turbine dual-duct intake switching mechanism test bench remains unchanged;

[0013] After the gas turbine double-dual-flow intake switching mechanism test bench is stably operated under the reduced condition, 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 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 stress data of the electric push rod are fed back to the first host computer; the first host computer feeds back the displacement and stress data of the electric push rod to the second host computer, the second host computer feeds back the speed signal to the lower computer in real time according to the change of the load speed of the real-time simulation model of the gas turbine from positive to negative, the PLC measurement and control system of the lower computer calculates the speed setting value and inputs the speed setting value into the first servo controller, the first servo controller makes the electric eddy current dynamometer work from positive rotation to reverse rotation through the first drive motor, the centrifugal air source fan keeps unchanged, and the current gas turbine double-dual-flow intake switching mechanism test bench is in the intermediate switching mode.

[0014] When the switching baffle is on the inner duct side, the outer duct flow pipeline is closed, the switching mechanism stops working, and the current gas turbine double-dual-flow intake switching mechanism test bench is operated in the reverse mode.

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

[0016] A computer readable storage medium has a computer program / instruction stored thereon, and the computer program / instruction is executed by a processor to realize the steps of the above-mentioned test method based on the gas turbine double-dual-flow intake switching mechanism test bench.

[0017] A computer program product comprises a computer program / instruction, and the computer program / instruction is executed by a processor to realize the steps of the above-mentioned test method based on the gas turbine double-dual-flow intake switching mechanism test bench.

[0018] The beneficial effects of the present application are as follows:

[0019] The present application can simulate the flow distribution of the inner and outer ducts in the switching process of the reverse turbine of the reverse gas turbine, can be used for the steady flow characteristic test of the gas turbine double-dual-flow under separate operation and the dynamic flow test under different operation modes of the electric cylinder, can realize the flow distribution characteristic research of the gas turbine double-dual-flow under multiple working conditions and the aerodynamic characteristic research under different operation modes of the electric cylinder, solves a series of complex problems caused by the coupling of the reverse turbine of the gas turbine and the switching mechanism, and provides a theoretical basis and technical support for the overall performance analysis of the reverse gas turbine. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1It is a schematic diagram of a test bench of a dual-duct intake switching mechanism of a gas turbine in the application.

[0021] Figure 2 It is a general framework diagram of a test method of a dual-duct intake switching mechanism of a gas turbine in the application. DETAILED DESCRIPTION

[0022] The application will be further described below in combination with the drawings.

[0023] Referring to Figure 1 A test bench of a dual-duct intake switching mechanism of a gas turbine comprises a centrifugal air source fan 1, an intake contraction section 2, a variable diameter section 3, an inlet flange plate 4, a torque sensor 5, a second driving motor 6, a second servo controller, a ball screw type electric cylinder 7, an electric push rod 15, an outlet flange plate 14, a shunt pipeline 9, an outer duct flow pipeline 10a, an inner duct flow pipeline 10b, an outer duct flow measurement pipeline 11a, an inner duct flow measurement pipeline 11b, support plates 12a and 12b, a matching electrical cabinet 13, a first connecting rod 8, a load subsystem and a measurement and control system.

[0024] A variable frequency controller is used to control a variable frequency motor, and the variable frequency motor is used to drive the centrifugal air source fan 1; the switching mechanism comprises a second servo controller, a second driving 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 output end of the centrifugal air source fan 1 is connected with the inlet of the switching channel through the intake contraction section 2 and the variable diameter section 3, the outlet of the switching channel is connected with the outer duct flow pipeline 10a and the inner duct flow pipeline 10b through the shunt pipeline 9, one section is selected as a flow measurement pipeline on the outer duct flow pipeline 10a and the inner duct flow pipeline 10b respectively, and the flow measurement pipeline is provided with a vortex flowmeter; the second servo controller is used to control the second driving motor 6, the second driving motor 6 is used to drive the ball screw type electric cylinder 7 to move linearly left and right, the ball screw type electric cylinder 7 is connected with the electric push rod 15, and the electric push rod 15 is connected with the switching baffle; the ball screw type electric cylinder 7 is provided with a displacement sensor, and the electric push rod 15 is provided 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 at the outer duct side, the inner duct flow pipeline 10b is closed, at this time, the gas state under the forward operation of the reversible turbine of the simulated gas turbine is simulated; when the switching baffle is at the inner duct side, the outer duct flow pipeline 10a is closed, at this time, the gas state under the reverse operation of the reversible turbine of the simulated gas turbine is simulated; when the switching baffle is between the two sides, the switching state of the gas in the inner and outer ducts of the reversible turbine of the simulated gas turbine is simulated.

[0026] The load subsystem comprises a first servo controller, a first driving motor, a torque instrument and an eddy current dynamometer; the first servo controller is used for controlling the first driving motor, the first driving motor is used for driving the eddy current dynamometer, and the torque instrument is used for collecting the torque of the eddy current dynamometer during operation.

[0027] The measurement and control system comprises a gas turbine real-time simulation system and a lower computer; the gas turbine real-time simulation system comprises 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 comprises a PLC measurement and control system, and is used for controlling the frequency converter controller and the first servo controller.

[0028] As shown in Figure 2 the test method based on the gas turbine dual-duct intake switching mechanism test bench comprises the following contents.

[0029] The gas turbine dual-duct intake switching mechanism test bench is started, first, the first upper computer sends initial load working condition information and electric push rod state information to the second upper computer; the second upper computer calculates control signals according to the gas turbine real-time simulation model and transmits the control signals to the lower computer through a data transmission network; the PLC measurement and control system in the lower computer calculates speed set values and inputs the speed set values to the frequency converter controller and the first servo controller respectively; the frequency converter controller controls the variable frequency motor to drive the centrifugal air source fan to work, and the first servo controller controls the first driving motor to drive the eddy current dynamometer to work; the switching mechanism does not work and keeps the initial state, that is, the switching baffle is on the outer duct side and the inner duct flow pipeline is closed; the torque, speed of the eddy current dynamometer and the flow data of the outer duct flow pipeline are fed back to the second upper computer through the data transmission network, the gas turbine real-time simulation model, the load subsystem and the switching mechanism subsystem are stably operated, and the gas turbine dual-duct intake switching mechanism test bench is operated in the forward mode.

[0030] When the forward working mode is switched to the reverse working mode:

[0031] The first upper computer sends a gas turbine load reduction working condition switching instruction to the second upper computer; the second upper computer calculates control signals according to the gas turbine real-time simulation model and transmits the control signals to the lower computer through the data transmission network; the PLC measurement and control system in the lower computer calculates speed set values and inputs the speed set values to the frequency converter controller and the first servo controller respectively; the frequency converter controller controls the variable frequency motor to reduce the speed of the centrifugal air source fan, the first servo controller controls the first driving motor to reduce the speed of the eddy current dynamometer, and the rest of the gas turbine dual-duct intake switching mechanism test bench keeps the state unchanged;

[0032] After the dual-duct gas turbine intake switching mechanism test bench is stably operated under the reduced condition, 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 to work through the second drive motor, the switching baffle switches from the outer duct side to the inner duct side, and the displacement and stress data of the electric push rod are fed back to the first host computer; the first host computer feeds back the displacement and stress data of the electric push rod to the second host computer, the second host computer feeds back the speed signal to the lower computer 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 makes the electric eddy current dynamometer work from positive rotation to reverse rotation through the first drive motor, the centrifugal air source fan keeps the state unchanged, and the current dual-duct gas turbine intake switching mechanism test bench is in the intermediate switching mode.

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

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

[0035] The important parameters of the semi-physical test system are transmitted to the first host computer through the data interface for display, storage and the parameters of the gas turbine real-time simulation model including the combustion chamber outlet temperature, the high-pressure shaft speed, the low-pressure shaft speed, the power turbine speed, the power turbine output torque, the low-pressure turbine exhaust temperature, the high and low pressure compressor output pressure and the output pressure of the high and low pressure turbine, the first host computer controls the working condition of the reversible semi-physical test system through the data interface, takes the full load power as the reference, sends the forward working condition instruction, realizes the forward rotation of the reversible gas turbine (simulates the forward rotation of the marine gas turbine), sends the forward reduced working condition instruction, realizes the forward rotation deceleration of the reversible gas turbine, sends the electric push rod control instruction, realizes the switching of the reversible gas turbine from forward rotation to reverse rotation or from reverse rotation to forward rotation (simulates the switching of the marine gas turbine from forward rotation to reverse rotation), and sends the reverse rotation raised working condition instruction, realizes the reverse rotation acceleration of the reversible gas turbine.

[0036] The test bench for the dual-duct intake switching mechanism of the gas turbine can simulate the flow distribution of the inner and outer ducts in the switching process of the reversible turbine of the reversible gas turbine, can be used for steady flow characteristic tests of the dual-duct of the gas turbine running alone and dynamic flow tests of the electric cylinder under different running modes, can realize flow distribution characteristic research of the dual-duct of the gas turbine under multiple working conditions and aerodynamic characteristic research under different electric cylinder running modes, solves a series of complex problems caused by the coupling of the reversible turbine of the gas turbine and the switching mechanism, and provides a theoretical basis and technical support for overall performance analysis of the reversible gas turbine.

[0037] The above merely provides the preferred embodiments of the present application but is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gas turbine dual-duct intake switching mechanism test bench, characterized by: The invention comprises a frequency conversion controller, a frequency conversion motor, a centrifugal air source blower (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 blower (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 blower, and the outlet of the switching channel is connected to the outer duct flow pipe through a diversion pipe (9). The outer duct (10a) is connected to the inner duct flow pipe (10b), and 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 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 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); 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 in 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 in reverse operation; when the switching baffle is between the two sides, it simulates the gas switching state between the inner and outer ducts in the gas turbine reversing turbine; 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.

2. 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 blower (1) is connected to the inlet of the switching channel via an air intake contraction section (2) and a diameter-reducing section (3).

3. A gas turbine dual-duct intake switching mechanism test bench according to claim 1, 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 for controlling the gas turbine real-time simulation model; the lower computer includes a PLC measurement and control system for controlling the frequency conversion controller and the first servo controller.

4. A test method for a gas turbine dual-duct intake switching mechanism test bench according to claim 1, characterized in that: The first host computer sends initial load operating 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 and flow data of the eddy current dynamometer and the outer duct flow pipe (10a) 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 the forward mode.

5. The test method of a gas turbine dual duct intake switching mechanism test bench according to claim 4, characterized in that: The method of switching from the forward working mode to the reverse working mode is also included, 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 via 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 blower (1) by controlling the frequency conversion motor, and the first servo controller reduces the speed of the eddy current dynamometer via the first drive motor, while the other parts of the gas turbine dual duct intake switching mechanism test bench remain unchanged; After the gas turbine dual duct intake switching mechanism test bench is stably operated under the reduced working condition, 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 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 (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 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 causes the eddy current dynamometer to switch from forward to reverse operation through the first drive motor, and the centrifugal air source fan (1) remains unchanged. 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 operating, and the current gas turbine dual duct intake switching mechanism test bench operates in a reverse working mode.

6. A computer device / apparatus / 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 4 to 5.

7. 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 4 to 5 are implemented.

8. 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 4 to 5 are implemented.

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