Variable frequency control based double flow channel turbine blast loss test system and method

Abstract

The application provides a double-flow turbine air-blast loss testing system and method based on variable frequency control, and relates to the technical field of gas turbines. The method comprises a variable frequency motor, a torque meter and a double-flow turbine. The double-flow turbine is rotationally connected with the variable frequency motor through the torque meter, and the main shafts of each component are adjusted to be centered. The torque meter measures the resistance torque and the rotating speed of the turbine during the rotation of the variable frequency motor. The application can adjust the rotating speed of the turbine, measure the power consumption and the torque of the turbine at different rotating speeds, and thus obtain the air-blast loss parameters.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular to a dual-flow-channel turbine blast loss testing system and method based on variable frequency control. Background Art

[0002] The reversing gas turbine utilizes a dual-channel design with two layers of turbine blades. The outer channel serves as the reversing channel, while the inner channel serves as the forward channel. A gas switching mechanism at the front distributes the gas flow. When gas flows only through the lower forward blades, the turbine rotor rotates in the forward direction; when gas flows only through the upper reverse blades, the turbine rotor rotates in the reverse direction. Under most operating conditions, the reversing gas turbine uses only the forward function. While gas flows through the forward channel, driving the forward blades, no gas flows through the reverse blades, forcing them into reverse rotation. In this state, the reverse blades continuously stir the surrounding gas, creating a large amount of chaotic gas flow on their surfaces, resulting in power loss. This power loss is the airflow loss caused by the reverse blades' reversing motion. This airflow loss reduces the power output of the forward turbine and affects the overall efficiency of the gas turbine.

[0003] Due to the shape and structure of a twin-channel turbine, determining its operating characteristics requires accounting for the additional power consumption caused by the counter-rotating blades, known as blast losses. This parameter requires specific test methods to measure. However, due to limited research on this structure, similar test equipment designs are currently lacking. Summary of the Invention

[0004] In view of the defects in the prior art, the present invention provides a dual-channel turbine blast loss testing system and method based on variable frequency control.

[0005] According to the present invention, a dual-channel turbine blast loss test system and method based on variable frequency control is provided, and the scheme is as follows:

[0006] In a first aspect, a dual-channel turbine blast loss test system based on variable frequency control is provided, the system comprising: a variable frequency motor, a torque meter, and a dual-channel turbine;

[0007] Among them, the dual-channel turbine and the variable frequency motor are rotationally connected through a torque meter, and the main shafts of each component are adjusted and aligned. The torque meter measures the resistance torque and speed of the turbine during the rotation of the variable frequency motor.

[0008] Preferably, a first coupling and a second coupling are connected at both ends of the torque meter, and the torque generated by the variable frequency motor is transmitted to the dual-channel turbine through the first coupling and the second coupling to drive the dual-channel turbine to rotate.

[0009] Preferably, the first coupling and the second coupling are bellows couplings. When a fault occurs, the first coupling and the second coupling are automatically disconnected to achieve overall protection for each test piece and the system.

[0010] Preferably, the system further comprises: a bearing seat, a base;

[0011] The variable frequency motor is mounted on a bearing seat. The variable frequency motor, the bearing seat, the torque meter and the dual-channel turbine are fixed on the same base. When the variable frequency motor rotates, centering and free rotation are ensured by the bearing seat.

[0012] Preferably, the multi-channel turbine is a single-stage or multi-stage axial flow turbine, adopting an axial intake and radial exhaust design.

[0013] Preferably, the dual-channel turbine is provided with a first blind plate and a second blind plate to ensure that the dual-channel turbine maintains overall air tightness;

[0014] A hole is opened on one of the blind plates to install an air pipe joint, a pressure gauge and a valve. Before starting the test, the turbine is inflated through the air pipe joint to increase the air pressure so that the blast loss test under different pressures can be achieved.

[0015] Preferably, the first blind plate and the second blind plate are made of stainless steel, with polished end faces and gaskets installed to adjust the gap between them and the dual-channel turbine.

[0016] Preferably, the dual-flow channel turbine further comprises: secondary flow channel guide vanes and primary flow channel guide vanes;

[0017] The secondary flow channel guide vanes are compressed and mounted to the turbine through the first blind plate and bolts, and the primary flow channel guide vanes are fixed to the first blind plate through bolts.

[0018] Preferably, the system uses foaming material during the test process, and the main channel guide vane cascade is blocked when the main channel working condition is tested, and the secondary channel guide vane cascade is blocked when the secondary channel working condition is tested.

[0019] In a second aspect, a method for testing blast loss of a dual-channel turbine based on variable frequency control is provided, the method comprising:

[0020] Step S1: removing the primary flow channel guide vanes and the secondary flow channel guide vanes to expose the moving blade cascade;

[0021] Step S2: using a lightweight foam material to block the primary flow channel guide vane cascade or the secondary flow channel guide vane cascade;

[0022] Step S3: After the foam material is solidified, it is modified by scraping off the protruding part of the cascade blades and checking whether there is any residual glue blocking the unblocked cascade blade air duct;

[0023] Step S4: Install a second blind plate in the exhaust direction to completely block the cascade;

[0024] Step S5: Install the main flow channel guide vanes and the secondary flow channel guide vanes, install a thermocouple on the first blind plate to detect the air flow temperature, and use this component to press and fix the main flow channel guide vanes and the secondary flow channel guide vanes;

[0025] Step S6: starting the variable frequency motor;

[0026] Step S7: slowly adjusting the frequency converter of the variable frequency motor so that the speed increases steadily;

[0027] Step S8: After reaching the predetermined frequency and the speed stabilizes, the data measured by the torque meter is recorded;

[0028] Step S9: After the experiments of each speed condition are completed, the plugging is removed and the residual glue is removed using a glue remover.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention adopts a variable frequency motor test system structure, thereby being able to adjust the rotation speed of the dual-channel turbine;

[0031] 2. The present invention can freely adjust the rotation speed of the dual-channel turbine during the test process, which is particularly suitable for users who need to measure the blast loss of the dual-channel turbine under different working conditions, thereby making the present invention capable of adapting to a wider range of measurement needs;

[0032] 3. The present invention uses the first blind plate and the second blind plate to seal the turbine inlet and exhaust and fix the primary and secondary flow channel guide vane cascades, which can facilitate the pressure test of the turbine, facilitate the implementation of the test closer to the actual operating conditions, and facilitate the measurement of more accurate resistance;

[0033] 4. By using lightweight foam material to seal the dual-channel turbine blades, the influence of additional power loss caused by the blades stirring the air during the test on the measurement is avoided. It also has the function of preventing faults such as vibration caused by internal flow.

[0034] Other beneficial effects of the present invention will be explained through the introduction of specific technical features and technical solutions in the specific implementation methods. Those skilled in the art should be able to understand the beneficial technical effects brought about by the introduction of these technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0036] Figure 1 Schematic diagram of the overall system of the present invention.

[0037] Figure numerals: 101, variable frequency motor; 201, torque meter; 301, dual-channel turbine; 302, secondary channel guide vane; 303, primary channel guide vane; 304, first blind plate; 305, second blind plate; 401, first coupling; 402, second coupling; 501, bearing seat; 601, base. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0039] The embodiment of the present invention provides a dual-channel turbine blast loss test system based on variable frequency control, referring to Figure 1 As shown, the system specifically includes: a variable frequency motor 101, a torque meter 201, a dual-channel turbine 301, a bearing seat 501, and a base 601.

[0040] The dual-channel turbine 301 is rotationally connected to the variable-frequency motor 101 via a torque meter 201. The main shafts of the various components are aligned and adjusted. The torque meter 201 measures the turbine's resistance torque and speed during the rotation of the variable-frequency motor 101. The variable-frequency motor 101 is mounted on a bearing seat 501. The motor 101, bearing seat 501, torque meter 201, and dual-channel turbine 301 are fixed to the same base 601. The bearing seat 501 ensures centering and free rotation when the variable-frequency motor 101 rotates.

[0041] The first coupling 401 and the second coupling 402 are connected at both ends of the torque meter 201 . The torque generated by the variable frequency motor 101 is transmitted to the dual-channel turbine 301 through the first coupling 401 and the second coupling to drive the dual-channel turbine 301 to rotate.

[0042] The first coupling 401 and the second coupling 402 are bellows couplings. When a fault occurs, the first coupling 401 and the second coupling 402 can be automatically disconnected to achieve overall protection for each test piece and the system.

[0043] The multi-flow turbine is a single-stage or multi-stage axial-flow turbine with an axial intake and radial exhaust design. The dual-flow turbine 301 is equipped with a first blind plate 304 and a second blind plate 305. The first blind plate 304 is located vertically at the gas inlet of the dual-flow turbine 301. The second blind plate 305 is located horizontally at the exhaust outlet of the dual-flow turbine 301 to ensure the overall airtightness of the dual-flow turbine 301.

[0044] A hole is opened on one of the blind plates to install an air pipe joint, a pressure gauge and a valve. Before starting the test, the turbine is inflated through the air pipe joint to increase the air pressure so that the blast loss test under different pressures can be achieved.

[0045] The first blind plate 304 and the second blind plate 305 are made of stainless steel, with polished end faces and spacers installed to adjust the gap between them and the dual-channel turbine 301. The dual-channel turbine 301 also includes: a secondary channel guide vane 302 and a primary channel guide vane 303.

[0046] The secondary flow channel guide vane 302 is mounted to the turbine through the first blind plate 304 and bolts, and the primary flow channel guide vane 303 is fixed to the first blind plate 304 through bolts.

[0047] During the test, the system uses foaming material to block the main channel guide vane 303 cascade when conducting the main channel working condition test, and to block the secondary channel guide vane 302 cascade when conducting the secondary channel working condition test.

[0048] The present invention also provides a method for testing the blast loss of a dual-channel turbine based on variable frequency control, which specifically includes:

[0049] 1. Remove the main flow channel guide vanes 303 and the secondary flow channel guide vanes 302 to expose the moving blades;

[0050] 2. Use lightweight foam material to block the main flow guide vane 303 or the secondary flow guide vane 302

[0051] 3. After the foam material solidifies, perform modification, scrape off the protruding part of the blade, and check whether there is any residual glue blocking the unblocked blade duct;

[0052] 4. Install the second blind plate 305 in the exhaust direction to seal the cascade as a whole;

[0053] 5. Install the main flow channel guide vanes 303 and the secondary flow channel guide vanes 302, install a thermocouple on the first blind plate 304 to detect the air flow temperature, and use this component to press and fix the main flow channel guide vanes 303 and the secondary flow channel guide vanes 302;

[0054] 6. Start the variable frequency motor 101;

[0055] 7. Slowly adjust the frequency converter of the variable frequency motor 101 to steadily increase the speed;

[0056] 8. After reaching the predetermined frequency and the speed stabilizes, record the data measured by the torque meter 201;

[0057] 9. After completing the experiments at various speed conditions, remove the blockage and use a debonding agent to remove residual glue.

[0058] Next, the present invention will be described in more detail.

[0059] The present invention provides a dual-channel turbine blast loss test system based on variable frequency control. The system adopts a structure in which a variable frequency motor 101 is connected to a torque meter 201 and a dual-channel turbine 301. The turbine is driven by the motor to rotate, and the turbine speed can be adjusted. The power consumption and torque of the turbine at different speeds are measured to obtain the blast loss parameters.

[0060] The system includes a variable frequency motor 101, a bearing seat 501, and a coupling 401. The dual-channel turbine 301 is rotationally connected to the variable frequency motor 101 via a torque meter 201, wherein: when the variable frequency motor 101 rotates, the bearing seat 501 can ensure centering and free rotation, and transmit the torque to the dual-channel turbine 301 through the couplings 401 and 402 to drive its rotation. The torque meter 201 on the shaft can measure the resistance torque and speed of the turbine during rotation. The present invention can measure the additional power consumption generated by the turbine blades during rotation due to the multi-channel design and double-layer blade structure under different pressures, speeds and rotation directions. Among them, the multi-channel turbine 301 can be a single-stage or multi-stage axial flow turbine, adopting an axial intake and radial exhaust design.

[0061] Furthermore, the variable frequency motor 101, bearing block 501, torque meter 201, and dual-channel turbine 301 should be fixed to the same base, and the main shafts of each component should be aligned. The test bench is required to achieve high-speed rotation of the device and meet the lubricating oil supply requirements of the bearing block 501 and dual-channel turbine 301, such as the lubricating oil grade and pressure. The power supply should meet the power requirements of the variable frequency motor 101 and the instrument power supply requirements of the torque meter 201.

[0062] The various parts are connected by couplings 401 and 402 , wherein the couplings are preferably bellows couplings, which can be sacrificed in the event of a failure to achieve overall protection for the test piece and the device.

[0063] More specifically, the variable frequency motor 101 is preferably controllable by a frequency converter, thereby adjusting the rotation speed of the dual-channel turbine 301. The different frequencies of AC output by the frequency converter correspond to different rotation speeds of the variable frequency motor 101, and the actual rotation speed is measured by the torque meter 201.

[0064] The dual-channel turbine 301 also includes secondary channel guide vanes 302 and primary channel guide vanes 303. The secondary channel guide vanes 302 are mounted to the turbine via a first blind plate 304 and bolts, while the primary channel guide vanes 303 are fixed to the first blind plate 304 via bolts. Preferably, the gap between the plate cover and the dual-channel turbine 301 is adjusted by a gasket. This can meet the requirements for guide vane clearance in turbine design, thereby enabling the present invention to more accurately measure the turbine under working conditions. Preferably, the blind plates 304 and 305 are made of stainless steel, with polished end faces and installed with gaskets to achieve overall airtightness of the turbine. A hole is opened in one of the blind plates to install an air pipe connector, a pressure gauge, and a valve. Before starting the test, the air pressure in the turbine is increased through the air pipe connector to achieve blast loss testing under different pressures.

[0065] The torque meter 201 should be a high-speed model to ensure accurate testing of the turbine torque.

[0066] More specifically, during the test, the rotor blade cascades of the dual-channel turbine 301 are sealed with a lightweight foam material, such as polyurethane foam. Specifically, the primary channel rotor blade cascade is sealed during the primary channel test, and the secondary channel rotor blade cascade is sealed during the secondary channel test. This is to prevent the blade cascades from performing work on the air and thus affecting the measurement.

[0067] An embodiment of the present invention provides a dual-channel turbine blast loss testing system and method based on variable frequency control. The turbine is driven by a motor to rotate, and the turbine speed can be adjusted. The power consumption and torque of the turbine at different speeds are measured to obtain the blast loss parameters.

[0068] Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, and units provided by the present invention in purely computer-readable program code, it is entirely possible to implement the same functions of the system and its various devices, modules, and units provided by the present invention in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; the devices, modules, and units for implementing various functions can also be considered as both software modules implementing the method and structures within the hardware component.

[0069] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0070] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A dual-channel turbine blast loss test system based on variable frequency control, characterized in that: include: A variable frequency motor (101), a torque meter (201) and a dual-flow turbine (301); The dual-channel turbine (301) is rotationally connected to the variable frequency motor (101) via a torque meter (201), and the main shafts of the components are adjusted and aligned. The torque meter (201) measures the resistance torque and rotation speed of the turbine during the rotation of the variable frequency motor (101); The dual-channel turbine (301) is provided with a first blind plate (304) and a second blind plate (305). The first blind plate (304) is located at the fuel gas inlet of the dual-channel turbine (301) and is arranged vertically. The second blind plate (305) is located at the exhaust gas outlet of the dual-channel turbine (301) and is arranged horizontally, so that the dual-channel turbine (301) maintains overall airtightness. A hole is opened on one of the blind plates to install an air pipe joint, a pressure gauge and a valve. Before starting the test, the turbine is inflated through the air pipe joint to increase the air pressure so that the blast loss test under different pressures can be achieved.

2. The dual-channel turbine blast loss test system based on variable frequency control according to claim 1 is characterized in that: A first coupling (401) and a second coupling (402) are connected at both ends of the torque meter (201), and the torque generated by the variable frequency motor (101) is transmitted to the dual-channel turbine (301) through the first coupling (401) and the second coupling to drive the dual-channel turbine (301) to rotate.

3. The dual-channel turbine blast loss test system based on variable frequency control according to claim 2 is characterized in that: The first coupling (401) and the second coupling (402) are bellows couplings. When a fault occurs, the first coupling (401) and the second coupling (402) are automatically disconnected, thereby achieving overall protection for each test piece and the system.

4. The dual-channel turbine blast loss test system based on variable frequency control according to claim 1 is characterized in that: The system further comprises: a bearing seat (501), a base (601); The variable frequency motor (101) is mounted on a bearing seat (501), and the variable frequency motor (101), the bearing seat (501), the torque meter (201) and the dual-channel turbine (301) are fixed on the same base (601). When the variable frequency motor (101) rotates, centering and free rotation are ensured by the bearing seat (501).

5. The dual-channel turbine blast loss test system based on variable frequency control according to claim 1 is characterized in that: The dual-flow turbine is a single-stage or multi-stage axial-flow turbine, which adopts an axial air intake and radial exhaust design.

6. The dual-channel turbine blast loss test system based on variable frequency control according to claim 1 is characterized in that: The first blind plate (304) and the second blind plate (305) are made of stainless steel, have polished end surfaces, and are installed with gaskets to adjust the gap with the dual-channel turbine (301).

7. The dual-channel turbine blast loss test system based on variable frequency control according to claim 6 is characterized in that: The dual-flow channel turbine (301) further includes: a secondary flow channel guide vane (302) and a primary flow channel guide vane (303); The secondary flow channel guide vane (302) is mounted to the turbine by means of a first blind plate (304) and bolts, and the primary flow channel guide vane (303) is fixed to the first blind plate (304) by means of bolts.

8. The dual-channel turbine blast loss test system based on variable frequency control according to claim 7 is characterized in that: The system uses foaming material during the test process, and blocks the main channel guide vane (303) cascade when conducting the main channel working condition test, and blocks the secondary channel guide vane (302) cascade when conducting the secondary channel working condition test.

9. A method for testing the blast loss of a dual-channel turbine based on variable frequency control, based on the dual-channel turbine blast loss testing system based on variable frequency control according to any one of claims 1 to 8, characterized in that: include: Step S1: removing the primary flow channel guide vanes (303) and the secondary flow channel guide vanes (302) to expose the moving blade cascade; Step S2: using a lightweight foaming material to block the main flow channel guide vane (303) cascade or the secondary flow channel guide vane (302) cascade; Step S3: After the foam material is solidified, it is modified by scraping off the protruding part of the cascade blades and checking whether there is any residual glue blocking the unblocked cascade blade air duct; Step S4: installing a second blind plate (305) in the exhaust direction to seal the cascade as a whole; Step S5: installing the main flow channel guide vane (303) and the secondary flow channel guide vane (302), installing a thermocouple on the first blind plate (304) to detect the air flow temperature, and tightening and fixing the main flow channel guide vane (303) and the secondary flow channel guide vane (302) through this component; Step S6: starting the variable frequency motor (101); Step S7: slowly adjusting the frequency converter of the variable frequency motor (101) so that the speed increases steadily; Step S8: After reaching the predetermined frequency and the rotation speed stabilizes, the data measured by the torque meter (201) is recorded; Step S9: After the experiments of each speed condition are completed, the plugging is removed and the residual glue is removed using a glue remover.

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