System and method for testing blast loss of double-flow-channel turbine based on frequency conversion control

Abstract

The invention provides a double-flow-channel turbine blast loss testing system and method based on frequency conversion control, and relates to the technical field of gas turbines, and the method comprises a variable frequency motor, a torque meter and a double-flow-channel turbine; wherein the double-flow-channel turbine is rotationally connected with the variable frequency motor through a torque meter, main shafts of all the component parts are adjusted and centered, and the torque meter measures the resistance torque and the rotating speed of the turbine in the rotating process of the variable frequency motor. The rotating speed of the turbine can be adjusted, and the power consumption and torque of the turbine at different rotating speeds are measured so as to obtain the blast loss parameter.

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 reversible gas turbine adopts the design concept of double gas channels + double-layer turbine blades, and the outer channel is the reversing channel. The inner channel is the forward channel, and the gas flow route is distributed through the gas switching mechanism at the front end. When the gas only flows through the lower forward blades, the turbine rotor rotates forward, and when the gas only flows through the upper reverse blades, the turbine rotor rotates reversely. In most operating conditions, the reversible gas turbine only uses the forward function. At this time, when the gas flows through the forward channel and drives the forward blades to work, there is no gas flowing through the reverse blade position, and the reverse blade is in a reverse rotation state. In this state, the reverse blade continuously stirs the nearby gas, generating a large amount of disordered and chaotic gas flow on the surface of the reverse blade, thereby causing power loss. The lost power is the blast loss caused by the reversal of the reverse blade. The existence of blast loss reduces the power output of the forward turbine to the outside and affects the overall efficiency of the gas turbine.

[0003] Due to its shape and structure, the double-channel turbine needs to take into account the additional power consumption caused by the reverse rotation of the blades, i.e., the blast loss, when determining its operating characteristics. This parameter needs to be measured with the help of certain test methods. Since there is little research on the structure of the double-channel turbine, there is a lack of similar test device design in the prior art. 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 a dual-channel turbine blast loss test system and method based on variable frequency control provided by the present invention, 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] The dual-channel turbine is rotationally connected to the variable frequency motor via a torque meter, and the main shafts of the components are adjusted and aligned. The torque meter measures the resistance torque and rotation 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 and a base;

[0011] The variable frequency motor is installed on the bearing seat. The variable frequency motor, the bearing seat, the torque meter and the double-flow channel turbine are fixed on the same base. When the variable frequency motor rotates, centering and free rotation are guaranteed 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 with 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 vane is compressed and installed to the turbine through the first blind plate and bolts, and the primary flow channel guide vane is fixed to the first blind plate through bolts.

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

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

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

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

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

[0023] Step S4: installing a second blind plate in the exhaust direction to seal the cascade as a whole;

[0024] Step S5: Install the main flow channel guide vane and the secondary flow channel guide vane, 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 vane and the secondary flow channel guide vane;

[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 is stabilized, 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 dissolving agent.

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

[0030] 1. The present invention adopts a test system structure of a variable frequency motor, 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, which is particularly suitable for users to measure the blast loss of the dual-channel turbine under different working conditions, so that the present invention has the functional characteristics 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 foaming materials to seal the double-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 in the specific implementation manner through the introduction of specific technical features and technical solutions. Through the introduction of these technical features and technical solutions, those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0036] Figure 1 It is an overall schematic diagram of the 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 is described in detail below in conjunction with specific embodiments. The following embodiments 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 of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0039] The embodiment of the present invention provides a double-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 through the torque meter 201, and the main shafts of the components are adjusted and aligned. The torque meter 201 measures the resistance torque and speed of the turbine during the rotation of the variable frequency motor 101. The variable frequency motor 101 is installed on the bearing seat 501. 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, the bearing seat 501 ensures centering and free rotation.

[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-channel turbine is a single-stage or multi-stage axial flow turbine, which adopts the design of axial air intake and radial exhaust. The double-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 gas inlet of the double-channel turbine 301 and is arranged vertically; the second blind plate 305 is located at the exhaust gas outlet of the double-channel turbine 301 and is arranged horizontally, so that the double-channel turbine 301 maintains overall air tightness.

[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 gaskets 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 compressed and installed 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] The system uses foaming material during the test process. When the main flow condition is tested, the main flow guide vane 303 cascade is blocked, and when the secondary flow condition is tested, the secondary flow guide vane 302 cascade is blocked.

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

[0049] 1. Remove the main flow channel guide vane 303 and the secondary flow channel guide vane 302 to expose the moving blade cascade;

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

[0051] 3. After the foaming material solidifies, perform modification, scrape off the protruding blade part, and check whether there is residual glue blocking the unblocked blade air 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 vane 303 and the secondary flow channel guide vane 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 vane 303 and the secondary flow channel guide vane 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 plugging and use a degumming agent to remove the 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 motor drives the turbine 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 through 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 couplings 401 and 402 to drive it to rotate. The torque meter 201 on the shaft can measure the resistance torque and speed of the turbine during rotation. Through the present invention, the additional power consumption generated by the turbine blades during rotation due to the multi-channel design and the double-layer blade structure under different pressures, speeds and rotation directions can be measured. 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, the bearing seat 501, the torque meter 201 and the dual-channel turbine 301 should be fixed on the same base, and the main shafts of the various components should be adjusted and aligned. The test bench requires the high-speed rotation of the device, and should meet the lubricating oil supply of the bearing seat 501 and the dual-channel turbine 301, such as the lubricating oil grade and lubricating oil pressure, etc. The power supply should meet the power supply 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 coupling is preferably a bellows coupling, which can be sacrificed in the event of a failure to achieve overall protection of the test piece and the device.

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

[0064] The double-channel turbine 301 also includes a secondary channel guide vane 302 and a main channel guide vane 303. The secondary channel guide vane 302 is installed to the turbine through the first blind plate 304 and bolts, and the main channel guide vane 303 is fixed to the first blind plate 304 by bolts. Preferably, the gap between the plate cover and the double-channel turbine 301 is adjusted by a gasket, so that the requirements for the guide vane gap in the turbine design can be met, so that the present invention can more accurately measure the turbine under working conditions. Preferably, the blind plates 304 and 305 are made of stainless steel, the end faces are polished and installed with gaskets to achieve the overall airtightness of the turbine. 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 air pressure in the turbine is increased by inflating the air pipe joint to achieve the test of the blast loss 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, it is necessary to use a lightweight foam material, such as polyurethane foam, to block the moving blade cascade of the dual-flow channel turbine 301. The specific operation is to block the moving blade cascade of the main flow channel when testing the main flow channel condition, and to block the moving blade cascade of the secondary flow channel when testing the secondary flow channel condition. The purpose is to prevent the cascade from doing work on the air and thus affecting the measurement.

[0067] The 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 to rotate by a motor, 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 know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions 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 as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

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

[0070] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

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 channel turbine (301); The dual-flow 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).

2. The double-channel turbine blast loss test system based on variable frequency control according to claim 1 is characterized in that: The first coupling (401) and the 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-flow channel turbine (301) through the first coupling (401) and the second coupling to drive the dual-flow channel turbine (301) to rotate.

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

6. The double-channel turbine blast loss test system based on variable frequency control according to claim 1 is characterized in that: The dual-channel turbine (301) is provided with a first blind plate (304) and a second blind plate (305), wherein the first blind plate (304) is located at the fuel gas inlet of the dual-channel turbine (301) and is arranged vertically; and 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 air tightness; 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.

7. The double-channel turbine blast loss test system based on variable frequency control according to claim 6 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).

8. The double-channel turbine blast loss test system based on variable frequency control according to claim 7 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 installed to the turbine by pressing through the first blind plate (304) and bolts, and the primary flow channel guide vane (303) is fixed to the first blind plate (304) by bolts.

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

10. A method for testing the blast loss of a double-channel turbine based on variable frequency control, based on the double-channel turbine blast loss testing system based on variable frequency control according to any one of claims 1 to 9, characterized in that: include: Step S1: removing the primary flow channel guide vane (303) and the secondary flow channel guide vane (302) to expose the moving blade cascade; Step S2: using a lightweight foaming material to block the primary flow channel guide vane (303) cascade or the secondary flow channel guide vane (302) cascade; Step S3: After the foaming material is solidified, it is modified by scraping off the protruding part of the cascade and checking whether there is residual glue blocking the unblocked cascade 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 using this component to press and fix the main flow channel guide vane (303) and the secondary flow channel guide vane (302); Step S6: starting the variable frequency motor (101); Step S7: slowly adjusting the frequency converter of the variable frequency motor (101) so that the rotation speed increases steadily; Step S8: after reaching a predetermined frequency and the rotation speed is stabilized, 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 dissolving agent.

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