Method and apparatus for obtaining turbine power

Abstract

The present application provides a method and device for obtaining the power of a turbine. The method includes: conducting a test on a test turbine under test conditions to obtain the actual measured power of the turbine measured by a dynamometer; after the test turbine completes the test, controlling the test turbine to enter coasting; obtaining the rotor energy change rate during the coasting process of the test turbine, and based on computational fluid dynamics (CFD), obtaining the blower power of the moving blades of the test turbine at the coasting speed; obtaining the true power of the test turbine according to the actual measured power of the turbine, the rotor energy change rate, and the blower power of the moving blades. Thus, the present application can obtain the true power of the test turbine without increasing the manufacturing cost, disassembly and assembly workload, and test cycle of the test turbine, improve the efficiency of obtaining the true power of the test turbine, and reduce the cost of obtaining the true power of the test turbine.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and particularly relates to a method and device for obtaining turbine power. Background Art

[0002] A gas turbine is one of the three major components of a heavy-duty gas turbine. It has high technical difficulty and great development risks. Verifying the design in stages through a series of special tests to gradually release risks is the basic path of R & D work. The turbine test constructs the thermal-power conversion mechanism of a high-temperature gas turbine and a real flow passage environment including unsteady effects, viscous effects, and three-dimensional flow effects, and has the function of systematically verifying the aerodynamic and cooling performance of the turbine. It is one of the important tests for the development of a gas turbine turbine. However, in related technologies, the process of obtaining the true power of the turbine is often complex and costly. Therefore, how to efficiently obtain the true power of the turbine while reducing the cost of obtaining the true power of the turbine has become an urgent problem to be solved. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems in related technologies to some extent.

[0004] According to a first aspect of the present application, a method for obtaining turbine power is provided, including: conducting a test on a test turbine under test conditions to obtain the measured turbine power measured by a dynamometer; after the test turbine completes the test, controlling the test turbine to enter coasting; obtaining the rotor energy change rate of the test turbine during coasting; and based on computational fluid dynamics (CFD), obtaining the blower power of the moving blades of the test turbine at the coasting speed; and obtaining the true power of the test turbine according to the measured turbine power, the rotor energy change rate, and the blower power of the moving blades.

[0005] According to a second aspect of the present application, a device for obtaining turbine power is provided, including: a first obtaining module for conducting a test on a test turbine under test conditions to obtain the measured turbine power measured by a dynamometer; a control module for controlling the test turbine to enter coasting after the test turbine completes the test; a second obtaining module for obtaining the rotor energy change rate of the test turbine during coasting and, based on computational fluid dynamics (CFD), obtaining the blower power of the moving blades of the test turbine at the coasting speed; and a determining module for obtaining the true power of the test turbine according to the measured turbine power, the rotor energy change rate, and the blower power of the moving blades.

[0006] The technical solutions provided by the embodiments of the present application at least include the following beneficial effects:

[0007] The present application provides a method for obtaining the power of a turbine. In the experiment of the present application, the disk cavity windage loss and the rotor bearing friction loss of the test turbine are eliminated. Without increasing the manufacturing cost, the disassembly and assembly workload, and the test cycle of the test turbine, the true power of the test turbine can be determined, the thermal power conversion efficiency of the test turbine can be better determined, the efficiency of obtaining the true power of the test turbine is improved, and the cost of determining the true power of the test turbine is reduced. Moreover, a rotor driving device is not required, and this solution can be applied to various types of turbine test benches, having wide applicability.

[0008] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings are used to better understand the solution of the present application and do not constitute a limitation to the present application. Among them:

[0010] Figure 1 is a schematic flow chart of a method for obtaining the power of a turbine provided by an embodiment of the present application;

[0011] Figure 2 is a schematic structural diagram of a turbine test bench provided by an embodiment of the present application;

[0012] Figure 3 is a schematic diagram of replacing the moving blades of the test turbine with flat blades provided by an embodiment of the present application;

[0013] Figure 4 is a schematic flow chart of another method for obtaining the power of a turbine provided by an embodiment of the present application;

[0014] Figure 5 is a schematic structural diagram of a device for obtaining the power of a turbine provided by an embodiment of the present application.

[0015] Figure 2 Reference numerals: 1 - main air inlet filter; 2 - main air inlet pipe; 3 - main air exhaust pipe; 4 - main air flow measuring device; 5 - heater; 6 - exhaust pipe; 7 - cold air inlet filter; 8 - cold air exhaust pipe; 9 - cold air flow measuring device; 10 - cold air distribution tank; 11 - inlet volute; 12 - test piece; 13 - exhaust volute; 14 - exhaust pipe; 15 - lubricating oil pump; 16 - lubricating oil tank; 17 - oil return pump; 18 - oil filter; 19 - drainage well; 20 - dynamometer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following describes exemplary embodiments of the present application in conjunction with the accompanying drawings. Various details of the embodiments of the present application are included to facilitate understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, descriptions of well-known functions and structures are omitted in the following description for clarity and conciseness.

[0017] The following uses embodiments to elaborate in detail on the method for obtaining the turbine power of the present application.

[0018] Figure 1 It is a schematic flowchart of the method for obtaining the turbine power provided by the embodiments of the present application.

[0019] As Figure 1 shown, the method for obtaining the turbine power proposed in this embodiment specifically includes the following steps:

[0020] S101. Conduct a test on the test turbine under test conditions to obtain the actual measured power of the turbine measured by the dynamometer.

[0021] In the embodiments of the present application, under test conditions, the main gas is controlled to enter the test turbine, and the mechanical energy converted from the thermal energy of the main gas is transmitted to the dynamometer for power measurement to obtain the actual measured power of the turbine measured by the dynamometer. .

[0022] For example, the structure of the turbine test bench is as Figure 2 shown. Under test conditions, the main gas enters the test turbine 12 (test piece) through the main gas inlet filter 1, main gas inlet pipe 2, main gas exhaust pipe 3, main gas flow measurement device 4, heater 5, and inlet volute 11. Inside the test turbine, the flow of the main gas drives the blades to rotate, thereby driving the entire shafting to rotate. During this process, the thermal energy of the main gas is converted into the rotational mechanical energy of the shafting, and the rotational mechanical energy is transmitted to the dynamometer 20 through the shafting for power measurement to obtain the actual measured power of the turbine measured by the dynamometer. .

[0023] It should be noted that the true power of the test turbine consists of the following parts: the actual measured power of the turbine measured by the dynamometer , the frictional loss power of the bearings and the windage loss power of the turbine disk cavity , that is . Among them, the true power of the test turbine , the frictional loss power of the bearings and the windage loss power of the turbine disk cavity cannot be directly measured in the turbine test.

[0024] It should be noted that in the related art, in order to obtain the true power of the test turbine , it is necessary to conduct a mechanical loss test separately to measure the sum of the friction loss power of the bearing and the windage loss power of the turbine disk cavity . As shown in Figure 3 , the moving blades of the test turbine are replaced with flat blades to avoid the windage loss power generated by the moving blades in the mechanical loss test. Using a dynamometer as the driving mechanism, the test turbine is accelerated to the rotational speed range of the turbine test, and the driving power of the dynamometer at multiple stable rotational speeds is recorded. This driving power is used to offset the power consumption of the bearing and the power consumption of the disk cavity of the turbine test piece, and is equal to the sum of the friction loss power of the bearing and the windage loss power of the turbine disk cavity . The measured power of the turbine measured by the dynamometer is summed with the measured in the mechanical loss test, and the true power of the test turbine can be obtained .

[0025] However, there are multiple problems with the above solution: (1) It is necessary to replace the moving blades of the test turbine with flat blades, increasing the manufacturing cost; (2) It is necessary to open the cylinder of the test turbine, remove the moving blades, and replace them with flat blades, increasing the disassembly and assembly workload of the test turbine; (3) It is necessary to perform dynamic balancing and instrument reinstallation on the rotor of the test turbine after replacing the flat blades, increasing the testing workload of the test turbine; (4) It is necessary to conduct a mechanical loss test, increasing the test cycle; (5) It is necessary to use a dynamometer with a driving function, which is not applicable to a turbine test bench without an external driving mechanism, such as a large turbine test bench using a hydraulic dynamometer, and this solution cannot be implemented.

[0026] The method for obtaining the turbine power provided by this application can obtain the true power of the test turbine without replacing flat blades, without increasing the manufacturing cost, without increasing the disassembly and assembly workload of the test turbine, without increasing the testing workload of the test turbine, without additionally increasing the test content and test cycle, and without using an external driving mechanism, solving the technical problems of increased cost, extended cycle, and being limited by the function of the dynamometer in obtaining the true power of a large turbine test bench.

[0027] S102. After the test turbine completes the test, control the test turbine to enter coasting.

[0028] In an embodiment of the present application, after the test turbine completes the test, the current speed of the test turbine can be increased to a target speed, where the target speed is greater than the highest speed in the test condition and less than a preset speed threshold. The supply air volume of the main air and the absorption power of the dynamometer are reduced until the absorption power is reduced to a target value and the current speed of the test turbine is the target speed. It is determined that the test turbine meets the initial conditions for entering coasting. The bypass valve of the main air is controlled to open, and after a set duration, the supply valve of the main air is controlled to close. It is determined that both the inlet / outlet flow channels of the test turbine are connected to the atmosphere, and the pressures of the inlet / outlet flow channels are equal to the atmospheric pressure. The power consumption function of the dynamometer is controlled to close, and it is determined that the test turbine enters coasting.

[0029] For example, in response to the test turbine completing the test and fully acquiring relevant test data, the current speed of the test turbine is increased to the target speed. , to ensure the safety of the test turbine, the target speed needs to be less than the preset speed threshold. When the test turbine is stable at the target speed , the supply air volume of the main air can be gradually reduced and the absorption power of the dynamometer can be decreased until the absorption power of the dynamometer is reduced to the target value and the current speed of the test turbine is the target speed. Among them, the target value can be a value close to 0. In this case, it is determined that the test turbine meets the initial conditions for entering coasting. Then, the bypass valve of the main air is controlled to open, and after a set duration, the supply valve of the main air is controlled to close. Among them, the value range of the set duration can be [0.5s, 1s], etc. It is determined that both the inlet / outlet flow channels of the test turbine are connected to the atmosphere, and the pressures of the inlet / outlet flow channels are equal to the atmospheric pressure. The power consumption function of the dynamometer is controlled to close, and it is determined that the test turbine enters coasting. The speed continues to decrease, and the test acquisition system timely records the test data during the speed change process. After the coasting speed of the test turbine is lower than the lowest speed in the test condition, the power consumption function of the dynamometer is turned on, the speed control of the test turbine is restored, and the test shutdown process is entered.

[0030] S103. Obtain the rotor energy change rate of the test turbine during coasting, and based on computational fluid dynamics (CFD), obtain the blower power of the moving blades of the test turbine at the coasting speed.

[0031] It should be noted that during the coasting of the test turbine, the rotor energy is consumed by bearing friction loss, the disc cavity blower loss of the test turbine, and the moving blade blower loss of the test turbine. According to the principle of energy conservation, the following energy conservation equation can be obtained:

[0032]

[0033] Among them, is the rotor energy change rate, is the blower power of the moving blades, is the friction loss power of the bearing, is the power loss due to disk cavity ventilation.

[0034] In the embodiment of the present application, according to the above energy conservation equation, is the rate of change of rotor energy and the ventilation power of the moving blades The difference between them is the power loss due to bearing friction and the power loss due to turbine disk cavity ventilation The sum of them, that is .

[0035] In the embodiment of the present application, the rotor coasting curve of the test turbine during coasting can be obtained. According to the rotor coasting curve, the rate of change of rotor speed is determined. The speed and moment of inertia of the rotor of the test turbine during coasting are obtained. According to the rate of change of rotor speed, speed and moment of inertia, the rate of change of rotor energy of the test turbine during coasting is obtained.

[0036] In the embodiment of the present application, based on Computational Fluid Dynamics (CFD), the ventilation power of the moving blades of the test turbine at the coasting speed can be obtained.

[0037] S104. Determine the true power of the test turbine according to the measured power of the turbine, the rate of change of rotor energy and the ventilation power of the moving blades.

[0038] Among them, the measured power of the turbine is often lower than the true power of the test turbine.

[0039] In the embodiment of the present application, after obtaining the measured power of the turbine, the rate of change of rotor energy and the ventilation power of the moving blades, the true power of the test turbine can be determined according to the following formula :

[0040]

[0041] Among them, is the measured power of the turbine, is the rate of change of rotor energy, is the ventilation power of the moving blades.

[0042] The method for obtaining the turbine power provided by this application obtains the measured turbine power measured by a dynamometer through testing a test turbine under test conditions. After the test turbine completes the test, the test turbine is controlled to enter coasting, and the rotor energy change rate during the coasting process of the test turbine is obtained. Based on computational fluid dynamics (CFD), the blower power of the moving blades of the test turbine at the coasting speed is obtained. According to the measured turbine power, the rotor energy change rate, and the blower power of the moving blades, the true power of the test turbine is obtained. Thus, in this application, the disc cavity blower loss and the rotor bearing friction loss of the test turbine are eliminated during the test. Without increasing the manufacturing cost, the disassembly and assembly workload, and the test cycle of the test turbine, the true power of the test turbine can be obtained, and the thermal power conversion efficiency of the test turbine can be better obtained. While improving the efficiency of obtaining the true power of the test turbine, the cost of obtaining the true power of the test turbine is reduced, and there is no need to use a rotor drive device. This solution can be applied to various types of turbine test benches and has wide applicability.

[0043] Figure 4 It is a schematic flowchart of the method for obtaining the turbine power provided by the embodiments of this application.

[0044] As Figure 4 shown, the method for obtaining the turbine power proposed in this embodiment specifically includes the following steps:

[0045] S401. Test the test turbine under test conditions to obtain the measured turbine power measured by a dynamometer.

[0046] S402. After the test turbine completes the test, control the test turbine to enter coasting.

[0047] Regarding steps S401 - S402, any implementation method in the embodiments of this application can be used, and details are not described here again.

[0048] S403. Obtain the rotor coasting curve of the test turbine during the coasting process, and determine the rotor speed change rate according to the rotor coasting curve.

[0049] In the embodiments of this application, the rotor coasting curve of the test turbine during the coasting process can be directly measured , and the first derivative with respect to time is taken to obtain the rotor speed change rate .

[0050] S404. Obtain the rotor coasting speed and the rotor moment of inertia of the test turbine during the coasting process.

[0051] S405. Obtain the rotor energy change rate of the test turbine during the coasting process according to the rotor speed change rate, the rotor coasting speed, and the rotor moment of inertia.

[0052] In an embodiment of the present application, after obtaining the rotor speed change rate , the rotor coast-down speed and the rotor moment of inertia , the rotor energy change rate during the coast-down process of the test turbine is .

[0053] S406. Based on computational fluid dynamics (CFD), obtain the blower power of the moving blades of the test turbine at the coast-down speed.

[0054] In an embodiment of the present application, parameters during the CFD calculation of the blade flow passage of the test turbine can be obtained. Among them, the parameters at least include the structured grid corresponding to the blade flow passage of the test turbine, the target turbulence model, the numerical solver, and the target boundary conditions. According to the parameters, calculate the blower power of the moving blades of the test turbine at the coast-down speed to obtain the blower power of the moving blades of the test turbine at the coast-down speed.

[0055] For example, the blade flow passage of the test turbine can be used as the calculation object. From the inlet of the first row of blades to the outlet of the last row of blades of the test turbine, a structured grid is generated using the structured grid generation tool of the CFD software. Using the steady-state calculation function of the three-dimensional viscous compressible fluid of the CFD software, the target turbulence model can adopt the (Spalart-Allmaras, abbreviated as S-A) model or the (Shear Stress Transport, abbreviated as SST) model suitable for the flow field analysis of turbomachinery. The boundary conditions at least include: the total temperature at the inlet boundary adopts the atmospheric normal temperature, the total pressure at the inlet boundary adopts the atmospheric pressure, the average static pressure at the outlet boundary adopts the atmospheric pressure, the rotational speed is set to the rotational speed value corresponding to the turbine test condition, each calculation example corresponds to a rotational speed, and the remaining boundary conditions are the same as the conventional settings. According to the parameters, calculate the blower power of the moving blades of the test turbine at the coast-down speed to obtain the blower power of the moving blades of the test turbine at the coast-down speed.

[0056] S407. Obtain the difference between the rotor energy change rate and the blower power of the moving blades.

[0057] S408. Obtain the sum value between the measured power of the turbine and the difference, and use the sum value as the true power of the test turbine.

[0058] In an embodiment of the present application, the true power of the test turbine can be determined by the following formula:

[0059]

[0060] Where, is the measured power of the turbine, is the rotor energy change rate, is the blower power of the moving blade.

[0061] In the embodiment of the present application, according to the above formula, for different rotational speeds in the test conditions of the test turbine , by obtaining , and , the true power of the test turbine can be obtained .

[0062] In summary, the method for obtaining the turbine power provided by the present application conducts tests on the test turbine under test conditions to obtain the measured power of the turbine measured by the dynamometer. After the test turbine completes the test, it controls the test turbine to enter coasting, obtains the coasting curve of the rotor during the coasting of the test turbine, determines the rotor speed change rate according to the coasting curve of the rotor, obtains the coasting speed and the rotor moment of inertia of the rotor during the coasting of the test turbine, obtains the rotor energy change rate of the test turbine during the coasting according to the rotor speed change rate, the coasting speed of the rotor and the rotor moment of inertia, obtains the rotor energy change rate of the test turbine during the coasting, based on computational fluid dynamics CFD, obtains the blower power of the moving blade at the coasting speed of the test turbine, obtains the difference between the rotor energy change rate and the blower power of the moving blade, obtains the sum value between the power and the difference, and takes the sum value as the true power of the test turbine. Thus, the present application can obtain the true power of the test turbine according to the measured power of the turbine, the rotor energy change rate and the blower power of the moving blade without replacing the flat blade, without increasing the manufacturing cost, without increasing the disassembly and assembly workload of the test turbine, without increasing the test workload of the test turbine, without additionally increasing the test content and test cycle, and without using an external drive mechanism, improving the efficiency of obtaining the true power of the test turbine while reducing the cost of obtaining the true power of the test turbine, and solving the technical problems of increased cost, extended cycle, and being limited by the function of the dynamometer for obtaining the true power of a large turbine test bench.

[0063] To implement the above embodiment, this embodiment provides a device for obtaining turbine power. Figure 5 is a schematic structural diagram of a device for obtaining turbine power provided by an embodiment of the present application.

[0064] As Figure 5 shown, the device 1000 for obtaining turbine power includes: a first obtaining module 110, a control module 120, a second obtaining module 130, and a determining module 140.

[0065] The first obtaining module 110 is configured to conduct tests on the test turbine under test conditions to obtain the measured power of the turbine measured by the dynamometer.

[0066] The control module 120 is configured to control the test turbine to enter coasting after the test turbine completes the test.

[0067] A second acquisition module 130, configured to acquire the rotor energy change rate of the test turbine during the coasting process, and based on computational fluid dynamics (CFD), acquire the blower power of the moving blades of the test turbine at the coasting speed.

[0068] A determination module 140, configured to acquire the true power of the test turbine according to the measured power of the turbine, the rotor energy change rate, and the blower power of the moving blades.

[0069] In one embodiment of the present application, the first acquisition module 110 is further configured to: control the main gas to enter the test turbine under test conditions, transfer the mechanical energy converted from the thermal energy of the main gas to the dynamometer for power measurement, so as to acquire the measured power of the turbine measured by the dynamometer.

[0070] In one embodiment of the present application, the process of controlling the test turbine to enter the coasting process includes: increasing the current speed of the test turbine to a target speed, where the target speed is greater than the highest speed in the test conditions and less than a preset speed threshold; reducing the supply air volume of the main gas and the absorption power of the dynamometer until the absorption power is reduced to a target value and the current speed of the test turbine is the target speed, determining that the test turbine meets the initial conditions for entering the coasting process; controlling the bypass valve of the main gas to open, and after a set time, controlling the supply valve of the main gas to close, determining that the inlet / outlet flow channels of the test turbine are both in communication with the atmosphere, and the pressures of the inlet / outlet flow channels are both equal to the atmospheric pressure, and controlling the power consumption function of the dynamometer to close, determining that the test turbine enters the coasting process.

[0071] In one embodiment of the present application, the second acquisition module 130 is further configured to: acquire the rotor coasting curve of the test turbine during the coasting process, and determine the rotor speed change rate according to the rotor coasting curve; acquire the rotor coasting speed and the rotor moment of inertia of the test turbine during the coasting process; and acquire the rotor energy change rate of the test turbine during the coasting process according to the rotor speed change rate, the rotor coasting speed, and the rotor moment of inertia.

[0072] In one embodiment of the present application, the second acquisition module 130 is further configured to: acquire the parameters of the blade flow channel of the test turbine during the CFD calculation process, where the parameters at least include the structured grid corresponding to the blade flow channel of the test turbine, the target turbulence model, the numerical solver, and the target boundary conditions; and calculate the blower power of the moving blades of the test turbine at the coasting speed according to the parameters, so as to acquire the blower power of the moving blades of the test turbine at the coasting speed.

[0073] In one embodiment of the present application, the determination module 140 is further configured to: obtain the difference between the rotor energy change rate and the dynamic blade blowing power; obtain the sum value between the measured power of the turbine and the difference value, and use the sum value as the true power of the test turbine.

[0074] The device for obtaining the turbine power provided by the present application conducts tests on the test turbine under test conditions to obtain the measured power of the turbine measured by the dynamometer. After the test turbine completes the test, it controls the test turbine to enter coasting, obtains the rotor energy change rate during the coasting process of the test turbine, and based on computational fluid dynamics (CFD), obtains the dynamic blade blowing power of the test turbine at the coasting speed. According to the measured power of the turbine, the rotor energy change rate, and the dynamic blade blowing power, the true power of the test turbine is obtained. Thus, the present application eliminates the disk cavity blowing loss and rotor bearing friction loss of the test turbine in the test. Without increasing the manufacturing cost, disassembly and assembly workload, and test cycle of the test turbine, the true power of the test turbine can be obtained, the thermal power conversion efficiency of the test turbine can be better obtained, the efficiency of obtaining the true power of the test turbine is improved, and the cost of obtaining the true power of the test turbine is reduced. Moreover, there is no need to use a rotor drive device, and this solution can be applied to various types of turbine test benches, having wide applicability.

[0075] It should be understood that various forms of the processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in the present application can be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in the present application can be achieved, and no limitations are imposed herein.

[0076] The above specific embodiments do not constitute a limitation to the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub - combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present application should be included within the protection scope of the present application.

Claims

1. A method for obtaining turbine power, characterized in that, The method includes: Testing a test turbine under test conditions to obtain the measured power of the turbine measured by a dynamometer; After the test turbine completes the test, controlling the test turbine to enter coasting; Obtaining the rotor energy change rate of the test turbine during coasting, and based on computational fluid dynamics (CFD), obtaining the blower power of the moving blades of the test turbine at the coasting speed; Obtaining the true power of the test turbine according to the measured power of the turbine, the rotor energy change rate, and the blower power of the moving blades; The obtaining the true power of the test turbine according to the measured power of the turbine, the rotor energy change rate, and the blower power of the moving blades includes: Obtaining the difference between the rotor energy change rate and the blower power of the moving blades; Obtaining the sum value between the measured power of the turbine and the difference, and taking the sum value as the true power of the test turbine.

2. The method according to claim 1, characterized in that, The testing a test turbine under test conditions to obtain the measured power of the turbine measured by a dynamometer includes: Controlling the main gas to enter the test turbine under test conditions, and transferring the mechanical energy converted from the thermal energy of the main gas to the dynamometer for power measurement to obtain the measured power of the turbine measured by the dynamometer.

3. The method according to claim 1, wherein The process of controlling the test turbine to enter coasting includes: Increasing the current speed of the test turbine to a target speed, where the target speed is greater than the highest speed in the test conditions and less than a preset speed threshold; Reducing the supply air volume of the main gas and the absorption power of the dynamometer until the absorption power is reduced to a target value and the current speed of the test turbine is the target speed, and determining that the test turbine meets the initial conditions for entering coasting; Controlling the bypass valve of the main gas to open, and after a set time, controlling the supply valve of the main gas to close, determining that the inlet / outlet flow channels of the test turbine are both connected to the atmosphere, and the pressures of the inlet / outlet flow channels are both equal to the atmospheric pressure, and controlling the power consumption function of the dynamometer to close, determining that the test turbine enters coasting.

4. The method according to claim 1, characterized in that, The obtaining the rotor energy change rate of the test turbine during coasting includes: Obtaining the rotor coasting curve of the test turbine during coasting, and determining the rotor speed change rate according to the rotor coasting curve; Obtaining the rotor coasting speed and the rotor moment of inertia of the test turbine during coasting; Obtaining the rotor energy change rate of the test turbine during coasting according to the rotor speed change rate, the rotor coasting speed, and the rotor moment of inertia.

5. The method according to claim 1, wherein The obtaining the blower power of the moving blades of the test turbine at the coasting speed based on computational fluid dynamics (CFD) includes: Obtaining the parameters of the blade flow channel of the test turbine during CFD calculation, where the parameters at least include the structured grid corresponding to the blade flow channel of the test turbine, the target turbulence model, the numerical solver, and the target boundary conditions; Calculating the blower power of the moving blades of the test turbine at the coasting speed according to the parameters to obtain the blower power of the moving blades of the test turbine at the coasting speed.

6. A device for obtaining turbine power, characterized in that, The device includes: A first acquisition module, configured to perform a test on a test turbine under test conditions and acquire the actual measured power of the turbine measured by a dynamometer; A control module, configured to control the test turbine to enter coasting after the test of the test turbine is completed; A second acquisition module, configured to acquire the rotor energy change rate of the test turbine during coasting and acquire the blower power of the moving blades of the test turbine at the coasting speed based on computational fluid dynamics (CFD); A determination module, configured to acquire the true power of the test turbine according to the actual measured power of the turbine, the rotor energy change rate and the blower power of the moving blades; The determination module is further configured to acquire the difference between the rotor energy change rate and the blower power of the moving blades; acquire the sum value between the actual measured power of the turbine and the difference value, and use the sum value as the true power of the test turbine.

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