Visualization system for erosion and temperature of last-stage blade of steam turbine under working condition of deep peak regulation

Abstract

The invention relates to the technical field of steam turbines, in particular to a steam turbine last-stage blade erosion and temperature visualization system under a deep peak regulation working condition, which comprises a water vapor two-phase working medium and an atomized liquid drop tracer particle module used for acquiring a movement track of atomized liquid drops of a blade grid finite volume grid module; and the atomized liquid drop erosion module is used for obtaining the erosion area and degree of the atomized liquid drops of the blade grid finite volume grid module impacting the blades. The visualization module is used for displaying the movement track of the atomized liquid drops and the area and degree of erosion generated when the atomized liquid drops impact the blades; according to the invention, through the water vapor two-phase working medium and atomized droplet tracer particle module, the atomized droplet erosion module and the visualization module, visualization of a motion track of atomized droplets and an area and degree of erosion generated by impact of the atomized droplets on blades is realized; therefore, the problem that the erosion and temperature of the low-pressure last-stage blade of the steam turbine cannot be predicted under deep peak regulation is solved.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a visualization system for erosion and temperature of last-stage blades of a steam turbine under deep peak regulation conditions. Background Art

[0002] In order to improve the heating capacity and peak-shaving capacity of the unit, and to enable the heating unit to flexibly switch between the extraction condensing operation mode and the high back pressure operation mode, the unit has the characteristics of large heating capacity of the high back pressure unit and flexible operation mode of the extraction condensing heating unit.

[0003] The low-pressure cylinder zero-output heating technology is adopted, and most of the exhaust gas from the intermediate-pressure cylinder is used for heating, while a very small amount of exhaust gas enters the low-pressure cylinder to take away the heat of the low-pressure blade blast. However, when the steam turbine is running under low-flow conditions, the steam intake of the low-pressure cylinder is very small, and the low-pressure rotor is running under extremely small volume flow conditions, which may cause dynamic stress risks and serious final-stage blast problems.

[0004] In order to solve the problem of excessively high exhaust temperature of the low-pressure cylinder caused by air blast, water spraying of the low-pressure cylinder is required for a long time in actual operation. However, water spraying of the low-pressure cylinder to reduce the temperature will cause water erosion of the last-stage blades. Therefore, the erosion and temperature of the last-stage blades are accurately predicted, so that corresponding measures can be prepared in advance to protect the last-stage blades to ensure safe and stable operation of the turbine. Summary of the invention

[0005] The purpose of the present invention is to provide a visualization system for the erosion and temperature of the last stage blades of a steam turbine under deep peak regulation conditions, aiming to solve the problem that the erosion and temperature of the low-pressure last stage blades of a steam turbine under deep peak regulation are unpredictable.

[0006] To achieve the above-mentioned object, the present invention provides a visualization system for the erosion and temperature of the last-stage blades of a steam turbine under deep peak-shaving conditions, comprising a steam turbine low-pressure blade model and a finite volume grid module, a water vapor two-phase working medium and atomized droplet tracer particle module, an atomized droplet erosion module and a visualization module, wherein the water vapor two-phase working medium and atomized droplet tracer particle module and the atomized droplet erosion module are respectively connected to the visualization module, and are respectively connected to the steam turbine low-pressure blade model and the finite volume grid module;

[0007] The steam turbine low-pressure blade model and the finite volume grid module are used to establish a cascade finite volume grid module;

[0008] The water vapor two-phase working medium and atomized droplet tracer particle module is used to obtain the motion trajectory of the atomized droplets of the blade finite volume grid module;

[0009] The atomized droplet erosion module is used to obtain the area and degree of erosion caused by the atomized droplets hitting the blades of the cascade finite volume grid module;

[0010] The visualization module is used to display the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades.

[0011] Wherein, the cascade finite volume grid module includes a cascade channel and five-stage blades.

[0012] Wherein, the five-stage blades include a plurality of moving blades and a plurality of stationary blades, and the plurality of moving blades and the plurality of stationary blades are arranged adjacent to each other.

[0013] There are a plurality of nozzles in the blade channel, and the plurality of nozzles are respectively arranged upstream and downstream of the outer edge guide ring and upstream and downstream of the inner edge guide ring, and the nozzles are used to spray water to cool the five-stage blades.

[0014] The atomized droplet erosion module is established based on the impact velocity of the atomized droplets and the impact angle of the droplets.

[0015] The water vapor two-phase working fluid and atomized droplet tracer particle module calculates the motion trajectory of the atomized droplets based on the tracer particle model of the Euler-Lagrangian particle tracking method.

[0016] Wherein, the visualization module comprises a data collection unit, a data conversion unit, an evaluation unit and a display unit, the data collection unit, the data conversion unit and the display unit are connected in sequence, and the evaluation unit is connected to the data conversion unit and the display unit respectively;

[0017] The data collection unit is used to collect the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades;

[0018] The data conversion unit is used to convert the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades;

[0019] The evaluation unit evaluates the motion trajectory of the converted atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades based on a preset threshold value to obtain an evaluation result;

[0020] The display unit is used to display the movement trajectory of the atomized droplets, the area and degree of erosion caused by the atomized droplets hitting the blades, and the evaluation results.

[0021] The visualization system of the erosion and temperature of the last-stage blades of a steam turbine under deep peak-shaving conditions of the present invention comprises a steam turbine low-pressure blade model and a finite volume grid module, a water-steam two-phase working medium and atomized droplet tracer particle module, an atomized droplet erosion module and a visualization module, wherein the steam turbine low-pressure blade model and the finite volume grid module are used to establish a blade grid finite volume grid module; the water-steam two-phase working medium and atomized droplet tracer particle module are used to obtain the motion trajectory of the atomized droplets of the blade grid finite volume grid module; the atomized droplet erosion module is used to obtain the area and degree of erosion caused by the atomized droplets of the blade grid finite volume grid module impacting the blades. The visualization module is used to display the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades. The present invention realizes visualization of the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades through the water vapor two-phase working medium and the atomized droplet tracer particle module, the atomized droplet erosion module and the visualization module, thereby solving the problem of unpredictable erosion and temperature of the low-pressure last-stage blades of the turbine under deep peak regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 The present invention provides a visualization system for the erosion and temperature of the last-stage blades of a steam turbine under deep peak regulation conditions.

[0024] Figure 2 It is a schematic diagram of a single-channel three-dimensional model of the low-pressure cylinder flow area;

[0025] Figure 3 It is a schematic diagram of the three-dimensional model of the full-circle channel in the low-pressure cylinder flow area;

[0026] Figure 4 It is a schematic diagram of the water spraying position and direction;

[0027] Figure 5 It is a schematic diagram of the finite volume grid of the flow area of ​​the low-pressure cylinder;

[0028] Figure 6 Schematic diagram of steam streamlines in the last-stage meridian channel under different water spraying modes: nozzle 6(a) is arranged upstream of the outer edge guide ring, nozzle 6(b) is arranged downstream of the outer edge guide ring, nozzle 6(c) is arranged upstream of the inner edge guide ring, and nozzle 6(d) is arranged downstream of the inner edge guide ring;

[0029] Figure 7 Schematic diagram of temperature distribution of the last three-stage meridian channel under different water spraying modes: 7(a) nozzle is arranged upstream of the outer edge guide ring, 7(b) nozzle is arranged downstream of the outer edge guide ring, 7(c) nozzle is arranged upstream of the inner edge guide ring, and 7(d) nozzle is arranged downstream of the inner edge guide ring;

[0030] Figure 8 Schematic diagram of temperature distribution of the stationary blade suction surface (SS), moving blade pressure surface (RP), moving blade suction surface (RS) and stationary blade pressure surface (SP) of the last-stage blade under different water spraying modes. 8(a) The nozzle is arranged upstream of the outer edge guide ring, 8(b) The nozzle is arranged downstream of the outer edge guide ring, 8(c) The nozzle is arranged upstream of the inner edge guide ring, and 8(d) The nozzle is arranged downstream of the inner edge guide ring.

[0031] Fig. 9 It is a schematic diagram of the degree of erosion of the nozzle atomized droplets on the static blade suction surface (SS), the moving blade pressure surface (RP), the moving blade suction surface (RS) and the static blade pressure surface (SP) of the last stage blade.

[0032] Fig.10 Schematic diagram of the motion trajectory of water atomized droplets under different water spraying modes. The nozzle 10(a) is arranged upstream of the outer edge guide ring, the nozzle 10(b) is arranged downstream of the outer edge guide ring, the nozzle 10(c) is arranged upstream of the inner edge guide ring, and the nozzle 10(d) is arranged downstream of the inner edge guide ring.

[0033] Fig.11 This is a schematic diagram of the visualization module.

[0034] In the figure: 1-steam turbine low-pressure blade model and finite volume grid module, 2-water steam two-phase working fluid and atomized droplet tracer particle module, 3-atomized droplet erosion module, 4-visualization module, 41-data collection unit, 42-data conversion unit, 43-evaluation unit, 44-display unit, 5-blade channel, 51-nozzle, 6-five-stage blade, 61-moving blade, 62-stationary blade. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] See also Figures 1 to 11The present invention provides a visualization system for the erosion and temperature of the last-stage blades of a steam turbine under deep peak-shaving conditions, comprising a steam turbine low-pressure blade model and a finite volume grid module 1, a water vapor two-phase working medium and atomized droplet tracer particle module 2, an atomized droplet erosion module 3 and a visualization module 4, wherein the water vapor two-phase working medium and atomized droplet tracer particle module 2 and the atomized droplet erosion module 3 are respectively connected to the visualization module 4, and are respectively connected to the steam turbine low-pressure blade model and the finite volume grid module 1;

[0037] The steam turbine low-pressure blade model and the finite volume grid module 1 are used to establish a cascade finite volume grid module;

[0038] The water vapor two-phase working medium and atomized droplet tracer particle module 2 is used to obtain the motion trajectory of the atomized droplets of the blade finite volume grid module;

[0039] The atomized droplet erosion module 3 is used to obtain the area and degree of erosion caused by the atomized droplets hitting the blades of the cascade finite volume grid module;

[0040] The visualization module 4 is used to display the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades.

[0041] In this embodiment, the steam turbine low-pressure blade model and the finite volume grid module 1 are used to establish a blade grid finite volume grid module; the water vapor two-phase working medium and atomized droplet tracer particle module 2 are used to obtain the motion trajectory of the atomized droplets of the blade grid finite volume grid module; the atomized droplet erosion module 3 is used to obtain the area and degree of erosion caused by the atomized droplets hitting the blades of the blade grid finite volume grid module. The visualization module 4 is used to display the motion trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades. The present invention realizes the visualization of the motion trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades through the water vapor two-phase working medium and atomized droplet tracer particle module 2, the atomized droplet erosion module 3 and the visualization module 4, thereby solving the problem of unpredictable erosion and temperature of the low-pressure last stage blades of the steam turbine under deep peak regulation.

[0042] Furthermore, the cascade finite volume grid module includes a cascade channel 5 and a five-stage blade 6 .

[0043] The five-stage blade 6 includes a plurality of moving blades 61 and a plurality of stationary blades 62 , and the plurality of moving blades 61 and the plurality of stationary blades 62 are arranged adjacent to each other.

[0044] The blade channel 5 has a plurality of nozzles 51 , which are respectively arranged upstream and downstream of the outer edge guide ring and upstream and downstream of the inner edge guide ring. The nozzles 51 are used to spray water to cool the fifth-stage blades 6 .

[0045] In this embodiment, the steam turbine low-pressure blade model and the finite volume grid module 1 include a cascade channel 5 and a five-stage blade 6, each stage of the blade includes a moving blade 61 and a stationary blade 62, and a nozzle 51 for spraying water for cooling is provided in the last stage cascade channel 5. The nozzles 51 are respectively arranged upstream of the outer edge guide ring, downstream of the outer edge guide ring, upstream of the inner edge guide ring, and downstream of the inner edge guide ring.

[0046] Furthermore, the atomized droplet erosion module 3 is established based on the impact velocity of the atomized droplets and the impact angle of the droplets.

[0047] In this embodiment, the erosion of the blade due to the droplet is a complex function of the droplet impact, the droplet and the wall properties. The Finnie erosion model defines the erosion rate as a function of the kinetic energy of the droplet impacting the wall, expressed as:

[0048]

[0049] in:

[0050] The coefficient k is adjusted in the calculation to obtain the dimensionless erosion factor:

[0051]

[0052] In the formula

[0053] Furthermore, the water vapor two-phase working medium and atomized droplet tracer particle module 2 calculates the motion trajectory of the atomized droplets based on the tracer particle model of the Euler-Lagrangian particle tracking method.

[0054] In this embodiment, during the process of spraying water to cool the last stage cascade channel 5 of the steam turbine, water vapor is atomized into droplets. The cascade channel 5 contains a multi-component working fluid, which includes a discrete phase and a continuous phase. Therefore, the Euler-Lagrangian particle tracking method is used, and the water vapor is set as the continuous phase and the atomized droplets are set as the dispersed phase.

[0055] The mass conservation equation for the continuous phase is:

[0056]

[0057] Where ρ and U are the density and velocity of the mixed steam, and SM represents the source term for mass transfer from the discrete phase to the continuous phase.

[0058] The momentum equation is:

[0059]

[0060] The Reynolds average energy equation is:

[0061]

[0062] where htot is the total enthalpy, p is the static pressure, λ is the thermal conductivity, and SE represents the source term for energy transfer between the discrete phase and the continuous phase.

[0063] The motion equation of the dispersed phase of the atomized droplets is:

[0064]

[0065] Where mp is the mass of the droplet particle, Up is the droplet velocity, FD is the drag force of the surrounding water vapor on the droplet, FB is the buoyancy force generated by the gravity of the droplet, FR is the force generated by rotation, and FVM is the virtual mass force.

[0066] For the water vapor two-phase model, the saturation pressure can be estimated by the Antoine equation:

[0067]

[0068] Where pscale is the pressure scale, coefficient A is 11.779, coefficient B is 3885.704, and coefficient C is 230.23K.

[0069] The model uses two mass transfer correlations depending on whether the droplet is above or below the boiling point. The mass transfer equation at the boiling point is:

[0070]

[0071] Where V is the latent heat of vaporization of the droplet, QC and QR are convective heat transfer and radiation heat transfer.

[0072]

[0073] Where dp is the droplet diameter. ρD is the diffusivity of the continuous phase, Sh is the Sherwood number. WC and WG are the molecular weights of the working water vapor and the water vapor evaporated from the droplets, XsV is the equilibrium vapor mole fraction of the evaporating component on the droplet surface, and XvapV is the mole fraction of the vapor evaporated from the droplets.

[0074] The mass source term is:

[0075]

[0076] The evaporation rate is:

[0077]

[0078] Further, the visualization module 4 includes a data collection unit 41, a data conversion unit 42, an evaluation unit 43 and a display unit 44, the data collection unit 41, the data conversion unit 42 and the display unit 44 are connected in sequence, and the evaluation unit 43 is connected to the data conversion unit 42 and the display unit 44 respectively;

[0079] The data collection unit 41 is used to collect the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades;

[0080] The data conversion unit 42 is used to convert the data of the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades;

[0081] The evaluation unit 43 evaluates the motion trajectory of the converted atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades based on a preset threshold value to obtain an evaluation result;

[0082] The display unit 44 is used to display the movement trajectory of the atomized droplets, the area and degree of erosion caused by the atomized droplets hitting the blades, and the evaluation results.

[0083] In this embodiment, the data collection unit 41 collects the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades, the data conversion unit 42 performs data conversion on the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades, the evaluation unit 43 evaluates the converted movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades based on a preset threshold to obtain an evaluation result, and the display unit 44 displays the movement trajectory of the atomized droplets, the area and degree of erosion caused by the atomized droplets hitting the blades and the evaluation result.

[0084] Figure 2 The single-channel 3D model of the low-pressure cylinder flow area is shown. Figure 3 The 3D model of the full-circle channel of the low-pressure cylinder flow area is displayed. The cascade channel and the last five blades are established. Each blade stage includes moving blades and stationary blades. In addition, a nozzle for water spray cooling is arranged in the last blade cascade channel. Figure 4 The water spraying position and direction are shown, and the nozzles are arranged upstream of the outer edge guide ring, downstream of the outer edge guide ring, upstream of the inner edge guide ring, and downstream of the inner edge guide ring. Figure 5The finite volume grid established for the calculation area of ​​the low-pressure blade of the steam turbine is shown, so as to calculate the atomized droplet tracer particle model and the last stage blade erosion model. The Finnie erosion model is used to quantitatively evaluate the erosion effect of atomized droplets on the last stage blade. Figures 6 to 10 As shown, the flow field and temperature of the cascade channel, the temperature and erosion degree of the last-stage blades, and the trajectory of the atomized droplets are visualized using the erosion and temperature visualization system.

[0085] Figure 6 The steam streamlines of the last two-stage meridian passage under different water spraying modes are given. The nozzle 6(a) is arranged upstream of the outer edge guide ring, the nozzle 6(b) is arranged downstream of the outer edge guide ring, the nozzle 6(c) is arranged upstream of the inner edge guide ring, and the nozzle 6(d) is arranged downstream of the inner edge guide ring. It can be seen that obvious vortices are generated downstream of the last-stage blades, and the vortices generated are more obvious when the nozzle is arranged at the inner edge guide ring.

[0086] Figure 7 The temperature distribution of the last three-stage meridian channel under different water spraying modes is given. The nozzle 7(a) is arranged upstream of the outer edge guide ring, the nozzle 7(b) is arranged downstream of the outer edge guide ring, the nozzle 7(c) is arranged upstream of the inner edge guide ring, and the nozzle 7(d) is arranged downstream of the inner edge guide ring. It can be seen that the flow field at the top of the last stage moving blade produces a relatively high temperature. When the nozzle is arranged upstream of the outer edge guide ring, the high temperature area of ​​the flow field at the top of the moving blade is relatively small. When the nozzle is arranged at the inner edge guide ring, the temperature of the flow field at the root of the moving blade is relatively low.

[0087] Figure 8 The temperature distribution of the suction surface (SS) of the last blade, the pressure surface (RP) of the moving blade, the suction surface (RS) of the moving blade, and the pressure surface (SP) of the stationary blade under different water spraying modes is given. The nozzle 8 (a) is arranged upstream of the outer edge guide ring, the nozzle 8 (b) is arranged downstream of the outer edge guide ring, the nozzle 8 (c) is arranged upstream of the inner edge guide ring, and the nozzle 8 (d) is arranged downstream of the inner edge guide ring. It can be seen that higher temperatures appear on the pressure surface and suction surface of the moving blade top, while the temperatures of the pressure surface and suction surface of the stationary blade are relatively low.

[0088] Fig. 9 The erosion degree of the nozzle atomized droplets on the suction surface (SS) of the last blade, the pressure surface (RP) of the moving blade, the suction surface (RS) of the moving blade, and the pressure surface (SP) of the stationary blade is given. It can be seen that the moving blade is more eroded by the atomized droplets, and the top surface of the moving blade is more eroded.

[0089] Fig.10The motion trajectories of the atomized droplets under different water spraying modes are given. The nozzle 10(a) is arranged upstream of the outer guide ring, the nozzle 10(b) is arranged downstream of the outer guide ring, the nozzle 10(c) is arranged upstream of the inner guide ring, and the nozzle 10(d) is arranged downstream of the inner guide ring. It can be seen that the atomized droplets impact the last-stage blades, causing erosion to the last-stage blades.

[0090] What is disclosed above is only a preferred embodiment of the visualization system of the erosion and temperature of the last stage blades of the steam turbine under deep peak regulation conditions of the present invention. Of course, this cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of the present invention are still within the scope of the invention.

Claims

1. Visualization system for erosion and temperature of last stage blades of steam turbine under deep peak load conditions, characterized by: It includes a steam turbine low-pressure blade model and a finite volume grid module, a water vapor two-phase working medium and atomized droplet tracer particle module, an atomized droplet erosion module and a visualization module, wherein the water vapor two-phase working medium and atomized droplet tracer particle module and the atomized droplet erosion module are respectively connected to the visualization module, and are respectively connected to the steam turbine low-pressure blade model and the finite volume grid module; The steam turbine low-pressure blade model and the finite volume grid module are used to establish a cascade finite volume grid module; The water vapor two-phase working medium and atomized droplet tracer particle module is used to obtain the motion trajectory of the atomized droplets of the blade finite volume grid module; The atomized droplet erosion module is used to obtain the area and degree of erosion caused by the atomized droplets hitting the blades of the cascade finite volume grid module; The visualization module is used to display the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades.

2. The visualization system for the erosion and temperature of the last stage blades of the steam turbine under the deep peak load condition according to claim 1, characterized in that: The cascade finite volume grid module includes a cascade channel and five-stage blades.

3. The visualization system for the erosion and temperature of the last stage blades of the steam turbine under the deep peak load condition according to claim 2, characterized in that: The five-stage blades include a plurality of moving blades and a plurality of stationary blades, and the plurality of moving blades and the plurality of stationary blades are arranged adjacent to each other.

4. The visualization system for the erosion and temperature of the last stage blades of the steam turbine under the deep peak load condition according to claim 2, characterized in that: The blade cascade channel is provided with a plurality of nozzles, which are respectively arranged upstream and downstream of the outer edge guide ring and upstream and downstream of the inner edge guide ring, and the nozzles are used to spray water to cool the five-stage blades.

5. The visualization system for the erosion and temperature of the last stage blades of the steam turbine under the deep peak load condition according to claim 1, characterized in that: The atomized droplet erosion module is established based on the impact velocity of the atomized droplet and the impact angle of the droplet.

6. The visualization system for the erosion and temperature of the last stage blades of the steam turbine under the deep peak load condition according to claim 1, characterized in that: The water vapor two-phase working medium and atomized droplet tracer particle module calculates the motion trajectory of the atomized droplets based on the tracer particle model of the Euler-Lagrangian particle tracking method.

7. The visualization system for the erosion and temperature of the last stage blades of a steam turbine under deep peak load conditions according to claim 1, characterized in that: The visualization module includes a data collection unit, a data conversion unit, an evaluation unit and a display unit, wherein the data collection unit, the data conversion unit and the display unit are connected in sequence, and the evaluation unit is connected to the data conversion unit and the display unit respectively; The data collection unit is used to collect the movement trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades; The data conversion unit is used to convert the moving trajectory of the atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades; The evaluation unit evaluates the motion trajectory of the converted atomized droplets and the area and degree of erosion caused by the atomized droplets hitting the blades based on a preset threshold value to obtain an evaluation result; The display unit is used to display the movement trajectory of the atomized droplets, the area and degree of erosion caused by the atomized droplets hitting the blades, and the evaluation results.

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