A novel wind turbine blade icing simulation system and method

Abstract

The present invention discloses a novel fan blade icing simulation system and method, which relates to the technical field of fan blade icing simulation experiments. The system comprises a ventilation duct and a control host. A variable frequency fan is provided at the front end of the ventilation duct; an air heat exchange chamber, an atomization chamber, an instrument chamber, and a blade installation chamber are sequentially provided from the front end to the rear end of the ventilation duct; a refrigeration device is installed in the air heat exchange chamber, an atomizer is installed in the atomization chamber, and a rotating device is installed in the blade installation chamber. The present invention evenly divides the fan blade from the tip to the root into 10 small pieces to obtain fan blade blocks at different locations of the fan blade. Then, according to the on-site fan blade position and its linear velocity, the fan blade blocks are fixed to the rotating device to simulate the fan blade blocks to reach the on-site fan blade linear velocity, thereby solving the problem that the laboratory cannot simulate the on-site fan blade linear velocity and improving the effect of laboratory simulation experiments.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blade icing simulation experiments, and in particular to a novel wind turbine blade icing simulation system and method. Background Art

[0002] Wind blades have very high requirements on materials. They not only need to be light in weight, but also need to have high strength, corrosion resistance, and fatigue resistance. Wind blades are one of the core components of wind turbines, accounting for about 15%-20% of the total cost of the wind turbine. Its quality will be directly related to the performance and benefits of the wind turbine.

[0003] At present, wind turbines in low-temperature climate areas in winter (such as Henan, Hunan, Hubei, and Chongqing) generally have blade icing problems. After the blades are covered with ice, the aerodynamic performance of the blades decreases, the lift decreases, the torque decreases, and the power generation performance deteriorates. In severe cases, the wind turbine stops operating, which has a negative impact on the operating income of the wind power project. In addition, there are a series of problems such as vibration caused by unbalanced blade icing and harm to personnel and facilities caused by deicing. Among them, the loss of power generation in wind farms is more prominent. It is urgent to solve the problem of wind turbine blade icing. Among them, the wind turbine blade icing simulation test is a key prerequisite for solving the problem of wind turbine blade icing. Summary of the Invention

[0004] The purpose of the present invention is to provide a novel wind turbine blade icing simulation system and method to address the above-mentioned deficiencies in the prior art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a novel fan blade icing simulation system, comprising a ventilation duct and a control host, wherein a variable frequency fan is provided at the front end of the ventilation duct; an air heat exchange chamber, a mist chamber, an instrument chamber, and a blade installation chamber are sequentially provided from the front end to the rear end of the ventilation duct; a refrigeration device is installed in the air heat exchange chamber, an atomizer is installed in the mist chamber, and a monitoring instrument assembly is installed in the instrument chamber; a rotating device is installed in the blade installation chamber, the rotating device is used to install the fan blade block and drive it to rotate, and the blade installation chamber is also provided with a spray mechanism;

[0006] The control host is interactively and electrically connected to the variable frequency fan, refrigeration device, atomizer, monitoring instrument assembly, rotating equipment and spray mechanism.

[0007] As a further description of the above technical solution: the fan blade block is a fan blade block that is evenly divided into 10 small pieces from the tip to the root to obtain different area positions of the fan blade, wherein the length of the fan blade that needs to be divided is 70% of the total length of the blade.

[0008] As a further description of the above technical solution: the monitoring instrument assembly includes an anemometer, a thermometer and a hygrometer.

[0009] As a further description of the above technical solution: the spray mechanism includes a water tank and a spray head, the spray head is installed in the blade installation chamber to spray the interior thereof, a water pump is provided on one side of the water tank, and the water pump is used to extract water from the water tank and transport it to the spray head.

[0010] As a further description of the above technical solution: the rotating device includes a frame, a swivel seat is rotatably arranged on the front side of the frame, a drive motor is arranged at the rear end of the frame, and the drive motor is transmission-connected to the swivel seat through a coupling, and a fan blade block is detachably fixed to the outer side of the swivel seat through a mounting frame.

[0011] As a further description of the above technical solution: there are three mounting brackets in total, and the three mounting brackets are located outside the rotating seat and distributed in a circular manner with equal angles.

[0012] As a further description of the above technical solution: the mounting frame includes a base fixed on the outside of the swivel seat, two lateral positioning frames are symmetrically fixed on the top of the base, a connecting screw is vertically fixed on the base between the two lateral positioning frames, and the top end of the connecting screw is spirally connected to the top plate.

[0013] As a further description of the above technical solution: the sleeve of the lateral positioning frame, the inner side of the sleeve is rotatably provided with a bidirectional adjustment screw, and two nut sleeves are symmetrically sleeved on the bidirectional adjustment screw, two nut sleeves are symmetrically hinged on the two support frames, and an abutment frame is rotatably connected between the two support frames.

[0014] A novel wind turbine blade icing simulation method, based on the novel wind turbine blade icing simulation method described above, comprises the following steps:

[0015] S1: evenly divide the fan blade from the tip to the root into 10 small pieces to obtain fan blade blocks at different regions of the fan blade;

[0016] S2: Calculate the corresponding linear velocity of each fan blade block based on the on-site fan blade position and linear velocity. Then fix the fan blade block to the rotating device and adjust the rotating speed of the rotating device to simulate the fan blade block to achieve the on-site fan blade linear velocity.

[0017] S3: Start the variable frequency fan to blow air into the ventilation duct. According to the test results of the monitoring instrument components in the instrument room, adjust the frequency converter of the variable frequency fan to meet the test requirements under different wind speeds.

[0018] Start the refrigeration device and adjust the refrigeration device to meet the test requirements at different temperatures according to the test results of the monitoring instrument components in the instrument room;

[0019] Start the atomizer and atomize water vapor into the atomizer chamber to simulate foggy weather. According to the test results of the monitoring instrument components in the instrument room, adjust the inverter of the atomizer to meet the foggy weather test requirements under different humidity conditions.

[0020] Start the spray mechanism to simulate light rain weather, and control the flow of the spray mechanism to meet the test requirements under different rainfall amounts;

[0021] S4: After the experiment is completed, the fan blade block is removed from the rotating equipment, and the icing condition of the fan blade block is checked, including the icing condition of the fan blade block and the location of the icing, to draw conclusions from the simulation test. The icing condition includes whether icing occurs, the maximum thickness of icing, and the quality of icing.

[0022] S5: Repeat until all simulation tests on the divided fan blade blocks are completed

[0023] As a further description of the above technical solution: in step 2, the corresponding linear velocity of each fan blade block is calculated based on the on-site fan blade position and its linear velocity as follows:

[0024] The radius of the rotating device is 0.8m, and the rotation speed is 0-1000 rpm.

[0025] The calculation formula for the rotating equipment speed setting value z (r / min) is:

[0026]

[0027] Where n is the nth blade; Q (rev / min) is the speed of the on-site fan; L (m) is the length of the on-site fan blade.

[0028] In the above technical solution, the present invention provides a novel wind turbine blade icing simulation system and method, which has the following beneficial effects:

[0029] The novel fan blade icing simulation system and method obtains fan blade blocks in different areas of the fan blade by evenly dividing the fan blade from the tip to the root, and then calculates the corresponding linear speed of each blade by the rotation equipment speed setting value z calculation formula according to the on-site fan blade position and its linear speed, and then fixes the fan blade block to the rotating device, and simulates the fan blade block to reach the on-site fan blade linear speed by adjusting the rotation speed of the rotating device, solving the problem that the laboratory cannot simulate the on-site fan blade linear speed and improving the laboratory simulation experiment effect. Secondly, the novel fan blade icing simulation system and method realizes different wind speeds, temperatures, humidity, The simulation experiments are carried out under different weather conditions such as whether it is raining or not, so as to meet the simulation needs of various weather conditions. In addition, the simulation experiments are carried out by setting three mounting frames to synchronously fix three fan blade blocks in the same position, thereby improving the rotation stability of the rotating equipment. At the same time, it is compatible with the normal fan blade layout specifications (that is, three blades are installed on the fan), thereby improving the effect of the simulation experiment, and realizing the one-time measurement of three data for the convenience of analysis. Furthermore, when installing the fan blade block, the four positions of the fan blade block are fixed as a whole, which significantly improves the stability of the fixation and further improves the accuracy of the experiment. At the same time, the base and the top plate can seal the two ends of the fan blade block to prevent wind from entering the fan blade block during rotation, thereby further improving the accuracy of the simulation experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0031] Figure 1 A schematic diagram of a novel wind turbine blade icing simulation system provided by an embodiment of the present invention;

[0032] Figure 2 A schematic structural diagram of a rotating device provided in an embodiment of the present invention;

[0033] Figure 3 A schematic structural diagram of a mounting bracket provided in an embodiment of the present invention;

[0034] Figure 4 A schematic structural diagram of a lateral positioning frame provided in an embodiment of the present invention;

[0035] Figure 5 A schematic diagram of fan blade separation provided in an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1. Ventilation duct; 2. Variable frequency fan; 3. Air heat exchange chamber; 31. Refrigeration device; 4. Atomization chamber; 41. Atomizer; 5. Instrument chamber; 51. Anemometer; 52. Thermometer; 53. Hygrometer; 6. Blade installation chamber; 7. Rotating equipment; 71. Rack; 72. Drive motor; 73. Turntable; 74. Mounting frame; 741. Base; 742. Connecting screw; 743. Top plate; 75. Fan blade block; 76. Lateral positioning frame; 761. Sleeve; 762. Two-way adjustment screw; 763. Nut sleeve; 764. Support frame; 765. Abutment frame; 8. Spraying mechanism; 81. Water tank; 82. Water pump; 83. Sprinkler head; 9. Control host. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] Example 1:

[0040] See also Figure 1-5, an embodiment of the present invention provides a novel wind turbine blade icing simulation system, wherein the wind turbine blade icing simulation test mainly simulates the blade icing conditions under different weather conditions; the main weather variables include wind speed, temperature, humidity, and whether it rains; the blade icing conditions mainly include whether icing occurs, the maximum thickness of icing, and the quality of icing, and the icing position is observed to draw simulation test conclusions, including a ventilation duct 1 and a control host 9, a variable frequency fan 2 is provided at the front end of the ventilation duct 1; an air heat exchange chamber 3, a mist chamber 4, an instrument chamber 5 and a blade installation chamber 6 are sequentially provided from the front end to the tail end of the ventilation duct 1; a refrigeration device 31 is installed in the air heat exchange chamber 3, and the refrigeration device 31 is used to adjust the temperature of the simulation experiment; an atomizer 41 is installed in the mist chamber 4, and the atomizer 41 is used to adjust the humidity of the simulation experiment; a monitoring instrument assembly is installed in the instrument chamber 5; wherein the monitoring instrument assembly includes an anemometer 51, a thermometer 52 and a hygrometer 53, through the anemometer 51, the thermometer 52 and the humidity The meter 53 collects the speed information, temperature information and humidity information of the simulation experiment in real time. A rotating device 7 is installed in the blade installation chamber 6. The rotating device 7 is used to install the fan blade block 75 and drive it to rotate. The fan blade block 75 is driven to rotate by the rotating device 7 to simulate that the fan blade block 75 reaches the on-site fan blade linear speed. A spray mechanism 8 is also provided on the blade installation chamber 6; the spray mechanism 8 is used to spray in the blade installation chamber 6 to adjust the rainy day state of the simulation experiment. The control host 9 is interactively electrically connected with the variable frequency fan 2, the refrigeration device 31, the atomizer 41, the monitoring instrument component, the rotating device 7 and the spray mechanism 8, that is, the control host 9 is used to control the variable frequency fan 2, the refrigeration device 31, the atomizer 41, the monitoring instrument component, the rotating device 7 and the spray mechanism 8, and the anemometer 51, the thermometer 52 and the hygrometer 53 in the monitoring instrument component collect the speed information, temperature information and humidity information of the simulation experiment in real time and transmit the feedback to the control host 9.

[0041] like Figure 5 As shown, the fan blade block 75 is a fan blade block 75 obtained by evenly dividing the fan blade from the tip to the root into 10 small pieces to obtain fan blades in different areas. The length of the fan blade to be divided is 70% of the total length of the blade. The corresponding linear velocity of each blade is calculated according to the on-site fan blade position and its linear velocity, and then the fan blade block 75 is fixed to the rotating device 7. By adjusting the rotation speed of the rotating device 7, the fan blade block 75 is simulated to reach the on-site fan blade linear velocity, thereby solving the problem that the laboratory cannot simulate the on-site fan blade linear velocity and improving the laboratory simulation experiment effect.

[0042] The spray mechanism 8 includes a water tank 81 and a spray head 83. The spray head 83 is installed in the blade installation chamber 6 to spray the interior thereof. A water pump 82 is provided on one side of the water tank 81, and the water pump 82 is used to extract water from the water tank 81 and transport it to the spray head 83. The inlet of the water pump 82 is connected to the water tank 81 through a water pipe, and the outlet of the water pump 82 is connected to the spray head 83 through a water pipe. That is, the water in the water tank 81 is extracted by the water pump 82 and transported to the spray head 83. Finally, water is sprayed into the blade installation chamber 6 through the spray head 83 to simulate rainy conditions. The water pump 82 is electrically connected to the control host 9. The control host 9 is used to adjust the frequency of the water pump 82 and control the flow of the water pump 82 to achieve the simulation experiment requirements under different rainfall amounts.

[0043] Rotating device 7 includes a frame 71, with a rotating base 73 rotatably mounted on the front side of frame 71. A drive motor 72 is mounted on the rear end of frame 71 and is connected to the rotating base 73 via a coupling. A fan blade block 75 is detachably secured to the outer side of the rotating base 73 via a mounting bracket 74. Specifically, the drive motor 72 drives the rotating base 73 to rotate, which in turn drives the fan blade block 75 secured thereto to rotate, thereby simulating the fan blade block 75 to rotate at the same linear speed as a real-world fan blade.

[0044] Three mounting brackets 74 are provided, and these brackets 74 are arranged in a circular pattern with equal angles outside the rotating base 73. By providing three mounting brackets 74 to simultaneously secure three fan blade blocks 75 in the same position during the simulation experiment, the stability of the rotation of the rotating device 7 is improved. This also matches the normal fan blade layout (i.e., three blades installed on a fan), improving the effectiveness of the simulation experiment and enabling the simultaneous measurement of three data points for easier analysis.

[0045] The mounting frame 74 includes a base 741 fixed to the outside of the rotating base 73. Two lateral positioning frames 76 are symmetrically fixed to the top of the base 741. A connecting screw 742 is vertically fixed to the base 741 between the two lateral positioning frames 76, and the top of the connecting screw 742 is screwed to a top plate 743. The sleeve 761 of the lateral positioning frame 76 has a bidirectional adjustment screw 762 rotatably provided on the inner side of the sleeve 761. Two nut sleeves 763 are symmetrically sleeved on the bidirectional adjustment screw 762. The bidirectional adjustment screw 762 has threaded sections with equal pitch and opposite spiral directions at both ends. The two nut sleeves 763 are respectively sleeved on the two threaded sections. When the bidirectional adjustment screw 762 rotates, the two nut sleeves 763 can be synchronously driven to move toward or in opposite directions. Two support frames 764 are symmetrically hinged on the two nut sleeves 763, and an abutment frame 765 is rotatably connected between the two support frames 764. When the fan blade block 75 is installed, the fan blade block 75 is sleeved between the two lateral positioning frames 76, and then the top plate 743 is fixed by connecting screws 742, so that the two ends of the fan blade block 75 are abutted and fixed by the top plate 743 and the base 741. After the fixation is completed, the two-way adjustment screw rod 762 is rotated to drive the two nut sleeves 763 on it to move toward each other through the adjustment screw rod 762. The two nut sleeves 763 cooperate with the support frame 764 to drive the abutment frame 765 to abut outward to achieve abutment and fixation from the inside of the fan blade block 75, thereby achieving the overall fixation of the four positions of the fan blade block 75, significantly improving the stability of the fixation, and further improving the accuracy of the experiment. At the same time, the base 741 and the top plate 743 can seal the two ends of the fan blade block 75 to prevent wind from entering the fan blade block 75 during rotation, further improving the accuracy of the simulation experiment.

[0046] Example 2:

[0047] A novel wind turbine blade icing simulation method, based on the novel wind turbine blade icing simulation method described above, comprises the following steps:

[0048] S1: evenly dividing the fan blade from the tip to the root into 10 small pieces to obtain fan blade blocks 75 at different regions of the fan blade;

[0049] S2: Calculate the corresponding linear velocity of each fan blade block 75 based on the on-site fan blade position and linear velocity, then fix the fan blade block 75 to the rotating device 7, and adjust the rotation speed of the rotating device 7 to simulate the fan blade block 75 to reach the on-site fan blade linear velocity;

[0050] S3: Start the variable frequency fan 2 to blow air into the ventilation duct 1. According to the detection results of the monitoring instrument assembly in the instrument room 5, the wind speed information is collected by the anemometer 51 in the detection instrument assembly and transmitted to the control host 9 for display. Then, the control host 9 adjusts the inverter of the variable frequency fan 2 to meet the test requirements under different wind speeds.

[0051] Start the refrigeration device 31, and according to the test results of the monitoring instrument assembly in the instrument room 5, the temperature information is collected by the thermometer 52 in the detection instrument assembly and transmitted to the control host 9 for display. Then, the refrigeration device 31 is adjusted by the control host 9 to meet the test requirements at different temperatures;

[0052] Start the atomizer 41, and atomize water vapor into the atomization chamber 4 to simulate foggy weather. According to the detection results of the monitoring instrument assembly in the instrument room 5, the humidity information is collected by the hygrometer 53 in the detection instrument assembly and transmitted to the control host 9 for display. Then, the inverter of the atomizer 41 is adjusted by the control host 9 to meet the foggy weather test requirements under different humidity conditions.

[0053] Start the spray mechanism 8, simulate light rain weather through the spray mechanism 8, and control the flow of the spray mechanism 8 through the control host 9 to meet the test requirements under different rainfall amounts;

[0054] S4: After the experiment is completed, the fan blade block 75 is removed from the rotating device 7, and the icing condition of the fan blade block 75 is checked, wherein the icing condition of the fan blade block 75 and the icing position are observed to draw conclusions of the simulation test, wherein the icing condition includes whether icing occurs, the maximum thickness of icing, and the quality of icing.

[0055] S5: Repeat until all simulation tests on the divided fan blade blocks 75 are completed.

[0056] In step 2, the corresponding linear velocity of each fan blade block 75 is calculated based on the on-site fan blade position and its linear velocity:

[0057] The radius of the rotating device 7 is 0.8m, and the rotation speed is 0-1000 rpm.

[0058] The calculation formula for the rotating equipment speed setting value z (r / min) is:

[0059]

[0060] Where n is the nth blade; Q (rev / min) is the speed of the on-site fan; L (m) is the length of the on-site fan blade.

[0061] Example 3:

[0062] Divide the small fan blades into 10 small pieces (such as Figure 5As shown), they are respectively installed and fixed on the rotating device 7 in the blade installation chamber 6. According to the rotation speed setting value z (rpm) of the rotating device, the corresponding speed of the rotating device 7 is adjusted; the variable frequency fan 2 is started, and the frequency is automatically adjusted by the control host 9. The anemometer 51 in the control instrument room 5 detects a result of 2m / s;

[0063] Start the refrigeration device 31, control the host 9 to automatically adjust the refrigeration temperature, and control the thermometer 52 in the instrument room 5 to detect the result of -1°C;

[0064] Start the atomizer 41, control the host 9 to automatically adjust the frequency, and control the humidity meter 53 in the instrument room 5 to detect a result of 90%;

[0065] Do not start the sprinkler system. After 2 hours of continuous operation, stop the operation, open the fan blade chamber, remove a small blade, and inspect the blade ice coverage. This involves taking photos, measuring the ice thickness and mass, and recording the results. This completes the icing simulation test for the first blade. Repeat the icing simulation test for blades 2 to 10.

[0066] Among them, the blade icing simulation test data is shown in Table 1:

[0067] Table 1: Blade icing simulation test data

[0068]

[0069] Experimental example:

[0070] On-site inspection results of a wind farm after ice accumulation on wind turbine blades on February 11, 2023:

[0071] At 09:20 on February 11, 2023, ice began to form on the wind turbine blades. The temperature was approximately -2°C, the wind speed was approximately 5m / s, the humidity was approximately 95%, there was light mist, and no freezing rain.

[0072] At 11:30 on February 11, 2023, the wind turbine was shut down and the blades were inspected. Ice was found from the tip to the middle of the blade, and the length of the ice was about 60% of the total length of the blade. The ice was located on the windward side and leading edge of the blade. The maximum thickness of the ice was at the tip of the blade, about 50 mm, and the thickness of the ice gradually decreased from the tip to the middle of the blade.

[0073] Based on the weather conditions of a wind farm on February 11, 2023, a wind turbine blade icing simulation test was conducted. The test data are shown in Table 2:

[0074] Table 2: Blade icing simulation test data

[0075]

[0076] The blade icing simulation test data in Table 2 show that after comparing the blade icing simulation test with the actual icing conditions of wind turbine blades on site, the blade icing simulation test results are basically consistent with the actual icing conditions of wind turbine blades on site in a certain wind farm (blade icing location, maximum ice thickness).

[0077] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A novel wind turbine blade icing simulation system, characterized in that: It comprises a ventilation duct (1) and a control host (9), wherein a variable frequency fan (2) is provided at the front end of the ventilation duct (1); The ventilation duct (1) is provided with an air heat exchange chamber (3), an atomization chamber (4), an instrument chamber (5) and a blade installation chamber (6) in sequence from the front end to the rear end; A refrigeration device (31) is installed in the air heat exchange chamber (3), an atomizer (41) is installed in the atomization chamber (4), and a monitoring instrument assembly is installed in the instrument chamber (5); A rotating device (7) is installed in the blade installation chamber (6), and the rotating device (7) is used to install the fan blade block (75) and drive it to rotate. The blade installation chamber (6) is also provided with a spray mechanism (8); The control host (9) is interactively electrically connected to the variable frequency fan (2), the refrigeration device (31), the atomizer (41), the monitoring instrument assembly, the rotating device (7), and the spray mechanism (8); The fan blade block (75) is obtained by evenly dividing the fan blade from the blade tip to the blade root into 10 small pieces to obtain the fan blade blocks (75) at different regions of the fan blade, wherein the length of the fan blade to be divided is 70% of the total length of the blade.

2. A novel wind turbine blade icing simulation system according to claim 1, characterized in that: The monitoring instrument assembly includes an anemometer (51), a thermometer (52) and a hygrometer (53).

3. The novel wind turbine blade icing simulation system according to claim 1 is characterized in that: The spray mechanism (8) comprises a water tank (81) and a spray head (83). The spray head (83) is installed in the blade installation chamber (6) to spray the interior thereof. A water pump (82) is provided on one side of the water tank (81), and the water pump (82) is used to extract water from the water tank (81) and transport it to the spray head (83).

4. The novel wind turbine blade icing simulation system according to claim 1 is characterized in that: The rotating device (7) comprises a frame (71), a rotating seat (73) is rotatably provided at the front side of the frame (71), a driving motor (72) is provided at the rear end of the frame (71), and the driving motor (72) is transmission-connected to the rotating seat (73) via a coupling, and a fan blade block (75) is detachably fixed to the outer side of the rotating seat (73) via a mounting frame (74).

5. The novel wind turbine blade icing simulation system according to claim 4 is characterized in that: There are three mounting frames (74) in total, and the three mounting frames (74) are located outside the rotating seat (73) and are distributed in a circular manner at equal angles.

6. The novel wind turbine blade icing simulation system according to claim 4 is characterized in that: The mounting frame (74) includes a base (741) fixed on the outside of the rotating base (73), two lateral positioning frames (76) are symmetrically fixed on the top of the base (741), a connecting screw (742) is vertically fixed on the base (741) between the two lateral positioning frames (76), and the top end of the connecting screw (742) is spirally connected to the top plate (743).

7. The novel wind turbine blade icing simulation system according to claim 6 is characterized in that: The sleeve (761) of the lateral positioning frame (76) is rotatably provided with a bidirectional adjustment screw rod (762) on the inner side of the sleeve (761), and two nut sleeves (763) are symmetrically sleeved on the bidirectional adjustment screw rod (762), and two support frames (764) are symmetrically hinged on the two nut sleeves (763), and an abutment frame (765) is rotatably connected between the two support frames (764).

8. A novel method for simulating ice coating on wind turbine blades, characterized in that: The novel wind turbine blade icing simulation system according to any one of claims 1 to 7 comprises the following steps: S1: evenly dividing the fan blade from the tip to the root into 10 small pieces to obtain fan blade blocks (75) at different regions of the fan blade; S2: Calculate the corresponding linear velocity of each fan blade block (75) according to the on-site fan blade position and its linear velocity, then fix the fan blade block (75) to the rotating device (7), and simulate the fan blade block (75) to achieve the on-site fan blade linear velocity by adjusting the rotation speed of the rotating device (7); S3: Start the variable frequency fan (2) to blow air into the ventilation duct (1), and according to the test results of the monitoring instrument components in the instrument room (5), adjust the frequency converter of the variable frequency fan (2) to meet the test requirements under different wind speeds; Starting the refrigeration device (31), and adjusting the refrigeration device (31) to meet the test requirements at different temperatures according to the test results of the monitoring instrument components in the instrument room (5); The atomizer (41) is started to atomize water vapor into the atomization chamber (4) to simulate foggy weather. According to the detection results of the monitoring instrument components in the instrument room (5), the frequency converter of the atomizer (41) is adjusted to meet the foggy weather test requirements under different humidity conditions. The spray mechanism (8) is started to simulate light rain weather through the spray mechanism (8), and the flow rate of the spray mechanism (8) is controlled to meet the test requirements under different rainfall amounts; S4: After the experiment is completed, the fan blade block (75) is removed from the rotating device (7), and the icing condition of the fan blade block (75) is checked, wherein the icing condition of the fan blade block (75) and the icing position are observed to obtain the conclusion of the simulation experiment, wherein the icing condition includes whether icing occurs, the maximum thickness of icing, and the quality of icing; S5: Repeat until all simulation tests on the divided fan blade blocks (75) are completed.

9. The novel wind turbine blade icing simulation method according to claim 8, characterized in that: In step 2, the corresponding linear velocity of each fan blade block (75) is calculated based on the on-site fan blade position and its linear velocity: The rotating device (7) has a radius of 0.8 m and a rotation speed of 0-1000 rpm. The calculation formula for the rotating equipment speed setting value z (r / min) is: Where n is the nth blade; Q (rev / min) is the speed of the on-site fan; L (m) is the length of the on-site fan blade.

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