A dolphin head line imitating bionic leading edge slat wing, blade and preparation method

Abstract

The application provides a dolphin head profile imitated biomimetic leading edge slot wing, a blade and a preparation method. The biomimetic leading edge slot wing is made of a leading edge slot wing profile based on a dolphin head profile. The leading edge slot wing profile is obtained by tangent transition connection of a biomimetic leading edge profile line and an inner profile line of the leading edge slot wing profile through a smooth transition line. The dolphin head profile is obtained by equal ratio scaling according to the size of a basic blade airfoil. The corresponding part of the basic blade airfoil leading edge and the biomimetic leading edge profile line is the inner profile line of the leading edge slot wing profile. The application is based on a passive control technology. The biomimetic leading edge slot wing is designed according to the characteristics of a dolphin head. The biomimetic leading edge slot wing and the basic blade are directly connected through an adjusting device and a slot wing connecting piece. The aerodynamic performance of the blade is improved without changing the overall shape of the basic blade, so as to inhibit the negative influence of flow separation and dynamic stall on the blade.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid mechanical equipment, and in particular relates to a bionic leading edge slat and blade imitating a dolphin head profile, and a preparation method thereof. Background Art

[0002] Flow separation is a common phenomenon in airfoil turbulence. Flow separation and dynamic stall can lead to increased blade fatigue loads, thereby reducing the aerodynamic performance and overall efficiency of turbomachinery and aviation blades. Therefore, controlling flow separation and dynamic stall is a hot research topic. Passive control technology is a simple and effective method that does not require the introduction of external energy. Furthermore, bionics, as a link between nature and science, has made great progress in improving the aerodynamic performance of airfoils. Bionics-based control technology provides new ideas and methods for the design and manufacture of turbomachinery and aviation blades. Therefore, drawing inspiration from nature to invent various control methods such as energy saving, drag reduction, noise reduction, and flow separation suppression will help further improve the design level of turbomachinery and aviation blades and the performance of developed products. Summary of the Invention

[0003] To address the challenges of the existing technology, the present invention provides a bionic leading-edge slat and blade that mimic the contours of a dolphin's head, as well as a method for fabricating the same. Based on biomimetic passive control technology, the bionic leading-edge slat is designed based on the characteristics of a dolphin's head and directly connected to the base blade. While maintaining the overall shape of the base blade, the slat improves the blade's aerodynamic performance and mitigates the negative impacts of flow separation and dynamic stall on the blade.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a bionic leading edge slat imitating a dolphin head profile, wherein the bionic leading edge slat is made of a leading edge slat profile based on the imitating dolphin head profile, and the leading edge slat profile is obtained by tangentially transitioning the bionic slat leading edge profile line and the inner profile line of the leading edge slat profile through a smooth transition line, wherein the bionic slat leading edge profile is obtained by scaling the dolphin head profile proportionally according to the size of the basic blade airfoil, and the portion of the leading edge of the basic blade airfoil corresponding to the bionic slat leading edge profile is the inner profile line of the leading edge slat profile.

[0005] The present invention also discloses a method for preparing a bionic leading edge slat imitating a dolphin head profile, the specific steps of which are as follows:

[0006] S1 carries out actual dolphin head contour extraction, establishes an x-y coordinate system with a dolphin head leading edge point as a coordinate origin, acquires dolphin head feature points, divides the feature points into four parts A, B, C and D according to the characteristics of the curves where the feature points are located, carries out nonlinear curve fitting on the feature points of the four parts A, B, C and D, and obtains fitting curve 1, fitting curve 2, fitting curve 3 and fitting curve 4;

[0007] S2 connects the obtained fitting curve 1, fitting curve 2, fitting curve 3 and fitting curve 4 end to end to obtain a dolphin head line, introduces a difference coefficient k, and obtains a dolphin head line of different sizes of dolphins;

[0008] S3 scales the dolphin head line of different sizes of dolphins according to the size of the basic blade airfoil, and obtains a biomimetic slat leading edge contour line;

[0009] S4 connects the corresponding part of the basic blade airfoil leading edge and the biomimetic slat leading edge contour line to the biomimetic slat leading edge contour line through the tangent transition of a smooth transition line to obtain a leading edge slat contour, and extends the biomimetic leading edge slat contour (12) along the spanwise direction to obtain a biomimetic leading edge slat.

[0010] Further, in S1, the equations corresponding to fitting curve 1, fitting curve 2, fitting curve 3 and fitting curve 4 are:

[0011]

[0012] Further, in S2, the difference coefficient k = 0.2-2, and the fitting equations of the dolphin head lines of different sizes of dolphins are y 1k , y 2k , y 3k , and y 4k , which are as follows:

[0013]

[0014] Further, in S3, the dolphin head line of different sizes of dolphins is scaled by j times, where H2 = j x H1, H1 is the vertical distance between the upper and lower endpoints of the dolphin head line, and H2 is the vertical distance between the upper and lower endpoints of the basic blade airfoil leading edge contour line.

[0015] Further, the distance between the lower end point of the dolphin head line and the leading edge point of the dolphin head line is L1, the distance between the upper end point of the dolphin head line and the leading edge point of the dolphin head line is L2, and L1 = 0.85L2, so as to obtain the vertical distance H1 between the upper and lower end points of the dolphin head line.

[0016] Further, the part corresponding to the profile line of the leading edge of the bionic slat of the leading edge profile line of the basic blade airfoil satisfies: the horizontal distance between the lower end point of the leading edge profile line of the basic blade airfoil and the leading edge point of the basic blade airfoil is X1, X1=0.05c; the horizontal distance between the upper end point of the leading edge profile line of the basic blade airfoil and the lower end point of the leading edge profile line of the basic blade airfoil is X2, X2=0.22c; the vertical distance between the upper and lower end points of the leading edge profile line of the basic blade airfoil is H2; wherein c is the chord length of the basic blade airfoil.

[0017] The application further provides a blade with a bionic leading edge slat, comprising the bionic leading edge slat and the basic blade according to any one of claims 1-3, and an adjusting device is arranged on each side wall of the basic blade, and a slat connecting piece is arranged on each side of the bionic leading edge slat, and the adjusting device is rotationally connected with the corresponding slat connecting piece to realize the connection between the basic blade and the bionic leading edge slat.

[0018] Further, the adjusting device comprises a first steering wheel, a push rod inner cylinder, a second steering wheel and a push rod system, the second steering wheel is fixed on the side wall of the basic blade, one end of the push rod system is connected with the steering wheel shaft of the second steering wheel, the push rod inner cylinder is arranged in the push rod system, the other end of the push rod system is connected with one end of the first steering wheel through the push rod inner cylinder, and the slat connecting piece is connected with the steering wheel shaft of the first steering wheel.

[0019] Further, the movement state of the bionic leading edge slat comprises:

[0020] 1. The leading edge slat is lowered or raised: the first steering wheel drives the slat connecting piece to rotate to realize the lowering or raising of the bionic leading edge slat;

[0021] 2. The push rod is elongated or shortened: the first steering wheel drives the slat connecting piece to rotate to realize the lowering or raising of the bionic leading edge slat; the push rod inner cylinder in the push rod system is elongated or shortened, and the bionic leading edge slat is away from or close to the basic blade;

[0022] 3. The push rod is elongated or shortened: the push rod inner cylinder in the push rod system is elongated or shortened, and the bionic leading edge slat is away from or close to the basic blade;

[0023] 4. The push rod is elongated or shortened, and the slat is turned down or up: the first steering wheel drives the slat connecting piece to rotate to realize the lowering or raising of the bionic leading edge slat; the push rod inner cylinder in the push rod system is elongated or shortened, and the bionic leading edge slat is away from or close to the basic blade; the second steering wheel drives the push rod system, the first steering wheel, the slat connecting piece and the bionic leading edge slat to turn down or up.

[0024] Compared with the prior art, the application has at least the following beneficial effects:

[0025] The application discloses a dolphin head profile imitated biomimetic leading edge slat, which is designed according to the characteristics of a dolphin head. The dolphin is one of the fastest animals in the ocean, and has formed a special head profile in long-term natural evolution. No matter how flexible the part is, the dolphin head profile has a high-efficient drag reduction mechanism and fast and low-noise swimming characteristics. In addition, the dolphin head is the flow surface of the impinging airflow, and the incoming flow will have a great impact on the dolphin head. However, the actual dolphin head profile can effectively alleviate the impact of the incoming flow, effectively distribute the flow, and reduce the flow resistance. The leading edge flap is also subjected to a great airflow impact and resistance as the flow surface. The biomimetic leading edge slat with the dolphin head profile can reduce part of the flow loss and improve the aerodynamic performance of the airfoil.

[0026] The application also provides a blade with the biomimetic leading edge slat. The biomimetic leading edge slat is directly added to the basic blade, without the need of introducing external energy or modifying the basic blade, so that the aerodynamic performance of the blade is further improved.

[0027] Further, according to the feature that the dolphin deflects the head when jumping out of the water and entering the water to reduce the resistance of the dolphin itself when jumping out of the water and entering the water, the biomimetic leading edge slat is rotatably and movably arranged on the basic blade. The biomimetic leading edge slat can dynamically adjust the pitch state and the distance between the biomimetic leading edge slat and the basic blade according to different working conditions, relieve the influence of stall on the blade, make the blade have higher aerodynamic performance, and further improve the energy utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The dolphin head feature graph selected by the application;

[0029] Figure 2 The dolphin head feature point graph of the application;

[0030] Figure 3 The dolphin head feature point and fitting curve of the application;

[0031] Figure 4 The dolphin leading edge head fitting graph of the application;

[0032] Figure 5 The generation graph of the biomimetic leading edge slat of the application;

[0033] Figure 6 The motion characteristic graph of the adjustment angle of the biomimetic leading edge slat of the application;

[0034] Figure 7 The front view of the blade to which the biomimetic leading edge slat of the application is added;

[0035] Figure 8 The top view of the blade to which the biomimetic leading edge slat of the application is addedFigure 1 ;

[0036] Figure 9 Top view of the blade with bionic leading edge slat added to the invention Figure 2 ;

[0037] Figure 10 Side view of the blade with bionic leading edge slat added to the invention

[0038] Figure 11 Front view of the bionic leading edge slat of the invention

[0039] Figure 12 Side view of the bionic leading edge slat of the invention

[0040] Figure 13 Different motion state diagram of the bionic leading edge slat of the invention Figure 13 a. Slat down view front view Figure 13 b. Slat down view side view Figure 13 c. Push rod extension-slat down view front view Figure 13 d. Push rod extension-slat down view side view Figure 13 e. Push rod extension front view Figure 13 f. Push rod extension side view Figure 13 g. Push rod extension down turning-slat up front view Figure 13 h. Push rod extension down turning-slat up side view

[0041] In the drawings: 1-bionic leading edge slat, 2-basic blade, 3-slat connector, 4-first steering gear, 5-push rod inner cylinder, 6-push rod system, 7-second steering gear, 8-basic blade airfoil, 9-bionic slat leading edge contour line, 10-smooth transition line, 11-basic blade airfoil leading edge, 12-leading edge slat contour, 13-imitate dolphin head line lower end point, 14-imitate dolphin head line upper end point, 15-basic blade airfoil leading edge contour line lower end point, 16-basic blade airfoil leading edge contour line upper end point. DETAILED DESCRIPTION

[0042] The invention will be further described in conjunction with the drawings and specific embodiments.

[0043] In order to suppress the impact of flow separation and dynamic stall on the aerodynamic performance and stability of the blades, the present invention proposes a bionic-based passive control technology to suppress the negative impact of flow separation and dynamic stall on the blades. As one of the fastest-swimming creatures in the ocean, the dolphin's head has a high drag reduction effect due to long-term natural evolution. In addition, the dolphin's head is the main frontal surface, and the incoming flow has a greater impact on the dolphin's head, so the entire head will be subject to greater pressure and resistance. Since the special shape of the dolphin's head can effectively alleviate the impact of the incoming flow, effectively divert the flow, and reduce flow resistance, the leading edge slat is widely used as a lift-enhancing device. Therefore, the present invention applies the characteristics of the dolphin's head to the preparation of the leading edge slat, and directly connects the obtained bionic leading edge slat 1 to the base blade 2. This can ensure that the overall shape of the base blade 2 remains unchanged while improving the aerodynamic performance of the blade.

[0044] The present invention provides a bionic leading edge slat imitating the dolphin head profile, and selects a part that can represent the characteristics of the dolphin head as the basis of the leading edge slat. Figure 1 As shown, specifically, the dolphin head-like profile is scaled proportionally according to the size of the basic blade airfoil 8 to obtain the bionic slat leading edge contour line 9, and the inner profile of the bionic slat leading edge contour line 12 is obtained according to the leading edge 11 of the basic blade airfoil. The bionic slat leading edge contour line 9 and the inner profile are combined inside and outside to finally obtain the leading edge slat contour line 12 of the dolphin head-like profile, as shown in FIG. Figure 11 As shown, the obtained bionic leading edge slat profile 12 is extended along the span direction (radial direction) to obtain a bionic leading edge slat, as shown in FIG. Figure 12 As shown;

[0045] The steps for obtaining the leading edge slat profile 20 are as follows:

[0046] 1. In order to extract the features of the dolphin head, the actual dolphin head contour is first extracted, and then the inverse reconstruction method is used to establish an xy coordinate system with the front edge of the dolphin head as the coordinate origin to obtain the dolphin head feature points x, y. The extracted dolphin head feature points are as follows: Figure 2 shown.

[0047] 2. The extracted dolphin head feature points are divided into four parts: A, B, C, and D according to the curve characteristics of the feature points. The feature points of the above four parts correspond to Figure 3 The characteristic points of the type line 1, type line 2, type line 3 and type line 4 are selected, and nonlinear curve fitting is performed on these four parts of the type line characteristic points. Figure 3 The nonlinear fitting curve corresponding to the characteristic point of the middle line 1 is the fitting curve 1; the nonlinear fitting curve corresponding to the characteristic point of the middle line 2 is the fitting curve 2; Figure 3 The nonlinear fitting curve corresponding to the characteristic point 3 of the middle line is fitting curve 3;Figure 3 The nonlinear fitting curve corresponding to the feature points of the medium line 4 is fitting curve 4; the fitting curve 1, the fitting curve 2, the fitting curve 3 and the fitting curve 4 are connected in sequence to obtain the dolphin head line as shown in Figure 4 .

[0048] The equations corresponding to the fitting curve 1, the fitting curve 2, the fitting curve 3 and the fitting curve 4 are as follows:

[0049]

[0050] A difference coefficient k is introduced into the above equation, k = 0.2-2, and the above equation is adjusted to obtain the dolphin head line suitable for dolphins of different sizes. The fitting equations y 1k , y 2k , y 3k , and y 4k of the dolphin head line suitable for dolphins of different sizes are as follows:

[0051]

[0052] 3. In order to apply the dolphin head line obtained by the above equation to the leading edge of the basic blade of different sizes, the fitting equations y 1k , y 2k , y 3k , and y 4k corresponding to the fitting curve 1, the fitting curve 2, the fitting curve 3 and the fitting curve 4 are scaled by j times according to the size of the basic blade airfoil. The biomimetic slat leading edge profile equation corresponding to the fitting curve 1, the fitting curve 2, the fitting curve 3 and the fitting curve 4 scaled by j times is h1, h2, h3 and h4:

[0053]

[0054] The fitting curve 1, the fitting curve 2, the fitting curve 3 and the fitting curve 4 scaled by j times are connected in sequence, so that the biomimetic slat leading edge profile line 9 suitable for the basic blade airfoil of a certain size is obtained.

[0055] The scaling multiple j satisfies:

[0056] H2 = j x H1

[0057] Wherein, H1 is the vertical distance between the upper and lower endpoints of the dolphin head line, and H2 is the vertical distance between the upper and lower endpoints of the basic blade airfoil leading edge profile line.

[0058] As shown in Figure 4As shown in the figure, the distance between the lower end point 13 of the dolphin head profile line and the leading edge point of the dolphin head profile line is defined as L1, and the distance between the upper end point 14 of the dolphin head profile line and the leading edge point of the dolphin head profile line is defined as L2, L1=0.85L2, and L1 and L2 are substituted as the horizontal coordinate values ​​into the fitting equation y 1k and y 4k , respectively obtain the ordinates of the upper and lower endpoints of the dolphin head imitation line, and add the absolute values ​​of the two ordinates to obtain the vertical distance between the upper and lower endpoints of the dolphin head imitation line as H1;

[0059] like Figure 5 As shown, the portion corresponding to the basic blade airfoil leading edge 11 and the bionic slat leading edge contour line 9 serves as the inner profile line of the bionic leading edge slat profile 12. The shapes and sizes of the two portions of the curve of the basic blade airfoil leading edge 11 and the inner profile line of the bionic leading edge slat profile 12 are equal. The bionic slat leading edge contour line 9 and the inner profile line of the bionic leading edge slat profile 12 are connected by a tangent transition of a smooth transition line 10 to obtain the bionic leading edge slat profile 12.

[0060] The inner profile line of the bionic leading edge slat profile 12 satisfies: the horizontal distance between the lower end point 15 of the basic blade airfoil leading edge contour and the leading edge point of the basic blade airfoil is X1, X1=0.05c; the horizontal distance between the upper end point 16 of the basic blade airfoil leading edge contour and the lower end point 15 of the basic blade airfoil leading edge contour is X2, X2=0.22c; the vertical distance between the upper and lower end points of the basic blade airfoil leading edge contour is H2; where c is the chord length of the basic blade airfoil 8.

[0061] like Figures 7-10 As shown, the present invention provides a blade with the above-mentioned bionic leading edge slat, and the above-mentioned bionic leading edge slat is directly installed at the front end of the basic blade without modifying the blade shape of the basic blade, so that the integrity of the basic blade can be ensured, and the width of the bionic leading edge slat is the same as the width of the basic blade.

[0062] Furthermore, the leading edge slat of the present invention is an adjustable leading edge slat, an adjustment device is provided on both side walls of the basic blade 2, and a slat connector 3 is provided on both sides of the bionic leading edge slat 1. The adjustment device is rotatably connected to the slat connector 3 to realize the connection between the basic blade 2 and the bionic leading edge slat 1.

[0063] The adjusting device comprises a first steering engine 4, a push rod inner cylinder 5, a second steering engine 7 and a push rod system 6, the second steering engine 7 is fixed on the side wall of the base blade 2, one end of the push rod system 6 is connected with the steering engine shaft of the second steering engine 7 to realize the rotation of the push rod system 6, the push rod system 6 is provided with the push rod inner cylinder 5, the bionic leading edge slat 1 can adjust the length of the push rod inner cylinder 5 and further adjust the distance between the bionic leading edge slat 1 and the base blade 2 according to different working conditions through the push rod system 6, the other end of the push rod system 6 is connected with one end of the first steering engine 4 through the push rod inner cylinder 5, and the slat connecting piece 3 is connected with the steering engine shaft of the first steering engine 4 to realize the rotation of the slat connecting piece 3.

[0064] Preferably, as shown in Figure 6 , the dolphin is one of marine organisms with small swimming resistance and low noise, the head contour structure of the dolphin is special, the swimming speed of the dolphin is fast, when the dolphin encounters a prey, the head of the dolphin is adjusted to an upward or downward posture to accelerate swimming, so as to further reduce the resistance of the surrounding fluid to the head of the dolphin, inhibit the generation of swimming noise, improve the swimming efficiency, and further provide good hydrodynamic advantage for the dolphin during the hunting attack and improve the hunting success rate; the change of the gap width d between the bionic leading edge slat trailing edge and the base blade leading edge, and the adjustment of the pitch angles α and β of the bionic leading edge slat 1 can all change the aerodynamic performance of the blade, the present application adjusts the gap width d by the lengthening or shortening of the push rod system 6, adjusts the pitch angles of the bionic leading edge slat 1 by adjusting the rotation angles α of the slat connecting piece 3 and the rotation angles β of the push rod system 6, as shown in Figure 13 , the gap width d is the distance between the inside line leading edge point of the bionic leading edge slat contour 12 and the base blade leading edge point in the vertical direction, the rotation angle α of the slat connecting piece 3 is the included angle between the center line of the slat connecting piece 3 after swinging and the horizontal direction, and the rotation angle β of the push rod system 6 is the included angle between the center line of the push rod system 6 after swinging and the horizontal direction, in particular:

[0065] The motion state of the bionic leading edge slat 1 is determined according to the working conditions of the rotating impeller machine and the aviation blade, and the motion state of the bionic leading edge slat 1 is mainly divided into the following types, as shown in Figure 13 .

[0066] ①As shown in Figure 13 a, 13b, the leading edge slat is downward (upward): according to the actual working conditions of the rotating impeller machine and the aviation blade, the leading edge slat needs to change the rotation angle α of the leading edge slat. In this case, the first steering engine 4 works, the steering engine shaft of the first steering engine 4 drives the slat connecting piece 3 and the bionic leading edge slat 1 to be downward or upward to change the rotation angle α of the leading edge slat, so as to change the aerodynamic performance of the blade.

[0067] ②As shown in Figure 13 c, Figure 13As shown in Figure d, the push rod extends (shortens) and the slat pitches down (up): Depending on the actual operating conditions of the rotating turbine machinery and aviation blades, the bionic leading edge slat 1 needs to increase (decrease) the slot width d of the bionic leading edge slat 1 and change the rotation angle α of the bionic leading edge slat 1. In this case, the first servo 4 and the push rod system 6 are in operation. The servo shaft of the first servo 4 drives the slat connector 3 and the bionic leading edge slat 1 to pitch down or up to change the rotation angle α of the slat. When the push rod system 6 is in operation, the push rod inner tube 5 in the push rod system 6 extends (shortens), and the slot width d of the slat is changed, thereby improving the aerodynamic performance of the blade.

[0068] ③ Such as Figure 13 e. Figure 13 As shown in Figure f, the push rod is extended (shortened): Based on the actual operating conditions of rotating turbine machinery and aviation blades, the bionic leading edge slat 1 needs to increase (decrease) the slat's slot width d. In this case, the push rod system 6 is activated, and the push rod inner tube 5 within the push rod system 6 is extended (shortened), changing the slat's slot width d, thereby improving the blade's aerodynamic performance.

[0069] ④ Such as Figure 13 As shown in Figures 13g and 13h, the push rod extends (shortens) and rotates downward (upward) - the slat pitches upward (downward): Depending on the actual operating conditions of the rotating turbine machinery and aviation blades, the bionic leading edge slat 1 needs to increase (decrease) the slot width d of the bionic leading edge slat 1 and change the slat rotation angle α and the push rod rotation angle β to adjust the slat pitch angle. In this case, the first servo 4, the push rod system 6, and the servo 27 operate. The servo shaft of the first servo 4 drives the slat connector 3 and the bionic leading edge slat 1 to pitch upward to change the slat rotation angle α; the push rod system 6 operates, and the push rod inner tube 5 in the push rod system 6 extends (shortens), changing the slat slot width d; the servo shaft of the servo 27 drives the push rod system 6, the first servo 4, the slat connector 3, and the bionic leading edge slat 1 to rotate downward to change the push rod rotation angle β, thereby improving the aerodynamic performance of the blade.

Claims

1. A bionic leading edge slat imitating the dolphin head profile, characterized in that: The bionic leading edge slat is made of a bionic leading edge slat profile (12) based on a dolphin head profile, and the bionic leading edge slat profile (12) is obtained by tangentially transitioning the bionic leading edge slat profile (9) and the inner profile of the bionic leading edge slat profile (12) through a smooth transition line (10), wherein the bionic leading edge slat profile (9) is obtained by scaling the dolphin head profile according to the size of the basic blade airfoil (8), and the portion of the basic blade airfoil leading edge (11) corresponding to the bionic leading edge slat profile (9) is the inner profile of the bionic leading edge slat profile (12); The method for preparing the bionic leading edge slat imitating the dolphin head profile comprises the following specific steps: S1 extracts the actual dolphin head contour, establishes an xy coordinate system with the front edge of the dolphin head as the coordinate origin, obtains the characteristic points of the dolphin head, divides the characteristic points into four parts A, B, C, and D according to the characteristics of the curve where the characteristic points are located, and performs nonlinear curve fitting on the characteristic points of the four parts A, B, C, and D to obtain fitting curves 1, 2, 3, and 4; S2 connects the obtained fitting curve 1, fitting curve 2, fitting curve 3 and fitting curve 4 end to end to obtain the dolphin head-like shape line, introduces the difference coefficient k, and obtains the dolphin head-like shape lines of dolphins of different sizes; S3 scales the dolphin head profiles of dolphins of different sizes according to the size of the basic blade airfoil (8) to obtain the bionic slat leading edge contour line (9); S4 connects the portion of the basic blade airfoil leading edge (11) corresponding to the bionic slat leading edge contour line (9) with the bionic slat leading edge contour line (9) through a tangent transition of a smooth transition line (10) to obtain a bionic leading edge slat contour (12), and extends the bionic leading edge slat contour (12) along the span direction to obtain a bionic leading edge slat; In S1, the equations corresponding to fitting curve 1, fitting curve 2, fitting curve 3 and fitting curve 4 are: In S2, the difference coefficient k=0.2~2, the fitting equation of the dolphin head line of dolphins of different sizes y 1k 、 y 2k 、 y 3k ,and y 4k , as follows: In S3, the dolphin head lines of dolphins of different sizes are j times the zoom, where , H 1 is the vertical distance between the upper and lower endpoints of the dolphin head line, H 2 is the vertical distance between the upper and lower endpoints of the leading edge contour line of the basic blade airfoil; Let the distance between the lower end point (13) of the dolphin head line and the leading edge point of the dolphin head line be L 1. The distance between the upper end point (14) of the dolphin head imitation line and the leading edge point of the dolphin head imitation line is L 2. Yes L 1=0.85 L 2. Obtain the vertical distance between the upper and lower endpoints of the dolphin head line H 1; The portion of the leading edge of the basic blade airfoil (11) corresponding to the contour line of the leading edge of the bionic slat (9) satisfies the following conditions: The horizontal distance between the lower end point (15) of the contour line of the leading edge of the basic blade airfoil and the leading edge point of the basic blade airfoil is X 1, X 1=0.05 c The horizontal distance between the upper end point (16) of the basic blade airfoil leading edge contour line and the lower end point (15) of the basic blade airfoil leading edge contour line is X 2, X 2=0.22 c ; The vertical distance between the upper and lower endpoints of the leading edge contour line of the basic blade airfoil H 2; among them, c is the chord length of the base blade airfoil (8).

2. A blade with a bionic leading edge slat, characterized in that: The present invention comprises a bionic leading edge slat (1) and a basic blade (2) in a bionic leading edge slat imitating a dolphin head profile as claimed in claim 1, wherein an adjusting device is provided on both side walls of the basic blade (2), and a slat connector (3) is provided on both sides of the bionic leading edge slat (1), and the adjusting device is rotatably connected to the corresponding slat connector (3) to realize the connection between the basic blade (2) and the bionic leading edge slat (1).

3. The blade with a bionic leading edge slat according to claim 2, characterized in that: The regulating device comprises a first steering gear (4), a push rod inner tube (5), a second steering gear (7) and a push rod system (6), wherein the second steering gear (7) is fixed on the side wall of the base blade (2), one end of the push rod system (6) is connected to the steering gear shaft of the second steering gear (7), the push rod inner tube (5) is arranged in the push rod system (6), the other end of the push rod system (6) is connected to one end of the first steering gear (4) through the push rod inner tube (5), and the slat connector (3) is connected to the steering gear shaft of the first steering gear (4).

4. The blade with a bionic leading edge slat according to claim 3, characterized in that: The motion states of the bionic leading edge slat (1) include: The leading edge slat pitches down or up: the first steering gear (4) drives the slat connector (3) to rotate to achieve the bionic leading edge slat (1) pitching down or up; The push rod is extended or shortened - the slat is pitched down or up: the first steering gear (4) drives the slat connector (3) to rotate to achieve the bionic leading edge slat (1) to pitch down or up; the push rod inner tube (5) in the push rod system (6) is extended or shortened, and the bionic leading edge slat (1) moves away from or close to the base blade (2); Push rod extension or shortening: the push rod inner tube (5) in the push rod system (6) is extended or shortened, and the bionic leading edge slat (1) moves away from or closer to the base blade (2); The push rod is extended or shortened, rotated downward or upward - the wing slot is pitched upward or downward: the first steering gear (4) drives the slat connector (3) to rotate to achieve the bionic leading edge slat (1) to pitch downward or upward; the push rod inner tube (5) in the push rod system (6) is extended or shortened, and the bionic leading edge slat (1) moves away from or close to the base blade (2); the second steering gear (7) drives the push rod system (6), the first steering gear (4), the slat connector (3) and the bionic leading edge slat (1) to rotate downward or upward.

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