CN114194354A - Design method of bionic type flow guide cover with noise reduction function - Google Patents

Design method of bionic type flow guide cover with noise reduction function Download PDF

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Publication number
CN114194354A
CN114194354A CN202111509723.0A CN202111509723A CN114194354A CN 114194354 A CN114194354 A CN 114194354A CN 202111509723 A CN202111509723 A CN 202111509723A CN 114194354 A CN114194354 A CN 114194354A
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air guide
guide sleeve
spherical
section
upper cover
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CN114194354B (en
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陈超
季爱林
张正清
卞辰慧
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Haiying Enterprise Group Co Ltd
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Haiying Enterprise Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B71/00—Designing vessels; Predicting their performance
    • B63B71/10—Designing vessels; Predicting their performance using computer simulation, e.g. finite element method [FEM] or computational fluid dynamics [CFD]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B63B2017/0045—Caps, hoods, or the like devices for protective purposes, not otherwise provided for
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/10—Numerical modelling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Abstract

The invention relates to a design method of a bionic air guide sleeve with a noise reduction function, wherein the prototype air guide sleeve comprises an upper cover, a middle section and a bottom cabin, spherical bulges are uniformly distributed on the surfaces of the upper cover, the middle section and the bottom cabin so as to achieve the effect of reducing the sound pressure intensity of surface flow noise of the air guide sleeve in the advancing process, and the design method comprises the following steps: keeping the main body shape and structure of the prototype air guide sleeve unchanged, and carrying out flow field numerical simulation on the prototype air guide sleeve; performing bionic structure design on the outer surface of the prototype air guide sleeve; and carrying out numerical simulation verification on the noise reduction effect of the bionic air guide sleeve. The invention provides a bionic structure design method for enabling a sonar air guide sleeve to have noise reduction performance, and the air guide sleeve with the bionic structure can be designed through the design method, so that the interference of flow-induced noise on sonar signals is reduced, and the accuracy of the signals is improved.

Description

Design method of bionic type flow guide cover with noise reduction function
Technical Field
The invention relates to a design technology of a ship sonar air guide cover, in particular to a design method of a bionic air guide cover with a noise reduction function.
Background
When the ship runs at a high speed, due to the excitation effect of the fluid, the surface of the sonar air guide sleeve generates flow-induced noise. The flow-induced noise interferes with the acquisition of sonar signals, generates redundant signals and influences the judgment of a sound source result, so that a design method for reducing the influence of the noise on the air guide sleeve signals is needed.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the problem that the bionic air guide sleeve interferes with the acquisition of sonar signals under the influence of flow excitation noise to generate redundant signals in the prior art, so that the bionic air guide sleeve design method with the noise reduction function is provided.
In order to solve the above technical problems, the present invention provides a method for designing a bionic air guide sleeve with a noise reduction function, wherein the prototype air guide sleeve comprises an upper cover, a middle section and a bottom cabin, and spherical protrusions are uniformly arranged on the surfaces of the upper cover, the middle section and the bottom cabin to achieve the effect of reducing the sound pressure intensity of the noise on the surface of the air guide sleeve in the process of moving, and the method comprises the following steps:
step S1: keeping the main body shape and structure of the prototype air guide sleeve unchanged, and carrying out numerical simulation on flow field data of the prototype air guide sleeve;
step S2: performing bionic structure design on the outer surface of the prototype air guide sleeve;
step S3: given the defined spherical lobe diameter d,
Figure BDA0003404771480000011
in the formula: u-dynamic viscosity coefficient of water at 25 ℃ of 0.9 x 10-6m2S; rho-density of liquid, kg/m3；AGeneral assemblyTotal area of dome casing, m2(ii) a v-speed of the pod in the water, m/s; a-area of plane or curved surface of the portion where the spherical projection is located, m2(ii) a V-total volume of the dome, m3(ii) a c-the chord length of the cross section line of the air guide sleeve, m; t is the maximum thickness of the section, m; tau is0-mean shear stress, Pa, of the dome outer wall surface where the spherical protrusion is located;
step S4: the distance between the center of a first row of spherical bulges in the middle section of the air guide sleeve along the direction from the upper part to the lower part and the projection line of the upper side surface of the air guide sleeve is defined as n, the unit is mm,
Figure BDA0003404771480000012
in the formula: d-spherical bulge diameter, mm; g-acceleration of gravity, m2S; h is the height of the middle section of the air guide sleeve, m; h, the depth of the gravity center of the air guide sleeve from the water surface is m; v-total pod volume, m 3; v-speed of the pod in the water, m/s;
step S5: the distance between the center of the k-th row of spherical protrusions in the head-to-tail direction of the middle section of the air guide sleeve and the side projection of the center of the (k-1) -th row of spherical protrusions in mm is defined as pk,
Figure BDA0003404771480000021
in the formula: d-spherical bulge diameter, mm; c-the chord length of the cross section line of the air guide sleeve, m; t is the maximum thickness of the section, m; g-acceleration of gravity, m2S; t is the maximum thickness of the section, m; v-speed of the pod in the water, m/s; a, taking a value of 1-10 as a dimensionless constant; h, the depth of the gravity center of the air guide sleeve from the water surface is m;
step S6: the distance between the centers of two adjacent rows of spherical bulges in the direction from the upper part to the lower part of the middle section of the air guide sleeve is defined as j, unit mm,
Figure BDA0003404771480000022
in the formula: d-spherical bulge diameter, mm; h is the height of the middle section of the air guide sleeve, m; c-the chord length of the cross section line of the air guide sleeve, m; b*-a dimensionless constant, valued at t/c-3; n is the distance between the center of the first row of spherical protrusions in the middle section of the air guide sleeve along the direction from the upper part to the lower part and the side projection line on the upper part of the air guide sleeve, and is mm;
step S7: taking the clockwise direction as positive, on the kth cross section, the included angle between the first and the last spherical bulge and the plane projection line on the upper side of the bottom of the flow guide cover is thetak0Unit degree; n is uniformly distributed between the first and the last spherical bulgekEach spherical bulge, the included angle between the adjacent spherical bulges is thetak；
Figure BDA0003404771480000023
C is the chord length of the section line of the air guide sleeve, m; tau iskThe average shear stress of the kth cross section at the bottom of the dome is obtained by numerical simulation to obtain a value pa; rho-density of liquid, kg/m3；
Figure BDA0003404771480000024
Wherein N is a dimensionless coefficient in the range of 1-10 eRk；Xk-the kth cross section is plotted on the abscissa in the coordinate system shown in fig. 6; x0-f (x) the coordinate value of x at the maximum value; rk-the kth cross-sectional line radius, m;
therefore, the temperature of the molten steel is controlled,
Figure BDA0003404771480000025
step S8: setting up a right angle seatThe system is characterized in that the function of the middle ring contour line above the X axis is g (X), and the distance from the first row of spherical bulges to the origin along the head-tail direction is a0The distance between the spherical bulge of the kth column and the (k-1) th column is bkThe number of the spherical bulges in the kth column is Mk；
Figure BDA0003404771480000026
D-the diameter of the spherical bulge positioned in the middle ring of the upper cover is mm; c. C0The chord length of the ring contour line m of the upper cover; t is t0The ring contour line of the upper cover has the maximum thickness of m; v-speed of the pod in the water, m/s; tau is0-ring mean shear stress in the upper lid, Pa; rho-density of liquid, kg/m3(ii) a u-dynamic viscosity coefficient of water at 25 ℃ of 0.9 x 10-6m2/s；
Figure BDA0003404771480000031
Figure BDA0003404771480000032
In the formula: d-the diameter of the spherical bulge in the upper cover is mm; c 0-chord length of ring contour in upper cover, m; c-non-dimensional coefficients; g-acceleration of gravity, m2S; t 0-maximum thickness of the ring contour line in the upper cover, m; v-speed of the pod in the water, m/s; h, the depth of the gravity center of the air guide sleeve from the water surface is m; xk-1-the coordinate value of column k-1 on the X axis; a. theUpper coverTotal area of the dome cover in the top view direction, m2；AMiddle ringArea of the middle ring region of the dome upper cover, m2；
Figure BDA0003404771480000033
In the formula: d-inner ring spherical convex of upper coverThe diameter of the screw, mm; m is*-dimensionless coefficients with a value range of 1-3; xk-column k coordinate value on the X axis; w is related to the thickness value of the inner ring of the upper cover on the kth column according to the actual situation;
step S9: a rectangular coordinate system is established, the origin of the coordinate system is positioned at one half of the horizontal distance between the outer ring contour line and the middle ring contour line of the upper cover, namely y0At the position/2, the curve between the outer ring contour line and the middle ring contour line is known as y (x), the spherical centers of the spherical bulges are all on y (x), and the horizontal distance between the spherical bulge at the K-th row and the spherical bulge at the (K-1) row is lkThe first column of spherical bumps is at the origin;
Figure BDA0003404771480000034
Figure BDA0003404771480000035
in the formula: d is the diameter of the spherical bulge of the outer ring of the upper cover, mm; c. C1-the chord length of the outer ring contour of the upper cover, m; z — dimensionless coefficient; g-acceleration of gravity, m2/s；t1The ring contour line of the upper cover has the maximum thickness of m; v-speed of the pod in the water, m/s; h, the depth of the gravity center of the air guide sleeve from the water surface is m; xk-1-column k-1 coordinate values on the X axis; a. theUpper coverTotal area of the dome cover in the top view direction, m2；AOuter ringArea of the middle ring region of the dome upper cover, m2；
Step S10: and carrying out numerical simulation verification on the noise reduction effect of the bionic air guide sleeve.
In an embodiment of the invention, the flow field data includes external wall pressure, speed and wall mean shear stress, and the acoustic simulation of the prototype air guide sleeve and the bionic air guide sleeve is performed on the prototype air guide sleeve and the bionic air guide sleeve under different frequencies by using finite element analysis.
In an embodiment of the invention, the middle section of the air guide sleeve is a straight cylindrical stretching section, and the air guide sleeve bottom cabin is formed by rotating a section curve of the middle section of the air guide sleeve in the horizontal direction by a half circle around a central axis.
In an embodiment of the invention, the center of the first row of spherical centers of the middle section of the nacelle in the head-to-tail direction is at the origin of coordinates, and if the functional expression of the horizontal section line of the middle section of the nacelle is known as f (x), then f' (x) is the slope of a tangent line at a certain point.
In one embodiment of the present invention, the dome lobes of the nacelle bottom are arranged in a manner that: dividing a plurality of cross sections on the air guide sleeve along the direction from the head part to the tail part of the air guide sleeve, wherein the distance between the kth cross section and the (k-1) th cross section in the side projection is pk, and the distance pk between the kth row of spherical convex centers and the (k-1) th row of spherical convex centers in the side projection in the direction from the head part to the tail part of the middle section of the air guide sleeve is the same as the distance pk; the spherical protrusions are uniformly arranged on the section line of the cross section along the circumference, and the centers of the spheres are all on the section line.
In an embodiment of the invention, the upper cover of the air guide sleeve is divided into an upper cover outer ring, a middle ring and an inner ring, the middle ring of the upper cover is higher than the outer ring, and the inner ring occupies the area of a part of the middle ring, so that the occupied part cannot be provided with the spherical bulge.
Compared with the prior art, the technical scheme of the invention has the following advantages: the invention provides a bionic structure design method for enabling a sonar air guide sleeve to have noise reduction performance, and the air guide sleeve with the bionic structure can be designed through the design method, so that the interference of flow-induced noise on sonar signals is reduced, and the accuracy of the signals is improved.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings.
FIG. 1 is a schematic view of a prototype pod assembly;
FIG. 2 is a schematic horizontal section line view of the mid-section of the pod;
FIG. 3 is a rear view of the pod;
FIG. 4 is a schematic view of a biomimetic pod;
FIG. 5 is a schematic view of a pod side projection;
FIG. 6 is a schematic view of horizontal section line coordinates of a mid-section of the pod;
FIG. 7 is a schematic view of the arrangement of the cross-sectional spherical protrusions at the bottom of the pod;
FIG. 8 is a schematic diagram of the upper lid region division;
FIG. 9 is a schematic view of the arrangement of the spherical protrusions in the upper cover of the dome;
fig. 10 is a schematic view of the arrangement of spherical protrusions on the outer ring of the upper cover of the guide cover.
As shown, 1, upper cover, 2, middle section, 3, bottom.
Detailed Description
As shown in fig. 1, the present embodiment provides a dome for bionic design, and the specific parameters thereof are as follows: 2300mm of the dome chord length c, 760mm of the width t, 20n mile/h of the velocity V (i.e. 10.28m/s), and 0.1819m of the total volume V of the dome3The working depth H is 5 m. Surface area A of the upper cover of the air guide sleeveUpper cover＝0.4117m2Middle section surface area AMiddle section＝0.8197m2Surface area of the bottom compartment ABottom cabin＝0.7434m2，AGeneral assembly＝1.9748m2The length h of the middle section is 300 mm. Density rho of liquid 1000kg/m3Dynamic viscosity coefficient u of water at 25 ═ 0.9 x 10-6m2/s。
Step S1: keeping the main body shape and structure of the prototype air guide sleeve unchanged, and carrying out numerical simulation on flow field data of the prototype air guide sleeve;
step S2: performing bionic structure design on the outer surface of the prototype air guide sleeve;
step S3: diameter d of spherical projection in mm
Figure BDA0003404771480000051
Figure BDA0003404771480000052
Figure BDA0003404771480000053
Step S4: the distance n of the center of the first row of spherical protrusions from the upper side projection line of the air guide sleeve along the upper part to the lower part direction of the middle section of the air guide sleeve is unit mm
Figure BDA0003404771480000054
Step S5: as shown in the combined figure 2, the distance from the k column spherical convex center of the middle section of the air guide sleeve along the head-to-tail direction to the (k-1) column spherical convex center of the air guide sleeve in the side projection is pkIn mm. As shown in fig. 6, a rectangular coordinate system is established, the spherical centers of the first row of spherical centers are located at the original coordinate point, and if the function expression of the horizontal section line of the middle section of the nacelle is f (x), f' (x) is the slope of the tangent line at a certain point of the dome
Figure BDA0003404771480000055
Figure BDA0003404771480000056
Figure BDA0003404771480000057
Figure BDA0003404771480000058
Figure BDA0003404771480000059
Figure BDA00034047714800000510
Figure BDA00034047714800000511
Figure BDA00034047714800000512
Figure BDA00034047714800000513
Figure BDA0003404771480000061
Figure BDA0003404771480000062
Figure BDA0003404771480000063
Figure BDA0003404771480000064
Figure BDA0003404771480000065
Figure BDA0003404771480000066
Figure BDA0003404771480000069
Figure BDA0003404771480000067
Step S6: the distance between two adjacent rows of spherical convex centers of the middle section of the air guide sleeve along the direction from the upper part to the lower part is j, and the unit mm is
Figure BDA0003404771480000068
Step S7: the arrangement mode of the spherical bulge at the bottom of the air guide sleeve is as follows: dividing a plurality of cross sections on the air guide sleeve along the direction from the head part to the tail part of the air guide sleeve, wherein the distance from the kth cross section to the (k-1) th cross section in the side projection is pkThe distance p between the center of the kth row of spherical protrusions and the center of the (k-1) th row of spherical protrusions in the lateral projection of the center of the kth row of spherical protrusions and the middle section of the air guide sleeve along the head-to-tail directionkAs such, as shown in fig. 5; the spherical protrusions are uniformly arranged circumferentially on the cross-sectional line of the cross-section with the centers of the spheres on the cross-sectional line, as shown in fig. 7. Taking the clockwise direction as positive, on the kth cross section, the included angle between the first and the last spherical bulge and the plane projection line on the upper side of the bottom of the flow guide cover is thetak0Unit degree; n is uniformly distributed between the first and the last spherical bulgekEach spherical bulge, the included angle between the adjacent spherical bulges is thetak(ii) a As can be seen from fig. 6 and 7, the radius R ═ f (x) of the semicircle in which the kth section line is locatedk)
Figure BDA0003404771480000071
Figure BDA0003404771480000072
Figure BDA0003404771480000073
Figure BDA0003404771480000074
Figure BDA0003404771480000075
Figure BDA0003404771480000076
Figure BDA0003404771480000077
Figure BDA0003404771480000078
Figure BDA0003404771480000079
Figure BDA00034047714800000710
Figure BDA00034047714800000711
Figure BDA00034047714800000712
Figure BDA00034047714800000713
Figure BDA00034047714800000714
Figure BDA00034047714800000715
Figure BDA00034047714800000716
Figure BDA00034047714800000717
Figure BDA00034047714800000718
Figure BDA00034047714800000719
Figure BDA00034047714800000720
Figure BDA00034047714800000721
Figure BDA00034047714800000722
Figure BDA00034047714800000723
Figure BDA00034047714800000724
Figure BDA00034047714800000725
Figure BDA00034047714800000726
Figure BDA0003404771480000081
Figure BDA0003404771480000082
Figure BDA0003404771480000083
Figure BDA0003404771480000084
Figure BDA0003404771480000085
Figure BDA0003404771480000086
The thickness of the air guide sleeve on which the plane of the 18 th row is positioned is close to the diameter of the spherical bulge, so that interference is easy to cause, and the arrangement is inconvenient;
step S8: the upper cover of the dome is divided into an upper cover outer ring, a middle ring and an inner ring, wherein the middle ring of the upper cover is higher than the outer ring by a part, as shown in fig. 8, the inner ring occupies the area of a part of the middle ring, so that the occupied part cannot be provided with the spherical bulge. As shown in FIG. 9, a rectangular coordinate system is established, the function of the middle ring contour line above the X-axis is g (X), and the distance from the first row of spherical protrusions to the origin along the head-to-tail direction is a0The distance between the spherical bulge of the kth column and the (k-1) th column is bkThe number of the spherical bulges in the kth column is Mk；
Figure BDA0003404771480000087
Figure BDA0003404771480000088
Figure BDA0003404771480000089
Figure BDA00034047714800000810
Figure BDA00034047714800000811
Figure BDA00034047714800000812
Figure BDA00034047714800000813
Figure BDA00034047714800000814
Figure BDA00034047714800000815
Figure BDA00034047714800000816
Figure BDA00034047714800000817
Figure BDA00034047714800000818
Figure BDA00034047714800000819
Figure BDA00034047714800000820
Figure BDA00034047714800000821
Figure BDA0003404771480000091
Figure BDA0003404771480000092
Figure BDA0003404771480000093
Figure BDA0003404771480000094
Figure BDA0003404771480000095
Figure BDA0003404771480000096
Figure BDA0003404771480000097
Figure BDA0003404771480000098
Figure BDA0003404771480000099
Figure BDA00034047714800000910
Figure BDA00034047714800000911
Figure BDA00034047714800000912
Figure BDA00034047714800000913
Figure BDA00034047714800000914
Figure BDA00034047714800000915
Step S9: as shown in FIG. 10, a rectangular coordinate system is established, and the origin of the coordinate system is located at a position half of the horizontal distance between the outer ring contour line and the middle ring contour line of the upper cover, i.e. y0At/2, the curve between the outer ring contour line and the middle ring contour line is known as y (x), and the spherical centers of the spherical bulges are all on y (x). The horizontal distance between the spherical center bulge of the K-th row and the spherical bulge of the (K-1) row is lkThe first column of spherical bumps is at the origin;
Figure BDA00034047714800000916
Figure BDA00034047714800000917
Figure BDA00034047714800000918
Figure BDA00034047714800000919
Figure BDA00034047714800000920
Figure BDA00034047714800000921
Figure BDA00034047714800000922
Figure BDA00034047714800000923
Figure BDA0003404771480000101
Figure BDA0003404771480000102
Figure BDA0003404771480000103
Figure BDA0003404771480000104
Figure BDA0003404771480000105
Figure BDA0003404771480000106
Figure BDA0003404771480000107
step S10: the noise reduction effect of the bionic air guide sleeve is verified through numerical simulation, the noise reduction effect of the air guide sleeve with the spherical convex structure is obvious for medium-high frequency noise, and the reduction range of the maximum sound pressure level value is 58-67 dB. When the pit-type air guide sleeve is in 10000Hz, the maximum sound pressure level value is reduced by 1dB, the maximum sound pressure level values of other frequencies are not reduced, but the sound pressure levels on the two sides of the pit-type air guide sleeve cabin are distributed uniformly, and no area with a higher sound pressure level value is formed.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims (6)

1. The utility model provides a bionical type kuppe design method with function of making an uproar is fallen, prototype kuppe include upper cover (1), middle section (2), under deck (3), upper cover (1), middle section (2), under deck (3) surface evenly arrange spherical protruding to reach the effect that reduces the surface flow noise acoustic pressure intensity of kuppe in the in-process of marcing, its characterized in that includes following step:
step S1: keeping the main body shape and structure of the prototype air guide sleeve unchanged, and carrying out numerical simulation on flow field data of the prototype air guide sleeve;
step S2: performing bionic structure design on the outer surface of the prototype air guide sleeve;
step S3: given the defined spherical lobe diameter d,
Figure FDA0003404771470000011
in the formula: u-dynamic viscosity coefficient of water at 25 ℃ of 0.9 x 10-6m2S; rho-density of liquid, kg/m3；AGeneral assemblyTotal area of dome casing, m2(ii) a v-speed of the pod in the water, m/s; a-area of plane or curved surface of the portion where the spherical projection is located, m2(ii) a V-total volume of the dome, m3(ii) a c-the chord length of the cross section line of the air guide sleeve, m; t is the maximum thickness of the section, m; tau is0-mean shear stress, Pa, of the dome outer wall surface where the spherical protrusion is located;
step S4: the distance between the center of a first row of spherical convex spheres of the middle section (2) of the air guide sleeve along the direction from the upper part to the lower part and the projection line of the upper side surface of the air guide sleeve is defined as n, the unit is mm,
Figure FDA0003404771470000012
in the formula: d-spherical bulge diameter, mm; g-acceleration of gravity, m2S; h is the height of the middle section of the air guide sleeve, m; h, the depth of the gravity center of the air guide sleeve from the water surface is m; v-total pod volume, m 3; v-speed of the pod in the water, m/s;
step S5: the distance between the center of the k-th row of spherical protrusions in the head-to-tail direction of the middle section of the air guide sleeve and the side projection of the center of the (k-1) -th row of spherical protrusions in mm is defined as pk,
Figure FDA0003404771470000013
in the formula: d-spherical bulge diameter, mm; c-the chord length of the cross section line of the air guide sleeve, m; t is the maximum thickness of the section, m; g-acceleration of gravity, m2S; t is the maximum thickness of the section, m; v-speed of the pod in the water, m/s; a, taking a value of 1-10 as a dimensionless constant; h, the depth of the gravity center of the air guide sleeve from the water surface is m;
step S6: the distance between the centers of two adjacent rows of spherical bulges in the direction from the upper part to the lower part of the middle section (2) of the air guide sleeve is defined as j, the unit mm,
Figure FDA0003404771470000014
in the formula: d-spherical bulge diameter, mm; h is the height of the middle section of the air guide sleeve, m; c-the chord length of the cross section line of the air guide sleeve, m; b*-a dimensionless constant, valued at t/c-3; n is the distance between the center of the first row of spherical protrusions in the middle section of the air guide sleeve along the direction from the upper part to the lower part and the side projection line on the upper part of the air guide sleeve, and is mm;
step S7: taking the clockwise direction as positive, on the kth cross section, the included angle between the first and the last spherical bulge and the plane projection line on the upper side of the bottom of the flow guide cover is thetak0Unit degree; n is uniformly distributed between the first and the last spherical bulgekEach spherical bulge, the included angle between the adjacent spherical bulges is thetak；
Figure FDA0003404771470000021
C is the chord length of the section line of the air guide sleeve, m; tau iskThe average shear stress of the kth cross section at the bottom of the dome is obtained by numerical simulation to obtain a value pa; rho-density of liquid, kg/m3；
Figure FDA0003404771470000022
In the formula, N isIs a dimensionless coefficient in the range of 1-10 eRk；Xk-the kth cross section is plotted on the abscissa in the coordinate system shown in fig. 6; x0-f (x) the coordinate value of x at the maximum value; rk-the kth cross-sectional line radius, m;
therefore, the temperature of the molten steel is controlled,
Figure FDA0003404771470000023
step S8: a rectangular coordinate system is established, the function of the middle ring contour line above the X axis is g (X), and the distance from the first row of spherical bulges to the origin along the direction from the head to the tail is a0The distance between the spherical bulge of the kth column and the (k-1) th column is bkThe number of the spherical bulges in the kth column is Mk；
Figure FDA0003404771470000024
D-the diameter of the spherical bulge positioned in the middle ring of the upper cover is mm; c. C0The chord length of the ring contour line m of the upper cover; t is t0The ring contour line of the upper cover has the maximum thickness of m; v-speed of the pod in the water, m/s; tau is0-ring mean shear stress in the upper lid, Pa; rho-density of liquid, kg/m3(ii) a u-dynamic viscosity coefficient of water at 25 ℃ of 0.9 x 10-6m2/s；
Figure FDA0003404771470000025
Figure FDA0003404771470000026
In the formula: d-the diameter of the spherical bulge in the upper cover is mm; c. C0The chord length of the ring contour line m of the upper cover; c. C*-a dimensionless coefficient; g-acceleration of gravity, m2/s；t0Middle ring outline of the upper coverLarge thickness, m; v-speed of the pod in the water, m/s; h, the depth of the gravity center of the air guide sleeve from the water surface is m; xk-1-column k-1 coordinate values on the X axis; a. theUpper coverTotal area of the dome cover in the top view direction, m2；AMiddle ringArea of the middle ring region of the dome upper cover, m2；
Figure FDA0003404771470000031
In the formula: d is the diameter of the spherical bulge in the middle ring of the upper cover, mm; m is*-dimensionless coefficients with a value range of 1-3; xk-column k coordinate value on the X axis; w is related to the thickness value of the inner ring of the upper cover on the kth column according to the actual situation;
step S9: a rectangular coordinate system is established, the origin of the coordinate system is positioned at one half of the horizontal distance between the outer ring contour line and the middle ring contour line of the upper cover, namely y0At the position/2, the curve between the outer ring contour line and the middle ring contour line is known as y (x), the spherical centers of the spherical bulges are all on y (x), and the horizontal distance between the spherical bulge at the K-th row and the spherical bulge at the (K-1) row is lkThe first column of spherical bumps is at the origin;
Figure FDA0003404771470000032
Figure FDA0003404771470000033
in the formula: d is the diameter of the spherical bulge of the outer ring of the upper cover, mm; c. C1-the chord length of the outer ring contour of the upper cover, m; z — dimensionless coefficient; g-acceleration of gravity, m2/s；t1The ring contour line of the upper cover has the maximum thickness of m; v-speed of the pod in the water, m/s; h, the depth of the gravity center of the air guide sleeve from the water surface is m; xk-1-column k-1 coordinate values on the X axis; a. theUpper cover-air guide sleeveTotal area of the upper cover in the overlooking direction, m2；AOuter ringArea of the middle ring region of the dome upper cover, m2；
Step S10: and carrying out numerical simulation verification on the noise reduction effect of the bionic air guide sleeve.
2. The design method of the bionic type air guide sleeve with the noise reduction function according to claim 1, characterized in that: the flow field data comprises the pressure intensity of the outer wall surface, the speed and the average shear stress of the wall surface, and the acoustic simulation of the prototype air guide sleeve and the bionic air guide sleeve under different frequencies is carried out by utilizing finite element analysis.
3. The design method of the bionic type air guide sleeve with the noise reduction function according to claim 1, characterized in that: the middle section (2) of the air guide sleeve is a section of straight cylinder stretching section, and the bottom cabin (3) of the air guide sleeve is formed by rotating a section curve of the middle section of the air guide sleeve in the horizontal direction for a half circle around a central axis.
4. The design method of the bionic type air guide sleeve with the noise reduction function according to claim 1, characterized in that: the center of a first row of spherical centers of the middle section of the air guide sleeve in the direction from the head to the tail is at the original coordinate point, and if the function expression of the horizontal section line of the middle section of the air guide sleeve is known to be f (x), f' (x) is the slope of a tangent line of a certain point.
5. The design method of the bionic type air guide sleeve with the noise reduction function according to claim 1, characterized in that: the spherical bulge arrangement mode of the bottom cabin (3) of the air guide sleeve is as follows: dividing a plurality of cross sections on the air guide sleeve along the direction from the head part to the tail part of the air guide sleeve, wherein the distance from the kth cross section to the (k-1) th cross section in the side projection is pkThe distance p between the center of the kth row of spherical protrusions and the center of the (k-1) th row of spherical protrusions in the lateral projection of the center of the kth row of spherical protrusions and the middle section of the air guide sleeve along the head-to-tail directionkThe same; the spherical protrusions are uniformly arranged on the section line of the cross section along the circumference, and the centers of the spheres are all on the section line.
6. The design method of the bionic type air guide sleeve with the noise reduction function according to claim 4, characterized in that: the upper cover (1) of the air guide sleeve is divided into an outer ring, a middle ring and an inner ring of the upper cover, wherein the middle ring of the upper cover is higher than the outer ring, and the inner ring occupies the area of a part of the middle ring, so that the occupied part cannot be provided with the spherical bulge.
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