CN114357602A - Design method, device and equipment of propeller - Google Patents
Design method, device and equipment of propeller Download PDFInfo
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Abstract
The disclosure discloses a design method of a propeller, and belongs to the field of blade design. The design method comprises the following steps: determining input parameters, and calculating to obtain geometric parameters according to the input parameters, wherein the geometric parameters comprise the rotating speed of a propeller, the disc surface ratio of the propeller, the average pitch of the propeller, and the pitch, chord length, sideslip and maximum section thickness of the propeller under different blade heights; establishing a geometric model of the propeller according to the geometric parameters; performing optimization simulation on the geometric model to obtain a plurality of groups of output parameters, wherein the output parameters comprise thrust and torque of the full-rotation duct type steering oar at different rotating speeds of the propeller; according to the output parameters, performing performance analysis on the geometric model to obtain design parameters; and designing the propeller according to the design parameters. According to the design method, the design period of the full-rotation ducted propeller can be shortened.
Description
Technical Field
The disclosure belongs to the field of propeller design, and particularly relates to a propeller design method, device and equipment.
Background
The propeller belongs to the core component of the full-rotation duct type rudder propeller. The full-rotation duct type rudder propeller mainly generates thrust through rotation of the propeller, so that the ship is pushed to sail. Compared with the traditional steering oar, the full-rotation duct type steering oar can rotate in all directions by 360 degrees, so that the blades of the full-rotation duct type steering oar also have underwater attachments which do not exist in the conventional steering oar, namely, the propeller is not only positioned underwater in the steering oar, but also other structures are positioned underwater, and more factors need to be considered in the design of the blades of the full-rotation duct type steering oar.
In the related art, the design method of the blades of the full-rotation duct type rudder propeller mainly adopts a conventional map design method. The so-called atlas design method is to perform an open water test according to a model of the blade (the open water test is generally carried out by mounting the model of the propeller on a propeller model water-flowing power instrument which is driven by a trailer to advance for testing), then drawing various specialized atlases according to data obtained by the open water test, and then designing the blade according to the atlases.
However, for the propeller of the fully-revolving ducted rudder propeller, the fully-revolving ducted rudder propeller can rotate in all directions by 360 degrees, so that the test period is long and the design cost is high when the water flowing test is performed, so that the design efficiency of the propeller blade is low, and the requirement of rapid manufacturing cannot be met.
Disclosure of Invention
The embodiment of the disclosure provides a design method, a device and equipment of a propeller, which can shorten the design period of the propeller of a full-rotation duct type rudder propeller. The technical scheme is as follows:
the embodiment of the disclosure provides a design method of a propeller, wherein the propeller is applied to a full-slewing duct-type rudder propeller of a ship, and the design method comprises the following steps: determining input parameters comprising a diameter of the propeller, a draft of the propeller, a number of blades of the propeller, an input power of a main machine of the full-swing duct type rudder propeller, and a maximum speed of the ship; calculating to obtain geometric parameters according to the input parameters, wherein the geometric parameters comprise the rotating speed of the propeller, the disc surface ratio of the propeller, the average pitch of the propeller, and the pitch, chord length, sideslip and maximum section thickness of the propeller under different radiuses; establishing a geometric model according to the geometric parameters; performing optimization simulation on the geometric model to obtain a plurality of groups of output parameters, wherein the output parameters comprise thrust and torque of the full-rotation duct type steering oar at different rotating speeds of the propeller; according to the output parameters, performing performance analysis on the geometric model to obtain design parameters; and designing the propeller according to the design parameters.
In yet another implementation of the present disclosure, the rotational speed of the propeller satisfies the following equation:
wherein N is the rotating speed of the propeller, P is the input power of the propeller, and D is the diameter of the propeller.
In yet another implementation of the present disclosure, the pitch of the propeller at different radii and the average pitch of the propeller satisfy the following formula:
wherein HrThe pitches of the propellers are different in radius; hmeanIs the average pitch of the propeller; k1, K2, K3 and K4 are dimensionless empirical parameters; r is half of the diameter of the propeller, and R is different radiuses of the propeller.
In yet another implementation of the present disclosure, the cross-sectional maximum thickness of the propeller at different radii and the diameter of the propeller satisfy the following formula:
wherein, tmax rThe maximum thickness of the section of the propeller under different radiuses; d is the diameter of the propeller; k5, K6, K7 and K8 are dimensionless empirical parameters; r is half of the diameter of the propeller, and R is different radiuses of the propeller.
In another implementation manner of the present disclosure, the performing a performance analysis on the geometric model according to the output parameters to obtain design parameters includes: according to the output parameters, the open water performance of the rudder propeller is obtained; analyzing the geometric model according to ship-machine-propeller matching according to the open water performance of the steering oar to obtain a ship-machine-propeller performance matching graph of the steering oar; judging whether the geometric model meets the target design requirement or not according to the ship-machine-oar performance matching graph of the steering oar; if the geometric model meets the target design requirement, taking the geometric parameters corresponding to the geometric model as the design parameters; and if the geometric model does not meet the design requirements, readjusting the geometric model, and performing optimization simulation and performance analysis on the updated geometric model again.
In another implementation manner of the present disclosure, the determining whether the geometric model meets a target design requirement according to the ship-machine-propeller performance matching graph of the rudder propeller includes:
if the difference value between the actual rotating speed corresponding to the geometric model at the maximum navigational speed and the rotating speed in the geometric parameters of the propeller is within a set range, and the error between the actual input power of the host corresponding to the geometric model at the maximum navigational speed and the input power of the host in the input parameters is within the set range, the geometric model meets the target design requirement; and if the difference value between the actual rotating speed corresponding to the geometric model at the maximum navigational speed and the rotating speed in the geometric parameters of the propeller is not in the set range, or the difference value between the actual input power of the host corresponding to the geometric model at the maximum navigational speed and the input power of the host in the input parameters is not in the set range, the geometric model does not meet the target design requirement.
In yet another implementation manner of the present disclosure, there is also provided a design apparatus of a propeller, the design apparatus being based on the design method described above, the design apparatus including: the system comprises an input parameter determining module, a control module and a control module, wherein the input parameter determining module is used for determining input parameters, and the input parameters comprise the diameter of a propeller, the draught depth of the propeller, the number of blades of the propeller, the input power of a main machine of a full-rotation duct type rudder propeller and the maximum navigational speed of a ship; the geometric parameter determining module is used for calculating and obtaining geometric parameters according to the input parameters, wherein the geometric parameters comprise the rotating speed of the propeller, the disc surface ratio of the propeller, the average pitch of the propeller, and the pitch, chord length, sideslip and section maximum thickness of the propeller under different radiuses; the geometric model obtaining module is used for establishing a geometric model of the propeller according to the geometric parameters; the output parameter determination module is used for performing optimization simulation on the geometric model to obtain a plurality of groups of output parameters, and the output parameters comprise thrust and torque of the full-rotation duct type rudder propeller at different rotating speeds; and the design parameter determining module is used for performing performance analysis on the geometric model according to the output parameters to obtain design parameters. And the propeller design module is used for designing the propeller according to the design parameters.
In yet another implementation of the disclosure, the determination module of the geometric parameter is configured to determine the rotation speed of the propeller according to the following formula:
wherein N is the rotating speed of the propeller, P is the input power of the propeller, and D is the diameter of the propeller.
In yet another implementation of the present disclosure, there is also provided a computer device comprising a processor and a memory configured to store processor-executable instructions; the processor is configured to perform the propeller design method described above.
In yet another implementation of the present disclosure, a computer storage medium is also provided, having computer instructions stored thereon, which when executed by a processor, implement the above-described propeller design method.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
when the propeller is designed by the propeller design method provided by the embodiment of the disclosure, the method obtains the geometric parameters through the input parameters of the propeller, then obtains the geometric model by using the geometric parameters, performs optimization simulation on the geometric model to obtain the output parameters corresponding to the geometric model, performs performance analysis according to the output parameters, and finally obtains the design parameters of the propeller, so that the design parameters of the propeller can meet the actual requirements, and meanwhile, the water flowing test does not need to be designed, thereby avoiding the problems of long propeller design period and high cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a propeller provided in an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method for designing a propeller provided by embodiments of the present disclosure;
FIG. 3 is a flow chart of another method for designing a propeller provided by embodiments of the present disclosure;
FIG. 4 is an open water characteristic graph of a fully slewing pipe type rudder paddle according to an embodiment of the present disclosure;
fig. 5 is a ship-machine-oar performance matching graph for a fully-slewing ducted rudder propeller provided by an embodiment of the present disclosure;
FIG. 6 is a block diagram of a design for a propeller according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a computer device according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
For the purpose of clearly explaining the design method of the propeller provided by the embodiment of the present disclosure, the related knowledge of the propeller is briefly explained in advance.
Fig. 1 is a schematic structural diagram of a propeller provided by an embodiment of the present disclosure, and in conjunction with fig. 1, the propeller includes a plurality of blades (only one blade is shown in fig. 1), wherein the blades of the propeller are connected to an outer wall of a hub of the propeller, and the blades of the propeller are in a fan-shaped spiral shape. Wherein, the straight line L is the reference line of the propeller, and the curve b in the middle of the propeller is the side slope line of the propeller.
The arc line a is a plurality of concentric arcs taking the center of the propeller hub as the center of a circle, and the radius corresponding to each arc is the different radius r of the propeller. The maximum radius R of the propeller is the maximum value of different radii R of the propeller, and the maximum radius R of the propeller is half of the diameter of the propeller.
The blade height of the propeller is the ratio of different radii r to the maximum radius. And an arc line segment AB obtained after each concentric arc a is intersected with the edge of the propeller is the chord length C of the propeller. The distance between the lateral slant line and the reference line is the lateral slant of the propeller. Angle alpha is a side bevel angle.
The maximum thickness of the section of the propeller is the maximum thickness of a corresponding plane after the propeller is cut along the direction parallel to the central axis of the propeller hub.
The pitch of the propeller is the distance of the propeller advancing along the axial direction of the propeller hub after rotating for one circle.
The disk surface ratio of the propeller is the ratio of the sum of the areas of the propeller blades after the blades are approximately flattened to the maximum outer circle area of the propeller.
The embodiment of the present disclosure provides a design method of a propeller, as shown in fig. 2, the design method includes:
s201: determining input parameters, wherein the input parameters comprise the diameter of the propeller, the draught depth of the propeller, the number of blades of the propeller, the input power of a main machine of the full-rotation duct type rudder propeller and the maximum sailing speed of the ship.
The input parameter is a theoretical value of the propeller to be designed, namely a known value.
The draft of the propeller is the depth of the center of the propeller under water.
S202: and calculating to obtain geometric parameters according to the input parameters, wherein the geometric parameters comprise the rotating speed of the propeller, the disc surface ratio of the propeller, the average pitch of the propeller, and the pitch, chord length, sideslip and maximum section thickness of the propeller under different radiuses.
S203: and establishing a geometric model according to the geometric parameters.
S204: and performing optimization simulation on the geometric model to obtain a plurality of groups of output parameters, wherein the output parameters comprise thrust and torque of the full-rotation duct type steering oar at different rotating speeds of the propeller.
S205: and performing performance analysis on the geometric model according to the output parameters to obtain design parameters.
S206: and designing the propeller according to the design parameters.
When the propeller is designed by the propeller design method provided by the embodiment of the disclosure, the method obtains the geometric parameters through the input parameters of the propeller, then obtains the geometric model by using the geometric parameters, performs optimization simulation on the geometric model to obtain the output parameters corresponding to the geometric model, performs performance analysis according to the output parameters, and finally obtains the design parameters of the propeller, so that the design parameters of the propeller can meet the actual requirements, and meanwhile, the water flowing test does not need to be designed, thereby avoiding the problems of long propeller design period and high cost.
Fig. 3 is a flowchart of another design method for a propeller according to an embodiment of the present disclosure, where in conjunction with fig. 3, the design method includes:
s301: determining input parameters, wherein the input parameters comprise the diameter of the propeller, the draught depth of the propeller, the number of blades of the propeller, the input power of a main machine of the full-rotation duct type rudder propeller and the maximum sailing speed of the ship.
In the present embodiment, the input parameters of the propeller are given according to the overall ship, wherein the number of blades of the propeller is 4.
S302: and calculating to obtain geometric parameters according to the input parameters, wherein the geometric parameters comprise the rotating speed of the propeller, the disc surface ratio of the propeller, the average pitch of the propeller, and the pitch, chord length, sideslip and maximum section thickness of the propeller under different radiuses.
In addition, according to a propeller cavitation calculation method of sections 6 to 5 registered in the book of the ship principle (the main edition of the Sheng Sha Pong and Liu Hui), the disk surface ratio Ae/Ao of the full-circle-turning duct type rudder propeller is determined based on a Berry limit line method.
In this embodiment, the geometrical parameters of the propeller are obtained in the following manner.
(1) The rotation speed of the propeller satisfies the following formula.
Wherein, P is the input power of the propeller, the unit is kW, D is the diameter of the propeller, the unit is m, N is the rotating speed of the propeller, and the unit is rpm.
In this embodiment, the input power of the propeller is the output power of the host machine received by the propeller.
In order to make the calculated rotation speed of the propeller match the transmission ratio (i.e., reduction ratio) of the speed reduction mechanism of the ship, it is generally necessary to correct the calculated rotation speed. During correction, rounding correction (namely, according to a rounding method) can be adopted, so that the corrected rotating speed can meet the actual requirement.
(2) The following formula is satisfied between the screw pitches of the screw propellers at different radiuses and the average screw pitch of the screw propellers:
wherein HrIs a helixThe pitch of the paddles at different radii; hmeanIs the average pitch of the propeller; k1, K2, K3 and K4 are dimensionless empirical parameters; r is half the diameter of the propeller and R is the different radii of the propeller. And R/R is different blade heights of the propeller.
K1, K2, K3 and K4 are respectively 0.68, 0.71, 0.06 and-0.51. R/R is in the range of [0.2,1]
Mean pitch H of the propellermeanThe calculation is carried out according to the terminating design method of the atlas method of the Kaplan catheter oar of sections 8-5 under the book of the Ship principles (the master compilation of Sheng Sha bang and Liu Yin). Firstly, obtaining the average pitch ratio H of the propellermeanD, then calculating the average pitch H of the propeller according to the diameter of the propeller in the input parametersmean。
According to empirical formula (2) and average pitch HmeanThe pitch H of the propeller at different radii (i.e. different blade heights) can be calculatedr。
(3) The maximum thickness of the section of the propeller under different radiuses and the diameter of the propeller meet the following formula:
wherein, tmax rThe maximum thickness of the section of the propeller under different radiuses; d is the diameter of the propeller; k5, K6, K7 and K8 are dimensionless empirical parameters; r is half of the diameter of the propeller, and R is different radiuses of the propeller; and R/R is different blade heights of the propeller.
In this embodiment, K5, K6, K7 and K8 are 0.209, -0.575, -0.65 and-0.267 respectively. The range of R/R is [0.2,1 ].
According to the formula (3), and t of 0.25 and 0.6 for R/R in CCS Steel Marine vessel Advance and construction Specification (2012)maxThe t of the section thickness of the propeller under different radiuses is calculatedmax rThe numerical value of (c).
Illustratively, the profile of the propeller is based on the distribution law of the NACA 66mod airfoil, with specific parameters as shown in table 1.
TABLE 1 NACA 66mod Airfoil relevant parameters
Wherein, in table 1, x is the position of any point on the lower chord lengths with different radii; c is the chord length under different radii; t is the profile thickness at different radii and f is the camber at different radii.
The section of the propeller can be designed according to the maximum thickness of the section of the propeller under different radiuses and the requirements of classification society.
(4) The disc surface ratio Ae/AO of the propeller is calculated according to the Bailey limit line checked by section 6-5 vacuoles under the book of Ship principles (Sheng Sha bang, Liu Yin Zhong).
(5) The chord length of the propeller under different radii and the sideslip of the propeller under the radius blade height are determined according to the prior experience and a map design method.
For example, the chord length of the propeller under different radii is firstly obtained according to the model and experience of the existing propeller, and the distribution rule of the chord length ratio (the ratio of the chord length to the diameter of the propeller, C/D) of the propeller under the corresponding disc surface ratio along the radial direction R/R (different blade heights) is shown in table 2.
TABLE 2 chord length ratio (in mm) of propeller at different blade heights
And then calculating the chord length of the propeller under different blade heights according to the diameter of the propeller and the disc surface ratio Ae/Ao obtained by calculation in the table 2, and obtaining the chord length of the propeller under different radii.
Similarly, the pitch of the propeller at different blade heights is also according to the method, and firstly, according to the model and experience of the existing propeller, the distribution rule of the pitch ratio (the ratio of the pitch to the diameter of the propeller, S/D) of the propeller along the radial direction R/R (different blade heights) is obtained, as shown in table 3.
TABLE 3 side slope ratio of propeller at different blade heights (unit is mm)
Then, according to the table 3 and the given side Skew angle Skew, the radial distribution of the propeller under different blade heights is calculated, namely the side Skew of the propeller under different radii is obtained.
The side pitch angle of the propeller is generally not more than 25 deg., and in this embodiment the side pitch angle Skew is 23 deg..
S303: and establishing a geometric model according to the geometric parameters.
In this embodiment, the calculated relevant geometric parameters of the propeller include the pitch H of the propeller at different radiirSection chord length Cr, section maximum thickness tmax rSide slope SrAnd the diameter D of the propeller and the like, and completing the geometric modeling of the propeller.
S304: and performing optimization simulation on the geometric model to obtain a plurality of groups of output parameters, wherein the output parameters comprise thrust and torque of the full-rotation duct type steering oar at different rotating speeds of the propeller.
The output parameters are used for judging the open water performance of the full-rotation duct type rudder propeller.
Illustratively, the geometric model is subjected to hydrodynamic optimization simulation by using a CFD (Computational Fluid Dynamics) method.
In this embodiment, ANSYS CFX 17.0 software is used for simulation calculation. The calculation model of the open water performance of the full-rotation duct type rudder propeller comprises an appendage of the rudder propeller, an infinite sea area and an underwater hull model. The model of the infinite sea water area is a cuboid model, the length, the width and the height of the model are respectively greater than 20D, 15D and 8D, wherein D is the diameter of the propeller.
The calculation model of the open water performance of the full-rotation duct type rudder propeller is divided into calculation grids through ANSYS IcemCFD 17.0, unstructured grids are adopted, boundary layer grids are added to the surfaces of the propeller and an appendage, and the grid division of the geometric model follows the following table.
TABLE 4 grid division table of geometric model
The method comprises the steps of adopting Steady static calculation, selecting a k-omega SST model by a turbulence model, selecting seawater as a fluid medium, selecting a rudder propeller as a rotating region and the rest as a static region, adopting a Forzen Rotor mode to transmit data between a dynamic interface and a static interface, selecting a Local Timescale Factor for a time step, selecting High Resolution by an interpolation mode, selecting a speed boundary for an inlet boundary of a sea water area, selecting a numerical value as a corresponding propeller water inlet speed, selecting an outlet boundary as a pressure outlet boundary, and selecting a non-viscous wall surface sliding boundary for the rest boundary of the sea water area.
After the optimization simulation calculation is completed, the thrust T of the full-rotation duct type rudder propeller and the torque Q of the full-rotation duct type rudder propeller corresponding to the propellers at different rotating speeds can be obtained, and therefore the open water performance of the full-rotation duct type rudder propeller can be obtained.
In this embodiment, in order to clearly and intuitively determine the open water performance of the fully-slewing pipe-type rudder propeller, an open water characteristic curve graph of the fully-slewing pipe-type rudder propeller may be established according to the output parameters, which may be referred to in fig. 4.
As shown in fig. 4, the abscissa of fig. 4 is the value of the propeller speed coefficient J (where J ═ Va/nD, Va denotes propeller speed (m/s); n denotes the number of revolutions of the propeller, and D denotes the diameter of the propeller), and the ordinate is the magnitude of each parameter. Wherein the curve a is a thrust coefficient curve (KT), the curve b is a torque coefficient curve (10KQ, the KQ value is too small and needs to be increased by 10 times), and the curve c is a water flowing efficiency curve.
The ship-machine-paddle matching analysis can be performed on the geometric model by using the data corresponding to the open water characteristic curve obtained above as the input value in the step S305.
S305: and analyzing the geometric model according to ship-machine-propeller matching according to the open water performance of the steering oar to obtain a ship-machine-propeller performance matching graph of the steering oar.
And according to the open water performance of the propeller calculated in the S304, completing ship-machine-propeller matching analysis according to a method provided in section 8-4 of the book of the ship principle (the master edition in Sheng Sha bang and Liu Hui).
In the embodiment, for clear and intuitive determination of the boat-machine-oar matching analysis result, a boat-machine-oar performance matching map of the full-slewing duct type rudder propeller can be established, and refer to fig. 5 (fig. 5 will be described in detail later).
S306: and judging whether the geometric model meets the target design requirement or not according to the ship-machine-paddle performance matching graph.
Step S306 includes:
3061: and if the difference value between the actual rotating speed corresponding to the geometric model at the maximum navigational speed and the rotating speed in the geometric parameters of the propeller is within the set range, and the difference value between the actual input power of the host corresponding to the geometric model at the maximum navigational speed and the input power of the host in the input parameters is within the set range, the geometric model meets the target design requirement.
In this embodiment, the setting range is generally 0 to 5.
As shown in fig. 5, the abscissa is the speed (VS) of the ship, the left ordinate is the input power (Ps) of the main engine, and the right ordinate is the rotational speed (N) of the propeller. It can be seen that when the input power of the main engine is 1800kw, the corresponding navigational speed is 7.64kn (the navigational speed satisfies the maximum navigational speed of the ship, which is the theoretical value), and the rotational speed of the propeller corresponding to the navigational speed is 280.5 (the rotational speed satisfies the rotational speed of 281rpm in the geometric parameters, which is the theoretical value), therefore, the geometric parameters corresponding to the geometric model satisfy the target design requirements.
3062: and if the difference value between the actual rotating speed corresponding to the geometric model at the maximum navigational speed and the rotating speed in the geometric parameters of the propeller is not in the set range, or the difference value between the actual input power of the host corresponding to the geometric model at the maximum navigational speed and the input power of the host in the input parameters is not in the set range, the geometric model does not meet the target design requirement.
S307: and if the geometric model meets the target design requirement, taking the geometric parameters corresponding to the geometric model as design parameters.
S308: and if the geometric model does not meet the design requirements, readjusting the geometric model, and carrying out optimization simulation and performance analysis on the updated geometric model again.
And if the geometric model does not meet the target design requirement, readjusting the geometric model, and carrying out optimization simulation performance analysis on the updated geometric model again.
And analyzing the ship-machine-paddle matching result to determine whether the calculated geometric parameters meet the target design requirements, if not, readjusting the geometric parameters, updating the geometric model, and performing optimization simulation on the updated geometric model until the geometric parameters meet the target design requirements.
S309: and designing the propeller according to the design parameters.
And after the design parameters of the propeller are obtained, the construction drawing output of the propeller can be completed, and the design is carried out according to the construction drawing.
The design method will be briefly described below with reference to specific examples.
The input parameters for the design of the full-slewing pipe-type rudder propeller of the present example are: the maximum navigational speed of the ship is 7kn, the diameter D of the propeller is 2.4m, three engines and three propellers are adopted, the input power Ps of a main engine of each propeller is 1800kW, the draft of the propeller is 4m, and the entry CCS classification society.
In addition, the hull real powers for different speeds and the corresponding wake fractions w and thrust cutoffs t are provided by the vessel as a whole, as shown in table 5.
TABLE 5 relevant parameters of ships
| Vs(kn) | 3 | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 |
| Pe(kW)2 | 139.3 | 220.8 | 318.6 | 436.7 | 584.4 | 772.2 | 1008.9 | 1296.6 | 1631.3 | 2010.5 | 2437.8 | 2920.7 |
| Wake flow w | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 |
| Thrust reduction t | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Efficiency of rotation etar | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
The number of propellers of the full-rotation duct type rudder propeller is given by the ship as a whole, and the number Z of blades of the propellers is 4.
The rotational speed N of the propeller is determined according to equation (1) and the calculation result is 281 rpm.
The disc surface ratio Ae/AO of the fully-revolving duct type rudder propeller is calculated according to the Balier limit line checked by the cavitation bubbles at sections 6-5 under the book of the ship principle (the master edition of Sheng Sha bang and Liu Hui), the calculation result is 0.68, and the actual roundness is 0.7.
Average pitch H of full-rotation guide pipe type steering oar propellermeanCalculated as described above and found 2227 mm.
According to empirical formula (2) and average pitch HmeanThe pitch H of different blade heights of the full-rotation duct type rudder propeller can be calculatedrAs shown in the table below.
TABLE 6 Pitch H of propellers of different radiir
| r/R | 1 | 0.9875 | 0.975 | 0.95 | 0.9 | 0.8 | 0.7 | 0.6 | 0.5 | 0.4 | 0.35 | 0.3 | 0.25 | 0.2 |
| Hr | 2093 | 2118 | 2142 | 2180 | 2231 | 2280 | 2292 | 2276 | 2218 | 2111 | 2038 | 1962 | 1893 | 1828 |
The chord lengths of the propellers calculated according to table 2 and the calculated disc surface ratio Ae/Ao are shown in the following table.
TABLE 7 chord length C of propeller with different radiir
| r/R | 1 | 0.9875 | 0.975 | 0.95 | 0.9 | 0.8 | 0.7 | 0.6 | 0.5 | 0.4 | 0.35 | 0.3 | 0.25 | 0.2 |
| Cr/R | 49.95 | 583.98 | 841.70 | 979.77 | 1039.94 | 1054.98 | 986.28 | 892.66 | 789.61 | 684.99 | 629.76 | 575.20 | 520.65 | 463.84 |
The radial profile of the Skew was calculated according to Table 3 and the Skew angle Skaw given, as shown in Table 8 below:
TABLE 8 sideslip S of propellers at different radiir
| r/R | 1 | 0.9875 | 0.975 | 0.95 | 0.9 | 0.8 | 0.7 | 0.6 | 0.5 | 0.4 | 0.35 | 0.3 | 0.25 | 0.2 |
| Sr | 360.0 | 332.5 | 305.7 | 258.5 | 187.7 | 70.8 | -16.9 | -57.0 | -70.1 | -52.6 | -35.6 | -16.9 | 0.1 | 15.8 |
According to equation (3), and CCS "Steel sea vessel Advance and construction Specification (2012)"T of medium pair R/R0.25 and 0.6maxAnd calculating t of the maximum thickness of the section of the propeller under different radiusesmax rThe numerical values of (A) are shown in the following table.
TABLE 9 maximum thickness t of the section of the propeller at different radiimax r
| r/R | 1 | 0.9875 | 0.975 | 0.95 | 0.9 | 0.8 | 0.7 | 0.6 | 0.5 | 0.4 | 0.35 | 0.3 | 0.25 | 0.2 |
| tmax r | 12.88 | 13.14 | 13.41 | 14.03 | 15.95 | 24.39 | 37.04 | 51.55 | 67.12 | 82.87 | 90.53 | 97.92 | 105.00 | 111.92 |
According to the obtained section thickness tmaxAnd obtaining the maximum thickness of the sections of the propeller with different radii according to the distribution rule of the NACA 66mod airfoil.
According to the geometric parameters of the propeller calculated in the process, geometric modeling can be completed.
And (3) performing optimization simulation on the geometric model by adopting a CFD (computational fluid dynamics) method to obtain the open water performance of the full-rotation duct type rudder propeller, as shown in figure 4.
According to the open water performance obtained by simulation calculation, ship-machine-paddle matching analysis is completed according to the method provided in section 8-4 of the book of ship principles (master edition in Sheng Sha bang and Liu Hui), and as shown in fig. 5, the ship-machine-paddle matching result meets the requirement of designing the navigational speed.
That is, the above design meets engineering application requirements without performing HmeanAnd (6) adjusting.
According to the design result, the drawing of the propeller construction drawing is completed according to the method provided by section 8-6 of the lower volume of the ship principle (the master edition of the Sheng-Sha nation and Liu Hui), and the subsequent processing and modeling of the propeller are completed according to the construction drawing of the full-circle-rotation duct type rudder propeller.
The embodiment of the present disclosure further provides a propeller design apparatus, as shown in fig. 6, the design apparatus is based on the above design method, and the design apparatus includes a module 601 for determining input parameters, a module 602 for determining geometric parameters, a module 603 for obtaining geometric models, a module 604 for determining output parameters, a module 605 for determining design parameters, and a propeller design module 606. The input parameter determining module 601 is used for determining input parameters, wherein the input parameters comprise the diameter of a propeller, the draught depth of the propeller, the number of blades of the propeller, the input power of a main machine of the full-rotation duct type rudder propeller and the maximum sailing speed of a ship; the geometric parameter determining module 602 is configured to calculate geometric parameters according to the input parameters, where the geometric parameters include a rotation speed of the propeller, a disc surface ratio of the propeller, an average pitch of the propeller, and a pitch, a chord length, a lateral inclination, and a maximum profile thickness of the propeller at different blade heights; a geometric model obtaining module 603, configured to establish a geometric model of the propeller according to the geometric parameters; the output parameter determining module 604 is configured to perform optimization simulation on the geometric model to obtain multiple sets of output parameters, where the output parameters include thrust and torque of the full-rotation duct-type rudder propeller at different rotation speeds; and a design parameter determining module 605, configured to perform performance analysis on the geometric model according to the output parameter to obtain a design parameter. And a propeller design module 606 for designing the propeller according to the design parameters.
The above design apparatus has all the beneficial effects of the above design method, and further description is omitted here.
Optionally, the geometric parameter determination module is further configured to calculate a rotational speed of the propeller according to equation (1).
Optionally, the geometric parameter determination module is further configured to determine the pitch of the propeller at different radii according to equation (2).
Optionally, the geometric parameter determination module is further configured to determine a cross-sectional maximum thickness of the propeller at different radii according to equation (3).
Optionally, according to the output parameters, obtaining the open water performance of the rudder propeller; analyzing the geometric model according to ship-machine-propeller matching according to the open water performance of the steering oar to obtain a ship-machine-propeller performance matching graph of the steering oar; judging whether the geometric model meets the target design requirement or not according to the ship-machine-oar performance matching graph; if the geometric model meets the target design requirement, taking the geometric parameters corresponding to the geometric model as design parameters; and if the geometric model does not meet the design requirements, readjusting the geometric model, and carrying out optimization simulation and performance analysis on the updated geometric model again.
Optionally, the design parameter determining module is further configured to, if a difference between an actual rotation speed corresponding to the geometric model at the maximum speed and a rotation speed in the geometric parameter of the propeller is within a set range, and an error between an actual input power of the host corresponding to the geometric model at the maximum speed and an input power of the host in the input parameter is within the set range, meet the target design requirement for the geometric model; and if the difference value between the actual rotating speed corresponding to the geometric model at the maximum navigational speed and the rotating speed in the geometric parameters of the propeller is not in the set range, or the difference value between the actual input power of the host corresponding to the geometric model at the maximum navigational speed and the input power of the host in the input parameters is not in the set range, the geometric model does not meet the target design requirement.
Fig. 7 is a schematic structural diagram of a computer device provided in an embodiment of the present disclosure, and in conjunction with fig. 7, the computer device 700 may include one or more of the following components: a processor 701, a memory 702, a communication interface 703, and a bus 704.
The processor 701 includes one or more processing cores, and the processor 701 executes various functional applications and information processing by executing software programs and modules. The memory 702 and the communication interface 703 are connected to the processor 701 by a bus 704. The memory 702 may be used to store at least one instruction for execution by the processor 701 to perform the various steps of the method described above.
Further, the memory 702 may be implemented by any type or combination of volatile or non-volatile storage devices, including, but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), Static Random Access Memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, programmable read-only memory (PROM).
The embodiment of the disclosure also provides a computer storage medium, and the computer instructions are executed by the processor to realize the above design method.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. A design method of a propeller applied to a full-swing duct type rudder propeller of a ship, the design method comprising:
determining input parameters comprising a diameter of the propeller, a draft of the propeller, a number of blades of the propeller, an input power of a main machine of the full-swing duct type rudder propeller, and a maximum speed of the ship;
calculating to obtain geometric parameters according to the input parameters, wherein the geometric parameters comprise the rotating speed of the propeller, the disc surface ratio of the propeller, the average pitch of the propeller, and the pitch, chord length, sideslip and maximum section thickness of the propeller under different radiuses;
establishing a geometric model according to the geometric parameters;
performing optimization simulation on the geometric model to obtain a plurality of groups of output parameters, wherein the output parameters comprise thrust and torque of the full-rotation duct type steering oar at different rotating speeds of the propeller;
according to the output parameters, performing performance analysis on the geometric model to obtain design parameters;
and designing the propeller according to the design parameters.
2. The design method according to claim 1, wherein the rotation speed of the propeller satisfies the following formula:
wherein N is the rotating speed of the propeller, P is the input power of the propeller, and D is the diameter of the propeller.
3. The design method according to claim 1, wherein the following formula is satisfied between the pitch of the propeller at different radii and the average pitch of the propeller:
wherein HrThe pitches of the propellers are different in radius; hmeanIs the average pitch of the propeller; k1, K2, K3 and K4 are dimensionless empirical parameters; r is half of the diameter of the propeller, and R is different radiuses of the propeller.
4. The design method of claim 1, wherein the maximum thickness of the propeller section at different radii and the diameter of the propeller satisfy the following formula:
wherein, tmax rThe maximum thickness of the section of the propeller under different radiuses; d is the diameter of the propeller; k5, K6, K7 and K8 are dimensionless empirical parameters; r is half of the diameter of the propeller, and R is different radiuses of the propeller.
5. The design method of claim 1, wherein the performing a performance analysis on the geometric model according to the output parameters to obtain design parameters comprises:
according to the output parameters, the open water performance of the rudder propeller is obtained;
analyzing the geometric model according to ship-machine-propeller matching according to the open water performance of the steering oar to obtain a ship-machine-propeller performance matching graph of the steering oar;
judging whether the geometric model meets the target design requirement or not according to the ship-machine-propeller performance matching graph;
if the geometric model meets the target design requirement, taking the geometric parameters corresponding to the geometric model as the design parameters;
and if the geometric model does not meet the design requirements, readjusting the geometric model, and performing optimization simulation and performance analysis on the updated geometric model again.
6. The design method according to claim 5, wherein the determining whether the geometric model meets target design requirements according to the ship-machine-oar performance matching graph of the rudder propeller comprises:
if the difference value between the actual rotating speed corresponding to the geometric model at the maximum navigational speed and the rotating speed in the geometric parameters of the propeller is within a set range, and the error between the actual input power of the host corresponding to the geometric model at the maximum navigational speed and the input power of the host in the input parameters is within the set range, the geometric model meets the target design requirement;
and if the difference value between the actual rotating speed corresponding to the geometric model at the maximum navigational speed and the rotating speed in the geometric parameters of the propeller is not in the set range, or the difference value between the actual input power of the host corresponding to the geometric model at the maximum navigational speed and the input power of the host in the input parameters is not in the set range, the geometric model does not meet the target design requirement.
7. A propeller designing apparatus based on the designing method of any one of claims 1 to 6, comprising:
the system comprises an input parameter determining module, a control module and a control module, wherein the input parameter determining module is used for determining input parameters, and the input parameters comprise the diameter of a propeller, the draught depth of the propeller, the number of blades of the propeller, the input power of a main machine of a full-rotation duct type rudder propeller and the maximum navigational speed of a ship;
the geometric parameter determining module is used for calculating and obtaining geometric parameters according to the input parameters, wherein the geometric parameters comprise the rotating speed of the propeller, the disc surface ratio of the propeller, the average pitch of the propeller, and the pitch, chord length, sideslip and section maximum thickness of the propeller under different radiuses;
the geometric model obtaining module is used for establishing a geometric model of the propeller according to the geometric parameters;
the output parameter determination module is used for performing optimization simulation on the geometric model to obtain a plurality of groups of output parameters, and the output parameters comprise thrust and torque of the full-rotation duct type rudder propeller at different rotating speeds;
and the design parameter determining module is used for performing performance analysis on the geometric model according to the output parameters to obtain design parameters.
And the propeller design module is used for designing the propeller according to the design parameters.
8. The design device of claim 7, wherein the determination module of the geometric parameter is configured to determine the rotational speed of the propeller according to the following formula:
wherein N is the rotating speed of the propeller, P is the input power of the propeller, and D is the diameter of the propeller.
9. A computer device, comprising a processor and a memory configured to store processor-executable instructions; the processor is configured to perform the method of designing a propeller of any one of claims 1 to 6.
10. A computer storage medium having computer instructions stored thereon, wherein the computer instructions, when executed by a processor, implement the method of designing a propeller of any one of claims 1 to 6.
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| CN117574551B (en) * | 2024-01-15 | 2024-04-19 | 武汉理工大学 | Design method, device and equipment of propeller and storage medium |
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