CN213566415U

CN213566415U - Pod propeller fin structure for increasing hydrodynamic performance

Info

Publication number: CN213566415U
Application number: CN202021181204.7U
Authority: CN
Inventors: 舒永东; 杜鹏; 谢堂海; 高天; 陈代明
Original assignee: Nanjing High Accurate Marine Equipment Co Ltd
Current assignee: Nanjing High Accurate Marine Equipment Co Ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-06-29
Anticipated expiration: 2030-06-23

Abstract

The utility model belongs to the technical field of pod thruster, in particular to a pod thruster fin structure for increasing hydrodynamic performance, which comprises a tail fin and two thrust fins, wherein the pod thruster comprises a lower box body, the bottom of the lower box body is connected with a motor shell, one end of the motor shell is provided with a propeller, the other end of the motor shell is provided with the tail fin, and the tail fin is of a flat cross structure; the two thrust fins are symmetrically arranged on two side walls of the motor shell and close to one end of the propeller. This practicality sets up cross tail fin at the afterbody through arranging two thrust fins on the symmetric distribution ground in nacelle propeller barrel position to and optimize the geometric parameters of fin, reduce the boats and ships resistance, reduce boats and ships yawing force, increase boats and ships propulsive efficiency.

Description

Pod propeller fin structure for increasing hydrodynamic performance

Technical Field

The utility model belongs to the technical field of the nacelle propeller, concretely relates to increase hydrodynamic performance's nacelle propeller fin structure.

Background

At present, the pod type propeller is widely applied to a diving operation supply ship, an oil drilling platform, a supply ship, a shuttle tanker, a roll-on ship, an ice breaker and a part of military ships. The pod type propeller arranges the propelling motor outside the cabin, the power of the pod type propeller is transmitted through a cable, the electric energy generated by the generator is transmitted to the motor arranged outside the cabin through the cable, and the motor directly drives the propeller to rotate to provide power for the ship.

Different from the traditional steering oar propeller, the direction of the blades of the traction type pod propeller is the same as the sailing direction, and the wake flow condition of the blades is changed to a certain extent. With the development of pod propulsion, the demand for energy saving is also increasing.

Therefore, how to bring more excellent sailing capability to the ship under the condition of a certain motor parameter is an important direction for the optimal design of the pod propeller.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a to under the certain circumstances of motor parameter, how to bring the problem of more excellent navigation performance for boats and ships, provide an increase hydrodynamic performance's nacelle propeller fin structure, through two thrust fins of arranging symmetric distribution in nacelle propeller barrel position, set up cross tail fin at the afterbody to and optimize the geometric parameters of fin, reduce the ship resistance, reduce the boats and ships yawing force, increase boats and ships propulsive efficiency.

In order to achieve the above object, the present invention provides the following technical solutions:

a fin structure of a pod propeller for improving hydrodynamic performance comprises a tail fin and two thrust fins, wherein the pod propeller comprises a lower box body, the bottom of the lower box body is connected with a motor shell, one end of the motor shell is provided with a propeller, the other end of the motor shell is provided with the tail fin, and the tail fin is of a flat cross structure; the two thrust fins are symmetrically arranged on two side walls of the motor shell and close to one end of the propeller.

Furthermore, the cross section of the middle position of the lower box body is NACA-shaped, and the cross section of the thrust fin is NACA-shaped.

Further, the tail fin length A of the tail fin is equal to the outer diameter K of the motor shell.

Further, the length B of the tail end of the tail fin is 0.2-0.4 times of the outer diameter K of the motor shell.

Further, the thickness D of the tail fin between the tail fin and the end connecting point of the motor shell is 0.1-0.2 times of the outer diameter K of the motor shell.

Further, a tail fin included angle C of the tail fin, namely an included angle between a tail fin inclined edge and the transverse central axis of the motor shell is 40-60 degrees, and preferably 50 degrees.

Further, the distance from the front edge of the thrust fin to the center of the propeller is F, and the center distance F is not more than 1/2; preferably, the center distance F is 0.4-0.5 times of the outer diameter K of the motor shell.

Further, the chord length E of the thrust fin is 1/4-1/2 times of the diameter M of the propeller; preferably 1/3 times.

Further, the thrust fin circumferential angle H of the thrust fin, i.e. the angle between the axis of the thrust fin and the longitudinal central axis of the motor housing, is 50-70 °, preferably 60 °.

Further, the thrust fin span length G of the thrust fin satisfies: g is 0.35M-0.5K; wherein: m represents the propeller diameter, and K represents the motor housing outer diameter.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model arranges two symmetrical thrust fins on the cylinder position of the pod propeller, namely the outer wall of the motor shell, and arranges a cross tail fin at the tail part; and the ship resistance is reduced, the ship lateral force is reduced, and the ship propulsion efficiency is increased by optimizing the geometric parameters of the fin plates.

The utility model discloses a combination form of thrust fin and tail fin, including the geometry optimization of fin, have outstanding effect in energy-conserving aspect, the efficiency ratio of the nacelle propeller that has the combination fin structure does not have fin nacelle propeller and exceeds 2.77%, attaches the yawing force of fin nacelle near zero under the design operating mode moreover, has improved the straight navigation performance of boats and ships, has reduced the energy resource consumption of boats and ships.

Drawings

Fig. 1 is a schematic overall structure diagram of the present invention;

fig. 2 is a front view of the present invention;

fig. 3 is a side view of the present invention;

in the figure: the propeller comprises a 1-tail fin, a 2-thrust fin, a 3-lower box body, an A-tail fin, a B-tail end, a C-tail fin included angle, a D-tail fin thickness, an E-thrust fin chord length, a distance from the front edge of the F-thrust fin to the center of the propeller, a G-thrust fin extension length, an H-thrust fin circumferential angle, a K-motor shell outer diameter and an M-propeller diameter.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: the fin plate structure comprises a tail fin 1 and two thrust fins 2, the pod propeller comprises a lower box body 3, the bottom of the lower box body 3 is connected with a motor shell, one end of the motor shell is provided with a propeller, the other end of the motor shell is provided with the tail fin 1, and the tail fin 1 is of a flat plate cross structure; the two thrust fins 2 are symmetrically arranged on two side walls of the motor shell and close to one end of the propeller.

In this embodiment, the tail fin with airfoil profile does not result in better hydrodynamic performance due to the turbulence of the tail flow field of the pod propeller. In the embodiment, the tail fin 1 is arranged at the end part of a motor shell of the pod propeller, and the thrust fins 2 are symmetrically arranged at two sides of the motor shell and are used for absorbing tail eddy current caused by rotation of the propeller; the tail fin 1 is designed into a simple flat plate cross-shaped cross structure; the closer the axial position of the thrust fin 2 is to the propeller, the greater the beneficial effect is produced; the advantages of double fins are greater than single fins, which are greater than finless. So the thrust fin 2 of the utility model is arranged symmetrically.

Further, the section of the middle position of the lower box body 3 is NACA-shaped, and the section of the thrust fin 2 is NACA-shaped, so that water flow impact is effectively reduced.

Further, through design analysis, the tail fin length a of the tail fin 1 is equal to the outer diameter K of the motor shell; the length B of the tail end of the tail fin 1 is 0.2-0.4 times of the outer diameter K of the motor shell; the thickness D of the tail fin between the tail fin 1 and the connecting point of the end part of the motor shell is 0.1-0.2 times of the outer diameter K of the motor shell; the tail fin included angle C of the tail fin 1, namely the included angle between the oblique edge of the tail fin and the transverse central axis of the motor shell, is 40-60 degrees, preferably 50 degrees

In the present embodiment, the main factors affecting the implementation effect of the tail fin 1 are the tail fin length a, the tail end length B, the tail fin included angle C, and the tail fin position D; through design analysis, the longer the tail fin length A, the longer the front edge of the tail fin can extend forward, the earlier intervention nacelle tail vortex, when the tail end length B sets up to 0.2-0.4 times of the motor casing outer diameter K, the tail fin included angle C sets up to 50 degrees, the tail fin position D sets up to 0.1-0.2 times of the motor casing outer diameter K, the effect of the tail fin 1 is more favorably exerted at this moment, the capability of intervening the nacelle tail vortex is further enhanced, and the implementation effect of the tail fin 1 is enhanced.

Further, the distance from the front edge of the thrust fin 2 to the center of the propeller is F, and the center distance F is not more than 1/2; preferably, the center distance F is 0.4-0.5 times of the outer diameter K of the motor shell; setting the chord length E of the thrust fin 2 to be 1/4-1/2 times of the diameter M of the propeller; preferably 1/3 times; setting the circumferential angle H of the thrust fin 2, namely the included angle between the axis of the thrust fin 2 and the longitudinal central axis of the motor shell to be 50-70 degrees, preferably 60 degrees; the thrust fin span length G of the thrust fin 2 is set to satisfy: g is 0.35M-0.5K; wherein: m denotes the propeller diameter and K denotes the motor housing outer diameter, i.e. the radial maximum position of the thrust fin is set to 0.7 times the blade radius.

In the present embodiment, the closer the axial position of the thrust fin 2 is to the propeller, the greater the advantageous effect is produced, so that the advantage of double fins is greater than single fins, which is greater than finless. Therefore, the two thrust fins 2 are symmetrically arranged, and the thrust fins arranged according to the parameters can effectively eliminate tip vortexes appearing behind the blade tips of the propeller,

through the combination form of the thrust fin 2 and the tail fin 1 and the optimization of the geometrical shape of the fin plate, the energy-saving pod propeller has a prominent effect, and through calculation, the efficiency of the pod propeller with the combined fin structure is 2.77% higher than that of a non-fin pod propeller, and the lateral force of the attached fin pod under the design working condition is almost zero, so that the straight sailing performance of the ship is improved, and the energy consumption of the ship is reduced.

The utility model discloses a theory of operation and use flow: the utility model discloses install the back well, tail fin 1 designs for simple and easy dull and stereotyped cross structure, tail fin length A is equal to motor casing external diameter K, tail fin length A is longer more, the leading edge of tail fin can extend to the place ahead, can intervene nacelle afterbody vortex earlier, two thrust fins 2 set up for the symmetry, thrust fin 2's axial position is close to the screw, through the combination form of above-mentioned thrust fin 2 and tail fin 1, including the geometry optimization of fin board, there is the outstanding effect in the aspect of energy-conservation to improve the straight navigation ability of boats and ships, the energy resource consumption of boats and ships has been reduced.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A pod propeller fin structure to increase hydrodynamic performance, characterized by: the fin plate structure comprises a tail fin (1) and two thrust fins (2), the pod propeller comprises a lower box body (3), the bottom of the lower box body (3) is connected with a motor shell, one end of the motor shell is provided with a propeller, the other end of the motor shell is provided with the tail fin (1), and the tail fin (1) is of a flat cross structure; the two thrust fins (2) are symmetrically arranged on two side walls of the motor shell and close to one end of the propeller; the tail fin length A of the tail fin (1) is equal to the outer diameter K of the motor shell.

2. The pod propeller fin structure for increasing hydrodynamic performance of claim 1, wherein: the section of the middle position of the lower box body (3) is NACA-shaped, and the section of the thrust fin (2) is NACA-shaped.

3. The pod propeller fin structure for increasing hydrodynamic performance of claim 1, wherein: the tail end length B of the tail fin (1) is 0.2-0.4 times of the outer diameter K of the motor shell.

4. The pod propeller fin structure for increasing hydrodynamic performance of claim 1, wherein: the thickness D of the tail fin between the tail fin (1) and the end connecting point of the motor shell is 0.1-0.2 times of the outer diameter K of the motor shell.

5. The pod propeller fin structure for increasing hydrodynamic performance of claim 1, wherein: and a tail fin included angle C of the tail fin (1), namely an included angle between a tail fin bevel edge and the transverse central axis of the motor shell is 40-60 degrees.

6. The pod propeller fin structure for increasing hydrodynamic performance of claim 5, wherein: and a tail fin included angle C of the tail fin (1), namely an included angle between a tail fin bevel edge and the transverse central axis of the motor shell is 50 degrees.

7. The pod propeller fin structure for increasing hydrodynamic performance of claim 1, wherein: the distance from the front edge of the thrust fin (2) to the center of the propeller is F, and the center distance F is not more than 1/2 motor casing outer diameter K.

8. The pod propeller fin structure for increasing hydrodynamic performance of claim 7, wherein: the center distance F is 0.4-0.5 times of the outer diameter K of the motor shell.

9. The pod propeller fin structure for increasing hydrodynamic performance of claim 1, wherein: the chord length E of the thrust fin (2) is 1/4-1/2 times of the diameter M of the propeller.

10. The pod propeller fin structure for increasing hydrodynamic performance of claim 9, wherein: the thrust fin chord length E of the thrust fin (2) is 1/3 times of the propeller diameter M.

11. The pod propeller fin structure for increasing hydrodynamic performance of claim 1, wherein: the thrust fin circumferential angle H of the thrust fin (2), namely the included angle between the axis of the thrust fin (2) and the longitudinal central axis of the motor shell is 50-70 degrees.

12. The pod propeller fin structure for increasing hydrodynamic performance of claim 11, wherein: the thrust fin circumferential angle H of the thrust fin (2), namely the included angle between the axis of the thrust fin (2) and the longitudinal central axis of the motor shell is 60 degrees.

13. The pod propeller fin structure for increasing hydrodynamic performance of claim 1, wherein: the thrust fin span length G of the thrust fin (2) meets the following requirements: g = 0.35M-0.5K; wherein: m represents the propeller diameter, and K represents the motor housing outer diameter.