CN109070982A

CN109070982A - The propulsion device of ship

Info

Publication number: CN109070982A
Application number: CN201680084267.0A
Authority: CN
Inventors: 滨地佐知子; 增田圣始
Original assignee: IHI Marine United Inc
Current assignee: IHI Marine United Inc; Japan Marine United Corp
Priority date: 2016-03-29
Filing date: 2016-03-29
Publication date: 2018-12-21
Also published as: JP6827034B2; KR20180128947A; WO2017168549A1; PH12018501768A1; SG11201806287WA; JPWO2017168549A1

Abstract

In the front of propeller 1, has the energy saving additives 5 with curved surface radius R more smaller than the radius r of propeller 1, the screw pitch of the blade 3 of propeller 1 has the screw pitch distribution possessed at the radial direction position in the radius R than energy saving additives 5 closer to inside for the smallest minimal point S.

Description

The propulsion device of ship

Technical field

The present invention relates to a kind of propulsion devices of ship, have energy saving additives in front of propeller.

Background technique

It is known that the advance of ship causes on the quarter nearby to generate vertical vortex (bilge vortex), have since the vertical shaft revolves Whirlpool and do not improve this project of propulsive efficiency not significantly.

Accordingly, there exist following schemes: by the way that in the front of propeller, setting improves being known as the flow field on propeller periphery The energy saving additives of super conductance pipe (SSD=Super Stream Duct) etc., so as to improve energy-saving effect, moreover, passing through setting The screw pitch of propeller, so as to improve propulsive efficiency (patent document 1,2).

In the same manner as the propeller of existing type, the screw pitch of the blade of propeller documented by patent document 1 become with Become the spiral shell that successively decreases that maximum value and the mode at blade tip as minimum value are reduced towards radial direction at root of blade Away from.In addition, the screw pitch of the blade of propeller documented by patent document 2 with rear end of conduit portion at conduit radial location phase Same radial position is minimum.

Existing technical literature

Patent document

Patent document 1: No. 5230852 specifications of Japanese Patent No.；

Patent document 2: Japanese Unexamined Patent Publication 10-264890 bulletin.

Summary of the invention

Subject to be solved by the invention

But in patent document 1 and 2, the screw pitch of the blade of propeller does not become relative to being arranged in the front of propeller Energy saving additives and suitably corresponding screw pitch distribution.Therefore, do not play realized and having energy saving additives it is sufficient Energy-saving effect, thus there is a possibility that propulsive efficiency that cannot improve propeller significantly.

It is an object of the present invention to have in the propulsion device of the ship of energy saving additives in front of propeller, significantly Improve propulsive efficiency in ground.

Solution for solving the problem

The propulsion device of ship of the invention has in the front of propeller with radius more smaller than the radius of the propeller The energy saving additives of curved surface,

The screw pitch of the blade of said spiral paddle has the radial direction position in the radius than aforementioned energy saving additives closer to inside The screw pitch distribution that the place of setting possesses for the smallest minimal point.

In the propulsion device of above-mentioned ship, the radius of aforementioned energy conservation additives can be relative to the radius of said spiral paddle And it is 50% or more and 80% or less.

In the propulsion device of above-mentioned ship, aforementioned minimal point is located on the outside of from the axle center of aforementioned propeller to radial direction It is positioned away from 50% or more and the 100% or less of the radius of aforementioned energy saving additives.

In the propulsion device of above-mentioned ship, the screw pitch of the blade of the said spiral paddle at aforementioned minimal point is to the spiral The screw pitch of the blade end of the blade of paddle and blade root carry out linear interpolation and find out 80% or more of value and less than 100%.

The effect of invention

The propulsion device of ship according to the present invention can play the effect for improving propulsive efficiency significantly.

Detailed description of the invention

Fig. 1 is the side view for schematically showing the propulsion device of the invention that the quarter of ship has；

Fig. 2 is the screw pitch of the blade on the radial direction for propeller, in a manner of it can compare while being shown of the invention The line chart of the case where situation and patent document 1,2；

Fig. 3 be for illustrating the screw pitch of blade of the invention shown in Fig. 2 in the case where effect line chart；

Fig. 4 is the perspective view for having the model ship of VLCC oil tanker of composition of the invention from quarter rear；

Fig. 5 is the chart for showing the relationship of the ship's speed and torque of propeller that measure by model test.

Specific embodiment

Hereinafter, being explained with reference to the embodiment of the present invention.

Fig. 1 is the side view for schematically showing the propulsion device of the invention that the quarter of ship has.In Fig. 1 In, 1 is the rear for reaching the quarter 2 of ship and the propeller being arranged, and 3 be the blade installed of hub 4 in propeller 1.5 are In the energy saving additives of aforementioned quarter 2 setting in a manner of being located at the front of said spiral paddle 1, the energy saving additives 5 of Fig. 1 shows The case where being used as stern conduit 6 out.

Energy saving additives 5 be thrust is generated by energy saving additives 5 itself, or improve the periphery of propeller 1 flow field and Energy-saving effect is obtained, does not improve the performance of propeller 1 directly.Then, the present invention, which provides, directly improves based in energy conservation The technology of the efficiency of propeller 1 at 5 rear of additives.

The energy saving additives 5 of Fig. 1, which is shown, has the curved surface (round surface) radius R more smaller than the radius r of said spiral paddle 1 Stern conduit 6 the case where.The radius R of the rear end of aforementioned stern conduit 6 relative to said spiral paddle 1 radius r and become 50% Above and 80% size below.In fig. 2 it is shown that the radius R of aforementioned stern conduit 6 is 60% feelings of the radius r of propeller 1 Condition.

In addition, being illustrated among the above to using energy saving additives 5 as the case where stern conduit 6, but energy conservation is additional Object 5 is also possible to make the arcuation body of a part of notch of the round surface of stern conduit 6.

As being shown in Fig. 2 in solid line 7, the screw pitch of the blade 3 of said spiral paddle 1 has than aforementioned stern conduit 6 radius R is closer to the screw pitch distribution possessed at the radial direction position of inside for the smallest minimal point S.

The minimal point S of aforementioned screw pitch is located at from the axle center O of aforementioned propeller 1 on the outside of radial direction, using as aforementioned section 50% or more and the 100% or less of the radius R of the stern conduit 6 of energy additives 5 positions away from.That is, in the figure 2 example, spiral shell Away from minimal point S be to be positioned away from from axle center O with 30% or more and the 60% or less of the radius r of propeller 1.

The aforementioned minimal point S for the screw pitch that the blade 3 of said spiral paddle 1 has is the leaf to the blade 3 of said spiral paddle 1 The screw pitch of piece end 3a and root of blade 3b carry out linear interpolation and 80% or more and the range less than 100% of value that find out.

In addition, in Fig. 2, other than the situation of the invention shown in solid line 7, additionally it is possible to existing by showing simultaneously The case where and be compared.That is, being shown as the propeller of the propeller of existing type and patent document 1 in dotted line A, have With as maximum value, and at blade tip 3a, screw pitch becomes the mode of minimum value to screw pitch at root of blade 3b, to radius side To the existing example of the decreasing pitch of reduction.In addition, showing as the propeller of patent document 2 in two dot dot dash B, make spiral shell The screw pitch for revolving the blade of paddle is the smallest existing at the position of radius identical with the position of radius R of conduit at rear end of conduit portion Some improvement examples.

In fig. 1 it is illustrated that having the wake flow of the quarter 2 of the ship of stern conduit 6, the vector of wake flow shows solid in hull The flow velocity near propeller 1 observed on position fixing.It is the forward speed va of propeller 1 with the flow velocity shown in the vector.Setting The feature for having the ship of stern conduit 6 is that the radius R than stern conduit 6 is shown closer to the progresses inside speed va1 inside Relative to the radius R than stern conduit 6 closer to outside outside forward speed va2 and significantly small value.

Generally, due to the performance of propeller 1 is different in uniform flow and in non-uniform flow, thus it is considered that existing The propeller of type does not become optimal screw pitch in the wake flow in the radius R than stern conduit 6 closer to inside, therefore under efficiency Drop.

Fig. 3 shows the inflow velocity for flowing into the blade profile of the blade 3 of radius r of propeller 1.Geometry flows into angle beta by preceding It is determined into the ratio of speed va and 2 π nr of rotation speed (n is rotation number).The geometry angle of attack is adjusted to most according to the screw pitch of blade 3 It is good, but if the forward speed va assumed in design is bigger than reality, then angle beta is flowed into based on excessive geometry and optimized, As a result, the geometric pitch angle of blade 3 too greatly designs compared with actual optimum value.(here, carrying out for simplicity Illustrate, the influence not comprising the induced velocity caused by propeller itself.) it is considered that in the propeller of existing type, in phase When in due to stern conduit 6 and at the radial direction position of the blade of forward speed va especially small part, screw pitch is excessive.

Then, in propeller 1 according to the present invention, speed of advancing is caused and being equivalent to due to stern conduit 6 The radial direction position for spending the position of the especially small progresses inside speed va1 of va, is arranged spiral shell of the screw pitch than existing type of blade The smaller position of paddle is revolved, to improve the ship for having stern conduit 6 as a result, close to the actual optimal geometry angle of attack Propeller efficiency in wake flow.

Fig. 4 shows the model ship 8 for having the VLCC oil tanker (mammoth tanker) of composition of the invention, which is arranged In ship type experimental tank (not shown), implementation result validation test.In addition, in Fig. 4, by with composition shown in figure 1 Identical composition marks identical symbol, thus the repetition omitted the description.In Fig. 4,9 be rudder.

Fig. 5 is the relationship for showing the ship's speed and torque of propeller that measure by the effect validation test of the model ship 8 of Fig. 4 Chart.U is set as speed, by g in the representational length for the object being set as L in stream by ship's speed shown in the horizontal axis of Fig. 5 When being set as acceleration of gravity, shown with nondimensional Froude number F related with the flowing for the fluid for possessing Free Surface:

[number 1]

……(1)。

The torque of propeller of the longitudinal axis of Fig. 5 is shown with Δ Q={ (torque of propeller of the invention)-(spiral shell of existing type Revolve the torque of paddle) }/(torque of the propeller of existing type) show.

It according to Fig. 5, can investigate out, since the blade profile performance of propeller of the invention improves, thus with mutually shipmate Torque when speed generates identical thrust is reduced.

That is, in Fig. 5, the ship's speed for being 0.15 relative to Froude number F and the slow Froude number F of ship's speed be 0.13 ~ In the range of 0.14, torque of propeller greatly declines, thus considers to play the ship's speed of the effect of Fig. 5, designs actual ship, Thus, it is possible to which the propulsive efficiency of ship is set to height, burnup can be cut down.

As described above, in the composition that the front of propeller 1 has energy saving additives 5, the screw pitch of the blade 3 of propeller 1 By having, to possess at the radial direction position in the radius R than aforementioned energy saving additives 5 closer to inside be the smallest minimum The screw pitch of point S is distributed, so as to improve the propulsive efficiency of ship significantly.

Industrial availability

For requiring the ship of raising propulsive efficiency, the propulsion device of ship of the invention be can be effectively applied.

Symbol description

1 propeller

3 blades

3a blade tip

3b root of blade

5 energy saving additives

6 stern conduits (energy saving additives)

7 solid lines (screw pitch distribution)

The axle center O

The radius of r propeller

The radius of R stern conduit

S minimal point.

Claims

1. a kind of propulsion device of ship,

In the front of propeller, have the energy saving additives of the curved surface with radius more smaller than the radius of the propeller,

The screw pitch of the blade of the propeller has the radial direction position in the radius than the energy saving additives closer to inside The screw pitch distribution that the place of setting possesses for the smallest minimal point.

2. the propulsion device of ship according to claim 1, which is characterized in that it is described energy conservation additives radius relative to The radius of the propeller and be 50% or more and 80% or less.

3. the propulsion device of ship according to claim 1, which is characterized in that the minimal point is located at from the propeller Axle center positioned away on the outside of radial direction with 50% or more and the 100% or less of the radius of the energy saving additives.

4. the propulsion device of ship according to claim 2, which is characterized in that the minimal point is located at from the propeller Axle center positioned away on the outside of radial direction with 50% or more and the 100% or less of the radius of the energy saving additives.

5. the propulsion device of ship according to any one of claims 1 to 4, which is characterized in that at the minimal point The screw pitch of blade of the propeller be that linear interpolation is carried out to the screw pitch of the blade end of the blade of the propeller and blade root And 80% or more of the value found out and less than 100%.