CN1067413A - Ellipsoidal nose-stem and manufacture method thereof - Google Patents
Ellipsoidal nose-stem and manufacture method thereof Download PDFInfo
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- CN1067413A CN1067413A CN 92102371 CN92102371A CN1067413A CN 1067413 A CN1067413 A CN 1067413A CN 92102371 CN92102371 CN 92102371 CN 92102371 A CN92102371 A CN 92102371A CN 1067413 A CN1067413 A CN 1067413A
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- waterline
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Abstract
The present invention relates to a kind of energy saver that is located at the minimizing residuary resistance of foremost part of ship, the feature of its ellipsoidal nose-stem of the present invention is that the above waterline of the first maximum width of ball is ellipse, and body lines is a semicircle.The present invention can reduce boat residuary resistance 30% or total drag 10%, and the reduction of tractive power can surpass 10% to 15%, and speed of a ship or plane boats and ships in Froude number 0.20 to 0.35 scope all can extensively be suitable for simultaneously.
Description
The present invention relates to a kind of energy saver that is located at the minimizing residuary resistance of foremost part of ship.
Acting on before 100 years of the first wave absorption drag reduction of ball found, China just gradually adopted in 1970's, the home and abroad scholar has carried out big quantity research to the first wave absorption mechanism of ball, but up to the present also there is not which individual design ball first and do not confirm as model experiment, because the first energy-saving effect of ball nose is remarkable, the design engineer of home and abroad to how designing and make a good ball capital is kept secret, and relevant document is also considerably less.Unfamiliar design engineer can only the design of carrying out ship ball head with reference to line style artwork rope, making ship model is then tested and is verified, change an examination more again if effect is bad, go down also to be difficult to find a kind of comparatively ideal ball head so repeatedly, simultaneously, even certain bar ship there is the ball head of certain effect, change on the ship of another kind of specification inapplicable again, so shipbuilding circles has spent a large amount of human and material resources for this reason, and the ball head of the ship in the certain limit specification can not use mutually, causes the difficulty of system ship.
The purpose of this invention is to provide and a kind ofly can effectively reduce residuary resistance, improve the ball head and the manufacture method thereof of propulsion coefficient, this ball is first and can be applicable to the use of the speed of a ship or plane at Froude number 0.20 to 0.35 scope internal drainage amount boats and ships.
Technical solution of the present invention is achieved in that the first first half of ball is 1/4th ellipsoids, and the first lower part of ball cooperates with hull form on the approximate vee-type basis, and the above waterline of the first maximum width of ball of the present invention is oval, and body lines is a hemicycle.
The above ball head middle part waterline is bordering on line parallel in the hull.
Ellipsoidal nose-stem of the present invention, the angle of advancing of bow load water line is preferably in below 13 °.
The length that the waterline of bow entrance of vessel of the present invention stretches out fore perpendicular than waterline half-breadth more than or equal to 2.
What be worth proposition is Froude number F of the present invention
nBe less than or equal at 0.22 o'clock, its ball head relevant with the intensity of the first wave making of ball is at the C of the ratio of the midship section area of the area of section at fore perpendicular place and ship
ABTEqual 10% for good, work as F
nGreater than 0.22 o'clock, C
ABTEqual 15% for good.
The ratio of the oval cylinder length semiaxis of ball head of the present invention is 2 to 3 for good.
Place, the desired hull of ellipsoidal nose-stem of the present invention 20 stations waterline slope is similar to zero.
Manufacture method of the present invention is such, according to shown in Figure 3, by the C of selected ship ball head
ABT, C
LPR, C
ZB, C
BBParameter, on body plan, draw earlier the body lines at 20# station, from B
B=C
BB* B
MSDraw ball head at the 20# maximum half-breadth B that stands
B/ 2, on line of centers, with Z
B=C
ZB* T
PTPoint be the center of circle, with B
B/ 2 justify for radius, and justifying with this then is that body lines is drawn on the basis, makes cross sectional area equal C
ABT* A
MS, notice that following each the waterline half-breadth of maximum width can not be too big, as the explanation B that is too obese
BObtain too for a short time, suitably increase B
B, or the leftover bits and pieces at 20# place obtains too highly, suitably lower, and the above waterline half-breadth of maximum width can not strengthen, and remains hemicycle as far as possible, be connected with the design load water line place with a bit of curve,
Secondly, shown in Fig. 1,4, drawing the first side profile of ball on elevations, is oval more than the B point, and its major semiaxis is L
PR, semi-minor axis is B
B/ 2, link to each other with the intersection point of a bit of curve with fore perpendicular and design load water line, the following and bilge keel wire joint of B point,
Then, according to shown in Figure 3, can begin on plan of waterlines, to draw waterline, the wideest supernatant waterline is oval, can be ellipse or parabola or sub-elliptical with splash line, but be sure not to be great circle arc, after waterline before the fore perpendicular is painted, connect the entering the angle and will change little of load water line again along the waterline between 20～19 stations, can change little to below 13 °, it is fixed that concrete how many size to fits will be come according to line style, waterline advance the angle change little after, the maximum angle of contingence of waterline will inevitably increase, as long as enter the angle and maximum angle of contingence sum remains unchanged, just can improve wave breaking resistance.
Subsequently, according to shown in Figure 3, refute and get the waterline half-breadth of respectively standing from having painted waterline, thereby draw A, B before the fore perpendicular, C ... each body lines and 19 1/2,19 3/4 of standing, 19 1/4 station body lines suitably make an amendment waterline till fairing again if any not fairing part.
At last, according to shown in Figure 2, make buttock line, carry out 3D fairing, suitably revise body lines, waterline it is pointed out that in drawing the first process of ball till the each point three-dimensional is coincide, hold and make ball head can produce low pressure, the angle of contingence that promptly forms waterline before and after the 20# station is very little, and the waterline curvature change can not be too big between 20～19 stations, relax, otherwise current are uprushed at the big local resistance of curvature change, influence the first wave dissipation effect of ball, grasp above-mentioned main points, ball is first next preferably just to design and produce effect.
By modern wave making theory, wave making resistance can be divided into wave pattern resistance and wave breaking resistance, wave pattern resistance is the resistance that can propagate into the linear wave generation at rear far away, wave breaking resistance is the resistance that the nonlinear wave that can not propagate causes, a ball head who designs well just can reduce above-mentioned two kinds of wave energy loss, thereby reduces wave resistance.The reduction of wave pattern resistance is that the phase of wave that phase place and main body produce is anti-by suitable wave height of the first generation of ball, thereby the synthetic wave height minimizing of two wave systems is reached.And influence the greatest factor of the wave height of ball head, the ratio C that to be the ball head relevant with the first wave making intensity of ball amass at the midship section of the area of section at fore perpendicular place and ship
ABT, also impromptu intensity of wave is directly proportional at the area of section at vertical line place with ball head, is inversely proportional to the midship section area of ship, so part of the present invention just is the above waterline of the first maximum width of ball for oval, body lines is a hemicycle, and this ratio is at Froude number F
n≤ 0.22 o'clock is good with 10%, works as F
n＞0.22 o'clock is good with 15%, and that influence that the phase place of the first wave making of ball has important relationship is the C of the ratio of the ball head length between perpendiculars of stretching out the length of fore perpendicular and ship
LPRAlso be that phase place is directly proportional with the length that ball head stretches out fore perpendicular, be inversely proportional to the center-to-center length of ship, this ratio is preferable with 1 to 1.5, the ratio 2 to 3 that also promptly is equivalent to oval cylinder length semiaxis, the viscous pressure resistance of such ratio ball head is less, is also noted that simultaneously length and ball head that ball head stretches out fore perpendicular put foremost apart from adapting between the ratio of the baseline aspect ratio draft fore degree of depth, so that ball head vertically is easy to and hull fairing transition.And the free surface shock wave that influences wave breaking resistance mainly be with Free Surface near waterline to enter the angle relevant, suitable minimizing waterline enters the angle and just can reduce free surface shock wave, place, 20 stations therefore of the present invention waterline slope is similar to zero, the angle of advancing of the first load water line of ball preferably is not higher than 13 °, thereby reduces wave breaking resistance effectively.
Fig. 1 is a Parameter Map of the present invention;
Fig. 2 is prismatic curve figure of the present invention;
Fig. 3 is elevation profile line style figure of the present invention;
Fig. 4 is sectional line style figure of the present invention.
Advantage of the present invention is by ellipsoidal nose-stem shape of the present invention and design and production method, can reduce boat residue resistance 30% or total resistance 10%, because the reduction of resistance, advance efficient correspondingly to improve, advance the reduction of power can surpass 10%-15%, the boats and ships of the speed of a ship or plane in Froude number 0.20 to 0.35 scope all can extensively be suitable for simultaneously.
Claims (8)
1, a kind of ellipsoidal nose-stem that is used for boats and ships, ball head is half ellipsoid, and the first first half of ball is 1/4th ellipsoids, and the first lower part of ball cooperates approximate V-type with hull form, it is characterized in that the above waterline of the first maximum width of ball for oval, and body lines is a semicircle.
2, ellipsoidal nose-stem according to claim 1, it is characterized in that ball head middle part waterline be bordering on hull in line parallel.
3, ellipsoidal nose-stem according to claim 1 is characterized in that the angle of advancing of bow load water line is preferably in below 13 °.
4, ellipsoidal nose-stem according to claim 1, it is characterized in that length that bow stretches out fore perpendicular than waterline half-breadth more than or equal to 2.
5, ellipsoidal nose-stem according to claim 1 is characterized in that as Froude number F
nBe less than or equal at 0.22 o'clock, itself and the relevant C of intensity of the first wave making of ball
ABTEqual 10% for good, work as F
nGreater than 0.22 o'clock, C
ABTEqual 15% for good.
6, ellipsoidal nose-stem according to claim 1, the ratio that it is characterized in that the oval cylinder length semiaxis of ball head are 2 to 3 for good.
7, ellipsoidal nose-stem according to claim 1 is characterized in that place, the desired hull of ellipsoidal nose-stem 20 stations waterline slope is similar to zero.
8, a kind of manufacture method that is used for the ellipsoidal nose-stem of boats and ships is characterized in that:
A is by the C of selected ship ball head
ABT, C
LPR, C
2B, C
BBParameter, on body plan, draw earlier the body lines at 20# station, from B
B=C
BB* B
MSDraw ball head at the 20# maximum half-breadth B that stands
B/ 2, on line of centers, with Z
B=C
ZB* T
PTPoint be the center of circle, with B
B/ 2 justify for radius, and justifying with this then is that body lines is drawn on the basis, makes cross sectional area equal C
ABT* A
MS, be connected with the design load water line place with a bit of curve again,
B draws the first side profile of ball again on elevations, be oval more than the B point, and its major semiaxis is L
PR, semi-minor axis is B
B/ 2, link to each other with the intersection point of a bit of curve with fore perpendicular and design load water line, the following and bilge keel wire joint of B point,
C begins to draw waterline then on plan of waterlines, the wideest supernatant waterline is oval, can be ellipse or parabola or sub-elliptical with splash line, after the waterline before the fore perpendicular is painted, connect again along the waterline between 20 to 19 stations, load water line advance the angle to change little,
D refutes and gets the waterline half-breadth of respectively standing from having painted waterline, thereby draws fore perpendicular A, B, C ... each body lines and 19 1/2,19 3/4 of standing, 19 1/4 station body lines,
E makes buttock line at last, carries out 3D fairing, suitably revises body lines, and waterline is till the each point three-dimensional is coincide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102371 CN1067413A (en) | 1992-03-28 | 1992-03-28 | Ellipsoidal nose-stem and manufacture method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102371 CN1067413A (en) | 1992-03-28 | 1992-03-28 | Ellipsoidal nose-stem and manufacture method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1067413A true CN1067413A (en) | 1992-12-30 |
Family
ID=4939603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92102371 Pending CN1067413A (en) | 1992-03-28 | 1992-03-28 | Ellipsoidal nose-stem and manufacture method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1067413A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1319811C (en) * | 2003-11-28 | 2007-06-06 | 住友重机械工业株式会社 | Ship |
| CN103407546A (en) * | 2013-07-29 | 2013-11-27 | 福建新胜海船业有限公司 | Process for manufacturing bulbous bow in left-right split manner then in combined manner |
| CN103625601A (en) * | 2012-08-20 | 2014-03-12 | 中集船舶海洋工程设计研究院有限公司 | Head structure of container ship |
| CN104554615A (en) * | 2014-12-11 | 2015-04-29 | 上海船舶研究设计院 | Ship energy-saving bulbous bow |
| CN104890806A (en) * | 2014-03-03 | 2015-09-09 | 中集船舶海洋工程设计研究院有限公司 | Ship |
| CN104890807A (en) * | 2014-03-03 | 2015-09-09 | 中集船舶海洋工程设计研究院有限公司 | Ship |
| CN105916763A (en) * | 2013-12-20 | 2016-08-31 | 阿克北极科技公司 | Icebreaking vessel |
| CN106828771A (en) * | 2017-02-09 | 2017-06-13 | 大连中远船务工程有限公司 | Container ship bulb bow block renews installation method |
| CN113815768A (en) * | 2021-10-29 | 2021-12-21 | 广州文冲船厂有限责任公司 | Ship bow structure and ship |
-
1992
- 1992-03-28 CN CN 92102371 patent/CN1067413A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1319811C (en) * | 2003-11-28 | 2007-06-06 | 住友重机械工业株式会社 | Ship |
| CN103625601A (en) * | 2012-08-20 | 2014-03-12 | 中集船舶海洋工程设计研究院有限公司 | Head structure of container ship |
| CN103407546A (en) * | 2013-07-29 | 2013-11-27 | 福建新胜海船业有限公司 | Process for manufacturing bulbous bow in left-right split manner then in combined manner |
| CN103407546B (en) * | 2013-07-29 | 2016-12-28 | 福建新胜海船业有限公司 | A kind of left and right divides system to close the bulb bow manufacturing process of system again |
| CN105916763A (en) * | 2013-12-20 | 2016-08-31 | 阿克北极科技公司 | Icebreaking vessel |
| CN104890806A (en) * | 2014-03-03 | 2015-09-09 | 中集船舶海洋工程设计研究院有限公司 | Ship |
| CN104890807A (en) * | 2014-03-03 | 2015-09-09 | 中集船舶海洋工程设计研究院有限公司 | Ship |
| CN104890807B (en) * | 2014-03-03 | 2018-03-30 | 中集船舶海洋工程设计研究院有限公司 | Ship |
| CN104554615A (en) * | 2014-12-11 | 2015-04-29 | 上海船舶研究设计院 | Ship energy-saving bulbous bow |
| CN106828771A (en) * | 2017-02-09 | 2017-06-13 | 大连中远船务工程有限公司 | Container ship bulb bow block renews installation method |
| CN113815768A (en) * | 2021-10-29 | 2021-12-21 | 广州文冲船厂有限责任公司 | Ship bow structure and ship |
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