CN1036734A - Ship with large radius-depth is than advancing flow field stern type - Google Patents

Ship with large radius-depth is than advancing flow field stern type Download PDF

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Publication number
CN1036734A
CN1036734A CN89102251A CN89102251A CN1036734A CN 1036734 A CN1036734 A CN 1036734A CN 89102251 A CN89102251 A CN 89102251A CN 89102251 A CN89102251 A CN 89102251A CN 1036734 A CN1036734 A CN 1036734A
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stern
type
ship
ships
boats
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CN1019961C (en
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安茂榕
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WATER TRANSPORT SCIENCE INST MINISTRY OF COMMUNICATIONS
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WATER TRANSPORT SCIENCE INST MINISTRY OF COMMUNICATIONS
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T70/10—Measures concerning design or construction of watercraft hulls

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Abstract

The present invention proposes a kind of flow field ship stern, this ship stern is different from common ship stern but a kind of stern type and screw propeller, rudder for ship being taken into consideration so that its shape can produce the flow field that is fit to screw propeller work, after increasing the oar card, still can effectively work, and can increase incoming flow to improve the screw propeller work efficiency.This flow field stern type is specially adapted to line drinking water ship, can be used with shrouded propeller or non-shrouded propeller, need not to increase marine main engine power and can improve the navigation ability.

Description

Ship with large radius-depth is than advancing flow field stern type
The present invention relates to boats and ships flow field stern type, be applicable to coastal marine site, the power vessels of the Changjiang river, lake and each inland waters and various Fishery Vessel, be particularly suitable for the drinking water of the shallow draft in shallow water territory and hyperline in, heavy load, the boats and ships that single, double screw propeller advances.
Existing shallow water territory is to go to design shaping from the angle that reduces resistance with the stern type of various shallow draft boats and ships isolatedly, screw propeller then isolatedly is analyzed the selection parameter from improving its spacious water efficient, the two considers the influence of the two respectively after the individual processing again, predict its key property, think that promptly screw propeller works independently in ship stern flow field, ship stern flow field is the simple superposition in single ship and single-blade flow field.Therefore, existing ship stern shape isolatedly consider and ignored influence to advancing fully from the angle that reduces ship resistance, and presses the spacious aqueous condition of screw propeller, and the parameter of decision is ignored the existence of hull shape again.This just causes propulsion coefficient not high, manoeuvre of ship ability variation, and particularly the light-draft boats and ships in shallow water territory are particularly serious.And the basin of China's natural river depth of water is limited, and the coastal water major part also is a shallow waters, therefore improves the propulsion capability and the operating function of shallow draft power vessels, breaks through conventional method of designing and has special significant meaning.Once adopt flat type or stream line pattern abroad, domestic adopted stream line patterns more, but all can not propose the breakthrough of essence.Therefore, the variety of problems such as low efficiency that exist in the present invention is directed to the propelling of shallow water territory shallow draft and ultra-shallow draft power vessels and handling, proposition designs the requirement of ship stern type and propelling, manipulation as a whole with raising speed and propulsive force, rather than reaches this purpose with the capacity that increases main frame.And the shape that makes the ship stern can cause and help screw propeller and give full play to efficient, help improving the manoeuvre of ship performance, the propelling and the road-holding property of these boats and ships of favourable flow field that the ship stern causes make when propeller blade partly surfaces under worst situation, owing to also can be greatly improved.This is because the flow field that the ship stern that adopts the present invention to propose forms can form stronger contraction a fluid stream in oar dish the place ahead, the screw propeller that card has been increased also can suck current under than the situation of light load, get rid of retention (more than the water surface) air in the stern tunnel, the current that need when fully guaranteeing screw propeller work, make ship stern type adapt to the needs that screw propeller advances and handles thereby reach, the ship stern type that the present invention proposes may increase resistance, but the flow field that is complementary with screw propeller that it causes will be improved operating function and be increased substantially propulsion coefficient, and its gross earnings is much larger than the increase of resistance.
The boats and ships stern type that the present invention proposes with ship stern type with propelling, handle and take design into consideration and be shaped, and the speed that makes the formed flow field of design-calculated ship stern type and distribution of pressure make it to satisfy to increase propeller disc area, increase wake flow sectional area, to cause the requirement of approach such as even wake with the marine propeller momentum theory of raising propulsion coefficient.So that screw propeller still can turn round when surfacing efficiently.Ship stern shaped design becomes to cause a kind of a fluid stream in screw propeller the place ahead, works the work that shrinks current in order to increasing speed of incoming flow before the oar, and a fluid stream that caused of stern type makes its rotation help utilization to the circumferential induction velocity of screw propeller as far as possible.Continue to form the continuous a fluid stream that goes at rear propeller, angle of run should be as far as possible little, to closed stern end angle of run below 14 °, can be used for open type stern end for reducing angle of run the present invention, be that the stern end does not seal, and establish the movable cover plate of a pivotally attached stream line pattern, adopt rubber sheet gasket in conjunction with the stern end at it at the stern end, reduce angle of run to prolong after run, will prevent especially that simultaneously air from sucking.
The shape of the boats and ships stern type that the present invention proposes is to make formed a fluid stream produce the bigger and even wake of trying one's best.
The boats and ships stern type that the present invention proposes be not single be that purpose is determined its shape from reducing resistance, but a kind of stern type and screw propeller, rudder for ship are taken into consideration so that in the speed in the ship stern flow field that forms and the propelling unit momentum theory that distribution of pressure satisfies ship in the propulsion coefficient expression formula with increase rotor disk area A oIncrease incoming flow V AAnd raising propulsion coefficient η AiThe stern type that requires of theory.
Described propulsion coefficient expression formula is:
η Ai = 2 1+ 1+σ＇T
σ ＇ T=wherein T i 1 2 ·ρ·Ao·V 2 A
η Ai-desirable propulsion coefficient;
T i-thrust;
ρ-water tightness;
A o-propeller disc area;
V A-oar the place ahead incoming flow.
In ship design in the past, can not be implemented in and increase rotor disk area A oThe time, make incoming flow V again AIncrease.And after the present invention introduced the design of boats and ships stern type to the screw propeller momentum principle, the large radius-depth that obtains was than advancing flow field stern type then to produce such result.
The boats and ships stern type base model that the present invention proposes is such: the stern type vertically contour shape of the bench section at each position is approximate arch, has the garden cambered top end in the screw propeller region, along with front and back are gradually mild away from garden, the top arc of the stern type cross section shape at screw propeller place, dome height also descends thereupon, the both sides of each cross-sectional profile shape are connected with straight shipboard face transition glossily, the arch span of each cross-sectional profile shape is different, square broad in face of the oar, asymptotic oar card and reducing gradually, rearward increase gradually again from the oar card, stern type elevation profile contour shape is can play half mozzle effect and can form the tunnel-like of shrinking a fluid stream of rotation to the ship stern.
Fig. 1 is stern type elevation profile, the twin screw flow field contour shape scheme drawing that the present invention proposes;
Fig. 2 is the flow field stern type cross-sectional profile shape scheme drawing that each lengthwise position of relative Fig. 1 is done;
Fig. 3 is stern type elevation profile, the single screw flow field contour shape scheme drawing that the present invention proposes;
Fig. 4 is the flow field stern type cross-sectional profile shape scheme drawing that each lengthwise position of relative Fig. 3 is done;
Fig. 5 is the elevation profile contour shape scheme drawing of existing triangle line style stern type;
Fig. 6 is the cross-sectional profile shape scheme drawing of the existing triangle line style stern type that each lengthwise position is done among relative Fig. 5;
Fig. 7 is the elevation profile contour shape scheme drawing of existing knuckle line stern type;
Fig. 8 is the cross-sectional profile shape scheme drawing of the existing knuckle line stern type that each lengthwise position is done among relative Fig. 7.
A is an open type stern end among the figure, and B is an enclosed stern end, and C is a screw propeller, and E is the stern end points, h TBe the tunnel top line height, β is for dividing water heel angle.In conjunction with the accompanying drawings 1,2 and 3,4 and Fig. 5,6 and 7,8, the flow field stern type that proposes of the present invention and the difference of existing stern type as can be seen.
Vertically play lift angle θ behind the midship of the boats and ships stern type that the present invention proposes 1Be about 20 °, this angle is the smaller the better.Vertically play the inclination transition gently of lift angle place and shipboard behind the midship, avoid interlayer to separate and produce eddy current to stern.These needs of being not only the flow field also are to guarantee fully to supply with the needs that screw propeller is inhaled stream.
Its stern end of boats and ships stern type that the present invention proposes for can sink to below the drauht line apart from △ d '=0.1 meter or maybe can exceed below 0.1 meter more than the drauht line apart from △ d=0.05 rice or two kinds of forms more than 0.05 meter, shipboard sinks dark edge △ d SThe coastal water boats and ships then should could guarantee not aspirated air like this more than 0.4 meter more than=0.2 meter.
The boats and ships stern type that the present invention proposes is for twin-propeller, and its minute water heel β is tilted should be about 15 ° by the bottom upward.
The large radius-depth that the present invention proposes is expressed as follows than the basic specification scope and the symbol connotation of flow field stern type: (as Fig. 1,2 and Fig. 3,4)
Large radius-depth is than length of tunnel L 1;
Boats and ships waterline length L WL;
The propeller center line to the stern end distance from L 2, L ' 2;
The tunnel plays lift angle θ 1;
To stern angle of run θ 2;
The stern end sinks dark △ d ';
The stern end exceeds △ d;
The stern shipboard sinks dark △ d s;
Tunnel top line height h T;
Drauht d;
Diameter of propeller D.
The scope of above-mentioned each parameter is as follows:
L 1/L WL＝0.3-0.6;
D/d＝1.0-1.4;
L ' 2=1D-2D(is for enclosed stern end);
L 2=1D-1.5D(is for open type stern end);
θ 1＝13°-25°;
θ 2≤ 14 °; △ d s〉=0.2 meter;
△ d ' should be 0.1 meter to enclosed stern end for sinking to the drauht amount, or below 0.1 meter;
△ d opposite opened stern end should be more than 0.05 meter or 0.05 meter for exceeding the drauht amount;
The flow field stern type that the present invention proposes can be stern end points surface the open type tunnel-like of height △ d or the enclosed tunnel-like that the stern end points immerses underwater degree of depth △ d ', and boats and ships stern when navigating of open type tunnel-like stern type is equipped with the stern cover plate.
The flow field concrete parameter of stern type that the present invention that No. 319 push boats of the E Hang of hubei province shipping company adopt proposes is as follows:
L WL=23 meters, beam B=8.0 rice, D=1.9 rice
D=2.0 rice, power Ne=2 * 136 kilowatt
Ship stern parameter:
L 1/L WL＝0.596，θ 1＝17.5°
θ 2=11 °, L ' 2=3.2 meters
△ d '=0.1 meter, △ d S=0.20 meter
h T=2.30 meters
The positive bollard pull of real ship is 7.53 tons, and the bollard pull that falls is 6.43 tons, push away 11.26 kilometers of speed of a ship or plane degree/time, push away 2229 tons of cargo capacitys.
Hunan Province shipping office No. 4208 push boats of Hunan boat are shrouded propeller, and the flow field concrete parameter of stern type that adopts the present invention to propose is as follows:
L WL=23 meters, the beam=7.0 meter, D=1.3-1.5 rice
D=1.61 rice, power Ne=2 * 100 kilowatt
Ship stern parameter:
L 1/L WL＝0.457，θ 1＝17.3°
θ 2=6 °, L 2=2.35 meters
△ d=0.2 rice-0(is an open type ship stern), △ d s=0.24 meter
h T=1.74 meters
5.9 tons of real tensile force for boat column, push away 10.5 kilometers of speed of a ship or plane degree/time, push away 1500 tons of cargo capacitys.
Sichuan Province shipping office No. 12 ships of river bullock are non-mozzle screw propeller, and the flow field concrete parameter of stern type that adopts the present invention to propose is as follows:
L WL=26 meters, beam B=5.2 rice, D=1.25 rice
D=1.5 rice, power Ne=2 * 110 kilowatt
Ship stern parameter:
L 1/L WL＝0.385，θ 1＝14.7°
θ 2=13 °, L ' 2=2.15 meters
△ d '=0.1 meter, △ d s=0.2 meter
h T=1.57 meters
4.3 tons of the positive bollard pulls of real ship, 15 kilometers of Design Speeds/time.
12.66 kilometers of towage speed/time, 3.1 tons of towing tensions, 20.7 kilometers of sailing speeds/time.
The flow field stern type that adopts the present invention to propose, when being used as pusher train when using the combination of mozzle screw and all kinds of rudder, with relatively its kiloton kilometer cost of transportation reduction more than 40% of existing common boat team, kiloton kilometer fuel consumption reduces more than 40%, with regard to the unit push boat, navigation thrust can improve 10-25%. When using the combination of non-mozzle screw and all kinds of rudder, compare kiloton kilometer cost of transportation reduction 8-15% with adopting common ship stern, kiloton kilometer fuel consumption reduces 10-17%. Single ship thrust improved 7-17% when rudder was capable.
The flow field ship stern that the present invention proposes compares with the boats and ships of weight, middle load, the restricted common power ship stern of airscrew diameter, gives meter kiloton kilometer cost and can reduce by 8%, and kiloton kilometer fuel consumption can reduce about 10%, and navigation thrust can improve 5-10%.

Claims (4)

1, a kind of boats and ships stern type, it is characterized in that, this boats and ships stern type be a kind of stern type and screw propeller, rudder for ship are taken into consideration so that in the speed in the ship stern flow field that forms and the propelling unit momentum theory that distribution of pressure satisfies ship in the propulsion coefficient expression formula to increase rotor disk area A.Increase incoming flow V AAnd raising propulsion coefficient n AjThe stern type that requires of theory.
Described propulsion coefficient expression formula is:
η Ai = 2 1+ 1+σ＇T
σ ＇ T=wherein T i 1 2 ·ρ·Ao·V 2 A
n Aj-desirable propulsion coefficient;
T j-thrust;
ρ-water tightness;
A 0-propeller disc area;
V A-oar the place ahead incoming flow.
2, according to the described boats and ships stern of claim 1 type, it is characterized in that, the base model of this stern type is: the stern type vertically cross-sectional profile shape at each position is approximate arch, this cross-sectional profile shape has the garden cambered top end in the screw propeller region, along with front and back are gradually mild away from garden, the top arc of the stern shape cross section shape at screw propeller place, dome height also descends thereupon, the both sides of each cross-sectional profile shape are connected with straight shipboard face transition glossily, the arch span of each cross-sectional profile shape is different, place, side broad in face of the oar, asymptotic oar card and reducing gradually rearward increases again gradually from the oar card.Stern type elevation profile contour shape is can play half mozzle effect and can form the tunnel-like of shrinking a fluid stream of rotation to the ship stern.
3, according to the described boats and ships stern of claim 2 type, it is characterized in that, these boats and ships, stern type can be stern end points surface the open type tunnel-like of height △ d or the enclosed tunnel-like that the stern end points immerses underwater degree of depth △ d ', and boats and ships stern when navigating of open type tunnel-like stern type is equipped with the stern cover plate.
According to the described boats and ships stern of claim 3 type, it is characterized in that 4, the basic specification scope of this boats and ships stern type is as follows:
L 1/L WL＝0.3-0.6;
D/d＝1.0-1.4;
L ' 2=1D-2D(is for enclosed stern end);
L 2=1D-1.5D(is for open type stern end);
θ 1＝13°-25°;
θ 2≤14°;
△ d ' should be below 0.1 meter for sinking to the drauht amount enclosed stern end, or 0.1 meter;
△ d opposite opened stern end exceeds that the drauht amount should be more than 0.05 meter or 0.05 meter;
△ d s〉=0.2 meter
Wherein:
L 1-large radius-depth is than length of tunnel,
L WL-boats and ships waterline length,
L 2, L ' 2-propeller center line to the stern end distance from,
θ 1-tunnel plays lift angle,
θ 2-to the stern angle of run,
The distance of the heavy deep water line in △ d '-stern end,
△ d-stern end exceeds the waterline distance,
△ d s-stern shipboard is heavy dark,
The d-drauht,
The D-diameter of propeller.
CN89102251A 1989-04-17 1989-04-17 Flow-field stern shape suitable for the propulsion of ship with large radius-depth ratio Expired - Fee Related CN1019961C (en)

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Application Number Priority Date Filing Date Title
CN89102251A CN1019961C (en) 1989-04-17 1989-04-17 Flow-field stern shape suitable for the propulsion of ship with large radius-depth ratio

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Application Number Priority Date Filing Date Title
CN89102251A CN1019961C (en) 1989-04-17 1989-04-17 Flow-field stern shape suitable for the propulsion of ship with large radius-depth ratio

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CN1036734A true CN1036734A (en) 1989-11-01
CN1019961C CN1019961C (en) 1993-03-03

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996005096A1 (en) * 1994-08-13 1996-02-22 Zhencheng Chen Water surface ship
CN1044991C (en) * 1994-08-13 1999-09-08 陈振诚 Flying fish type waterborne craft hull
JP2012056552A (en) * 2010-09-13 2012-03-22 Naoya Ogawa Reduction in oscillation of vessel by truncated chevron shaped stem catamaran type streamline shape and rudder arrangement
CN102963497A (en) * 2012-11-20 2013-03-13 江苏科技大学 Stern transom plate-free ship line and balanced rudder blade
CN107187544A (en) * 2017-04-24 2017-09-22 中国舰船研究设计中心 A kind of automatic creation system of hull cross section structure
CN110901868A (en) * 2019-12-05 2020-03-24 英辉南方造船（广州番禺）有限公司 Shallow draft ship

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996005096A1 (en) * 1994-08-13 1996-02-22 Zhencheng Chen Water surface ship
CN1044991C (en) * 1994-08-13 1999-09-08 陈振诚 Flying fish type waterborne craft hull
JP2012056552A (en) * 2010-09-13 2012-03-22 Naoya Ogawa Reduction in oscillation of vessel by truncated chevron shaped stem catamaran type streamline shape and rudder arrangement
CN102963497A (en) * 2012-11-20 2013-03-13 江苏科技大学 Stern transom plate-free ship line and balanced rudder blade
CN102963497B (en) * 2012-11-20 2015-06-17 江苏科技大学 Stern transom plate-free ship line and balanced rudder blade
CN107187544A (en) * 2017-04-24 2017-09-22 中国舰船研究设计中心 A kind of automatic creation system of hull cross section structure
CN110901868A (en) * 2019-12-05 2020-03-24 英辉南方造船（广州番禺）有限公司 Shallow draft ship

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