CN2377170Y

CN2377170Y - Tailpiece ship

Info

Publication number: CN2377170Y
Application number: CN99206694U
Authority: CN
Inventors: 吴大文
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-04-06
Filing date: 1999-04-06
Publication date: 2000-05-10
Anticipated expiration: 2009-04-06

Abstract

The utility model provides a tailpiece ship, belonging to the manufacturing technology for ships. The utility model is characterized in that the tail of the ship is designed into a vertical surface which is connected with a horizontal ship bottom plate; the tail is provided with tail wings; an air passage is arranged between the ship tail and the tail wings; the part of the tail wings below water is designed into a paraboloid shape. When the ship carries out sailing, the tail can not generate a negative pressure zone of which the pressure is less than atmosphere pressure; however, the tail of a conventional ship can generate a negative pressure zone when carrying out sailing so that the average value of the pressure for the whole tail is negative-pressure value. Thus, the utility model has the advantages of reducing the differential pressure of ship head and the ship tail and raising the sailing speed during the sailing of the ship.

Description

Tailpiece ship

The utility model relates to the shipbuilding technology.

In the prior art, boats and ships mainly are divided into come-up type fast boat and conventional ship two classes of discharge type.Come-up type fast boat has air cushion vehicle, hydrofoil boat and glide ship etc., all or part of emersion water surface during this class ship navigation, water improves the speed of a ship or plane to the pressure drag that head and the tail produce when reaching elimination or reducing ship's navigation, because manufacturing cost costliness, poor stability during navigation and can not extensively promoting more can't manufacture big ship.It is the bulbous bow type that conventional ship mainly contains the large-tonnage stem, afterbody is a wedge type, as Fig. 1, and the head and the tail of little tonnage all adopt the barge type, as Fig. 2, the conventional ship resistance of this class has air resistance, the viscous force of water, head and the tail pressure drags etc., wherein pressure drag is the principal element that ship speed can not improve.At present, the stem of conventional boats and ships is through long-term improve (as the bulbous bow type of large-tonnage ship), and head is pressed with institute and descends, but tail presses and can't improve, and the pressure drag of head and the tail can't have breakthrough decline, therefore improves the just energy actv. raising speed of a ship or plane of afterbody pressure.

The purpose of this utility model is to improve the buttock shape, increases by an empennage more on the quarter, and the kinetic energy that stern stays when receiving ship's navigation with empennage increases afterbody pressure, improves the speed of a ship or plane thereby reduce pressure drag.In order to show Tailpiece ship afterbody pressure, give the size of conventional quarter of a ship pressure earlier and distribute and do a qualitative analysis greater than conventional ship.

Fig. 3 is a barge (center buttock figure) afterbody pressure size and distribution graph when navigating by water with speed V.Fine line is the pressure regional boundary line among the figure, and heavy line is the afterbody form line, and long and short dash line is a water line.Be shaded area between fine line and the outline line, the arrow points outline line of shaded area is greater than a standard atmospheric pressure, and the arrow points fine line of shaded area is less than a standard atmospheric pressure, is called zone of negative pressure, the current of zone of negative pressure advance with ship, and with the form consumed energy of vortex.The length of arrow line segment is represented the size of pressure absolute value, fine line and outline line intersect at the N point, the pressure that N is ordered equals a standard atmospheric pressure, when the ship double ring ahead, the N point just moves down, otherwise on move, when speed is zero, the N point rises to water line, that is to say that afterbody did not have zone of negative pressure when boats and ships were static, ship's navigation has a speed of determining to make that the pressure sum in pressure district is a standard atmospheric pressure about the N point certainly, and must be less than a standard atmospheric pressure greater than this speed pressure sum.Proving this conclusion, is zone of negative pressure more than the N point when needing only the proof ship's navigation, and not preventing doing a simple experiment proves.

Be connected with water tap with a flexible pipe, open running water valve, make water have a speed to flow out from the mouth of pipe of horizontal positioned, as Fig. 4, state behind the current outlet spout as can be seen, use again similar in appearance to the thumb of barge afterbody type shape and be attached to mouth of pipe place, as Fig. 5, current rise along thumb as can be seen, the regional pressure that current rise is the zone of negative pressure less than a standard atmospheric pressure, this is that the zone of negative pressure of formation is filled by water because thumb air is down taken away (air and water have friction force when moving) by current, and this zone of negative pressure enlarges with the speed increase of current.Do same test as if an angle that the mouth of pipe is inclined upwardly, come to the same thing.This has just proved that the above zone of above-mentioned N point is the zone of negative pressure conclusion, after the afterbody geometric configuration that has proved the boats and ships lower aprons is equally determined, a definite speed is always arranged, make the afterbody average pressure equal a standard atmospheric pressure, and during greater than this speed of determining less than a standard atmospheric pressure, and speed is big more, and average pressure is more little.Here it is, and boats and ships can not improve the one of the main reasons of the speed of a ship or plane effectively.The wedge type stern is identical with it, repeats no more here.

The utility model is conventional stern to be made into tailgate be connected with base plate is vertical, and point of connection N place is a wedge angle, and as Fig. 6, designed draft is h.When ship with

Speed when navigation, with the ship is reference system, can find out that wake flow all breaks away from tailgate, from the N point with parabolic shape jet backward, see that the fine line among the figure (do not consider stern both sides current direction intermediate flow here, and hull bottom current viscous force is to the influence of wake shape, because this influence is less important).This wake flow is a kind ofly to transfer the energy of kinetic energy to by potential energy, as not utilizing, will on the quarter consume with wave pattern.Therefore an empennage on the quarter is set comes received energy, as Fig. 7, the quarter of a ship average pressure is increased, and head and the tail pressure reduction reduces, and reaches the purpose of effective raising ship's speed.

Be further described below by drawings and Examples.

Fig. 8 is the utility model embodiment scheme drawing.

(1) is hull among the figure, and an empennage (3) is set behind the stern (2), is provided with air by-pass passage (4) between stern and the empennage, and air by-pass passage can make atmosphere pass through swimmingly and arrive the NA place.Stern is connected with rod member or alternate manner with empennage, as long as can guarantee rigidity, this figure does not add expression.Empennage absorbs water following partial design and becomes empennage parabola (5), and the empennage parabola determines according to designed speed V, and it is mild to navigate by water formed wake flow parabola (6) than no Tailpiece ship with speed V.When ship accelerated to V with zero velocity, the water level of air by-pass passage also was to drop to NA from horizontal surface, and the pressure under this state on the empennage parabola is shown in shaded area among the figure, all more than or equal to atmospheric pressure (2 of AB equal atmospheric pressure).

According to Fig. 8 (center buttock figure) scheme drawing, this Tailpiece ship can be made into broad, hull that hull bottom is more flat, and does not influence the empennage function.

If the power of newly-increased ship makes ship's speed V increase, a speed Vm (Vm＞V) is always arranged, make the wake flow under the empennage parabola all break away from this parabola, at this moment fill up (as shown in Figure 9) by air between the parabolic and wake flow parabola of empennage, and be communicated with atmosphere behind air by-pass passage and the empennage.The paraboloidal pressure of this state empennage equals a standard atmospheric pressure.If close air by-pass passage, the static relatively waters of boats and ships has speed to begin, and the B point just produces zone of negative pressure, and along with the raising of ship's speed is expanded to the A point, until the N point, this state is identical with conventional ship.Therefore air by-pass passage is used in combination with empennage and can effectively improves ship's speed.

In sum, air by-pass passage and empennage are emphasis of the present utility model, compare with conventional ship, the stern of this utility model does not produce zone of negative pressure, so afterbody pressure increase (comparing with conventional ship), and head and the tail pressure reduction reduces widely, ship's speed obtains actv. and improves, and manufacturing cost does not increase, and can use on the boats and ships of tonnage that vary in size economic benefit and obvious social benefit widely.

Claims

Tailpiece ship is established an empennage after comprising stern, it is characterized in that, is provided with the air by-pass passage that can be communicated with atmosphere between stern and the empennage, and the empennage lower apron is designed to the empennage parabolic shape.