KR101103547B1 - Cooling device of underwater moving body and underwater moving body having the same - Google Patents

Abstract

The present invention relates to a cooling device of an underwater vehicle and an underwater vehicle including the same, wherein the cooling device of the underwater vehicle includes an inlet portion through which fluid is introduced from the outside of the underwater vehicle, and an outlet portion formed on an outer surface of the underwater vehicle. And a heat exchange part configured to exchange heat with the cooling object mounted on the underwater moving body by the pressure difference between the inlet and the outlet, wherein the outlet part is configured to generate the pressure difference through flow separation. At least a portion is characterized in that protruding in the direction intersecting with the traveling direction of the moving object. As a result, the present invention provides a cooling device for an underwater vehicle in which fluid is naturally circulated without a separate power device.

Natural Circulation, Cooling System, Fluid Separation, Underwater Vehicle

Description

Cooling device of underwater vehicle and underwater vehicle having same {COOLING DEVICE OF UNDERWATER MOVING BODY AND UNDERWATER MOVING BODY HAVING THE SAME}

The present invention relates to a cooling apparatus for cooling a cooling object mounted on an underwater vehicle and an underwater vehicle having the same.

The moving body which moves at high speed underwater moves using the propulsion force by the propeller mounted inside. Generally, electric motors or engines are installed to drive propellers, and they are driven by large torque and rotational speeds to generate a large propulsion force, which generates a large amount of heat.

Heat generated from the motor or the engine may cause performance degradation and loss of function of the motor and the engine, and should be cooled by a separate cooling device to prevent this. The cooling device mainly adopts a method of moving the cooling water by forced circulation by a self-circulating pump and exchanging heat with the cooling water. The forced circulation system uses an additional pump to circulate the cooling water, resulting in energy loss and taking up internal space.

In particular, high power unmanned underwater vehicles, such as torpedoes, which are mainly used for military and industrial purposes, require cooling due to high heat, but devices for forced forced cooling are difficult to install due to the limitation of internal space. Therefore, the movement characteristics of the underwater vehicle and the natural cooling method using the external sea water can be considered.

One object of the present invention is to provide a cooling device for an underwater vehicle that is driven in a different form from the prior art, and an underwater vehicle having the same.

Another object of the present invention is to cool the cooling object of the underwater moving body by a natural cooling method, thereby improving the performance of the cooling object.

An apparatus for cooling an underwater vehicle according to an embodiment of the present invention for realizing the above object includes an inlet portion through which fluid is introduced from the outside of the underwater vehicle, an outlet portion formed on an outer surface of the underwater vehicle, and the The fluid is moved by the pressure difference between the inlet and the outlet portion and includes a heat exchanger is formed to exchange heat with the cooling object mounted on the underwater movement body, the outlet portion is the progress of the underwater movement body to generate the pressure difference through the flow separation At least a part protrudes in the direction crossing the direction.

According to an example associated with the present invention, the outlet includes an outlet and a protrusion. The outlet is disposed behind the inlet with respect to the traveling direction of the underwater vehicle. The protrusion protrudes in a direction intersecting with the traveling direction of the underwater vehicle in a portion adjacent to the outlet to generate the flow separation. The outlet portion is formed of a circular tube protruding from the outer surface of the underwater movement body in the direction intersecting with the traveling direction of the underwater movement body, the end of the circular tube is formed to be inclined in the traveling direction of the underwater movement body.

According to another example related to the present invention, the inlet includes an inlet and an inlet guide. The inlet is formed to be long in the advancing direction of the underwater vehicle at the outer surface of the underwater vehicle. Inlet guides extend from one side of the inlet to the inside of the underwater body to guide the fluid inlet.

According to another embodiment related to the present invention, the inlet has a front end and a rear end with respect to the traveling direction of the underwater vehicle, and the rear end is the same height as the imaginary surface extending from the front end through the rear end and the outer surface of the underwater vehicle. Is formed. The inflow guide is formed to be inclined with respect to the outer surface of the underwater vehicle in the direction of travel of the underwater vehicle.

In addition, the underwater vehicle according to another embodiment of the present invention, the body of the underwater movable body, the propulsion force generator is built in the main body, is formed to apply a driving force to the body, and the pressure of the inlet and outlet And the cooling device, the fluid being moved by the car and configured to exchange heat with the propulsion force generator.

According to another example related to the present invention, the main body includes a front end, a middle part and a tail. The distal end is formed at the distal end with respect to the traveling direction of the main body, the middle part is connected to the distal end and has at least a part of a constant cross section, and the rear end extends from the intermediate part so that the cross section gradually decreases with respect to the advancing direction of the main body. The outlet is arranged at the tail. The inlet portion may be disposed in the intermediate portion, and the outlet portion may be formed adjacent to a boundary between the rear portion and the intermediate portion.

The cooling device of the underwater moving body and the underwater moving body having the same according to the present invention configured as described above do not require a pump or the like since the cooling water is naturally circulated by the pressure difference between the inlet and the outlet. In addition, through this, the present invention can reduce or prevent additional energy consumption, and can obtain the effect of reducing the volume and weight of the underwater vehicle.

In addition, the present invention by the configuration or shape of the inlet and outlet, the pressure difference between the inlet and outlet to increase the natural circulation of the fluid.

Hereinafter, a cooling apparatus for an underwater vehicle and an underwater vehicle having the same will be described in detail with reference to the accompanying drawings. In the present specification, the same or similar reference numerals are assigned to the same or similar configurations in different embodiments, and the description thereof is replaced with the first description. As used herein, the singular forms "a", "an" and "the" include plural forms unless the context clearly indicates otherwise.

1 is a conceptual diagram showing the underwater vehicle 100 according to an embodiment of the present invention.

1 illustrates an example of a torpedo moving in the water as an example of the underwater vehicle 100, and as shown, the underwater vehicle 100 includes a main body 110, a propulsion force generator 120, and a cooling device 130. do.

The propulsion force generator 120 is embedded in the main body 110 of the underwater vehicle 100 and is formed to apply a propulsive force to the main body 110. The propulsion force generator 120 may be, for example, an electric motor or an engine, or the like, and a propeller rotated thereby. The propulsion force generator 120 generates heat by driving.

The cooling device 130 cools the propulsion generator 120 to mitigate or prevent performance degradation or loss of function of the propulsion generator 120 due to heat generation. The cooling device 130 is configured to cool the propulsion generator 120 by introducing a fluid in the water and to flow the fluid into the water.

The cooling device 100 includes an inlet 140, an outlet 150, and a heat exchanger 160.

The inlet 140 and the outlet 150 are formed on the outer surface of the underwater body 100, the inlet 140 is formed so that fluid flows from the outside of the underwater body 100 to the inside, the outlet 150 ) Is made to flow the introduced fluid into the water after cooling the propulsion generator (120).

The heat exchanger 160 moves the fluid by the pressure difference between the inlet 140 and the outlet 150, and is formed to exchange heat with the cooling object mounted on the underwater vehicle 100. The thrust generator is an example of a cooling object.

More specifically, the cooling device 130 is formed so that the fluid is moved by the pressure difference between the inlet 140 and the outlet 150, and heat exchange with the cooling object in the body (110). Since the natural circulation of the fluid is generated by the pressure difference between the inlet 140 and the outlet 150, there is no need for a circulation pump for forcibly feeding the fluid, thereby reducing the energy consumption, Volume and weight will be reduced.

The invention can be, for example, Bernoulli's equation, application of a pitot tube for measuring flow rate or flow rate and a pressure gauge for measuring pressure.

Bernoulli's equation is a steady state, incompressible fluid, and can be applied along a streamline when in frictionless, no shaft work and no heat transfer. Equation (1)

The Energy Grade Line (EGL) represents the magnitude of the total Bernoulli constant and has a constant size of z + p / ρg + V ² / 2g. The pitot tube, which is installed at the center of the tube to measure stagnation pressure, measures this total height.

The hydraulic grade line (HGL) represents the size, z + p / ρg, which corresponds to the sum of the height z and the pressure height p / ρg, and the pressure gauge installed on the wall inside the pipe measures this height.

Since the pitot pipe and the pressure gauge have a pressure difference corresponding to the height of V ² / 2g at the same height, connecting the two pipes through an appropriate pipe system can overcome the pressure difference loss caused by the pipe system. When large enough, the flow rate from the pitot tube to the pressure gauge can be obtained.

That is, the inlet 140 of the cooling device 130 may correspond to the pitot pipe, and the outlet 150 may correspond to the pressure gauge.

Hereinafter, the cooling device 130 of the underwater moving body of FIG. 1 will be described in more detail with reference to FIGS. 2A to 4B.

2A and 2B are a plan view and a cross-sectional view illustrating the inflow portion 140 of the cooling device 130 of FIG. 1, respectively, and FIG. 3 is a graph showing the flow rate for each flow rate of each inflow portion of FIG. 2B. Are plan and cross-sectional views respectively showing an outlet portion 150 of the cooling device 130 of FIG.

Referring to the drawings, the inlet 140 is formed so that the pressure of the fluid is generated, the outlet 150 is formed so that the pressure is lowered due to the fluid separation phenomenon occurs. Inlet 140 may be genuine to minimize the occurrence of cavities.

2A and 2B, the inlet 140 includes an inlet 141 and an inlet guide 142.

The inlet 141 is formed to be long in the advancing direction of the underwater vehicle 100 on the outer surface of the underwater vehicle 100 (see FIG. 1). More specifically, the inlet 141 is formed such that the length formed in the traveling direction of the underwater body 100 is longer than the width formed in the direction perpendicular to the traveling direction. The inlet 140 is formed in the direction crossing the outer surface of the underwater vehicle 100 from the inlet 141.

The inlet guide 142 extends into the inside of the underwater body 100 from one side of the inlet 141 to guide the inflow of the fluid. The inflow guide 142 is formed to be inclined with respect to the outer surface of the underwater vehicle 100 in the advancing direction of the underwater vehicle. That is, one end of the inflow guide 142 is connected to the portion defining the inlet 141 on the outer surface of the underwater body 100, the other end is connected to the portion defining the flow path of the heat exchanger 160 (see Fig. 1) Between both ends is inclined with respect to the outer surface of the underwater body (100).

The inlet 141 has a front end 141a and a rear end 141b with respect to the traveling direction of the underwater moving body, and a portion where the flow path of the inlet 140 and the heat exchanger 160 is adjacent to the rear end 141b. Is placed. That is, the inlet 140 is configured to gradually reduce the area of the portion adjacent to the tip 141a from the inlet 141 toward the flow path of the heat exchanger 160.

Referring to FIG. 2B, the rear end 141b is formed at the same height as the illustrated virtual surface 141c. The virtual surface 141c extends from the front end 141a to the rear end 141b and to the outer surface of the underwater vehicle. Through this, it is possible to further increase the stagnation pressure of the fluid flowing into the inlet 140.

3 is an experimental result showing the performance of four types of inlets. The experiment was carried out by placing an underwater vehicle of 0.354 m in diameter and 2.734 m in length in a cavitation tunnel whose test section specifications (L × B × H) were 6.0m × 1.2m × 1.2m, and adjusting the test flow rate in three to four steps (10, 15). , 20, 21 m / s), and the flow rate at the outlet was simultaneously measured using an ultrasonic flowmeter and a laser Doppler velocimetry (LDV).

Types 1, 2, and 3 in the drawings change the shape of the rear end 141b of the inlet 141 of FIG. 2B, and type 1 has the same slope as the surface of the underwater vehicle, and types 2 and 3 It is intended to protrude more than the surface of the hydrodynamic body so that more flow rate is introduced. Type 2 'is an enlarged area of the inner curved portion of the inlet 141 in the state that the rear end is the same as the shape of the rear end 141b of the type 2. As a result of the measurement, the flow rate of type 1 was the largest, and it can be seen that the rear end 141b of the inlet 141 is most effective when formed at the same height as the virtual surface 141c.

4A and 4B, the outlet 150 crosses the traveling direction of the underwater moving object 100 to generate a pressure difference between the inlet 140 and the outlet 150 through flow separation. At least a part is formed to protrude.

Outflow portion 150 is formed of a circular tube protruding in the direction intersecting with the direction of travel of the underwater vehicle 100 on the outer surface of the underwater vehicle 100, the end of the circular tube is inclined in the traveling direction of the underwater vehicle 100 It is formed to lose. In detail, the outlet 150 includes an outlet 151 and a protrusion 152.

Outlet 151 is disposed in the rear than the inlet with respect to the traveling direction of the underwater body, smaller than the inlet 141, and consists of a circular cross-section.

The protrusion 152 protrudes in a direction intersecting with the traveling direction of the underwater vehicle 100 in a portion adjacent to the outlet 151 so as to generate the flow separation. The protrusion 152 is disposed in front of the traveling direction of the underwater vehicle 100 at the outlet 151, and lowers the pressure around the outlet 151 through fluid separation due to the forward flow velocity of the underwater vehicle 100. Is formed. Since the fluid separation lowers the pressure at the outlet 151 than when there is no protrusion, a pressure difference greater than the pressure difference corresponding to the height of V ² / 2g occurs at the inlet 141 and the outlet 151. This pressure difference causes natural circulation of the cooled seawater.

Hereinafter, the underwater body to which the inlet 140 and the outlet 150 are applied will be described in more detail. FIG. 5 is a conceptual diagram illustrating a flow path of a fluid in the underwater vehicle according to the present invention, and FIG. 6 is a result of calculating the CFD (computational fluid dynamics) of the peripheral flow distribution of the underwater vehicle of FIG. 5.

The body 110 of the underwater body includes a front end portion 111, the middle portion 112 and the rear portion 113.

The tip portion 111 is formed at the tip end with respect to the traveling direction of the main body 110, the middle portion 112 is connected to the tip portion 111, at least a portion of a constant cross section.

The tail portion 113 extends from the middle portion 112 so that the cross section gradually decreases with respect to the traveling direction of the main body 110. That is, the tail portion 113 has a curved shape.

Referring to FIG. 5, the inlet part 140 is disposed in the middle part 112, and the outlet part 150 is disposed in the rear part 113. More specifically, the outlet portion 150 is formed adjacent to the boundary between the rear portion 113 and the middle portion 112.

According to FIG. 6, it can be seen that the pressure starts to drop from the end of the middle part 112, the minimum pressure occurs immediately after the start point of the rear part 113, and the pressure increases as it goes back. Therefore, a higher stagnation pressure is generated in the outlet portion 150 disposed close to the middle portion 112 in the tail portion 113. However, the present invention is not necessarily limited thereto. For example, in order to obtain the maximum flow rate, the outlet portion 150 is installed immediately after the rear portion 113 having the lowest pressure, and the inlet portion 140 is disposed at the high pressure portion of the rear portion 113. Can be.

Referring to FIG. 5, the inlet 141 is disposed at the rear end of the propulsion force generator 120 with respect to the traveling direction of the main body 110, and the inlet 140 is the propulsion force generator 120 inside the main body 110. Bent toward the tip of the The flow path of the cooling device 130 is formed to overlap each other to widen the propulsion force generator 120 and the heat exchange surface, and is connected to the outlet 150 from the propulsion force generator 120 so that the fluid is finished cooling.

The apparatus for cooling the underwater vehicle according to the present invention configured as described above and the underwater vehicle including the same increase the pressure difference between the inlet and the outlet by the configuration, the shape, or the position of the inlet and the outlet so that the natural circulation of the fluid is possible. do.

In addition, the cooling apparatus of the underwater moving body and the underwater moving body having the same are not limited to the configuration and method of the embodiments described above, the embodiments are all or part of each embodiment so that various modifications can be made It may alternatively be configured in combination.

1 is a conceptual diagram showing an underwater vehicle according to an embodiment of the present invention.

2A and 2B are a plan view and a sectional view of the inlet of the cooling device of FIG. 1, respectively.

Figure 3 is a graph showing the flow rate of each inlet flow rate of Figure 2b.

4A and 4B are a plan view and a sectional view of an outlet of the cooling device of FIG. 1, respectively.

5 is a conceptual diagram showing a path of fluid movement in the underwater vehicle according to the present invention.

6 is a result of calculating the CFD of the peripheral flow of the underwater vehicle of FIG.

Claims (9)

An inlet, through which fluid flows from the outside to the inside; An outlet portion formed on an outer surface of the underwater vehicle; And The fluid is moved by the pressure difference between the inlet and outlet, and includes a heat exchanger formed to exchange heat with the cooling object mounted on the underwater body, And the outlet portion protrudes at least a portion in a direction intersecting with a traveling direction of the underwater vehicle to generate the pressure difference through flow separation. The method of claim 1, The outlet portion, An outlet disposed at a rear side of the inflow portion with respect to a traveling direction of the underwater vehicle; And And a projection protruding in a direction intersecting with a traveling direction of the underwater vehicle in a portion adjacent to the outlet so as to generate the flow separation. The method of claim 1, The outlet portion is formed of a circular tube protruding from the outer surface of the underwater movement body in the direction intersecting with the traveling direction of the underwater movement body, the end of the circular tube is formed to be inclined in the traveling direction of the underwater movement body Chiller of the moving object. The method of claim 1, The inlet portion, An inlet formed to be long in an advancing direction of the underwater vehicle on an outer surface of the underwater vehicle; And Cooling apparatus of the underwater vehicle including an inlet guide extending from the one side of the inlet to the inside of the underwater vehicle to guide the fluid inlet. 5. The method of claim 4, The inlet has a front end and a rear end with respect to the traveling direction of the underwater vehicle, And the rear end is formed at the same height as the imaginary surface that extends from the front end to the outer end of the underwater moving body past the rear end. 5. The method of claim 4, And the inflow guide is inclined with respect to an outer surface of the underwater vehicle in the advancing direction of the underwater vehicle. A body of the underwater vehicle movable in water; A propulsion force generator built in the main body and formed to apply a propulsion force to the main body; And A fluid is moved by the pressure difference between the inlet and the outlet, and is formed to exchange heat with the propulsion force generator, and includes a cooling device according to any one of claims 1 to 6, The inlet is formed to introduce the fluid from the outside of the body to the inside, The outlet portion is formed on the outer surface of the body, at least a portion of the underwater moving body, characterized in that protruding in the direction crossing the traveling direction of the main body to generate the pressure difference through the flow separation. The method of claim 7, wherein The main body, A tip portion formed at the tip with respect to the traveling direction of the main body; An intermediate portion connected to the tip portion, the intermediate portion having at least a portion of a constant cross section; And An aquatic body, which extends from the middle part in a progressively decreasing cross section with respect to the traveling direction of the main body, and includes a rear end part at which the outlet part is disposed.  The method of claim 8, The inflow portion is disposed in the intermediate portion, the outlet portion is characterized in that the body is formed adjacent to the boundary between the rear portion and the intermediate portion.

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