KR100528241B1 - Air bubble removal method for model ship of towing tank and its apparatus - Google Patents

Air bubble removal method for model ship of towing tank and its apparatus Download PDF

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Publication number
KR100528241B1
KR100528241B1 KR10-2000-0064823A KR20000064823A KR100528241B1 KR 100528241 B1 KR100528241 B1 KR 100528241B1 KR 20000064823 A KR20000064823 A KR 20000064823A KR 100528241 B1 KR100528241 B1 KR 100528241B1
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South Korea
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model ship
tank
towing tank
model
towing
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KR10-2000-0064823A
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Korean (ko)
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KR20020034037A (en
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강선형
고석천
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현대중공업 주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/18—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with elements moving in a straight line, e.g. along a track; Mobile sprinklers

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)

Abstract

본 발명은 예인수조 모형선 선저위치에서 모형선의 기포제거 방법 및 장치에 관한 것으로 예인수조의 모형시험에서 데이터 취득의 안정성 및 정도향상을 위하여 모형선 선저에 부착되는 기포를 제거하는 기술이다.The present invention relates to a method and apparatus for removing a bubble of a model ship at the bottom position of a towing tank model ship, a technique for removing bubbles attached to the bottom of the model ship to improve the stability and accuracy of data acquisition in the model test of the towing tank.

예인수조의 트리밍탱크(1) 측벽에 상하 높이 조절식이며 물분사용 노즐(3)(3')이 일정 간격으로 설치된 파이프(2)를 모형선의 선미쪽으로 물 분사되게 한 것을 특징으로하는 예인수조 모형선 선저위치에서 모형선의 기포제거 장치와 예인수조의 트리밍탱크의 예인전차에서 모형선을 탈착하지 않고 트리밍탱크 내를 전/후방향으로 천천히 이동하면서 기포제거장치에서 분사되는 강한 물분사로 모형선에 부착된 기포를 강제 제거시키게 하는 것을 특징으로 하는 예인수조의 모형선 선저위치에서 모형선의 기포제거 방법으로 완성되어 있다.Towing tank model ship characterized in that the pipe (2) having vertical height adjustment on the side wall of the trimming tank (1) of the towing tank and water spray nozzles (3) (3 ') installed at regular intervals is sprayed to the stern of the model ship. It is attached to the model ship by the strong water spray sprayed from the bubble removing device while moving forward and backward slowly in the trimming tank without detaching the model ship from the towing tank of the model ship and the trimming tank of the towing tank at the bottom position. Completed by the method of removing the bubbles of the model ship at the bottom position of the model ship of the towing tank, characterized in that the forced bubbles are removed.

Description

예인수조의 모형선 선저위치에서 모형선의 기포제거 방법과 장치 {Air bubble removal method for model ship of towing tank and its apparatus} Air bubble removal method for model ship of towing tank and its apparatus

본 발명은 예인수조 모형선 선저위치에서 모형선의 기포제거 방법과 장치에 관한 것으로 더 상세하게는 예인수조의 모형시험에서 데이터 취득의 안정성 및 정도향상을 위하여 모형선 선저에 부착되는 기포를 제거하는 기술이다.The present invention relates to a method and apparatus for removing bubbles from a model ship at the bottom of a towing tank model ship, and more particularly, to remove bubbles attached to the bottom of a model ship to improve the stability and accuracy of data acquisition in a model test of a towing tank. to be.

선박이 앞으로 나아가고자 할 때는 물의 저항을 받게 되고 이를 극복하기 위해서 프로펠러는 추력을 발생시켜야 한다. 이러한 실제 선박이 주어진 속도에서 전진할 때 받는 힘과 이에 필요한 추력을 알기 위해서 선박의 축적모형선을 만들어 예인수조에서 예인실험을 하여 모형상태의 힘과 추력을 계측하게 된다.When the ship wants to move forward, it is subject to water resistance and the propeller must generate thrust to overcome it. In order to know the force received when moving the ship at a given speed and the required thrust, the ship's accumulation model ship is made and the towing test is carried out in the towing tank to measure the force and thrust of the model state.

예인수조의 수조수에는 공기가 녹아 있게 되는데, 여름철과 같이 수조수의 온도가 상승하는 경우 공기용해도가 감소하여 수조수는 과포화상태가 되고 이에 따라 모형선의 선저표면에 기포가 부착된다. 이러한 기포를 제거하지 않은 상태에서 모형시험이 수행되는 경우, 선체표면의 조도가 변화하게 되어 잘못된 계측데이타를 취득하게 되고, 결과적으로 예인수조 모형시험 계측데이타의 안정성 및 정도를 떨어뜨리는 원인이 된다. 또한 계측된 데이터의 신뢰성 검증을 위하여 다수의 재시험이 이루어 짐으로써 경제적, 시간적 낭비를 초래하는 문제점이 있었다.Air is dissolved in the tank water of the towing tank. When the temperature of the tank water rises, as in the summer, the air solubility decreases and the tank becomes supersaturated, and thus bubbles are attached to the bottom surface of the model ship. If the model test is carried out without removing such bubbles, the roughness of the hull surface will change, resulting in incorrect measurement data, and as a result, the stability and accuracy of the towing tank model test measurement data will be reduced. In addition, a number of retests have been made to verify the reliability of the measured data, causing a problem of economic and time wasting.

본 발명은 예인수조 모형시험중 모형선 선저표면에 부착된 기포 제거목적의 장치를 예인전차의 출발위치에 해당하는 트리밍탱크 출구에 설치하고 적절한 운용법을 통해 모형시험 데이터 취득의 안정성과 정도향상을 기할 수 있는 예인수조의 모형선 선저위치에서 모형선의 기포제거 장치를 제공함을 목적으로 한다. The present invention is to install the device for the purpose of removing bubbles attached to the bottom surface of the model ship during the towing tank model test at the exit of the trimming tank corresponding to the starting position of the towing tank, and to improve the stability and accuracy of model test data acquisition through the appropriate operating method. An object of the present invention is to provide a bubble removing device of a model ship at a position of a ship bottom of a towing tank.

본 발명의 구성은 다음과 같다.The configuration of the present invention is as follows.

예인수조 트리밍탱크(1)내에 물을 흘려 보낼 수 있는 파이프(2)를 설치하고 이 파이프(2)에 일정간격으로 노즐(3)(3')을 설치하여 선저표면(4)쪽으로 강한 물흐름을 만들어 줌으로써 모형선의 선저표면에 부착된 기포를 강제적으로 제거할 수 있게 구성시킨 것이다.A pipe (2) is installed in the towing tank trimming tank (1), and nozzles (3) and (3 ') are installed in the pipe (2) at regular intervals to ensure strong water flow toward the bottom surface (4). By constructing, the bubble attached to the bottom surface of the model ship can be forcibly removed.

또한, 예인수조의 트리밍탱크의 예인전차에서 모형선을 탈착하지 않고 트리밍탱크 내를 전/후방향으로 천천히 이동하면서 기포제거장치에서 분사되는 강한 물분사로 모형선에 부착된 기포를 강제 제거시키게 하는 것을 특징으로 하는 예인수조의 모형선 선저위치에서 모형선의 기포제거 운용 방법에 관한 것이다.In addition, in the towing tank of the towing tank, the tank attached to the model ship is forcibly removed by a strong water spray sprayed from the bubble removing device while slowly moving forward and backward in the trim tank without removing the model ship. It relates to a method of removing the bubble of the model ship at the bottom position of the model ship of the towing tank.

본 발명을 보다 쉽게 이해하고 그 장점을 명백히 하기 위해서 실시 예를 첨부도면을 이용하여 상세히 설명하면 다음과 같다.In order to more clearly understand the present invention and the advantages thereof, the embodiments will be described in detail with reference to the accompanying drawings.

도 1 은 모형선 선저표면에 부착되는 기포의 형태를 보여 주고 있다. 기포의 크기와 상관없이 일단 발생된 기포는 인위적으로 제거시키기 전에는 계속 부착되어 있고, 제거후에도 일정 시간이 경과되면 다시 발생되어 부착된다. 이렇게 발생된 기포는 모형선 예인중에도 모형선 선저 표면에 고착되어 선체표면의 조도를 바꾸어 주는 효과를 주게 되고 계측되는 데이터를 부정확하게 한다.Figure 1 shows the form of bubbles attached to the bottom surface of the model ship. Regardless of the size of the bubbles, the bubbles once generated continue to be attached before being artificially removed, and are generated and attached again after a certain time after removal. Bubbles generated in this way are stuck to the bottom of the model ship during towing and give the effect of changing the roughness of the hull surface and inaccurate the measured data.

도 2 는 예인수조의 트리밍탱크(1)내에 설치되는 파이프(2)의 개략도이다. 고압펌프를 이용하여 수조수를 끌어 들이고 이를 파이프(2)에 설치된 노즐(3)(3')을 통해 물을 뿜어 강한 물흐름을 만들게 된다. 설치되는 파이프(2)의 폭은 예인수조 모형시험 준비에 사용되는 트리밍탱크(1)에 맞도록 설치하고, 설치되는 노즐간격은 가급적 촘촘하게 한다. 모형선에 따라 깊이가 다르므로 이를 조절하기 위해서 파이프전체를 수조벽에서 위아래로 움직일 수 있는게 일반적인 승강 메카니즘을 대입한 구조로 되어 있다. 기포를 제거하기 위해서 모형선을 예인전차에서 분리시키지 않고 트리밍 탱크까지 모형선을 후진시켰다가 출발시 이 장치를 통과하면서 강한 물의 수압에 의해서 모형선에 부착된 기포를 제거시키고 계측을 위한 출발이 이루어 진다. 파이프에 설치된 노즐의 방향은 선저에 수직한 방향으로부터 선미방향으로 약간 경사를 주어 모형선이 진행함에 따라 기포들이 선미쪽으로 밀려가는 효과도 주도록 한다.2 is a schematic view of the pipe 2 installed in the trimming tank 1 of the towing tank. By using a high pressure pump to draw the tank water and spray it through the nozzle (3) (3 ') installed in the pipe (2) to create a strong water flow. The width of the pipe (2) to be installed is installed so as to match the trimming tank (1) used for preparation of the towing tank model test, and the nozzle spacing to be installed is as tight as possible. Since the depth varies depending on the model line, the general pipe lifting mechanism is used to move the whole pipe up and down the tank wall to control this. In order to remove the bubbles, the model ship was retracted to the trimming tank without separating the model ship from the towing tank, and it passed through the device at the start to remove the air bubbles attached to the model ship by the strong water pressure. Lose. The direction of the nozzle installed in the pipe is slightly inclined from the direction perpendicular to the stern to the stern direction, so that bubbles are pushed toward the stern as the model ship proceeds.

도 3 에서는 이러한 기포제거장치를 이용하는 방법을 개략적으로 설명하고 있다. 도면에서와 같이 물을 분사시키는 상태에서 모형선을 낮은 속도로 예인하여 기포제거장치를 통과시키게 되면 모형선 선저표면에 고착되는 기포가 모형선 표면을 따라 선미쪽으로 강제적으로 밀려가면서 제거된다.3 schematically illustrates a method of using such a bubble removing device. As shown in the drawing, when the model ship is towed at a low speed while passing water through the bubble removing device as shown in the drawing, bubbles stuck to the bottom surface of the model ship are forcibly pushed toward the stern along the model ship surface and removed.

도 4에서는 이러한 기포제거장치를 사용하여 모형선의 저항을 계측한 예를 보여 주고 있다. 본 실험에서 사용된 모형선은 실험대상 선박의 1/50.4 축척을 갖는 모형선으로서, 길이 6.34m, 폭 1.39m, 높이 0.51m, 흘수 0.33m 제원을 갖는 모형선이 사용되었다. 또한, 실험조건으로서 기온 27℃, 트리밍 탱크내의 수온 19℃, 습도 80%이며, 실제 선박의 운항속도를 고려하여 1.014~1.377(m/sec)의 범위내에서 서로 다른 11개의 속도에 대해 저항실험을 수행하였다. 이러한 저항실험은 기포가 부착된 상태와 본 발명의 기포제거장치를 사용하여 기포가 제거된 상태로 나누어 수행되었다. 모형선의 저항을 무차원계수인 전저항계수(Ctm)로 계산하여 도 4의 수직축으로 나타내었고, 모형선의 속도로부터 계산되는 무차원계수인 레이놀드수(Rn)를 계산하여 도 4의 수평축으로 나타내었다.도 4에서 볼 수 있는 바와 같이, 본 발명의 기포제거장치를 사용하여 기포가 제거된 경우가 기포가 제거되지 않은 경우와 비교하여 계측데이터의 안정성 및 정도가 향상됨을 볼 수 있다.Figure 4 shows an example of measuring the resistance of the model ship using such a bubble removing device. The model ship used in this experiment was a model ship with a scale of 1 / 50.4 of the ship to be tested. A model ship with a length of 6.34m, a width of 1.39m, a height of 0.51m, and a draft of 0.33m was used. In addition, as the experimental conditions, the temperature is 27 ℃, the water temperature 19 ℃ in the trimming tank, the humidity 80%, the resistance test for 11 different speed within the range of 1.014 ~ 1.377 (m / sec) in consideration of the actual speed of the ship Was performed. This resistance test was performed by dividing the bubble attached state and the bubble is removed using the bubble removing device of the present invention. The resistance of the model line is calculated by the total resistance coefficient (Ctm), which is a dimensionless coefficient, and is represented by the vertical axis of FIG. 4, and the Reynolds number (Rn), which is calculated from the speed of the model line, is represented by the horizontal axis of FIG. 4. As can be seen in Figure 4, it can be seen that the bubble is removed using the bubble removing device of the present invention compared to the case where the bubble is not removed, the stability and accuracy of the measurement data.

(변형예, 응용예 및 법적해석)(Variants, applications and legal interpretations)

본 발명은 상술한 특정한 바람직한 실시예와 변형예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 누구든지 다양한 설계변경적 실시가 가능한 것은 물론이고, 그와 같은 변경은 청구범위 기재의 범위내에 있게 된다.The present invention is not limited to the above specific preferred embodiments and modifications, and any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims can make various design changes. Of course, such changes are within the scope of the claims.

상기와같이 본 발명은 예인수조에 설치되는 기포제거장치를 이용함으로써 모형시험의 신뢰도를 향상시킬 수 있으며, 공기함유량 조절을 위한 과도한 시설투자의 생략과 재시험에 따른 모형시험비용을 절감할 수 있다. As described above, the present invention can improve the reliability of the model test by using the bubble removing device installed in the towing tank, and can reduce the model test cost according to the omission of excessive facility investment and retest for adjusting the air content.

도 1은 기포제거용 간이장치를 사용하지 않는 경우에 모형선 선저에 부착되는 기포의 예1 is an example of bubbles attached to the bottom of the model ship when not using a simple bubble removing device

도 2은 기포제거용 간이장치의 개략도Figure 2 is a schematic diagram of a simple device for removing bubbles

도 3은 본 발명에서 적용된 기포제거용 간이장치의 사용 예Figure 3 is an example of the use of a simple apparatus for removing bubbles applied in the present invention

도 4는 본 발명에서 적용된 기포제거용 간이장치 사용 전후의 예인수조 모형시험 결과 사례Figure 4 is a case of the towing tank model test results before and after using the bubble removing simple device applied in the present invention

<도면의 주요부분에 대한 부호의 설명><Description of Symbols for Main Parts of Drawings>

1 : 트리밍 탱크 2 : 파이프1: trimming tank 2: pipe

3, 3' : 노즐 4 : 선저표면3, 3 ': nozzle 4: bottom surface

5 : 기포 6 : 고압펌프5: bubble 6: high pressure pump

Claims (2)

예인수조의 트리밍탱크(1) 측벽에 상하 높이 조절식이며 물분사용 노즐(3)(3')이 일정 간격으로 설치된 파이프(2)를 모형선의 선미쪽으로 물 분사되게 한 것을 특징으로하는 예인수조 모형선 선저위치에서 모형선의 기포제거 장치 Towing tank model ship characterized in that the pipe (2) having vertical height adjustment on the side wall of the trimming tank (1) of the towing tank and water spray nozzles (3) (3 ') installed at regular intervals is sprayed to the stern of the model ship. Bubble removing device of model ship at bottom position 예인수조의 트리밍탱크의 예인전차에서 모형선을 탈착하지 않고 트리밍탱크내를 전/후방향으로 천천히 이동하면서 기포제거장치에서 분사되는 강한 물분사로 모형선에 부착된 기포를 강제 제거시키게 하는 것을 특징으로하는 예인수조의 모형선 선저위치에서 모형선의 기포제거 방법In the towing tank of the towing tank, the tank attached to the model ship is forcibly removed by the strong water spray sprayed from the bubble removing device while slowly moving forward and backward in the trim tank without removing the model ship. Method of removing bubble from model ship at the bottom of model ship in towing tank
KR10-2000-0064823A 2000-11-02 2000-11-02 Air bubble removal method for model ship of towing tank and its apparatus KR100528241B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101205172B1 (en) 2011-02-15 2012-11-27 서울대학교산학협력단 Tracer particle spraying apparatus for particle image velocimetry in towing tank
KR101480010B1 (en) * 2013-07-16 2015-01-07 대우조선해양 주식회사 venting system using air ejector

Citations (4)

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Publication number Priority date Publication date Assignee Title
US3964316A (en) * 1974-12-23 1976-06-22 Rohr Industries, Inc. Wave motion simulator
JPS58190433U (en) * 1982-06-14 1983-12-17 三菱重工業株式会社 Aquarium water temperature adjustment device
JPS62111640A (en) * 1985-11-08 1987-05-22 Showa Sangyo Kk Production of snack food
US4899580A (en) * 1987-08-13 1990-02-13 Etat Francais Represente Par Le Delegue General Pour L'armement Device for measuring the wake of a sailing model

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964316A (en) * 1974-12-23 1976-06-22 Rohr Industries, Inc. Wave motion simulator
JPS58190433U (en) * 1982-06-14 1983-12-17 三菱重工業株式会社 Aquarium water temperature adjustment device
JPS62111640A (en) * 1985-11-08 1987-05-22 Showa Sangyo Kk Production of snack food
US4899580A (en) * 1987-08-13 1990-02-13 Etat Francais Represente Par Le Delegue General Pour L'armement Device for measuring the wake of a sailing model

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101205172B1 (en) 2011-02-15 2012-11-27 서울대학교산학협력단 Tracer particle spraying apparatus for particle image velocimetry in towing tank
KR101480010B1 (en) * 2013-07-16 2015-01-07 대우조선해양 주식회사 venting system using air ejector

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