JPH0894488A - Two layer flow tester - Google Patents

Two layer flow tester

Info

Publication number
JPH0894488A
JPH0894488A JP6232996A JP23299694A JPH0894488A JP H0894488 A JPH0894488 A JP H0894488A JP 6232996 A JP6232996 A JP 6232996A JP 23299694 A JP23299694 A JP 23299694A JP H0894488 A JPH0894488 A JP H0894488A
Authority
JP
Japan
Prior art keywords
density
water
flow
layer
low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP6232996A
Other languages
Japanese (ja)
Other versions
JP3025160B2 (en
Inventor
Takahiro Nishimura
考弘 西村
Tadashi Sekiguchi
忠司 関口
Original Assignee
Mitsubishi Heavy Ind Ltd
三菱重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Ind Ltd, 三菱重工業株式会社 filed Critical Mitsubishi Heavy Ind Ltd
Priority to JP6232996A priority Critical patent/JP3025160B2/en
Publication of JPH0894488A publication Critical patent/JPH0894488A/en
Application granted granted Critical
Publication of JP3025160B2 publication Critical patent/JP3025160B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE: To realize a flow or a two layer flow accompanying a mixing flow in the state close to actual flow by providing boards for partitioning a water channel into upper and lower stages on the upstream and downstream side in the water channel. CONSTITUTION: Boards 2 for partitioning a water channel 1 into upper and lower stages are disposed at the opposite ends thereof. Consequently, a high density layer is formed on the lower stage side while a low density layer is formed on the upper stage side thus producing a two layer flow. On the high density layer side, a multihole pipe 8 is coupled through a piping 18 with a circulation pump 9 at the opposite ends of the water channel 1 and thereby the delivery side of pump is located in the upstream while the suction side is located in the downstream. The low density layer is fed with water from a low density water tank 3 and the water is sucked therefrom by means of a discharge pump 10. High density water from a high density water tank 4 ejects through a small hole 7 made through a chamber 6 immediately in the downstream of a weir 5. In other words, the weir 5 and the chamber 6 are disposed on the opposite end sides of the water channel 1 to form a mixing zone thus generating a stratified flow of different density from any one of the opposite end sides of the waterchannel 1.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明は、淡水と海水とが合流す
る河口付近における流れの調査実験などに適用される二
層流試験装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-layer flow test apparatus applied to an experiment of a flow around a river mouth where fresh water and seawater join.
【0002】[0002]
【従来の技術】図3は淡水と海水とが合流する河口付近
における流れの調査実験などに使用されている従来の二
層流試験装置の説明図である。図において、一般に河口
付近には各種工場や発電所などが建設されており、これ
らの中には河川水や海水などを取水して使用し、再び河
川へ放流するものも多数あるため、用水として利用でき
るように水質の調査や水門を設けて流量の調整などを行
っている。また、河口付近では密度の異なる海水と淡水
とが合流して混合したり、再び分離して成層したりする
などし、そのうえ潮の干満による水位変化が加わること
によりその刻々の状況の変化は海水のみ、或いは淡水の
みなど単一密度の水質に比べて格段に複雑で挙動の把握
が困難である。
2. Description of the Related Art FIG. 3 is an explanatory view of a conventional two-layer flow test apparatus used for an experiment for investigating a flow in the vicinity of an estuary where fresh water and seawater join. In the figure, generally, various factories and power plants are built near the mouth of the river, and many of them use water such as river water and seawater, and then discharge it to the river again. The water quality is being surveyed so that it can be used, and a floodgate is installed to adjust the flow rate. In the vicinity of the estuary, seawater with different densities merges and mixes with freshwater, or separates and stratifies again. Moreover, the change in water level due to the ebb and flow of the tide causes changes in the situation every moment. It is much more complicated and it is difficult to understand the behavior as compared with the water quality of single density such as only water or only fresh water.
【0003】このため、従来は成層からの取水や放水な
ど流れの調査実験では影響力の主体を水の密度差と考
え、流れを与えずに成層のみを再現する従来の二層流試
験装置により取水や放水などの挙動を捕らえ、想定され
る流れの影響については別途に加味する方法が採られて
いる。また、取水や放水などの密度から流れの主体が成
層内の上層または下層の何れかであることが推定できる
ような場合には、その層における水の密度を抽出してこ
れを単一密度水の流れとして再現し、その単一密度水の
流れにおける取水や放水などの挙動を調査実験する。そ
して、後から成層状態における影響などを考察する方法
が採られている。
For this reason, conventionally, in a flow investigation experiment such as intake and discharge of water from a stratification, the main influence is considered to be the water density difference, and a conventional two-layer flow test apparatus that reproduces only the stratification without giving a flow. A method is adopted in which behaviors such as water intake and water discharge are captured, and the effect of expected flow is added separately. Also, if it can be estimated from the density of water intake or discharge that the main body of flow is either the upper layer or the lower layer in the stratification, the density of the water in that layer is extracted and this is calculated as the single density water. The behavior of intake and discharge in the single density water flow is investigated and tested. Then, a method of later considering the influence in the stratified state is adopted.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、近年は
地球的規模で環境保全に係わる関心が高まって行政によ
る指導が強化され、水質改善や影響予測などについても
一段と規制や要請などが厳しくなっている。従って、排
水の拡散や挙動などの予測調査においても、上記のよう
な従来の二層流試験装置により流れを省略して密度によ
る成層のみを再現する調査実験や、単層流として流れを
捕える調査実験などでは精度的にこれからの規制や要請
などに応じ切れなくなって来ている。
However, in recent years, there has been a growing interest in environmental conservation on a global scale, and the guidance by the government has been strengthened, and regulations and requests for water quality improvement and impact prediction have become more stringent. . Therefore, even in predictive investigations of diffusion and behavior of wastewater, investigation experiments that omit the flow and reproduce only stratification by density using the above-mentioned conventional two-layer flow test equipment, or investigations that capture the flow as a single-layer flow In experiments, etc., it has become impossible to accurately comply with future regulations and requests.
【0005】[0005]
【課題を解決するための手段】本発明に係る二層流試験
装置は上記課題の解決を目的にしており、水路内の上流
端および下流端にそれぞれ設けられ上記水路内を上段お
よび下段に仕切る仕切板と、上記上段の上流端に設けら
れ上記水路内の幅方向に均等に低密度水を給水して低密
度層の流れを発生させる第一の管と、上記下段の上流端
に設けられ上記水路内の幅方向に均等な高密度水の循環
を行って高密度層の流れを発生させる第二の管と、上記
第一の管の下流側に設けられ低密度層の流れに渦域を発
生させる堰と、上記第一の管の下流側に設けられ低密度
層の流れに高密度水を噴き込んで混合させるチャンバー
とを備えたことを特徴とする。
A two-layer flow test apparatus according to the present invention is intended to solve the above-mentioned problems, and is provided at the upstream end and the downstream end of a water channel, and divides the water channel into an upper stage and a lower stage. A partition plate, a first pipe provided at the upstream end of the upper stage to uniformly supply low density water in the width direction in the water channel to generate a flow of a low density layer, and a first pipe provided at the upstream end of the lower stage. A second pipe that circulates the high-density water uniformly in the width direction in the water channel to generate a high-density layer flow, and a swirl region in the low-density layer flow provided on the downstream side of the first pipe. And a chamber provided downstream of the first pipe for injecting high-density water into the flow of the low-density layer to mix them.
【0006】また、本発明に係る二層流試験装置におい
ては、水路内の上流端および下流端にそれぞれ設けられ
上記水路内を上段および下段に仕切る仕切板と、上記上
段の上流端に設けられ上記水路内の幅方向に均等に低密
度水を給水して低密度層の流れを発生させる第一の管
と、上記下段の上流端に設けられ上記水路内の幅方向に
均等な高密度水の循環を行って高密度層の流れを発生さ
せる第二の管と、上記第一の管の下流側に設けられ低密
度層の流れに渦域を発生させる堰と、上記第一の管の下
流側に設けられ低密度層の流れに高密度水を噴き込んで
混合させるチャンバーとを備えるとともに、上記第一お
よび第二の管と上記堰と上記チャンバーとを上記水路の
下流側にも設け低密度水および高密度水の給水と高密度
水の循環とを適宜切替えて低密度層または高密度層の流
れの方向を反転させる手段を備えた構成を特徴とする。
In the two-layer flow test apparatus according to the present invention, partition plates are provided at the upstream end and the downstream end of the water channel, respectively, and partition plates for partitioning the water channel into upper and lower stages are provided at the upstream end of the upper stage. A first pipe for supplying low-density water evenly in the width direction of the water channel to generate a flow of a low-density layer, and a high-density water provided in the upstream end of the lower stage and uniform in the width direction of the water channel. Of the first pipe, a second pipe that circulates to generate a high-density layer flow, a weir provided downstream of the first pipe to generate a vortex region in the low-density layer flow, A chamber provided on the downstream side for injecting and mixing high-density water into the flow of the low-density layer is provided, and the first and second pipes, the weir, and the chamber are also provided on the downstream side of the water channel. Cut off between low-density water and high-density water supply and high-density water circulation Ete characterized the structure having means for reversing the direction of flow of the low-density layer or high density layer.
【0007】[0007]
【作用】即ち、本発明に係る二層流試験装置において
は、水路内の上流端および下流端にそれぞれ仕切板が設
けられ水路内が上段および下段に仕切られた上段の上流
端に第一の管が設けられ水路内の幅方向に均等に低密度
水を給水して低密度層の流れを発生させ下段の上流端に
第二の管が設けられ水路内の幅方向に均等な高密度水の
循環を行って高密度層の流れを発生させ第一の管の下流
側に堰が設けられて低密度層の流れに渦域を発生させ第
一の管の下流側にチャンバーが設けられて低密度層の流
れに高密度水を噴き込み混合させるようになっており、
下段の高密度水と上段の低密度水とによりそれぞれ個々
に高低密度層の流れを同時に発生させて二層流にする。
そして、上段の第一の管の下流側に設けられた堰によっ
て堰の下流側が渦域になり、この渦域内に第一の管の下
流側に設けられたチャンバーから高密度水が噴き込まれ
ることによって渦域内で低密度水と高密度水との混合が
行われる。このように混合された後、密度の小さいもの
は上方へ密度の大きいものは下方へ、それぞれの密度に
応じて所定の深さへ次第に移動し水深方向に所定の密度
分布が形成されて安定した状態で下流へ流動する。この
ようにして実際の流れ状況に非常に近い形で流れや混合
などを伴う二層流を再現することができる。
That is, in the two-layer flow test apparatus according to the present invention, the partition plate is provided at each of the upstream end and the downstream end in the water channel, and the first end is provided at the upstream end of the upper step where the inside of the water channel is divided into the upper stage and the lower stage. A pipe is provided to supply low-density water evenly across the width of the waterway to generate a flow in the low-density layer, and a second pipe is provided at the upstream end of the lower stage to provide high-density water evenly across the width of the waterway. Circulation is carried out to generate a high-density layer flow, a weir is provided on the downstream side of the first pipe, a swirl region is generated on the low-density layer flow, and a chamber is provided on the downstream side of the first pipe. High-density water is injected and mixed into the flow of the low-density layer,
The high-density water in the lower stage and the low-density water in the upper stage simultaneously generate the flows of the high- and low-density layers individually to form a two-layer flow.
Then, the weir provided on the downstream side of the upper first pipe forms a swirl region on the downstream side of the weir, and high-density water is injected into the swirl region from the chamber provided on the downstream side of the first pipe. As a result, low density water and high density water are mixed in the swirl region. After being mixed in this way, those with a low density move upwards, those with a high density move downwards, and gradually move to a predetermined depth according to the respective densities, and a predetermined density distribution is formed in the water depth direction and stabilizes. It flows downstream in the state. In this way, it is possible to reproduce a two-layer flow involving flow and mixing in a form very close to the actual flow condition.
【0008】また、本発明に係る二層流試験装置におい
ては、水路内の上流端および下流端にそれぞれ仕切板が
設けられ水路内が上段および下段に仕切られた上段の上
流端に第一の管が設けられ水路内の幅方向に均等に低密
度水を給水して低密度層の流れを発生させ下段の上流端
に第二の管が設けられ水路内の幅方向に均等な高密度水
の循環を行って高密度層の流れを発生させ第一の管の下
流側に堰が設けられて低密度層の流れに渦域を発生させ
第一の管の下流側にチャンバーが設けられて低密度層の
流れに高密度水を噴き込み混合させるとともに第一およ
び第二の管と堰とチャンバーとを水路の下流側にも設け
低密度水および高密度水の給水と高密度水の循環とを適
宜切替えて低密度層または高密度層の流れの方向を反転
させるようになっており、下段の高密度水と上段の低密
度水とによりそれぞれ個々に高低密度層の流れを同時に
発生させて二層流にする。そして、上段の第一の管の下
流側に設けられた堰によって堰の下流側が渦域になり、
この渦域内に第一の管の下流側に設けられたチャンバー
から高密度水が噴き込まれることによって渦域内で低密
度水と高密度水との混合が行われる。このように混合さ
れた後、密度の小さいものは上方へ密度の大きいものは
下方へ、それぞれの密度に応じて所定の深さへ次第に移
動し水深方向に所定の密度分布が形成されて安定した状
態で下流へ流動する。さらに、堰とチャンバーとを水路
の下流側にも設けて上段および下段の層流を同時に、或
いは個々に流れの方向を任意に変えることにより実際の
流れの状況に非常に近い形で流れや混合などを伴う二層
流を再現することができる。
Further, in the two-layer flow test apparatus according to the present invention, partition plates are provided at the upstream end and the downstream end of the water channel, respectively, and the first end is provided at the upstream end of the upper channel which is divided into the upper channel and the lower channel. A pipe is provided to supply low-density water evenly across the width of the waterway to generate a flow in the low-density layer, and a second pipe is provided at the upstream end of the lower stage to provide high-density water evenly across the width of the waterway. Circulation is carried out to generate a high-density layer flow, a weir is provided on the downstream side of the first pipe, a swirl region is generated on the low-density layer flow, and a chamber is provided on the downstream side of the first pipe. High-density water is injected into the flow of the low-density layer to mix it, and first and second pipes, weirs and chambers are also provided downstream of the channel to supply low-density water and high-density water and circulate high-density water. To switch the flow direction of the low-density layer or high-density layer by switching Cage, each simultaneously generates a flow of high and low density layer respectively by the dense water and the upper low-density water lower to bilayer stream. Then, the weir provided on the downstream side of the upper first pipe forms a swirl area on the downstream side of the weir,
High-density water is injected into the vortex region from a chamber provided on the downstream side of the first pipe, whereby low-density water and high-density water are mixed in the vortex region. After being mixed in this way, those with a low density move upwards, those with a high density move downwards, and gradually move to a predetermined depth according to the respective densities, and a predetermined density distribution is formed in the water depth direction and stabilizes. It flows downstream in the state. In addition, weirs and chambers are also provided on the downstream side of the water channel to make the laminar flow in the upper and lower stages at the same time, or by individually changing the direction of the flow, the flow and mixing in a form very close to the actual flow situation. It is possible to reproduce a two-layer flow with such as.
【0009】[0009]
【実施例】図1および図2は本発明の一実施例に係る二
層流試験装置の説明図である。図において、本実施例に
係る二層流試験装置は淡水と海水とが合流する河口付近
における流れの調査実験などに使用されるもので、図1
に示すように水路(水槽)1の両端にはそれぞれ水路1
内を上下に分離する仕切板2が設けられており、この仕
切板2の下段側には高密度層が、また上段側には低密度
層がそれぞれ水の密度差により成層して二層流が発生す
るようになっている。また、水路の両端には水路1の幅
方向に均一の流れが発生するように多孔管8,17が設
置されている。高密度層側は水路1両端の多孔管8を配
管18により循環ポンプ9に連結しており、循環ポンプ
9の働きによってポンプ吐出側が水路の上流、吸込側が
下流となる。低密度層へは低密度水タンク3から給水さ
れ、吸込みは排出ポンプ10で行うようになっており、
吐出側に堰5を設け、その堰5すぐ下流側にチャンバー
6を設けてチャンバー6に設けられている小穴(ノズ
ル)7から高密度水タンク4から供給される高密度水が
噴出するようになっている。
1 and 2 are explanatory views of a two-layer flow test apparatus according to one embodiment of the present invention. In the figure, the two-layer flow test apparatus according to the present embodiment is used for an experiment for investigating a flow in the vicinity of an estuary where freshwater and seawater join together.
At both ends of the waterway (water tank) 1, as shown in
A partition plate 2 for separating the inside into an upper part and a lower part is provided, and a high-density layer is formed on the lower side of the partition plate 2 and a low-density layer is formed on the upper side of the partition plate 2 due to the difference in water densities. Is to occur. Further, perforated pipes 8 and 17 are installed at both ends of the water channel so that a uniform flow is generated in the width direction of the water channel 1. On the high-density layer side, the perforated pipes 8 at both ends of the water channel 1 are connected to a circulation pump 9 by a pipe 18, and by the function of the circulation pump 9, the pump discharge side is the upstream side of the water channel and the suction side is the downstream side. Water is supplied to the low-density layer from the low-density water tank 3, and suction is performed by the discharge pump 10.
A weir 5 is provided on the discharge side, a chamber 6 is provided immediately downstream of the weir 5, and high-density water supplied from a high-density water tank 4 is jetted from a small hole (nozzle) 7 provided in the chamber 6. Has become.
【0010】即ち、本装置は水路の両端側に堰5および
チャンバー6を置いてミキシングゾーンを形成し、水路
1両端のどちら側からでも密度による成層の流れを発生
させることができるようになっている。堰5とチャンバ
ー6とは一体に形成されており、小形化が図られてい
る。下段の高密度層側には両端に多孔管8が設けられ配
管18により互いに連結されている。配管18の途中に
は循環ポンプ9、四方切替弁16が設けられており、四
方切替弁16の弁体を回転させることによって多孔管8
に設けられている循環ポンプ9の吐出管と吸込管との管
路が互いに逆転すると同時に両多孔管8の作用も逆転
し、水路内の流れが反転するようになっている。また、
上段の低密度層側も同様に四方切替弁19により何れか
一方が低密度タンク3と連結されて供給側になり、他方
は排出ポンプ10に連結されて吸込側となる。このよう
に四方切替弁19の弁体を回転させることにより供給側
と吸込側とが同時に切り替わって低密度層の流れを反転
させるようになっている。また、チャンバー6に対する
高密度水の供給も四方切替弁20によってどちらか一方
のチャンバー6への切替えが可能になっており、水路1
内の流れの方向が反転しても高密度水の流れによって形
成される密度分布を維持することができるようになって
いる。このように低密度水タンク3、高密度水タンク4
に四方切替弁19,20を組合わせることにより成層の
まま周期的に、或いは非周期的に反転する流れを作り出
すことができる。なお、上段への高密度水の供給は、同
図(b)に示すようにチャンバー6の位置を変更した
り、同図(c)に示すようにチャンバーを設けずに下段
から高密度層の流れを利用して高密度水を上段へ導びく
ようにしてもよい。また、小穴7をスリット状に形成し
てもよい。
That is, the present apparatus has a weir 5 and a chamber 6 at both ends of the water channel to form a mixing zone, and can generate a stratified flow depending on the density from either side of the water channel 1. There is. The weir 5 and the chamber 6 are formed integrally with each other, and are downsized. Perforated tubes 8 are provided at both ends on the side of the lower high-density layer, and are connected to each other by a pipe 18. A circulation pump 9 and a four-way switching valve 16 are provided in the middle of the pipe 18, and the perforated pipe 8 is rotated by rotating the valve body of the four-way switching valve 16.
At the same time, the discharge pipe and the suction pipe of the circulation pump 9 provided in the above are reverse to each other, and at the same time, the actions of both porous pipes 8 are also reversed, so that the flow in the water passage is reversed. Also,
Similarly, on the low density layer side of the upper stage, either one is connected to the low density tank 3 by the four-way switching valve 19 to be the supply side, and the other is connected to the discharge pump 10 to be the suction side. In this way, by rotating the valve body of the four-way switching valve 19, the supply side and the suction side are switched at the same time to reverse the flow of the low density layer. Further, the supply of high-density water to the chamber 6 can be switched to either one of the chambers 6 by the four-way switching valve 20.
Even if the flow direction inside is reversed, the density distribution formed by the high-density water flow can be maintained. In this way, low density water tank 3 and high density water tank 4
By combining the four-way switching valves 19 and 20 with each other, it is possible to create a flow that is periodically or aperiodically reversed in the stratified state. The high-density water is supplied to the upper stage by changing the position of the chamber 6 as shown in the same figure (b) or by forming the high density layer from the lower stage without providing the chamber as shown in the same figure (c). The flow may be used to guide the high density water to the upper stage. Further, the small hole 7 may be formed in a slit shape.
【0011】本装置は下段に高密度水を、上段に低密度
水をそれぞれ給水して個々に流れを発生させ、密度差に
より高密度層と低密度層とを成層するようになってお
り、これらの成層を同時に発生させることにより二層流
が形成される。即ち、図2に示すように下段の高密度層
は循環ポンプ9を運転して吸込側の多孔管8から吸引
し、吐出側の多孔管8から吐出することによって水路1
内の下段に高密度層の流れを生じる。また、上段におい
ては低密度水タンク3から給水して上段の多孔管17か
ら低密度水を吐出するとともに、堰5で流路が狭められ
ていることにより低密度水が速度を速めて下流へ流れる
が、この堰5の上を通過する速度によって堰5の直ぐ下
流側の水が吸引されて混合し下流へ運ばれる。この吸引
される水の動きと運び去られた水を補う水の動きとによ
って堰5の下流側が渦域になり、この渦域の中にチャン
バー6の小穴7から高密度水が噴き込まれることによっ
てさらに渦域が発達してミキシングゾーンが形成され、
このミキシングゾーン内で低密度水と高密度水との混合
が進む。
In this apparatus, high-density water is supplied to the lower stage and low-density water is supplied to the upper stage to individually generate flows, and a high-density layer and a low-density layer are formed by the difference in density, A two-layer flow is formed by generating these stratifications simultaneously. That is, as shown in FIG. 2, in the lower high-density layer, the circulation pump 9 is operated to draw in the porous pipe 8 on the suction side and discharge it from the porous pipe 8 on the discharge side.
A high-density layer flow occurs in the lower part of the inside. In addition, in the upper stage, water is supplied from the low density water tank 3 and the low density water is discharged from the perforated pipe 17 in the upper stage, and the flow path is narrowed by the weir 5, so that the low density water accelerates to the downstream side. Although flowing, the water immediately downstream of the weir 5 is sucked by the speed of passing over the weir 5, is mixed, and is carried downstream. Due to the movement of the sucked water and the movement of the water that supplements the carried water, the downstream side of the weir 5 becomes a swirl region, and high-density water is injected from the small holes 7 of the chamber 6 into this swirl region. The vortex region further develops to form a mixing zone,
Mixing of the low-density water and the high-density water proceeds in this mixing zone.
【0012】このミキシングゾーンにおける低密度水と
高密度水との混合過程において、高密度水と多く接触し
た低密度水もあれば接触の少なかった低密度水もある。
このため、流れは水の密度が大小様々の状態となってミ
キシングゾーンから出るが、このとき密度の小さい水は
上方へ密度の大きい水は下方へ、それぞれの密度に応じ
て所定の深さへ次第に移動する。これによって上段の低
密度層は水深方向に所定の密度分布が形成され、安定し
た状態で下流へ流れる。同図(b)に示すように、上段
における多孔管17からの供給水量をθ2 、チャンバー
6からの供給水量をθ3 とすると、密度分布の形態は相
互の供給水量θ2 、θ3 の割合と水深の深さとで決ま
り、流れの速さは供給水量(θ2 +θ3 )の大小で決ま
る。同図(c)、(d)、(e)はそれぞれ密度分布の
形態を示しており、同図(c)は供給水量θ2 と供給水
量θ3 とが適量の場合、同図(d)は供給水量θ2 が多
い場合、同図(e)は堰5の高さを低くしてミキシング
ゾーンの働きを抑え、低密度層と高密度層との境の部分
を狭くして急勾配の密度分布を形成した場合である。
In the mixing process of the low density water and the high density water in the mixing zone, some of the low density water is in contact with the high density water and the other is of low density.
For this reason, the flow exits the mixing zone in various states of varying water density. At this time, low-density water moves upward, high-density water moves downward, and to a predetermined depth depending on the density. Move gradually. As a result, a predetermined density distribution is formed in the upper low-density layer in the depth direction, and it flows downstream in a stable state. As shown in (b) of the figure, when the amount of water supplied from the perforated pipe 17 in the upper stage is θ 2 and the amount of water supplied from the chamber 6 is θ 3 , the form of the density distribution is that of the mutual amounts of water supplied θ 2 and θ 3 . It is determined by the ratio and the depth of water, and the flow speed is determined by the amount of supplied water (θ 2 + θ 3 ). The figures (c), (d), and (e) respectively show the form of the density distribution, and the figure (c) shows the figure (d) when the supply water amount θ 2 and the supply water amount θ 3 are proper amounts. When the amount of supplied water θ 2 is large, in the figure (e), the height of the weir 5 is lowered to suppress the action of the mixing zone, and the boundary between the low density layer and the high density layer is narrowed to make a steep slope. This is the case where a density distribution is formed.
【0013】従来は成層からの取水や放水など流れの調
査実験では影響力の主体を水の密度差と考え、流れを与
えずに成層のみを再現する従来の二層流試験装置により
取水や放水などの挙動を捕らえ、想定される流れの影響
については別途に加味する方法が採られている。また、
取水や放水などの密度から流れの主体が成層内の上層ま
たは下層の何れかであることが推定できるような場合に
は、その層における水の密度を抽出してこれを単一密度
水の流れとして再現し、その単一密度水の流れにおける
取水や放水などの挙動を調査実験する。そして、後から
成層状態における影響などを考察する方法が採られてい
る。しかしながら、近年は地球的規模で環境保全に係わ
る関心が高まって行政による指導が強化され、水質改善
や影響予測などについても一段と規制や要請などが厳し
くなっている。従って、排水の拡散や挙動などの予測調
査においても、上記のような従来の二層流試験装置によ
り流れを省略して密度による成層のみを再現する調査実
験や、単層流として流れを捕える調査実験などでは精度
的にこれからの規制や要請などに応じ切れなくなって来
ているが、本装置においては上述のようにこれら規制や
要請などにも対応し得るように高低密度により二層を維
持しながら流動するように仕切板2を境界に上下に二層
を形成させ、上段の低密度層において任意の密度分布を
形成することができるとともに、四方切替弁16,1
9,20との組み合わせにより上下の二層を同時に、或
いは個々に一方向または往復の流れを任意に与えること
ができ、従って密度分布と反転流れとの二つの主要な現
象を実際の状況に極く近い形で再現することができる特
長を有しており、例えば淡水と海水とが合流する河口付
近における水の密度による複雑な成層の流れの調査実験
などにも最適で、河口付近における取水や放水などに伴
う環境保全を予測調査する調査実験の精度を大幅に高め
ることができる。また、水以外の液体による二層流およ
び密度分布などの再現にも適用することができる。
Conventionally, in a flow investigation experiment such as water intake and water discharge from stratification, the main influence is considered to be the water density difference, and water intake and water discharge are performed by a conventional two-layer flow test device that reproduces only stratification without giving flow. A method is adopted in which behaviors such as the above are captured, and the expected effects of the flow are added separately. Also,
If it can be estimated from the density of water intake or discharge that the main body of the flow is either the upper layer or the lower layer in the stratification, the density of the water in that layer is extracted and this is used as the single density water flow. The behavior of water intake and water discharge in the single density water flow is investigated and tested. Then, a method of later considering the influence in the stratified state is adopted. However, in recent years, the concern about environmental conservation has been increasing on a global scale, and the guidance by the government has been strengthened, and regulations and requests for water quality improvement and impact prediction have become more severe. Therefore, even in predictive investigations of diffusion and behavior of wastewater, investigation experiments that omit the flow and reproduce only stratification by density using the above-mentioned conventional two-layer flow test equipment, or investigations that capture the flow as a single-layer flow In experiments, etc., it has become difficult to accurately meet future regulations and requests, but in this device, two layers are maintained by high and low densities so as to meet these regulations and requests as described above. While forming two layers above and below with the partition plate 2 as a boundary so as to flow while being able to form an arbitrary density distribution in the upper low-density layer, the four-way switching valves 16, 1
By combining with 9 and 20, the upper and lower two layers can be given one-way or reciprocating flow at the same time or individually, so that two main phenomena, density distribution and reversal flow, can be applied to the actual situation. It has a feature that it can be reproduced in a close shape, and is ideal for, for example, an experiment to investigate a complicated stratified flow due to the density of water near the estuary where freshwater and seawater join, and it It is possible to greatly improve the accuracy of the research experiment for predicting and investigating the environmental protection associated with water discharge. It can also be applied to the reproduction of a two-layer flow and density distribution with a liquid other than water.
【0014】[0014]
【発明の効果】本発明に係る二層流試験装置は前記のよ
うに構成されており、実際の流れの状況に非常に近い形
で流れや混合などを伴う二層流を再現することができる
ので、例えば淡水と海水とが合流する河口付近における
複雑な密度による成層の挙動についての調査実験などに
も最適で取水や放水などに伴う環境保全に関する予測調
査の精度を大幅に高めることができる。
The double laminar flow test apparatus according to the present invention is configured as described above, and can reproduce a double laminar flow involving flow and mixing in a form very close to the actual flow condition. Therefore, for example, it is also suitable for a research experiment on the behavior of stratification due to a complicated density in the vicinity of the estuary where freshwater and seawater join, and the accuracy of the predictive research on environmental conservation associated with water intake and discharge can be greatly increased.
【図面の簡単な説明】[Brief description of drawings]
【図1】図1(a)は本発明の一実施例に係る二層流試
験装置の断面図、同図(b),(c)はその応用例に係
る二層流試験装置の断面図である。
FIG. 1 (a) is a cross-sectional view of a two-layer flow test apparatus according to an embodiment of the present invention, and FIGS. 1 (b) and (c) are cross-sectional views of a two-layer flow test apparatus according to an application example thereof. Is.
【図2】図2はこれらの作用説明図である。FIG. 2 is an explanatory diagram of these functions.
【図3】図3は従来の二層流試験装置の断面図である。FIG. 3 is a cross-sectional view of a conventional two-layer flow test device.
【符号の説明】[Explanation of symbols]
1 水路(水槽) 2 仕切板 3 低密度水タンク 4 高密度水タンク 5 堰 6 チャンバー 7 小穴(ノズル) 8 多孔管 9 循環ポンプ 10 排出ポンプ 16 四方切替弁 17 多孔管 18 配管 19 四方切替弁 20 四方切替弁 1 Water channel (water tank) 2 Partition plate 3 Low-density water tank 4 High-density water tank 5 Weir 6 Chamber 7 Small hole (nozzle) 8 Perforated pipe 9 Circulation pump 10 Discharge pump 16 Four-way switching valve 17 Perforated pipe 18 Piping 19 Four-way switching valve 20 4-way switching valve

Claims (2)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 水路内の上流端および下流端にそれぞれ
    設けられ上記水路内を上段および下段に仕切る仕切板
    と、上記上段の上流端に設けられ上記水路内の幅方向に
    均等に低密度水を給水して低密度層の流れを発生させる
    第一の管と、上記下段の上流端に設けられ上記水路内の
    幅方向に均等な高密度水の循環を行って高密度層の流れ
    を発生させる第二の管と、上記第一の管の下流側に設け
    られ低密度層の流れに渦域を発生させる堰と、上記第一
    の管の下流側に設けられ低密度層の流れに高密度水を噴
    き込んで混合させるチャンバーとを備えたことを特徴と
    する二層流試験装置。
    1. A partition plate provided at each of an upstream end and a downstream end in a water channel to partition the water channel into an upper stage and a lower stage, and a low density water uniformly provided in the width direction in the water channel provided at an upstream end of the upper stage. The first pipe that supplies water to generate the flow of the low-density layer and the high-density layer that is provided at the upstream end of the lower stage and that circulates the high-density water evenly in the width direction of the water channel to generate the flow of the high-density layer. A second pipe that is allowed to flow, a weir that is provided on the downstream side of the first pipe to generate a vortex region in the flow of the low-density layer, and a weir that is provided on the downstream side of the first pipe and has a high flow rate of the low-density layer. A two-layer flow test device, comprising: a chamber for spraying and mixing density water.
  2. 【請求項2】 上記第一および第二の管と上記堰と上記
    チャンバーとを上記水路の下流側にも設け低密度水およ
    び高密度水の給水と高密度水の循環とを適宜切替えて低
    密度層または高密度層の流れの方向を反転させる手段を
    備えたことを特徴とする請求項1に記載の二層流試験装
    置。
    2. The first and second pipes, the weir, and the chamber are also provided on the downstream side of the water channel to appropriately switch between low-density water and high-density water supply and high-density water circulation. The two-layer flow test apparatus according to claim 1, further comprising means for reversing the flow direction of the dense layer or the flow of the dense layer.
JP6232996A 1994-09-28 1994-09-28 Two-layer flow test equipment Expired - Lifetime JP3025160B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6232996A JP3025160B2 (en) 1994-09-28 1994-09-28 Two-layer flow test equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6232996A JP3025160B2 (en) 1994-09-28 1994-09-28 Two-layer flow test equipment

Publications (2)

Publication Number Publication Date
JPH0894488A true JPH0894488A (en) 1996-04-12
JP3025160B2 JP3025160B2 (en) 2000-03-27

Family

ID=16948173

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6232996A Expired - Lifetime JP3025160B2 (en) 1994-09-28 1994-09-28 Two-layer flow test equipment

Country Status (1)

Country Link
JP (1) JP3025160B2 (en)

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Publication number Priority date Publication date Assignee Title
CN102680206A (en) * 2012-06-18 2012-09-19 上海理工大学 Flow boiling heat transfer mechanism experimental facility and method
CN103868671A (en) * 2014-04-09 2014-06-18 中国船舶重工集团公司第七○二研究所 Method for preparing fluid with layered density
CN104865045A (en) * 2015-06-16 2015-08-26 国家海洋技术中心 Closed-loop control tide flow simulation test device
CN105865745A (en) * 2016-03-28 2016-08-17 四川大学 Stratified flow simulation test water channel system
CN107132023A (en) * 2017-04-29 2017-09-05 西南交通大学 Flat slope flume test system
CN107545826A (en) * 2017-10-15 2018-01-05 安徽理工大学 Short flume experiment device
CN110146252A (en) * 2019-04-19 2019-08-20 浙江大学 A kind of density current experimental provision and method considering environment liquid mechanism of action

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102680206A (en) * 2012-06-18 2012-09-19 上海理工大学 Flow boiling heat transfer mechanism experimental facility and method
CN103868671A (en) * 2014-04-09 2014-06-18 中国船舶重工集团公司第七○二研究所 Method for preparing fluid with layered density
CN103868671B (en) * 2014-04-09 2016-02-17 中国船舶重工集团公司第七○二研究所 A kind of preparation method of density stratified fluid
CN104865045A (en) * 2015-06-16 2015-08-26 国家海洋技术中心 Closed-loop control tide flow simulation test device
CN105865745A (en) * 2016-03-28 2016-08-17 四川大学 Stratified flow simulation test water channel system
CN105865745B (en) * 2016-03-28 2018-04-24 四川大学 A kind of stratified flow simulation test tank system
CN107132023A (en) * 2017-04-29 2017-09-05 西南交通大学 Flat slope flume test system
CN107545826A (en) * 2017-10-15 2018-01-05 安徽理工大学 Short flume experiment device
CN110146252A (en) * 2019-04-19 2019-08-20 浙江大学 A kind of density current experimental provision and method considering environment liquid mechanism of action
CN110146252B (en) * 2019-04-19 2020-10-13 浙江大学 Density flow experimental device and method considering environmental fluid action mechanism

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