CN113218617A - Multi-cylinder streaming experimental device - Google Patents
Multi-cylinder streaming experimental device Download PDFInfo
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- CN113218617A CN113218617A CN202110271720.1A CN202110271720A CN113218617A CN 113218617 A CN113218617 A CN 113218617A CN 202110271720 A CN202110271720 A CN 202110271720A CN 113218617 A CN113218617 A CN 113218617A
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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
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Abstract
The invention discloses a multi-cylinder streaming experiment device, which comprises a cylinder, a rectangular assembly block A, a rectangular assembly block B, a force transducer and a disc, wherein the cylinder is provided with a rectangular assembly block A; the disc is fixed in the water tank, and a plurality of threaded holes for fixing the cylinder are formed in the disc; the rectangular assembling block A is fixedly arranged at the end part of the cylinder; the cylinder is fixed on the disc in two ways: 1. measuring the stress of the cylinder, wherein the rectangular assembly block B is used for connecting the force transducer and the cylinder, one end of the rectangular assembly block B is fixedly connected with the rectangular assembly block A, the other end of the rectangular assembly block B is fixedly connected with one end of the force transducer, and the other end of the force transducer is fixedly connected with the disc; 2. the cylinder is directly fixedly connected with the disc through the rectangular assembly block A without measuring the stress of the cylinder. The experimental device can realize the streaming experiment from a single column to a nine-column, and can change the angle between the incoming flow direction and the cylinder by arranging the specific threaded hole on the disc, so that the streaming experiment of the cylinder under different flow direction angles is researched.
Description
Technical Field
The invention relates to a multi-cylinder flow-around experimental device, belonging to the fields of hydromechanics and fluid engineering.
Background
The problem of cylindrical streaming in free incoming flow is a classical problem in fluid mechanics, wherein complex physical phenomena such as wake interference, vortex shedding and energy exchange are involved. Flow bypassing problems occur in the engineering field, such as bridges, chimneys, aircraft surface controls, engines, heat exchangers, tow cables, drilling, marine risers and other hydroacoustic, hydrodynamic practices and applications, and the like. In deep sea engineering construction, the most common structure is a cylinder, and the research on the streaming flow mechanism of the cylinder can provide theoretical support for a plurality of engineering application examples and has obvious social and economic benefits.
At present, the research method for cylinder circumfluence is mainly theoretical analysis, experimental research and prototype observation and numerical simulation. Because the cylindrical flow-around problem belongs to a complex nonlinear fluid mechanics problem, theoretical analysis is to make many assumptions, study the basic properties of the cylindrical flow-around on the basis of simplifying the model, and has certain limitations. Therefore, experimental research and prototype observation are still important research means. The method is applied to Asahi (research on flow field characteristics and vortex shedding rules of cylindrical streaming), and a physical model of single cylindrical streaming is researched by utilizing a Particle Image Velocimetry (PIV), so that a more refined structure of a vortex in a flow field is measured, and a change mechanism of a vortex body is disclosed to a certain extent. The double-column streaming arrangement mode comprises an arrangement mode of tandem arrangement, parallel arrangement, staggered arrangement and the like, the diameter of a double column can be divided into equal diameter and unequal diameter, the situation of multi-column streaming is more complex, the factors such as the number of columns, Reynolds number and relative positions among columns can interfere with the cylindrical wake flow, so that a vortex shedding structure and a wake flow field structure are more complex and diversified, the mechanism of coupling interference is more difficult to explain, and most of the existing multi-column streaming research is focused on double-column streaming research. As described above, in the experiment of performing the cylindrical bypass, a large number of experimental studies of single cylinder and double cylinder have been conducted, but there are fewer experimental studies and experimental apparatuses for more columns. The multi-column flow-around experiment device provided by the invention can change the angle between the incoming flow direction and the cylinder, realizes the flow-around experiment from a single column to nine columns, and is simple and efficient.
Disclosure of Invention
Aiming at the problems related to the existing multi-column experimental research and few experimental devices, the invention designs a multi-column circumfluence experimental device. This experimental apparatus not only can realize that the single-column is to the experimental of streaming of nine posts, can change the angle between incoming flow direction and the cylinder moreover, measures the cylinder atress condition.
The technical scheme adopted by the invention for realizing the technical requirements is as follows:
a multi-cylinder streaming experiment device comprises a cylinder, a rectangular assembly block A, a rectangular assembly block B, a force sensor and a disc, wherein the disc is provided with a plurality of threaded holes for fixing the cylinder; the rectangular assembling block A is fixedly arranged at the end part of the cylinder; the threaded holes comprise two types, one type is a threaded hole for measuring the stress of the cylinder, and the other type is a threaded hole for not measuring the stress of the cylinder;
to the screw hole of measuring cylinder atress, the mode that sets up of cylinder on the disc does: the rectangular assembly block B is used for connecting the force transducer and the cylinder, one end of the rectangular assembly block B is fixedly connected with the rectangular assembly block A, the other end of the rectangular assembly block B is fixedly connected with one end of the force transducer, and the other end of the force transducer is fixedly connected with the disc;
to the screw hole of not measuring cylinder atress, the mode that sets up of cylinder on the disc does: the cylinder is directly fixedly connected with the disc through the rectangular assembly block A.
Among the above-mentioned technical scheme, furtherly, the disc on still be equipped with a plurality of and shelf complex screw holes, the disc be fixed in the basin through the shelf, adjust the angle between incoming flow direction and the cylinder through rotating the disc.
Furthermore, the threaded holes matched with the shelf on the disc are uniformly arranged along the same circumference, a plurality of columns can integrally rotate along with the disc by rotating the disc, a circle of threaded holes in the columns can play a reference role on a rotation angle, and the deflection angle can be calculated by calculating the number of the rotating threaded holes.
Furthermore, the threaded holes for fixing the cylinders on the disc are located in the center of the disc, the number of the threaded holes is 9, and the streaming experiment of nine cylinders can be realized at most.
The invention has the beneficial effects that:
the invention can effectively solve the problems that the multi-column streaming experimental device is deficient in the current research, the structural style is not flexible enough, and the angle between the incoming flow direction and a plurality of cylinders cannot be changed. According to the invention, through designing the open pores of the multi-column streaming experimental device, the angle between the incoming flow direction and the plurality of cylinders can be changed, and the economic benefit is remarkable. And the structure form is flexible and changeable, the single-column to nine-column streaming experiment research can be realized, and the method has guiding significance for the research of marine riser pile groups and the like in real engineering.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings
FIG. 1 is a schematic view of a cylinder of the present invention.
Fig. 2 is a schematic view of a rectangular mounting block B of the present invention.
Figure 3 is a schematic view of a load cell of the present invention.
Fig. 4 is a schematic view of a disk of the present invention.
Fig. 5 is a schematic view of the entire apparatus.
Fig. 6 is a schematic diagram of calculating the angle of deflection from the threaded hole, 6(a) and 6(b) being before and after rotation of the disc, respectively.
The device comprises a cylinder 1, a rectangular assembly block A2, a rectangular assembly block B3, a force transducer 4 and a disc 5.
Detailed Description
The technical solution of the present invention is further explained below.
The multi-cylinder circumfluence experimental device can be divided into two conditions of measuring the stress of the cylinder and not measuring the stress of the cylinder, and the following description is separately provided.
As shown in fig. 1-5, the multi-column bypass flow experimental device of the present invention comprises a cylinder 1, a rectangular assembly block a2, a rectangular assembly block B3, a load cell 4, and a disc 5, wherein the disc 5 is provided with a plurality of threaded holes for fixing the cylinder 1; the rectangular assembling block A2 is fixedly arranged at the end part of the cylinder 1; the threaded holes comprise two types, one type is a threaded hole for measuring the stress of the cylinder 1, and the other type is a threaded hole for not measuring the stress of the cylinder 1;
for the threaded hole for measuring the stress of the cylinder 1, the cylinder 1 is arranged on the disc 5 in the following way: the rectangular assembly block B3 is used for connecting the force sensor 4 with the cylinder 1, one end of the rectangular assembly block B3 is fixedly connected with the rectangular assembly block A2, the other end of the rectangular assembly block B3 is fixedly connected with one end of the force sensor 4, and the other end of the force sensor 4 is fixedly connected with the disc 5;
for the threaded hole which does not measure the stress of the cylinder 1, the cylinder 1 is arranged on the disc 5 in the following way: the cylinder 1 is fixedly connected to the disc 5 directly by means of a rectangular mounting block a 2.
The disc 5 is also provided with a plurality of threaded holes matched with the rack, the disc 5 is fixed in the water tank through the rack, and the angle between the incoming flow direction and the cylinder 1 is adjusted by rotating the disc 5. Disc 5 on with shelf complex screw hole along same circumference evenly set up (all screw holes are located same circle), can make many posts together do the wholeness rotation along with the disc through rotatory disc, round screw hole on the cylinder can play the reference effect to rotation angle, can calculate the angle of deflection through calculating rotatory screw hole number. As shown in fig. 6, in the specific operation process, each threaded hole can be labeled, and if a threaded hole is rotated (the threaded hole 7 is rotated to the position of the original threaded hole 6), because the threaded holes are 8 in the figure, the threaded holes are equally divided into a circle, and the angle between the two threaded holes is 45 degrees, namely 45 degrees. Of course, the disc 5 may be uniformly provided with a plurality of threaded holes to achieve its desired rotation angle. The threaded holes for fixing the cylinders 1 on the disc 5 are located in the center of the disc 5, the number of the threaded holes is 9, and the flow-around experiment of nine cylinders can be realized at most.
In this embodiment, the threaded hole for measuring the stress of the cylinder 1 is circular, and the threaded hole for not measuring the stress of the cylinder 1 is quincunx.
Measuring the stress of the cylinder: the cylinder 1 and the load cell 4 are fitted by a rectangular fitting block B3, and a rectangular fitting block a2 and a rectangular fitting block B3 at the end of the cylinder 1 are connected by bolts. One end of the load cell 4 is connected with the rectangular assembly block B3 through a bolt, and the other end of the load cell 4 is connected with a common threaded hole on the disc 5 through a bolt (the quincunx threaded hole is used for not measuring the stress condition of the cylinder). In fig. 5, a plurality of threaded holes of the disc 5 can be matched with a rack in the sink, and the angle between the incoming flow direction and the cylinder is changed by rotating, so that the sink is different from one another, the device is flexible, and the rack form can be designed in various ways, so that the invention does not provide schematic diagrams of the sink and the rack.
The cylinder stress is not measured: the threaded holes in the rectangular assembly blocks A2 in the cylinder 1 are matched with the threaded holes in the disc 5, and the rectangular assembly blocks A2 are directly connected with the quincunx threaded holes in the disc 5 through bolts.
Claims (4)
1. A multi-cylinder streaming experimental device is characterized by comprising a cylinder, a rectangular assembly block A, a rectangular assembly block B, a force measuring sensor and a disc; the disc is fixed in the water tank, and a plurality of threaded holes for fixing the cylinder are formed in the disc; the rectangular assembling block A is fixedly arranged at the end part of the cylinder; the threaded holes comprise two types, one type is a threaded hole for measuring the stress of the cylinder, and the other type is a threaded hole for not measuring the stress of the cylinder;
to the screw hole of measuring cylinder atress, the mode that sets up of cylinder on the disc does: the rectangular assembly block B is used for connecting the force transducer and the cylinder, one end of the rectangular assembly block B is fixedly connected with the rectangular assembly block A, the other end of the rectangular assembly block B is fixedly connected with one end of the force transducer, and the other end of the force transducer is fixedly connected with the disc;
to the screw hole of not measuring cylinder atress, the mode that sets up of cylinder on the disc does: the cylinder is directly fixedly connected with the disc through the rectangular assembly block A.
2. The multi-cylinder circumfluence experimental apparatus as claimed in claim 1, wherein the disc is further provided with a plurality of threaded holes engaged with the rack, the disc is fixed in the water tank through the rack, and the angle between the incoming flow direction and the cylinder is adjusted by rotating the disc.
3. The multi-cylinder flow-around experiment device according to claim 2, wherein the threaded holes on the disk, which are engaged with the rack, are uniformly arranged along the same circumference, the multi-cylinder rotates integrally with the disk by rotating the disk, a circle of threaded holes on the cylinder is used as a reference for the rotation angle, and the deflection angle is calculated by calculating the number of the rotated threaded holes.
4. The multi-cylinder bypass flow experimental device according to claim 1, wherein the threaded holes for fixing the cylinders on the disk are located in the center of the disk, and the number of the threaded holes is 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110271720.1A CN113218617A (en) | 2021-03-12 | 2021-03-12 | Multi-cylinder streaming experimental device |
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| CN202110271720.1A CN113218617A (en) | 2021-03-12 | 2021-03-12 | Multi-cylinder streaming experimental device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59132340A (en) * | 1983-01-19 | 1984-07-30 | Nippon Furnace Kogyo Kaisha Ltd | Device for making density viewable in water stream model |
| CN103954429A (en) * | 2014-04-02 | 2014-07-30 | 西北工业大学 | Lotus leaf stem imitative cylinder around flow drag reduction test model |
| CN105203297A (en) * | 2015-09-18 | 2015-12-30 | 天津大学 | Vortex-induced vibration testing device capable of changing spatial arrangement of ocean vertical pipe bundles |
| CN107621351A (en) * | 2017-08-28 | 2018-01-23 | 江苏大学 | A kind of flow around bluff bodies experimental provision |
| CN107843407A (en) * | 2017-12-05 | 2018-03-27 | 西南交通大学 | A kind of clump of piles apparatus for adjusting position for structure hydrodynamic experiment |
| CN108507758A (en) * | 2018-05-04 | 2018-09-07 | 山东省科学院海洋仪器仪表研究所 | A kind of marine riser cylinder flow-disturbing experimental provision |
| CN211825372U (en) * | 2019-10-21 | 2020-10-30 | 西南石油大学 | Mechanical property experiment device for ocean test pipe column |
-
2021
- 2021-03-12 CN CN202110271720.1A patent/CN113218617A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59132340A (en) * | 1983-01-19 | 1984-07-30 | Nippon Furnace Kogyo Kaisha Ltd | Device for making density viewable in water stream model |
| CN103954429A (en) * | 2014-04-02 | 2014-07-30 | 西北工业大学 | Lotus leaf stem imitative cylinder around flow drag reduction test model |
| CN105203297A (en) * | 2015-09-18 | 2015-12-30 | 天津大学 | Vortex-induced vibration testing device capable of changing spatial arrangement of ocean vertical pipe bundles |
| CN107621351A (en) * | 2017-08-28 | 2018-01-23 | 江苏大学 | A kind of flow around bluff bodies experimental provision |
| CN107843407A (en) * | 2017-12-05 | 2018-03-27 | 西南交通大学 | A kind of clump of piles apparatus for adjusting position for structure hydrodynamic experiment |
| CN108507758A (en) * | 2018-05-04 | 2018-09-07 | 山东省科学院海洋仪器仪表研究所 | A kind of marine riser cylinder flow-disturbing experimental provision |
| CN211825372U (en) * | 2019-10-21 | 2020-10-30 | 西南石油大学 | Mechanical property experiment device for ocean test pipe column |
Non-Patent Citations (1)
| Title |
|---|
| 李强: ""圆柱群绕流的实验及数值模拟研究"", 《中国优秀博硕士学位论文全文数据库(硕士)基础科学辑》 * |
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Application publication date: 20210806 |