CN110146254B - Valve internal flow field endoscopic measurement method - Google Patents
Valve internal flow field endoscopic measurement method Download PDFInfo
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- CN110146254B CN110146254B CN201910504583.4A CN201910504583A CN110146254B CN 110146254 B CN110146254 B CN 110146254B CN 201910504583 A CN201910504583 A CN 201910504583A CN 110146254 B CN110146254 B CN 110146254B
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- endoscope
- valve body
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- valve
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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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- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
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Abstract
The invention relates to an endoscopic measurement method for an internal flow field of a valve, which combines a Particle Image Velocimetry (PIV) technology and an endoscope to realize measurement of the internal flow field of the valve. The surface of the valve body is provided with the hole groove hermetically covered by the transparent glass, so that a laser sheet of the PIV system can be irradiated into the valve, and the illumination of the internal area of the valve is realized; an endoscope hole is formed in the downstream of the valve outlet to enable the endoscope to extend into the outlet pipeline, and the endoscope is connected with the PIV camera to achieve internal flow field measurement.
Description
Technical Field
The invention relates to the technical field of experimental measurement in hydrodynamics, in particular to a valve internal flow field endoscopic measurement method.
Background
A valve is a device for controlling the direction, pressure, and flow rate of a fluid in a fluid system, and is a device capable of controlling the flow rate of a medium (liquid, gas, or powder) in a pipe or equipment by flowing or stopping the medium.
The flow channel structure and different opening states of the valve can cause the change of the flow field in the valve and generate some complex vortex systems, and parameters such as flow, pressure and the like can change in the opening and closing processes of the valve, so that the phenomena such as vibration, impact, noise and the like can be caused, the control of the valve is influenced, and the failure, damage or noise increase of the valve can be caused. For these reasons, the flow field in the valve must be studied intensively as a reference for vibration damping and noise reduction and structural design of the valve. Because the internal structure of the valve is complex, the traditional PIV measurement technology cannot directly measure the internal flow of the valve, so that the current research on the internal flow characteristics of the valve mainly relies on a numerical simulation technology, the research on test measurement is relatively few, and the numerical result needs to be verified by a test measurement means urgently.
Disclosure of Invention
The applicant provides an endoscopic measurement method for the internal flow field of the valve aiming at the defects in the prior art, so that endoscopic measurement of the internal flow field of the valve can be conveniently realized, and the operation is simple and convenient.
The technical scheme adopted by the invention is as follows:
the valve internal flow field endoscopic measurement method comprises a valve body, wherein an outlet is arranged above one end of the valve body, an inclined plane is arranged on the valve body beside the outlet, a platform is arranged at the inclined plane, a transparent window is arranged on the top surface of the platform, an endoscopic hole is formed in the other end of the valve body, an endoscope is arranged in the endoscopic hole and is connected with a PIV (particle image velocimetry) camera;
the specific measurement method comprises the following steps:
the device comprises two parts:
the first part is laser irradiation:
the first step is as follows: selecting an irradiation position, and selecting a required test surface near the outlet of the valve body according to the measurement requirement and the specific structure of the valve body;
the second step is that: processing a hole groove, wherein a hole groove is processed on the surface of the valve body at the selected irradiation position;
the third step: manufacturing a platform, namely manufacturing a sealed platform according to the surface curve of the valve body;
the fourth step: mounting the platform manufactured in the third step on the valve body;
the fifth step: installing a transparent window on the top surface of the platform;
and a sixth step: laser irradiation, wherein a laser sheet is formed and generated by a PIV system, and the generated laser sheet is directly irradiated into the valve cavity through a transparent window;
the second part is camera framing:
the first step is as follows: selecting an endoscope, wherein the endoscope is a rod type industrial endoscope, and the focal length of the endoscope can be adjusted and the visual angle can be selected;
the second step is that: selecting a viewing position, and selecting the viewing position at the downstream of the valve outlet according to the focusing distance of the endoscope;
the third step: processing an inner peephole, and processing the inner peephole on the wall surface of the pipeline at the view finding position;
the fourth step: the endoscope is installed, the sealing of the peephole is sealed by a Glan head made of standard metal materials, the specification of the Glan head is M12(4-8), the endoscope extends into the pipeline through the peephole and is sealed and fixed by the Glan head, and the head of the endoscope is positioned in the central area of the pipeline;
the fifth step: the camera is used for framing, and a camera of the PIV system is connected with the endoscope through a standard adapter interface to realize framing of the camera.
The further technical scheme is as follows:
the width of the hole groove is larger than 2mm, and the length of the hole groove is about 1.5 times of the radius of the valve port.
The platform is made of the same material as the valve body.
The bottom of the platform is connected with the surface of the valve body in a welding mode, the upper surface of the platform is a plane, a square empty groove is formed in the middle of the platform, and the size of the square empty groove is larger than that of a hole groove machined in the second portion.
The transparent window is made of optical glass or organic glass.
The thickness of the transparent window is larger than 5mm, and the transparent window is connected with the upper surface of the platform in a bonding mode.
The peep hole is a threaded hole of M12.
The observation range from the endoscope to the laser sheet is in a fan-shaped structure.
The invention has the following beneficial effects:
the invention has compact and reasonable structure and convenient operation, and realizes the measurement of the flow field inside the valve by combining the Particle Image Velocimetry (PIV) technology and the endoscope. Great convenience is brought to the test.
According to the invention, the surface of the valve body is provided with the hole groove hermetically covered by the transparent glass, so that a laser sheet of the PIV system can be irradiated into the valve, and the illumination of the internal area of the valve is realized; an inner peephole is formed in the downstream of the valve outlet to enable the endoscope to extend into the outlet pipeline, and the endoscope is connected with the PIV camera to achieve internal flow field measurement.
The invention can be applied to the measurement of the structures and characteristics of internal flow fields of valves, pipelines, pumps and the like in water conservancy.
Drawings
Fig. 1 is a front view (full sectional view) of the present invention.
Fig. 2 is a top view of fig. 1.
Wherein: 1. an outlet; 2. a valve body; 3. a laser sheet; 4. a transparent window; 5. a platform; 6. an endoscope; 7. a hole groove; 8. an inner peephole.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 and fig. 2, the valve internal flow field endoscopic measurement method of the present embodiment includes a valve body 2, an outlet 1 is arranged above one end of the valve body 2, an inclined plane is arranged on the valve body 2 beside the outlet 1, a platform 5 is installed at the inclined plane, a transparent window 4 is installed on the top surface of the platform 5, an endoscopic hole 8 is opened at the other end of the valve body 2, an endoscope 6 is installed in the endoscopic hole 8, and the endoscope 6 is connected to a PIV camera;
the specific measurement method comprises the following steps:
the device comprises two parts:
the first part is laser irradiation: the purpose of this part is to introduce the laser chip 3 generated by the PIV system inside the valve cavity, enabling illumination of the area inside the cavity 2.
The first step is as follows: selecting an irradiation position, and selecting a required test surface near an outlet 1 of the valve body 2 according to measurement requirements and a specific structure of the valve body 2;
the second step is that: processing a hole groove, namely processing a hole groove 7 on the surface of the valve body 2 at the selected irradiation position;
the third step: manufacturing a platform 5, namely manufacturing a sealed platform 5 according to the surface curve of the valve body 2;
the fourth step: mounting the platform 5 manufactured in the third step on the valve body 2;
the fifth step: a transparent window 4 is arranged on the top surface of the platform 5;
and a sixth step: laser irradiation, wherein a laser sheet is formed and generated by a PIV system, and the generated laser sheet is directly irradiated into the cavity of the valve 2 through the transparent window 4;
the second part is camera framing: the purpose of this section is to image the valve cavity interior area with an endoscopic device.
The first step is as follows: selecting an endoscope 6, wherein the endoscope 6 is a rod type industrial endoscope, and the focal length of the industrial endoscope can be adjusted and the visual angle can be selected;
the second step is that: selecting a viewing position, and selecting the viewing position at the downstream of the valve outlet according to the focusing distance of the endoscope 6;
the third step: processing an inner peephole 8, and processing the inner peephole 8 on the wall surface of the pipeline at the view finding position;
the fourth step: the endoscope 6 is installed, the sealing of the peephole 8 is sealed by a Glan head made of standard metal materials, the specification is M12(4-8), the endoscope 6 extends into the pipeline through the peephole 8 and is sealed and fixed by the Glan head, and the head of the endoscope is positioned in the central area of the pipeline;
the fifth step: the camera is used for framing, and a camera of the PIV system is connected with the endoscope 6 through a standard adapter interface to realize framing of the camera.
The width of the hole groove 7 is larger than 2mm, and the length is about 1.5 times of the radius of the valve port.
The platform 5 is made of the same material as the valve body 2.
The bottom of the platform 5 is connected with the surface of the valve body 2 in a welding mode, the upper surface of the platform 5 is a plane, a square empty groove is formed in the middle of the platform 5, and the size of the square empty groove is larger than that of the hole groove 7 machined in the second part.
The transparent window 4 is made of optical glass or organic glass. In order to ensure light transmission.
The thickness of the transparent window 4 is larger than 5mm, and the transparent window is connected with the upper surface of the platform 5 in an adhesion mode.
The peephole 8 is a threaded hole of M12.
The observation range from the endoscope 6 to the laser sheet 3 is enclosed into a fan-shaped structure.
By combining the two parts, the measurement of the flow field inside the valve body 2 can be conveniently completed, and great convenience is brought to the test.
The invention can effectively avoid the limitation that the traditional PIV flow field measurement needs to specially manufacture the valve body with the full transparent structure, wherein the laser irradiation part avoids the problems of wall surface refraction and reflection caused by the direct irradiation mode of the valve body with the transparent structure, and the camera view finding part avoids the image deformation influence caused by the traditional external view finding.
The PIV of the invention is:
full name: the Particle Image Velocimetry (also called Particle Image Velocimetry) is a transient, multipoint and contactless laser fluid mechanics Velocimetry method developed in the end of seventies. The PIV technology is characterized by exceeding the limitation of single-point velocity measurement technologies (such as CTA and LDA), being capable of recording velocity distribution information on a large number of spatial points in the same transient state and providing abundant flow field spatial structure and flow characteristics.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (1)
1. An endoscopic measurement method for a valve internal flow field is characterized in that: the valve comprises a valve body (2), an outlet (1) is arranged above one end of the valve body (2), an inclined plane is arranged on the valve body (2) beside the outlet (1), a platform (5) is installed at the inclined plane, a transparent window (4) is installed on the top surface of the platform (5), an inner peephole (8) is formed in the other end of the valve body (2), an endoscope (6) is installed in the inner peephole (8), and the endoscope (6) is connected with a PIV camera;
the specific measurement method comprises the following steps:
the device comprises two parts:
the first part is laser irradiation:
the first step is as follows: selecting an irradiation position, and selecting a required test surface near an outlet (1) of the valve body (2) according to measurement requirements and a specific structure of the valve body (2);
the second step is that: a hole groove is processed, and a hole groove (7) is processed on the surface of the valve body (2) at the selected irradiation position;
the third step: manufacturing a platform (5), and manufacturing a sealed platform (5) according to the surface curve of the valve body (2);
the fourth step: mounting the platform (5) manufactured in the third step on the valve body (2);
the fifth step: a transparent window (4) is arranged on the top surface of the platform (5);
and a sixth step: laser irradiation, wherein a laser sheet is formed and generated by a PIV system, and the generated laser sheet is directly irradiated into the cavity of the valve body (2) through the transparent window (4);
the second part is camera framing:
the first step is as follows: selecting an endoscope (6), wherein the endoscope (6) is a rod type industrial endoscope, and the focal length of the industrial endoscope can be adjusted and the visual angle can be selected;
the second step is that: selecting a viewing position, and selecting the viewing position at the downstream of the valve outlet according to the focusing distance of the endoscope (6);
the third step: processing an inner peephole (8), and processing the inner peephole (8) on the wall surface of the pipeline at the view finding position;
the fourth step: the endoscope (6) is installed, the peephole (8) is sealed by a Glan head made of standard metal materials, the specification is M12(4-8), the endoscope (6) extends into the pipeline through the peephole (8) and is sealed and fixed through the Glan head, and the head of the endoscope is positioned in the central area of the pipeline;
the fifth step: the camera is used for framing, and a camera of the PIV system is connected with the endoscope (6) through a standard adapter interface to realize framing of the camera; the width of the hole groove (7) is more than 2mm, and the length of the hole groove is 1.5 times of the radius of the valve port; the platform (5) is made of the same material as the valve body (2); the bottom of the platform (5) is connected with the surface of the valve body (2) in a welding mode, the upper surface of the platform (5) is a plane, a square empty groove is formed in the middle of the platform (5), and the size of the square empty groove is larger than that of the hole groove (7) processed in the second step; the transparent window (4) is made of optical glass or organic glass; the thickness of the transparent window (4) is larger than 5mm, and the transparent window is connected with the upper surface of the platform (5) in a bonding mode; the peep hole (8) is a threaded hole of M12; the observation range from the endoscope (6) to the laser sheet (3) is in a fan-shaped structure.
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| CN201910504583.4A CN110146254B (en) | 2019-06-12 | 2019-06-12 | Valve internal flow field endoscopic measurement method |
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| CN201910504583.4A CN110146254B (en) | 2019-06-12 | 2019-06-12 | Valve internal flow field endoscopic measurement method |
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| CN110146254B true CN110146254B (en) | 2021-03-09 |
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| CN113325195B (en) * | 2021-07-06 | 2023-04-21 | 中国船舶工业集团公司第七0八研究所 | Endoscopic PIV test device for measuring axial flow velocity field of water pump |
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| JP2000111808A (en) * | 1998-10-02 | 2000-04-21 | Kubota Corp | In-tube inspection device |
| CN100443899C (en) * | 2005-08-19 | 2008-12-17 | 北京航空航天大学 | An interior flow field measurement method for turbomachine |
| CN102494869B (en) * | 2011-12-27 | 2013-11-27 | 东南大学 | Measuring device of dense two-phase flow particle speed and concentration spatial distribution |
| CN103115001A (en) * | 2013-01-29 | 2013-05-22 | 南京工业大学 | Measurement testing device of external characteristics and internal flow of fused salt model pump |
| CN104215426B (en) * | 2014-09-22 | 2017-03-08 | 中国船舶工业集团公司第七〇八研究所 | A kind of hydraulic propeller flow field and external characteristics measurement apparatus and its measuring method |
| CN104776990A (en) * | 2014-12-17 | 2015-07-15 | 吴忠仪表有限责任公司 | System for measuring flow field of special control valve for coal chemical industry |
| CN109738153B (en) * | 2019-01-08 | 2020-12-08 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Supercavitation internal flow testing device |
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