CN104807612A - Circulating water tunnel-based synchronous measuring system for unsteady cavitating flows - Google Patents
Circulating water tunnel-based synchronous measuring system for unsteady cavitating flows Download PDFInfo
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Abstract
The invention relates to a circulating water tunnel-based synchronous measuring system for unsteady cavitating flows and belongs to the technical field of marine and underwater vehicle engineering and hydraulic and hydro-power engineering. According to the connectional relation, a laser generator emits laser which is guided to an experimental model though a laser guide arm; the laser guide arm is connected in order with the laser generator and a computer mainframe case; a high-speed camera acquires an image which is transmitted to the computer mainframe case; a pressure sensor acquires a pressure strength signal which is transmitted to another computer through a signal conditioner and a data acquisition card; the top of an experimental segment is provided with transparent organic glass; a synchronous trigger switch controls the high-speed camera and the data acquisition card at the same time. The system has the advantages that various experimental measurement devices are enabled to synchronously observe and measure a cavitating flow field and finally, the unsteady cavitation process, which is complex multi-field coupling flow, is comprehensively researched on.
Description
Technical field
The present invention relates to a kind of unsteady flo w cavitating flows many field synchronizations measuring system based on circulating water tunnel, belong to boats and ships and submarine navigation device engineering, Hydraulic and Hydro-Power Engineering technical field.
Background technology
In high-velocity flow, when the pressure of a certain position is reduced to below saturated vapour pressure, cavitation phenomenon will be produced.Cavitating flows along with hole growth, the complicated UNSTEADY FLOW feature such as crumble and fall, this kind of phenomenon can produce a lot of adverse effect to hydraulic, such as surfacing damage, vibration & noise, and power loss etc.
Decades in the past, the experimental study for cavitation phenomenon is a lot, and research equipment mainly contains High-speed Photography Technology, particle velocity measuring technique PIV and laser Dppler veloicty measurement LDV laser-induced fluorescence (LIF) LIF and microminiature sensor.The appearance of these advanced laboratory facilities, promote going deep into that people are familiar with cavitation phenomenon, such as, kingdom's jade of Beijing Institute of Technology waits and adopts High-speed Photography Technology and particle velocity measuring technique PIV to have studied around aerofoil profile and the hole Form Development process of solid of revolution and the velocity field of cavitating flows respectively.The people such as the Wang Yong of Jiangsu University adopt High-speed Photography Technology and pressure transducer to acquire the hole form of cavitating flows and the vibration and noise signals of cavitating flow respectively.
But these testing equipments are all purpose instruments, for sports ground velocity survey, pressure field wall pressure stress measures and density field cavity form is carried out respectively.Current when experimental study cavitating flows characteristic, often adopt separately High-speed Photography Technology to take cavitation form or adopt separately the pressure surge of pressure transducer stream field to measure, lack the understanding to relation between synchronization various flows field variable, be difficult to comprehensively study the Complex Phenomena in Vertical Bell Jar of this multi-scenarios method of cavitation unsteady flo w process.
Summary of the invention
The object of the invention is cannot to obtain to solve existing employing single-measurement equipment experimental technique the problem of the density field of cavitating flows, sports ground and pressure field simultaneously, a kind of unsteady flo w cavitating flows many field synchronizations measuring system based on circulating water tunnel is provided.
The object of the invention is to be achieved through the following technical solutions.
Based on unsteady flo w cavitating flows many field synchronizations measuring system of circulating water tunnel, be made up of experiment porch, particle image velocimetry subsystem, pressure survey subsystem and synchronous triggers system four parts.
Experiment porch comprises test section, empirical model, transparent organic glass.High speed camera, laser instrument, sheet laser and light path system, data acquisition system (DAS);
Described empirical model bottom surface has tapped through hole, for setting pressure sensor; Pressure-sensitive face and the empirical model upper surface flush of pressure transducer;
Particle image velocimetry subsystem comprises laser guide arm, laser generator, high speed camera and computer host box and display.By regulating the energy grade of laser generator, the laser sheet brightness in cavitating flows region is made to reach the photographing request of high speed camera; Described high speed camera needs when installing to adopt rubber vibration isolation cushion and the dual isolation measure of sponge isolation cushion.
The sub-measurement subsystem of pressure comprises pressure transducer, signal conditioner, data collecting card and computer host box and display.
Synchronous triggers system comprises synchronous trigger switch.
Laser generator sends laser and is irradiated on empirical model by laser guide arm; Laser guide arm is connected with laser generator, computer host box successively; The picture transfer that high speed camera gathers is in computer host box; The pressure signal of pressure transducer collection is transferred in another computer by signal conditioner and data collecting card; Test section top is provided with transparent organic glass; Synchronous trigger switch controls high speed camera and data collecting card simultaneously;
The course of work: first, regulates flow parameter, makes to produce cavitating flows in the expansionary channel of circulating water tunnel test section; Then start particle image velocimetry subsystem and pressure survey subsystem respectively, particle image velocimetry and tonometric frequency acquisition and acquisition time length are set respectively; Next, particle image velocimetry subsystem and pressure survey subsystem is made to be in wait trigger state; Afterwards, cavitating flows state is observed from test section transparent organic glass, the triggering synchronous switch when observing cavitating flows state; Particle picture information and pressure fluctuation signal are stored to the computer be connected separately respectively.Finally, many field synchronizations image data is analyzed, experiment after completing above-mentioned steps, can be terminated.
Beneficial effect
1, the unsteady flo w cavitating flows many field synchronizations measuring system based on circulating water tunnel of the present invention, introduce synchronous triggering technique, various universal measuring device is combined, thus realizing kinds of experiments measuring equipment to the Synchronous of cavitating flow and measurement, final realization is comprehensively studied the Complex Phenomena in Vertical Bell Jar of this multi-scenarios method of cavitation unsteady flo w process.
2, the unsteady flo w cavitating flows many field synchronizations measuring system based on circulating water tunnel of the present invention, pressure-sensitive face and the empirical model upper surface flush of pressure transducer, namely pressure transducer directly contacts with flow region, and measurement data is more accurate.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the unsteady flo w cavitating flows many field synchronizations measuring system that the present invention is based on circulating water tunnel;
Fig. 2 is empirical model schematic diagram;
Fig. 3 is the longitudinal sectional drawing that sensor mounting location crossed by empirical model;
Fig. 4 is the transverse cross-sectional view that sensor mounting location crossed by empirical model;
Fig. 5 is the operational flowchart of the unsteady flo w cavitating flows many field synchronizations measuring system that the present invention is based on circulating water tunnel.
Wherein, 1-laser guide arm, 2-laser sheet, 3-transparent organic glass, 4-laser generator, 5-test section, 6-high speed camera, 7-computer host box, 8-display, 9-synchronous trigger switch, 10-pressure transducer, 11-signal conditioner, 12-data collecting card, 13-empirical model.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in detail.
Embodiment 1
Based on unsteady flo w cavitating flows many field synchronizations measuring system of circulating water tunnel, it is made up of experiment porch, particle image velocimetry subsystem, pressure survey subsystem and synchronous triggers system four parts, as shown in Figure 1.
Experiment porch comprises test section 5, empirical model 13, transparent organic glass 3.Described empirical model 13 bottom surface has tapped through hole, for setting pressure sensor 10, upper surface flush on the right side of the pressure-sensitive face of pressure transducer 10 and empirical model 13, wherein empirical model 13, the longitudinal sectional drawing crossing sensor mounting location and transverse cross-sectional view are respectively as shown in Figure 2, Figure 3 and Figure 4;
Particle image velocimetry subsystem comprises laser guide arm 1, laser generator 4, high speed camera 6 and computer host box 7 and display 8.By regulating the energy grade of laser generator 4, laser sheet 2 brightness in cavitating flows region is made to reach the photographing request of high speed camera 6; Described high speed camera needs when installing to adopt rubber vibration isolation cushion and the dual isolation measure of sponge isolation cushion.
The sub-measurement subsystem of pressure comprises pressure transducer 10, signal conditioner 11, data collecting card 12 and computer host box 7 and display 8.
Synchronous triggers system comprises synchronous trigger switch 9.
Laser generator 4 sends laser and is irradiated on empirical model 13 by laser guide arm 1; Laser guide arm 1 is connected with laser generator 4, computer host box 7 successively; The picture transfer that high speed camera 6 gathers is in computer host box 7; The pressure signal that pressure transducer 10 gathers is transferred in another computer by signal conditioner 11 and data collecting card 12; Test section 5 top is provided with transparent organic glass 3; Synchronous trigger switch 9 controls high speed camera 6 and data collecting card 12 simultaneously;
The course of work, as shown in Figure 5:
A. first, adjustment speed of incoming flow is 5m/s, makes to produce cavitating flows in the expansionary channel of circulating water tunnel test section 5;
B. particle image velocimetry subsystem and pressure survey subsystem is started respectively;
C. the frequency acquisition and the acquisition time length that arrange high speed camera 6 and pressure transducer 10 are respectively respectively 3000hz and 5s;
D. make particle image velocimetry subsystem and pressure survey subsystem be in wait trigger state, prepare the control signal receiving synchronous trigger switch at any time;
E. when observe in expansionary channel produce cavitating flows state time triggering synchronous switch 9, produce trigger pip, make particle image velocimetry subsystem and pressure survey subsystem start image data information simultaneously;
F. the particle image velocimetry information gathered and pressure fluctuation signal are stored to computer 7;
G. observe many field synchronizations image data on the display 8, the density field in a certain moment, velocity field and pressure field can be observed, and carry out the correlation analysis between many field information, if need to continue to measure, repeat d-g step;
H. experiment is terminated.
The data adopting above-mentioned measuring method to record are the same with the precision adopting high speed camera and pressure transducer to measure respectively separately, but, application of synchronized triggering technique, high speed camera can be controlled and pressure transducer gathers simultaneously, obtain the multiple information of flow of synchronization, for the research of the Complex Phenomena in Vertical Bell Jar of this multi-scenarios method of cavitating flows provides a great convenience.
Below only in order to technical scheme of the present invention to be described, those of ordinary skill in the art can modify to technical scheme of the present invention or equivalent replacement.All within the spirit and principles in the present invention make an amendment, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. based on unsteady flo w cavitating flows many field synchronizations measuring system of circulating water tunnel, it is characterized in that: be made up of experiment porch, particle image velocimetry subsystem, pressure survey subsystem and synchronous triggers system four parts;
Experiment porch comprises test section (5), empirical model (13), transparent organic glass (3);
Particle image velocimetry subsystem comprises laser guide arm (1), laser generator (4), high speed camera (6) and computer host box (7) and display (8); By regulating the energy grade of laser generator (4), laser sheet (2) brightness in cavitating flows region is made to reach the photographing request of high speed camera (6); Described high speed camera needs when installing to adopt rubber vibration isolation cushion and the dual isolation measure of sponge isolation cushion;
The sub-measurement subsystem of pressure comprises pressure transducer (10), signal conditioner (11), data collecting card (12) and computer host box (7) and display (8);
Synchronous triggers system comprises synchronous trigger switch (9);
Laser generator (4) sends laser and is irradiated on empirical model (13) by laser guide arm (1); Laser guide arm (1) is connected with laser generator (4), computer host box (7) successively; The picture transfer that high speed camera (6) gathers is in computer host box (7); The pressure signal that pressure transducer (10) gathers is transferred in another computer by signal conditioner (11) and data collecting card (12); Test section (5) top is provided with transparent organic glass (3); Synchronous trigger switch (9) controls high speed camera (6) and data collecting card (12) simultaneously.
2., as claimed in claim 1 based on unsteady flo w cavitating flows many field synchronizations measuring system of circulating water tunnel, it is characterized in that: described empirical model (13) bottom surface has tapped through hole, for setting pressure sensor (10); Pressure-sensitive face and empirical model (13) upper surface flush of pressure transducer (10).
3. as claimed in claim 1 based on unsteady flo w cavitating flows many field synchronizations measuring system of circulating water tunnel, it is characterized in that: the course of work: first, regulate flow parameter, make to produce cavitating flows in the expansionary channel of circulating water tunnel test section; Then start particle image velocimetry subsystem and pressure survey subsystem respectively, particle image velocimetry and tonometric frequency acquisition and acquisition time length are set respectively; Next, particle image velocimetry subsystem and pressure survey subsystem is made to be in wait trigger state; Afterwards, cavitating flows state is observed from test section transparent organic glass, the triggering synchronous switch when observing cavitating flows state; Particle picture information and pressure fluctuation signal are stored to the computer be connected separately respectively; Finally, many field synchronizations image data is analyzed, experiment after completing above-mentioned steps, can be terminated.
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| CN105890870A (en) * | 2016-03-31 | 2016-08-24 | 浙江工业大学 | Conflux vortex suction formation mechanism observation and experiment platform |
| CN106053015A (en) * | 2016-06-01 | 2016-10-26 | 北京理工大学 | Detachable cryogenic liquid cavitation flow observational test section |
| CN106289721A (en) * | 2016-08-18 | 2017-01-04 | 北京理工大学 | Attached type unsteady flo w cavitation internal fluid shock wave structure trap setting and method for catching |
| CN106323590A (en) * | 2016-08-22 | 2017-01-11 | 浙江大学 | Experiment device for stable multi-angle entering-into-water of object |
| CN106323595A (en) * | 2016-08-18 | 2017-01-11 | 北京理工大学 | Attached unsteady cavitation fluid internal structure observation device and method |
| CN107907300A (en) * | 2017-11-08 | 2018-04-13 | 北京理工大学 | A kind of water tunnel experiment shrinkage expansion runner self-checking device |
| CN107907296A (en) * | 2017-10-27 | 2018-04-13 | 清华大学 | The water tunnel experiment more field synchronization measuring systems of unsteady cavitation flow induced vibration |
| CN108036921A (en) * | 2017-11-13 | 2018-05-15 | 北京理工大学 | One kind suppresses natural cavitation bubble flow Shock Wave Characteristics high pressure air-breather |
| CN108120583A (en) * | 2018-01-20 | 2018-06-05 | 南京航空航天大学 | For measuring the device of hypersonic wind tunnel experiment dynamic pressure and space flow field |
| CN108757505A (en) * | 2018-07-10 | 2018-11-06 | 哈尔滨工程大学 | A kind of centrifugal pump flow field-pressure fluctuation coupling measurement experimental system |
| CN110006628A (en) * | 2019-05-22 | 2019-07-12 | 北京理工大学 | Underwater propeller jet flow field visual inspection system based on circulating water tunnel |
| CN110988391A (en) * | 2019-12-12 | 2020-04-10 | 北京机电工程研究所 | Experimental method for measuring unsteady cavitation flow field velocity |
| CN111351632A (en) * | 2020-04-24 | 2020-06-30 | 中国船舶科学研究中心 | Tip vortex cavitation vortex singing generation method |
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| CN113358312A (en) * | 2021-06-04 | 2021-09-07 | 北京理工大学 | Vortex-induced vibration synchronous measurement method based on high-speed cavitation water tunnel |
| CN114061889A (en) * | 2021-12-14 | 2022-02-18 | 南京航空航天大学 | Ultrasonic same-frequency observation device and method for directly displaying second modal wave |
| CN114659750A (en) * | 2022-03-14 | 2022-06-24 | 浙江理工大学 | Multi-physical-field synchronous trigger device measuring system for low-temperature cavitation |
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|---|---|---|---|---|
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5610227A (en) * | 1979-07-05 | 1981-02-02 | Mitsubishi Heavy Ind Ltd | Water tank for cavitation testing |
| SU1652851A1 (en) * | 1989-06-16 | 1991-05-30 | Предприятие П/Я Г-4126 | Cavitation tunnel |
| CN203894026U (en) * | 2014-05-09 | 2014-10-22 | 北京理工大学 | Gas flow rule testing apparatus in cavitation |
| CN104535292A (en) * | 2015-01-06 | 2015-04-22 | 北京理工大学 | Cryogenic liquid cavitation experimental device |
-
2015
- 2015-05-05 CN CN201510223779.8A patent/CN104807612B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5610227A (en) * | 1979-07-05 | 1981-02-02 | Mitsubishi Heavy Ind Ltd | Water tank for cavitation testing |
| SU1652851A1 (en) * | 1989-06-16 | 1991-05-30 | Предприятие П/Я Г-4126 | Cavitation tunnel |
| CN203894026U (en) * | 2014-05-09 | 2014-10-22 | 北京理工大学 | Gas flow rule testing apparatus in cavitation |
| CN104535292A (en) * | 2015-01-06 | 2015-04-22 | 北京理工大学 | Cryogenic liquid cavitation experimental device |
Non-Patent Citations (10)
| Title |
|---|
| A.YU.KRAVTSOVA等: "High-speed visualization and PIV measurement of cavitating flows around a semi-circular leading-edge flat plate and NACA0015 hydrofoil", 《INTERNATIONAL JOURNAL OF MULTIPHASE FLOW》 * |
| BIAO HUANG等: "Large Eddy Simulation of turbulent vortex-cavitation interactions in transient sheet/cloud cavitating flows", 《COMPUTERS &FLUIDS》 * |
| High-speed visualization and PIV measurement of cavitating flows around a semi-circular leading-edge flat plate and NACA0015 hydrofoil;A.Yu.Kravtsova等;《INTERNATIONAL JOURNAL OF MULTIPHASE FLOW》;20131231;第119-134页 * |
| Large Eddy Simulation of turbulent vortex-cavitation interactions in transient sheet/cloud cavitating flows;BIAO HUANG等;《COMPUTERS &FLUIDS》;20140103;第113-124页 * |
| 时素果等: "绕三维水翼云状空化现象的实验研究", 《应用力学学报》 * |
| 绕三维水翼云状空化现象的实验研究;时素果等;《应用力学学报》;20110430;第28卷(第2期);第105-110页 * |
| 绕平头回转体的空化流场研究;黄彪等;《科学技术与工程》;20101231;第10卷(第35期);第8730页 * |
| 绕轴对称体三维非定常空化流动的数值与实验研究;黄彪等;《水动力学研究与进展》;20111130;第26卷(第6期);第838-839页 * |
| 黄彪等: "绕平头回转体的空化流场研究", 《科学技术与工程》 * |
| 黄彪等: "绕轴对称体三维非定常空化流动的数值与实验研究", 《水动力学研究与进展》 * |
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