CN103076080B - Method for measuring tollmien-schlichting (T-S) waves in two-dimensional fluid passage based on local pressure - Google Patents
Method for measuring tollmien-schlichting (T-S) waves in two-dimensional fluid passage based on local pressure Download PDFInfo
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- CN103076080B CN103076080B CN201310003307.2A CN201310003307A CN103076080B CN 103076080 B CN103076080 B CN 103076080B CN 201310003307 A CN201310003307 A CN 201310003307A CN 103076080 B CN103076080 B CN 103076080B
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Abstract
The invention discloses a method for measuring tollmien-schlichting (T-S) waves in a two-dimensional fluid passage based on local pressure, and belongs to the technical field of flowing test. The method comprises the following steps of: connecting a circulating water pump and a flow meter to a circulation system of the two-dimensional fluid passage to be tested, establishing a self-circulating flowing system, arranging a pressure sensor in a contact way on the wall surface of the two-dimensional fluid passage, and drilling a hole leading to the interior of the fluid passage in the center of a contact surface; connecting the pressure sensor with a computer data acquisition system; enabling fluid in the fluid passage when entering the two-dimensional fluid passage through a measurement system pipeline to enter in a gradually varied flow form, and forming stable fully developed flow after the fluid passes through a flow stabilization inlet; and recording local pressure signals varied along with time under different flowing Reynolds numbers, and performing processing according to the time history of the local pressure to obtain the natural frequency and the amplitude of the T-S waves. Lower-order to higher-order T-S waves can be measured in any two-dimensional fluid passage, used related equipment is low in cost and convenient to popularize, and a data processing method is simple, intuitive and easy to master.
Description
Technical field
The invention belongs to flowing test technical field, relate to a kind of new method measuring T-S ripple in two-dimentional stream based on local pressure.
Background technology
There is the elementary cell of two-dimentional stream as reactor, heat interchanger of different wall configuration, be widely used in the fields such as the energy, petrochemical complex, biochemical industry and bio-pharmaceuticals.T-S ripple is the abbreviation of Tollmien-Schlichting wave, and it is the periodic flow instabilities behavior of one produced in two dimension stream when the Reynolds number flowed exceedes a certain critical value.When T-S ripple occurs, the in-situ velocity in stream presents a kind of form with the sine wave of certain amplitude and frequency in time.This frequency is referred to as the free-running frequency of T-S ripple.Large quantifier elimination shows, the thermal mass transfer rate in stream and the free-running frequency of T-S ripple have extremely close relation; If the free-running frequency of T-S ripple can be obtained, in former flowing, a vibrating flowing identical or close with this free-running frequency is superposed by certain technological means, original thermal mass transfer rate can be made to be increased exponentially, namely can obtain so-called resonance and transmit strengthening effect.Therefore, the free-running frequency that the means of testing by experiment obtain T-S ripple has great importance to the effective technique Mass and heat transfer process of employing.
According to the character of T-S ripple, the method measuring in-situ velocity in stream, record flow velocity course over time is usually adopted to catch T-S wave frequency and amplitude.Utilizing Laser Doppler Velocimeter (LDV) ideally can realize above-mentioned purpose, is method general at present.But well-known, LDV belongs to valuable testing apparatus, and its operation is also more complicated, does not have the possibility generally adopted.In addition there are some researches show, when T-S ripple occurs, except local velocity is except cyclical variation in time, affect by it, wall shear stress also presents similar behavior, therefore can also adopt the method for the time history of record wall shear stress and then obtain T-S ripple correlated frequency and amplitude properties.But usually measure the method also relative complex of wall shear stress, research is had to adopt electrochemical method to measure, need the concentration of configuration electrode, electrochemical solution, demarcation electrochemical solution and coefficient of diffusion, derive by the publicity etc. of dissufion current calculating wall shear stress according to boundary layer theory, not easily accurate assurance, practical application is also restricted.
Obtain T-S ripple according to local pressure at present and then show that the experimental test procedures of its free-running frequency and amplitude almost has no report.According to existing correlative study, since velocity perturbation when T-S ripple produces can cause wall shear stress produce the identical fluctuation of trend, the behavior as similar in local pressure presents of similar flow parameter so also will inevitably be inspired.This is foothold of the present invention.
Summary of the invention
The present invention proposes a kind ofly to utilize the time history of pressure transducer also measure local pressure, directly process and then obtain the method for T-S ripple free-running frequency to the pressure signal obtained.Operator only need the to be measured two-dimentional stream through current stabilization process ad-hoc location install specified type pressure transducer just can according to pressure signal over time data obtain free-running frequency and the amplitude of each rank T-S ripple, the method is suitable for the measurement of correlation of all two-dimentional streams.
Technical scheme of the present invention comprises the following steps:
Step 1: water circulating pump and flowmeter are connected in the circulation system of two-dimentional stream to be measured, set up self-loopa flow system;
Setting pressure sensor in two-dimentional flow path wall surface, adopts face to contact between pressure transducer with wall, inner in the centre-drilling hole straight through flow path of surface of contact, pressure transducer is connected with computer data acquisition system.
Design the current stabilization entrance of two-dimentional stream, the fluid in runner when entering into two-dimentional stream by measuring system pipeline is entered with the form of 15-20 degree gradually varied flow, after entrance, form stable fully developed flow move.
Step 2: utilize computer data acquisition system record local pressure time dependent signal under difference flowing Reynolds number.1 rank, 2 rank can be recorded to respectively so that the periodicity local pressure signal of more high-order when Reynolds number is increased to more than certain critical value.
Step 3: the free-running frequency and the amplitude that are obtained T-S ripple by the time history process of local pressure.The local pressure obtained by data processing intuitively presents the periodicity of T-S and frequency and amplitude characteristic.
The invention provides a kind of new method quick and precisely measuring T-S ripple, the measurement from low order to high-order T-S ripple can be completed in any two-dimensional flow road.The relevant device used is all that cost is low, and it is convenient to promote, and data processing method simple, intuitive, easily grasps.
Accompanying drawing explanation
Fig. 1 is self-loopa flow system schematic diagram.
Fig. 2 is local pressure test macro schematic diagram.
Fig. 3 is the T-S ripple represented with local pressure.
In figure: 1. centrifugal pump; 2. bypass valve; 3. operation valve; 4. flowmeter; 5. two-dimentional stream; 6. overflow groove; 7. circulating water chennel; 8. pressure transducer; 9. data collecting card; 10. computing machine;
Embodiment
Specific embodiments of the invention are described in detail below in conjunction with technical scheme and accompanying drawing.
Embodiment 1
For the two-dimentional groove stream shown in Fig. 2 in embodiment, build self-loopa flow system as shown in Figure 1.
Step 1 setting pressure sensor.Be that the piezoresistive pressure sensor (range 0 ~ 100kPa) of 8mm is arranged on hole-drilled groove stream and 5. goes up by diameter, and connect the signal circuit that 9. data collecting card go up, and connect the direct supply of power supply.
Step 2 starts the circulation that 1. centrifugal pump maintains flow system working fluid; 3. operation valve controls the flow entering test section; Flow is by electromagnetic flowmeter 4. accurate measurement; Test section outlet establishes overflow groove 6. to eliminate the impact of gravity.
Step 3 opens computing machine real-time data acquisition system 10., open large operation valve gradually and 3. increase flow, observe from computer display, start when local pressure presents cyclical signal to record with more than real time data 5 second of the local pressure of voltage display, preserve data file after data acquisition stops to computing machine.Repeat above-mentioned steps, continue the cyclical signal that augmented flow will obtain more high-order.
Step 4 data processing.According to the resistance value used in data-acquisition loop, converse real partial pressure value of each moment; Adopt means of filtering to process under certain bandwidth the time dependent data of local pressure, finally obtain the T-S ripple represented with local pressure as shown in Figure 3.The critical nature such as free-running frequency and amplitude of T-S ripple under different Reynolds number can be drawn easily from this figure.
Claims (1)
1. measure a method for T-S ripple in two-dimentional stream based on local pressure, its feature comprises the following steps,
Step 1: water circulating pump and flowmeter are connected in the circulation system of two-dimentional stream to be measured, set up self-loopa flow system;
Setting pressure sensor in two-dimentional flow path wall surface, adopts face to contact between pressure transducer with wall, inner in the centre-drilling hole straight through flow path of surface of contact; Pressure transducer is connected with computer data acquisition system;
Fluid in runner when entering into two-dimentional stream by self-loopa flow system pipeline enters with the form of 15-20 degree gradually varied flow, forms stable fully developed flow and move after current stabilization entrance;
Step 2: utilize computer data acquisition system record local pressure time dependent signal under difference flowing Reynolds number; 1 rank, 2 rank can be recorded to respectively so that the periodicity local pressure signal of more high-order when Reynolds number is increased to more than certain critical value;
Step 3: the free-running frequency and the amplitude that are obtained T-S ripple by the time history process of local pressure; The local pressure obtained by data processing intuitively presents the periodicity of T-S and frequency and amplitude characteristic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310003307.2A CN103076080B (en) | 2013-01-06 | 2013-01-06 | Method for measuring tollmien-schlichting (T-S) waves in two-dimensional fluid passage based on local pressure |
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| CN201310003307.2A CN103076080B (en) | 2013-01-06 | 2013-01-06 | Method for measuring tollmien-schlichting (T-S) waves in two-dimensional fluid passage based on local pressure |
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| CN103076080A CN103076080A (en) | 2013-05-01 |
| CN103076080B true CN103076080B (en) | 2014-12-24 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3005526B1 (en) * | 1998-07-21 | 2000-01-31 | 川崎重工業株式会社 | Method of determining aircraft wing and wing shape |
| CN101226041A (en) * | 2008-01-31 | 2008-07-23 | 陈卫东 | Method for fluid reynolds number in pipe line to improve heat exchange efficacy as well as stirring machine |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3005526B1 (en) * | 1998-07-21 | 2000-01-31 | 川崎重工業株式会社 | Method of determining aircraft wing and wing shape |
| CN101226041A (en) * | 2008-01-31 | 2008-07-23 | 陈卫东 | Method for fluid reynolds number in pipe line to improve heat exchange efficacy as well as stirring machine |
Non-Patent Citations (3)
| Title |
|---|
| JP特许第3005526号B1 2000.01.31 * |
| The mechanics of the Tollmien-Schlichting wave;PETER G.BAINES et al.;《J.Fluid Mech.》;19961231;第312卷;107-124 * |
| 脉动作用下波壁管内非牛顿流体流动特性的研究;张亮等;《实验流体力学》;20111231;第25卷(第6期);59-65 * |
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