CN103471809A - Ultrahigh frequency response plasma flow measurement device - Google Patents
Ultrahigh frequency response plasma flow measurement device Download PDFInfo
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- CN103471809A CN103471809A CN2013104136542A CN201310413654A CN103471809A CN 103471809 A CN103471809 A CN 103471809A CN 2013104136542 A CN2013104136542 A CN 2013104136542A CN 201310413654 A CN201310413654 A CN 201310413654A CN 103471809 A CN103471809 A CN 103471809A
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Abstract
The invention discloses an ultrahigh frequency response plasma flow measurement device. The ultrahigh frequency response plasma flow measurement device comprises an amplifier, a frequency and voltage conversion device, a plasma probe or sensor, a modulation-demodulation device and a data acquisition device. A voltage provided by a power source passes through the amplifier and the frequency and voltage conversion device in sequence and produces a high-frequency and high-voltage level, the high-frequency and high-voltage level is applied to the two ends of the plasma probe or sensor, and a plasma field is excised between two electrodes of the plasma probe or between two electrodes of the sensor; incoming current fluctuating speed or wall surface unsteady pressure fluctuation contained in the high-frequency and high-voltage level is detected by a high-voltage probe and transmitted to the modulation-demodulation device, the modulation-demodulation device decomposes the high-frequency and high-voltage level, current field signals are separated from the high-frequency and high-voltage level, and acquisition, storage and analysis are completed in the data acquisition device. By means of the ultrahigh frequency response plasma flow measurement device, the requirements for high spatial resolution and temporal resolution can be met simultaneously, and measurement of current field high-frequency pulsation and a vortex structure is achieved.
Description
Technical field
The present invention relates to Aero-Space medium-high frequency, high enthalpy and high speed Unsteady Flow field of measuring technique, especially for a kind of super-high frequency response plasma flow measurement mechanism of turbomachine inside complex three-dimensional nonstationary flow field measurement.
Background technology
The development of any theory all be unable to do without experiment, and Aero-Space High Mach number, high turbulence pulsation, high enthalpy flow and be unable to do without, and Aerothermodynamics of Turbomachinery also be unable to do without.Because turbomachine is typical three-dimensional, unsteady complex flow, it has comprised High Mach number, high turbulence pulsation, high enthalpy and has flowed, and to the measurement in its flow field, is also the difficult problem that this field needs surging and solution always.Develop rapidly along with science and technology of aviation, the design optimization of turbomachine is also from early stage one dimension designs full three-dimensional design till now, the development of computer hardware and software is only depended in the development of Digital calculation modelling software, and the many multi-disciplinary Parallel Developments of the development need of experiment measuring means: material, electronics, computing machine and processing manufacturing industry, cause the experiment measuring means to lag behind numerical evaluation always, can't provide reliable experimental data for numerical evaluation.
Because early stage turbomachinery design method is to add experiential modification in two dimension on without viscosity flow model basis, so, test method is mostly the TWO-DIMENSIONAL CASCADE experiment, and corresponding measuring method mostly is steady pressure and the temperature measuring tools such as pitot tube, porous probe, thermopair.Along with theoretical developments, to accurate three-dimensional three-dimensional flow model, pneumatic plant and the turbine testing table of all kinds of low speed/high speed emerge in an endless stream, and the surveying instruments such as hot-wire anemometer, piezoresistive dynamic pressure sensor also arise at the historic moment.Along with improving constantly of compressor pressure ratio, turbine inlet temperature, the turbomachine internal flow becomes increasingly complex, and the non-permanent effect of complete three peacekeeping is more and more significant, and the CFD analog capability of the Complex Flows such as angular region, leakage flow is more and more stronger, and computational accuracy is also more and more higher.The CFD of take calculates and to add that design means that the intelligent optimization theory is core is progressively replacing the past and adding the Design Mode of experimental formula to simplify theoretical model.As the fundamental means of checking CFD result of calculation, it is extremely important that experimental study seems.The at full speed progress of CFD on non-permanent and full Three dimensional Turbulent N-S equation also just proposed new requirement to experimental study, in the urgent need to advanced internal measurement means, catches and extract mobile non-permanent information and the fine structure of three-dimensional flow field.
Continuous renewal development along with CFD technology and measurement means, still there are a lot of difficult problems in the urgent need to address in the turbomachine field: one, rotating stall and the astable phenomenon of surge are implemented to the driving power that effective control is traction pneumatic plant flow unstable mechanism and control technology research always.Current advanced engine adopts active control technology in a large number, require Real-Time Monitoring pneumatic plant state, requirement to frequency response is very high, and some be take the engine that sharp type stall tendency is the unstability approach of dashing forward and the abnormal pulsation of pressure or speed need within several milliseconds, be detected and start corresponding control device.For reserving the response time to mechanical actuation mechanism, detect and judgement must complete within tens of microseconds, the frequency response demand of sensor may be up to the rank of 1MHz, yet still there is no the technology that can meet this requirement at present.Its two, the low reynolds number low-pressure turbine often occurs that boundary-layer separates and turns and twists phenomenon, for the measurement of Boundary Layer Transition process, require surveying instrument to have high frequency sound, small size, and stream field affects minimum characteristics.Although the most ripe hotting mask technology of development can be resolved the space structure of boundary-layer at present, its frequency response is too low, can not meet far away equally up to other flow field fluctuation measurement demand of 1MHz level.Its three, in the High Mach number turbomachine, the stability of shock wave and turbomachine has direct relevance.It is very difficult that the shock wave motion is directly measured in experiment, the normal indirect method of measurement that adopts, use the multi-channel high-speed synchronous, utilize the dynamic pressure transducer of high precision, small size, high frequency sound, and genlock device (adopt external trigger signal that magnet steel-inductor wire ring type signal generator provides), change to measure shock-wave spot the intermittence of catching each measuring point transient pressure of shock wave motor area wall and rate of heat flow.Yet, to being positioned at the flow phenomenon of the local sudden change of this class of shock wave within rotating coordinate system, under main dependence absolute coordinate system, the high frequency sound sensor is realized meticulous spatial resolution, and current surveying instrument also is not enough to tell the precision that is enough to verify numerical result.
In sum, for the Strategic Demand of current Aerothermodynamics of Turbomachinery development, in the urgent need to probe, the sensor of super-high frequency response (being that frequency response reaches 1MHz).Other frequency response of this grade can not realize by traditional piezoelectric ceramics, heated filament or hotting mask, need new principle and new method.In fact, as far back as 1934, also the California Institute of Technology under the Feng Kamen leader just proposed to make the high frequency sound velocity probe by plasma glow discharge principle at that time, and obtained the your kind effort support that the Laboratory Chief-Feng Kamen teaches at that time.At that time, Lindvall just proposed glow discharge is applied to wind gage.He utilizes direct current glow discharge to measure the cylinder wake velocity.1949, the Mettler of California Institute of Technology successfully developed a direct current glow discharge wind gage that noise is low, and tests successfully under 1.6 Mach numbers.He also is studied the quantitative theory of air draught glow discharge, finds that wind gage is to temperature insensitive.Nineteen fifty-five Werner has designed and can measure 0.8 Mach number and flow, and uncompensated frequency response is at least the wind gage of 100kHz.In the glow discharge anemometer of development, the direct current of Vrebalovich (1954) and alternating current glow discharge design are relatively given prominence in early days.Especially direct current designs that As time goes on the electrode degrading aspect is more superior.He utilizes the direct drive probe, can measure the boundary-layer of Mach number from 1.3 to 4, and has the 700kHz carrier frequency.But, because Aerothermodynamics of Turbomachinery does not at that time also develop into the corresponding stage, the probe leading to this class technology do not have demand, electronic engineering is also very poor with the level of signal processing simultaneously, so this class probe lies on the table.Current, the flow control technique that the plasma of take is carrier is the study hotspot of fluid force educational circles at last decade always, and associated electrical and control technology obtain significant progress and progress.Therefore, the present invention proposes take ultrahigh frequency probe that plasma is carrier, sensor will as at a high speed, high frequency and high enthalpy flow measurement provide new solution route.
Surveying instrument is as key one ring of turbomachine development, and both the accuracy by theoretical research and calculating simulation was relied on, and design typification and the manufacture for turbomachine provides foundation again.In very long aerothermodynamics development course, there are two quasi-instruments to do and appear remarkable contribution and still bringing into play huge effect.Piezoresistive transducer is to use the widest pressure-measuring instrument, and the data that it records were once the foundation stones of Elementary Fluid Mechanics theory.The hot wire anemometer that almost monopolizes whole wind gage market is just the turbulent boundary layer structure, and Shock Wave Boundary Layer interferes the development of scheduling theory to make distinctions won on the battlefield.The invention of these instruments has all brought the progress of aerothermodynamics, thereby provides theory support and technical guarantee for industrial upgrading widely.But, due to the impact that is subject to mass inertia and thermal inertia, the frequency response of piezoresistive transducer and hot line can't be higher than 500kHz.In order to break through this restriction, the present invention proposes based on the glow discharge principle plasma probe and sensor, frequency response is up to 1MHz, and develops integrated collection, storage and analyze the measuring system in one, forms the ultrahigh frequency UNSTEADY FLOW measuring technique of establishing one's own system.
The plasma flow measuring technique that the present invention proposes is the new technology that a bright characteristic has broad prospect of application.This sensor grown up with the glow discharge principle and probe have the frequency response of 1MHz at least, with traditional thermodynamics sensor, piezoresistive transducer contrast, there are a lot of significant advantages, be particularly suitable for strong the shearing and the high frequency UNSTEADY FLOW of three-dimensional in turbomachine.
This alternating current plasma sensor and probe can also solve that the thermodynamics sensor for temperature extremely relies on, calibration process is difficult to and generally is not suitable for the mobile problem of high enthalpy High Mach number, and the dynamic pressure transducer non-refractory, frequency response is not high enough and bulky problem, realization is to shock-wave spot and intensity, and high static sensitivity, high-frequency response and the moving measurement of high enthalpy hypersonics, therefore, also be suitable for very much carrying out the various of hypersonic measurement and flow, also have wide practical use in fields such as space flight, advanced weaponries.
Summary of the invention
(1) technical matters that will solve
In view of this, fundamental purpose of the present invention is to provide a kind of super-high frequency response plasma flow measurement mechanism, to solve existing surveying instrument because frequency response is low, size is large, and can't the detailed measurements high speed, the problem in Gao Han, high frequency flow field, catch high frequency flow field systolic structures by measuring in the high enthalpy of high speed flow field, reach the purpose of the inner Complex Flows mechanism of quantitative test turbomachine.
(2) technical scheme
For achieving the above object, the invention provides a kind of super-high frequency response plasma flow measurement mechanism, this device comprises amplifier, variable-frequency variable-voltage device, plasma probe or sensor, modulation-demodulation device and data collector, wherein: the voltage that power supply provides is successively by after amplifier and variable-frequency variable-voltage device, produce the high-frequency and high-voltage level, to meet the demand of activated plasma; After this high-frequency and high-voltage level is applied to the two ends of plasma probe or sensor, inspiring plasma field between two electrodes of plasma probe or between two electrodes of sensor, the plasma field inspired between two electrodes of plasma probe is in order to measure upstream oscillating flow speed, and the plasma field inspired between two electrodes of sensor is in order to measure the non-steady pressure fluctuation of wall; Modulation-demodulation device is surveyed and is transferred in the upstream oscillating flow speed or the non-steady pressure fluctuation of wall that are included in high-frequency and high-voltage voltage by high-voltage probe, modulation-demodulation device is compressed into row to this high-frequency high-voltage and is decomposed, the flow field signal is separated from high-frequency and high-voltage voltage, and transfer to data collector, complete collection, storage and analyze in data collector.
In such scheme, described plasma probe has identical measuring principle with described sensor, just measures the purposes difference, and described plasma probe is arranged in flow field, in order to measure upstream oscillating flow speed; Described installation of sensors is at wall, in order to measure the non-steady pressure fluctuation of wall.
In such scheme, described plasma probe is identical with the structure of described sensor measurement part, include two electrodes, insulation insulating space, insulating support and contact conductor, two electrodes are fixed on insulating support, measure for preventing that electrode from partly showing a film to ring, adopt the insulation insulating space by two electrodes separately, then by contact conductor, two electrodes are applied to certain voltage, air to electrode gap between two electrode tips is ionized, and produces plasma.
In such scheme, the material that described electrode is selected is platinum or iridium.Described electrode adopts ganoid planar-shaped, semicircle or unsymmetrical electrode.Described electrode gap is between between 0.064mm to 0.17mm.
In such scheme, the overall diameter of described probe is less than 2mm, has very high spatial resolution and temporal resolution, can be used in and measure turbomachine channel interior high frequency velocity fluctuation, and turbulence pulsation distributes.
In such scheme, described data collector selects the DSP high-speed collection card of TI6000 series to realize, the speed read-write high frequency sound dynamic data with frequency acquisition tens MHz to MHz up to a hundred.
In such scheme, for the variation of Real Time Observation dynamic data, realize the ability of on-line data analysis, the data analysing method that described data collector adopts comprises: fft analysis, correlation analysis or power spectrumanalysis.
In such scheme, in order to realize that described data collector is realized the quick storage of data by the peripheral hardware USB port to the storage of magnanimity high-frequency data and off-line analysis.
(3) beneficial effect
Super-high frequency response plasma flow measurement mechanism provided by the invention, advantage is:
1, super-high frequency response plasma flow measurement mechanism provided by the invention, with traditional piezoresistive transducer, hot-wire anemometer and the dynamic probe based on piezoresistive transducer, compare, it has very high frequency response, more than frequency response can reach 1MHz, considerably beyond the response frequency response of like product.
2, super-high frequency response plasma flow measurement mechanism provided by the invention, adopt the glow discharge principle on principle, and the comparative maturity that the glow discharge principle develops at present, and to the understanding of the inferior discharge principle of soup also than darker in early days, feasible on principle is the basic guarantee of plasma probe and sensor design and processing.
3, super-high frequency response plasma flow measurement mechanism provided by the invention, the one-piece construction size is less, maximum gauge is no more than 1mm, the diameter of plasma probe head and support is all smaller, the size of sensor is also very little in addition, diameter is less than 1mm, and the impact of stream field is very little, has reached higher spatial resolution.
4, super-high frequency response plasma flow measurement mechanism provided by the invention, have very high susceptibility, in Mach 2 ship 5, still extremely sensitive to average and the fluctuation composition of mass flux.
5, super-high frequency response plasma flow measurement mechanism provided by the invention, adopt modulation-demodulation device to provide good output signal, the common-mode rejection ratio that tool is good; And signal to noise ratio (S/N ratio) is higher than hot line.
6, super-high frequency response plasma flow measurement mechanism provided by the invention, be applicable to hot environment, while adopting iridium as electrode material, can under the environment of 1000 ℃, work.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of super-high frequency response plasma flow measurement mechanism based on the glow discharge principle according to the embodiment of the present invention;
Fig. 2 is the structural representation according to the super-high frequency response plasma flow measurement mechanism of the embodiment of the present invention.
Fig. 3 is the schematic diagram of Fig. 2 applying plasma probe;
Fig. 4 is the schematic diagram of sensor in Fig. 2;
Fig. 5 a and Fig. 5 b are the schematic diagram of being measured according to the employing super-high frequency response plasma flow measurement mechanism of the embodiment of the present invention; Wherein, Fig. 5 a adopts plasma sensor, and Fig. 5 b adopts probe;
Fig. 6 a and Fig. 6 b are the caliberating device schematic diagram according to the super-high frequency response plasma flow measurement mechanism of the embodiment of the present invention, and wherein, Fig. 6 a is that peripheral flow is demarcated schematic diagram, and Fig. 6 b is that schematic diagram is demarcated in the sound field excitation.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and, with reference to accompanying drawing, the present invention is described in more detail.
The invention provides a kind of super-high frequency response plasma flow measurement mechanism, this installs based on the glow discharge principle, as shown in Figure 1, apply certain voltage between electrode after, will produce plasma field.When speed of incoming flow and pressure variation, can affect the distribution of plasma between electrode, like this, for the plasma maintained between electrode is uniformly distributed, added voltage will change thereupon, by the fluctuation of added voltage fluctuation reaction speed of incoming flow field and pressure field on potential electrode.Therefore, the impact that the present invention distributes by experiencing the pulsation of speed of incoming flow field and wall pressure field pulsation plasma, catch the Unsteady Flow details in detail.
The measuring principle of plasma probe: based on the glow discharge principle, by loading alternating voltage, form plasma area between electrode.When there is no external drive, the electronics on anodic-cathodic and electric charge will be uniformly distributed, and electronics and the movement locus of electric charge between electrode are straight line.When measure using, the plasma probe is placed in to flow field, once after speed of incoming flow produces, the speed of electron motion is electric charge about 350 times, substantially be not subject to the impact of incoming flow.But the charge movement track can make the plasma motion track between electrode and distribute also to change because the impact of speed of incoming flow changes, and in order to maintain the homogeneity of plasma between electrode, on electrode, on-load voltage also can produce fluctuation thereupon.Therefore can realize the seizure to the upstream oscillating flow details by the impact of experiencing the distribution of upstream oscillating flow plasma.
Super-high frequency response plasma flow measurement mechanism provided by the invention, alive carrier frequency is depended in the frequency response of measuring, and carrier frequency can be accomplished enough height, even can surpass 2MHz, plasma probe and the sensor invented have sufficiently high frequency response.In addition, because adopted plasma probe and sensor require higher to electrode material, and electrode size only has a few tenths of a mm, make the size of invented plasma probe and sensor little, there is very high spatial resolution, stream field does not have impact substantially, can be good at catching eddy structure and Pulse Pressure with High Frequency field.
As shown in Figure 2, Fig. 2 is the structural representation according to the super-high frequency response plasma flow measurement mechanism of the embodiment of the present invention, this device is by loading HF voltage at plasma probe or sensor electrode two ends, activated plasma, and experience the non-permanent fluctuation of incoming flow, by the voltage fluctuation between the high-voltage probe potential electrode, signal is by after modulation-demodulation device, get final product the flow field fluctuation voltage of rediscover, and it is carried out to collection analysis etc.This device comprises amplifier, variable-frequency variable-voltage device, plasma probe or sensor, modulation-demodulation device and data collector, wherein: the voltage that power supply provides is successively by after amplifier and variable-frequency variable-voltage device, produce the high-frequency and high-voltage level, to meet the demand of activated plasma; After this high-frequency and high-voltage level is applied to the two ends of plasma probe or sensor, inspiring plasma field between two electrodes of plasma probe or between two electrodes of sensor, the plasma field inspired between two electrodes of plasma probe is in order to measure upstream oscillating flow speed, and the plasma field inspired between two electrodes of sensor is in order to measure the non-steady pressure fluctuation of wall; Modulation-demodulation device is surveyed and is transferred in the upstream oscillating flow speed or the non-steady pressure fluctuation of wall that are included in high-frequency and high-voltage voltage by high-voltage probe, modulation-demodulation device is compressed into row to this high-frequency high-voltage and is decomposed, the flow field signal is separated from high-frequency and high-voltage voltage, and transfer to data collector, complete collection, storage and analyze in data collector.
Wherein, plasma probe has identical measuring principle with sensor, just measures the purposes difference, and described plasma probe is arranged in flow field, in order to measure upstream oscillating flow speed; Described installation of sensors is at wall, in order to measure the non-steady pressure fluctuation of wall.Particularly, sensor is identical with the measurement physical principle of plasma probe, but shorter and smaller than plasma probe, by being arranged on the tested device wall, such as casing wall, dull and stereotyped inwall etc., by experiencing the impact of the non-steady pressure plasma of wall field distribution, measure the non-steady pressure distribution of wall, Boundary Layer Transition etc.
As shown in Fig. 3, Fig. 4 and Fig. 5, plasma probe is identical with the structure of sensor measurement part, include two electrodes, insulation insulating space, insulating support and contact conductor, two electrodes are fixed on insulating support, measure for preventing that electrode from partly showing a film to ring, adopt the insulation insulating space by two electrodes separately, then by contact conductor, two electrodes are applied to certain voltage, air to electrode gap between two electrode tips is ionized, and produces plasma.The material that electrode is selected is platinum or iridium.Described electrode adopts ganoid planar-shaped, semicircle or unsymmetrical electrode.Described electrode gap is between between 0.064mm to 0.17mm.The overall diameter of probe is less than 2mm, has very high spatial resolution and temporal resolution, can be used in and measure turbomachine channel interior high frequency velocity fluctuation, and turbulence pulsation distributes.
Voltage carrier frequency between electrode is very high, can surpass 2MHz, makes the frequency response of plasma probe and sensor also very high, has sufficiently high temporal resolution, can catch exactly dither.Because the fluctuation of Unsteady Flow is carried on carrier frequency, for pressure and the velocity distribution of quantitative acquisition Unsteady Flow, adopt the modulating and demodulating signal device, by carrier wave and non-permanent fluctuation separately, accurately obtain frequency and the amplitude of non-permanent fluctuation.
The size of plasma probe and sensor is little, has sufficiently high spatial resolution, and stream field disturbs little, can catch more Flow details.The size of plasma probe is very little, interelectrode distance is less than 1mm, and the overall diameter of probe, less than 2mm, has very high spatial resolution and temporal resolution, can be for measuring turbomachine channel interior high frequency velocity fluctuation, and turbulence pulsation distributes.Because electrode size is very little, in order to prevent that between electrode, long-term electric discharge causes electrode burn, adopt more durable sensing element, as platinum, iridium or other alloy materials.
The Unsteady Flow fluctuation data that surpass 1MHz in order to gather frequency response, data collector selects the DSP high-speed collection card of TI6000 series to realize, read and write the high frequency sound dynamic data with frequency acquisition tens MHz to the speed of MHz up to a hundred, realize the function of multi-channel data acquisition, mass data storage and on-line analysis.For the variation of Real Time Observation dynamic data, realize the ability of on-line data analysis, the data analysing method that data collector adopts comprises: fft analysis, correlation analysis or power spectrumanalysis.In order to realize that data collector is realized the quick storage of data by the peripheral hardware USB port to the storage of magnanimity high-frequency data and off-line analysis.
As shown in Fig. 3, Fig. 4, Fig. 5 a and Fig. 5 b, unsteady interaction and stall tendency between plasma probe and the enough seizure pneumatic plant tail eddy structures of sensor energy, sound detect, the inner high enthalpy Flow details of turbine, and the channel interior flow field of pneumatic plant high pressure stage and the high enthalpy high pressure stage of turbine.For design and the optimization of turbomachine provides detailed measurement data and foundation, make the performance of turbomachine obtain higher lifting.
In super-high frequency response plasma flow measurement mechanism, according to measuring, need to select to adopt probe and sensor, the parts of its main core are plasma probe or sensor, also have data collector.The present invention is mainly also for plasma probe and sensor, also has data collector to formulate following concrete embodiment;
Manufacture craft:
At first be the electrode material type selecting, because plasma probe and sensor will guarantee the existence always of plasma between electrode in measuring process, this just needs electrode material will guarantee glow discharge sufficiently long stabilization time to reduce as far as possible electrode sputter and noise level; Material itself has high thermal conductivity, specific heat and electric conductivity, to keep electrode temperature, approaches gas flow temperature, reduces the curent change that the temperature difference causes; Material should have good manufacturability, can make given geometric configuration, guarantees surfaceness.The present invention will mainly be usingd the materials such as the platinum of thinking at present reliable, iridium as electrode material, while adopting iridium as electrode material, can under the environment of 1000 ℃, work.
Then be choosing of electrode structure shape.In low speed flows, electrode gap, electrode shape and reduce glow current, all can improve the susceptibility of aura to speed.Electrode structure shape of the present invention mainly contains: planar-shaped, semicircle and unsymmetrical.Any rough part of electrode surface all can affect the stability of glow discharge in addition, raised or sunken position all can cause the electric-force gradient uncontinuity, thereby electron focusing causes local temperature to raise on these aspects, melt electrode, this is one of reason produced sputter.Therefore, the manufacturing process upper electrode surface is more smooth, and the aura power generation stabilization is also just better.
Finally choosing of electrode gap.Because electrode gap is larger, plasma is easily escaped, and spatial resolution is low; And electrode gap is less, spatial resolution is high, but electrode is easily breakdown, and the electrode gap difference also can be different to the susceptibility in the friction speed scope.Therefore the plasma probe that the present invention proposes and the gap between sensor electrode are approximately from 0.064mm to 0.17mm.
Demarcate technique:
At first be that stable state is demarcated.On wind-tunnel, the different speed of incoming flow of change, demarcated developed plasma probe output voltage and the relation between speed of incoming flow, thereby draw the responsive velocity range of plasma.For the demarcation of pressure, adopting the normal pressure tester to demarcate speed of incoming flow is 0 o'clock, and the relation between plasma probe output voltage and ambient pressure variations is demarcated.And pass through fixedly incoming flow Mach number on wind-tunnel, demarcate under different speed of incoming flow conditions the relation between plasma probe output voltage and pressure change.
Next is dynamic calibration.Dynamic calibration mainly is divided into the Frequency Response analysis to the Frequency Response of fluctuation velocity and fluctuation pressure.The plasma probe proposed due to the present invention and the frequency response of sensor are very high, up to 1MHz, existing dynamic calibration apparatus-shock tube, although can obtain good step response, but the measuring equipment that needs frequency response to surpass plasma probe and sensor in calibration process is measured and is caught step response, and this obviously can't meet.Therefore the present invention proposes following two kinds of dynamic calibrating methods, as described in Fig. 6 a: when fluctuation velocity is measured, frequency by turbulence pulsation in tail after measurement cylinder flow-disturbing, and by changing different speed of incoming flow, obtain after the cylinder flow-disturbing of different frequency turbulence pulsation in tail, thereby can detect the Frequency Response that the plasma probe is measured fluctuation velocity.When fluctuation pressure is measured, need to obtain the very high pulsation source of frequency response, existing laboratory is difficult to obtain the pulsation source of frequency response up to 1MHz, and the present invention proposes to adopt by the sound field energisation mode and produces the high-frequency pressure pulsation, carries out dynamic calibration, as shown in Figure 6 b.
Data collector
The plasma probe that the embodiment of the present invention adopts and sensor have super-high frequency response (1MHz), the characteristics such as high temperature resistant, and traditional acquisition system can't meet the demands.In order it to be generalized in actual measurement application, need to solve on-line analysis and the problem such as easy to carry of high-frequency data collection, mass data storage and read-write, data.Therefore this project is intended, on the basis of plasma probe and sensor design and experiment measuring, developing the integrated plasma probe/sensor measuring system of a set of height.Realize that by the dsp chip of selecting TI6000 series frequency acquisition is up to tens MHz, the speed of MHz even up to a hundred read-write high frequency sound dynamic data.For the variation of Real Time Observation dynamic data, realize the ability of on-line data analysis, analytical approach mainly comprises: fft analysis, correlation analysis, power spectrumanalysis etc. simultaneously.In order to realize, the storage of magnanimity high-frequency data and off-line analysis are realized to the quick storage of data by the peripheral hardware USB port in addition.
This super-high frequency response plasma flow measurement mechanism based on the glow discharge principle provided by the invention, relate to aerospace field, measurement for current High Mach number, high turbulence pulsation and high-enthalpy fluid, utilize plasma probe provided by the invention and sensor surveying unit, can meet high spatial resolution and temporal resolution requirement simultaneously, frequency response can surpass 1MHz, realizes the detailed measurements of stream field dither, eddy structure.Can the quantitative test turbomachine inner UNSTEADY FLOW of the present invention, to with aeromotor flow field survey and the performance optimization of the following high speed developed, the distribution of high enthalpy, playing vital effect now, even can develop into the mobile measurement of the outside high enthalpy of high speed of Aero-Space.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a super-high frequency response plasma flow measurement mechanism, is characterized in that, this device comprises amplifier, variable-frequency variable-voltage device, plasma probe or sensor, modulation-demodulation device and data collector, wherein:
The voltage that power supply provides, successively by after amplifier and variable-frequency variable-voltage device, produces the high-frequency and high-voltage level, to meet the demand of activated plasma; After this high-frequency and high-voltage level is applied to the two ends of plasma probe or sensor, inspiring plasma field between two electrodes of plasma probe or between two electrodes of sensor, the plasma field inspired between two electrodes of plasma probe is in order to measure upstream oscillating flow speed, and the plasma field inspired between two electrodes of sensor is in order to measure the non-steady pressure fluctuation of wall; Modulation-demodulation device is surveyed and is transferred in the upstream oscillating flow speed or the non-steady pressure fluctuation of wall that are included in high-frequency and high-voltage voltage by high-voltage probe, modulation-demodulation device is compressed into row to this high-frequency high-voltage and is decomposed, the flow field signal is separated from high-frequency and high-voltage voltage, and transfer to data collector, complete collection, storage and analyze in data collector.
2. super-high frequency response plasma flow measurement mechanism according to claim 1, it is characterized in that, described plasma probe has identical measuring principle with described sensor, just measures the purposes difference, described plasma probe is arranged in flow field, in order to measure upstream oscillating flow speed; Described installation of sensors is at wall, in order to measure the non-steady pressure fluctuation of wall.
3. super-high frequency response plasma flow measurement mechanism according to claim 2, it is characterized in that, described plasma probe is identical with the structure of described sensor measurement part, include two electrodes, the insulation insulating space, insulating support and contact conductor, two electrodes are fixed on insulating support, for preventing that electrode from partly showing a film to ring, measure, adopt the insulation insulating space by two electrodes separately, then by contact conductor, two electrodes are applied to certain voltage, air to electrode gap between two electrode tips is ionized, produce plasma.
4. super-high frequency response plasma flow measurement mechanism according to claim 3, is characterized in that, the material that described electrode is selected is platinum or iridium.
5. super-high frequency response plasma flow measurement mechanism according to claim 3, is characterized in that, described electrode adopts ganoid planar-shaped, semicircle or unsymmetrical electrode.
6. super-high frequency response plasma flow measurement mechanism according to claim 3, is characterized in that, described electrode gap is between between 0.064mm to 0.17mm.
7. super-high frequency response plasma flow measurement mechanism according to claim 1, it is characterized in that, the overall diameter of described probe is less than 2mm, there is very high spatial resolution and temporal resolution, can be used in and measure turbomachine channel interior high frequency velocity fluctuation, and turbulence pulsation distributes.
8. super-high frequency response plasma flow measurement mechanism according to claim 1, it is characterized in that, described data collector selects the DSP high-speed collection card of TI6000 series to realize, the speed read-write high frequency sound dynamic data with frequency acquisition tens MHz to MHz up to a hundred.
9. super-high frequency response plasma flow measurement mechanism according to claim 1, it is characterized in that, variation for the Real Time Observation dynamic data, realize the ability of on-line data analysis, the data analysing method that described data collector adopts comprises: fft analysis, correlation analysis or power spectrumanalysis.
10. super-high frequency response plasma flow measurement mechanism according to claim 1, is characterized in that, in order to realize that described data collector is realized the quick storage of data by the peripheral hardware USB port to the storage of magnanimity high-frequency data and off-line analysis.
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| CN107894322A (en) * | 2017-09-25 | 2018-04-10 | 西南石油大学 | The experimental provision of fluid pressure ripple transmission speed during a kind of measurement pipeline throttling pressure regulation |
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| CN111263503A (en) * | 2019-12-11 | 2020-06-09 | 厦门大学 | Plasma pneumatic probe and measurement system thereof |
| CN111175010A (en) * | 2020-01-08 | 2020-05-19 | 中国空气动力研究与发展中心超高速空气动力研究所 | Large-caliber hypersonic-velocity low-density wind tunnel flow field display system based on high-frequency glow |
| CN111812354A (en) * | 2020-06-16 | 2020-10-23 | 天津大学 | Flow field velocity measurement system based on high-voltage discharge |
| CN111812354B (en) * | 2020-06-16 | 2021-12-03 | 天津大学 | Flow field velocity measurement system based on high-voltage discharge |
| CN113068294A (en) * | 2021-04-11 | 2021-07-02 | 西北工业大学 | Microsecond oscillation plasma discharge system and discharge method for turbulence drag reduction control |
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| CN114792074A (en) * | 2022-04-25 | 2022-07-26 | 南京航空航天大学 | Method for dividing flow instability influence area |
| CN115230945A (en) * | 2022-09-15 | 2022-10-25 | 中国空气动力研究与发展中心低速空气动力研究所 | Self-adaptive flow separation control method and system for airplane wing and storage medium |
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