CN103983581A - Method for measuring gas-solid jet flow field by combination of terahertz wave and infrared optical wave and device thereof - Google Patents
Method for measuring gas-solid jet flow field by combination of terahertz wave and infrared optical wave and device thereof Download PDFInfo
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Abstract
The invention discloses a method for measuring gas-solid jet flow fields by combination of terahertz wave and infrared optical wave and a device thereof. By combination of terahertz imaging and infrared optical wave thermal imaging methods, the whole gas-solid jet flow field is measured. Terahertz wave is rectified to parallel rays and penetrates the gas-solid jet flow field; terahertz spectrum attenuated by the flow field is analyzed; by comparison of the terahertz spectrum with known gas composition, gas-phase field distribution information of the measured gas-solid flow field is obtained; solid particles are heated to a certain temperature and enters the measured flow field area with the gas-phase jet flow; the solid particles distributed in the flow field emit infrared optical waves all around; motion trajectory and distribution information of the solid particles are captured by an infrared thermal imaging technology; and gas-solid jet flow field information are simultaneously obtained at real time by combination of two imaging methods, namely the terahertz imaging and infrared optical wave thermal imaging methods. The invention provides a new method for simultaneously measuring gas-solid flow fields. The method has advantages of good system stability, high feasibility and high measurement accuracy.
Description
Technical field
The present invention relates to a kind of THz wave and infrared waves coupling and measure the method and apparatus of solid jet flow field, belong to multiphase flow measurement technology.
Background technology
Gas-solid dual-phase jet is a kind of type of flow of generally applying in design library part editor and reuse, in general industry: generating plant pulverized coal boiler coal dust jet combustion; In space industry: the jet of rocket burning ejection.Thereby how can smooth combustion, augmentation of heat transfer efficient burning, although had some experimental formula and designs at present, this mobile mechanism is still not very clear.Therefore along with scientific and technological development, the renewal of equipment, the research to gas-solid dual-phase jet and related experiment measuring technology have obtained very large attention and development.
Since the eighties in 20th century, numerous scholars seek the method in non-cpntact measurement flow field, and the non-cpntact measurement means such as LDV, improved LDV, PDA, PIV of having invented are studied the rule of two-phase flow fields directly or indirectly.LDV, PDA are spot measurement methods, and particle imaging knotmeter (PIV) is the new leap of experimental fluid mechanics measurement means, and it has broken through the restriction of traditional spot measurement, is current state-of-the-art whole audience quantitative measurment means.For single-phase measurement, current measurement means development reaches its maturity, but still has larger error.PIV need to add the tracer grain that particle diameter is very little and indirectly replace gas phase field in the time measuring gas phase, and this error own is just very large, and in the time only measuring Particle Phase, PIV can directly measure the speed of tracer grain, and error is less, and development is comparatively ripe.But PIV is in the time measuring Two-Phase Flow Field, need to add two kinds of tracer grains simultaneously, a kind of replacement gas phase field one is Particle Phase, this measuring method not only granule is the motion of indirect reaction gas phase field, ignore the collision between two kinds of particles simultaneously, and brought a lot of troubles to later stage pictorial information processing.
Up to the present, also do not have comparatively advanced measuring method can measure Dual-Phrase Distribution of Gas olid field simultaneously, and realize the not measurement of interference flowing field.THz wave, due to its special frequency range, therefore has stronger penetrability and good directionality, and temperature difference can be accurately located, be differentiated quantitatively, qualitatively in infrared waves thermal imaging is the different objects of 0.05 DEG C.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of THz wave and infrared waves coupling and measure the method and apparatus of solid jet flow field, limitation, the PIV measuring method that can only measure solid phase field for solving general measuring method characterizes gas phase field with tracer grain flow behavior and cannot ignore the problems such as the collision impact of gas phase tracer grain on solid phase particles while unavoidably causing that error, modified PIV measuring method are measured gas-solid field at the same time.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
A method for solid jet flow field is measured in THz wave and infrared waves coupling, combines and uses terahertz imaging and two kinds of methods of infrared waves thermal imaging to carry out measurement of full field to gas-solid dual-phase jet flow field, specifically comprises the steps:
(1) THz wave is rectified into parallel rays vertical sweep gas fixed double phase flow field, analyzes the Terahertz wave spectrum after the decay of flow field, by the Terahertz wave spectrum of comparison known gas composition, obtain the gas phase field distribution information of tested gas-solid flow field;
(2) heat solid phase particles to uniform temperature, and enter tested flow field regions with gas jet, the solid phase particles being distributed in flow field is launched infrared waves to surrounding, adopts infrared thermal imaging technique to catch movement locus and the distributed intelligence of solid phase particles;
(3) combine and use THz wave imaging and two kinds of formation methods of infrared waves thermal imaging simultaneously and Real-time Obtaining gas-solid dual-phase jet field information.
The device of solid jet flow field is measured in a kind of THz wave and infrared waves coupling, comprise THz wave measuring system, infrared waves measuring system and flow-field test district, the THz wave of described THz wave measuring system vertically penetrates test section, flow field after being rectified into parallel rays, and the solid phase particles in described infrared waves measuring system stream field test section catches to the infrared waves of surrounding transmitting.
A kind of concrete scheme is:
Described flow-field test district comprises jet nozzle and flow-field test space, and described jet nozzle is arranged on the central upper portion axis in flow-field test space, the particle gas-solid mixture to flow-field test space inner direct gas and after heating;
Described THz wave measuring system comprises laser pulse transmitter, terahertz radiation source, emitting side level crossing, pantograph, receiver side level crossing, pantograph, THz wave crystal detection, time-domain spectroscopy instrument composition Shang Xia second Shang Xia first, laser pulse transmitter, terahertz radiation source, emitting side level crossing and the first upper and lower pantograph are arranged in a side in flow-field test space, and receiver side level crossing, Shang Xia second, pantograph and THz wave crystal detection are arranged in the opposite side in flow-field test space; Described emitting side level crossing is placed in Shang Xia first on pantograph, and receiver side level crossing is placed in Shang Xia second on pantograph; The laser excitation terahertz radiation source that laser pulse transmitter sends, the directional light producing vertically penetrates the flow field test space after emitting side flat mirror reflects, after receiver side flat mirror reflects, received by THz wave crystal detection again, the reception flashlight analysis of spectrum of time-domain spectroscopy instrument to THz wave crystal detection, sends to server by information after analysis;
Described infrared waves measuring system comprises the infrared thermoviewer being connected with server, and microlens is set in infrared thermoviewer; Described infrared thermoviewer is arranged on the side in flow-field test space, directly catches the infrared waves that the solid phase particles in flow-field test space is launched to surrounding, regulates microlens to catch the infrared waves of local particle transmitting.
In said apparatus, regulate pantograph and the second upper and lower pantograph Shang Xia first simultaneously, to maintain emitting side level crossing and receiver side level crossing at adaptation height, can change measured height.
Beneficial effect: the method and apparatus of solid jet flow field is measured in THz wave provided by the invention and infrared waves coupling, and with respect to prior art, tool has the following advantages: 1, break through spot measurement in the past, can be to the measurement of full field of Dual-Phrase Distribution of Gas olid field; 2, the present invention uses THz wave imaging and infrared waves imaging are all methods of stream field nondestructive measurement, improve measuring accuracy, directly gas-solid dual-phase jet flow field is measured, do not needed to use the destruction flow fields such as probe, also need in flow field, not add trace particle; 3, the THz wave that the present invention uses has strong penetrability and good directionality, due to its special frequency range, is difficult for diffraction and refraction occur, and measurement result is more accurate; 4, the infrared thermal imager that the present invention uses can accurately locate, qualitative, measure the temperature difference at the different objects of 0.05 DEG C quantitatively, improved the accuracy in the particle field flow field catching; 5, the present invention utilizes THz wave imaging measurement gas phase field, utilizes infra-red thermal imaging to measure solid phase field, and both intercouple, and have obtained the information in gas-solid dual-phase jet flow field simultaneously; 6, the present invention uses one group of terahertz radiation source and THz wave crystal detection, has expanded measurement range, realizes the measurement to whole cross section, has improved measuring speed simultaneously; 7, the present invention uses the level crossing that two fans can upper and lower translation, by regulate first, second upper and lower pantograph simultaneously, regulates the height of both sides level crossing, always realizes the information of flow of measuring flow field different cross section, has realized real measurement of full field; 8, the present invention adds microlens in infrared thermography, by regulating microlens, can selectivity catch local granule motion.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Be illustrated in figure 1 a kind of THz wave and infrared waves coupling and measure the device of solid jet flow field, comprise THz wave measuring system, infrared waves measuring system and flow-field test district, the THz wave of described THz wave measuring system vertically penetrates test section, flow field after being rectified into parallel rays, and the solid phase particles in described infrared waves measuring system stream field test section catches to the infrared waves of surrounding transmitting.Concrete structure is as follows.
Described flow-field test district comprises jet nozzle 5 and flow-field test space 6, and described jet nozzle 5 is arranged on the central upper portion axis in flow-field test space 6, the particle gas-solid mixture to flow-field test space 6 inner direct gases and after heating;
Described THz wave measuring system comprises laser pulse transmitter 1, terahertz radiation source 2, emitting side level crossing 3, pantograph 4, receiver side level crossing 8 Shang Xia first, Shang Xia second, pantograph 9, THz wave crystal detection 10, time-domain spectroscopy instrument 11 form, laser pulse transmitter 1, terahertz radiation source 2, emitting side level crossing 3 and the first upper and lower pantograph 4 are arranged in a side in flow-field test space 6, and receiver side level crossing 8, Shang Xia second, pantograph 9 and THz wave crystal detection 10 are arranged in the opposite side in flow-field test space 6; Described emitting side level crossing 3 is placed in Shang Xia first on pantograph 4, and receiver side level crossing 8 is placed in Shang Xia second on pantograph 9; The laser excitation terahertz radiation source 2 that laser pulse transmitter 1 sends, the directional light producing vertically penetrates the flow field test space 6 after 3 reflections of emitting side level crossing, after 8 reflections of receiver side level crossing, received by THz wave crystal detection 10 again, the reception flashlight analysis of spectrum of time-domain spectroscopy instrument 11 to THz wave crystal detection 10, sends to server 12 by information after analysis;
Described infrared waves measuring system comprises the infrared thermoviewer 7 being connected with server 12, and microlens is set in infrared thermoviewer; Described infrared thermoviewer 7 is arranged on the side in flow-field test space 6, directly catches the infrared waves that the solid phase particles in flow-field test space 6 is launched to surrounding, regulates microlens to catch the infrared waves of local particle transmitting.
Flow-field test district is made up of gas-solid dual-phase jet nozzle 5 and flow-field test space 6, wherein, jet nozzle 5 is arranged in the top in flow-field test space 6, the potpourri of the particle in jet nozzle 5 by survey gas and after heating, and add particle volume fraction below per mille, the solid jet flow of formation is dilute phase solid jet flow.
THz wave measuring system is used for gas phase field, gas-solid dual-phase jet flow field to measure, when the generation of THz wave, adopt the mode of photon excitation, laser pulse transmitter 1 is launched laser pulse and is encouraged one group of terahertz radiation source 2, after rectification, form one group of parallel THz wave, THz wave penetrates test section, flow field 6 through the one group of THz wave that is parallel to flow field xsect that reflects to form of emitting side level crossing 3, THz wave transmitted through flow-field test district 6 is received by one group of THz wave crystal detection 10 through the reflection of receiver side level crossing 8 again, the information exchange that THz wave crystal detection 10 receives is crossed after time domain spectrometer 11 (THz wave time-domain spectroscopy analyser 11) is processed and is stored in server 12.Move up and down two 4 and 9 of upper and lower pantographs and can realize moving up and down of this group THz wave, thereby measure the information of flow on flow-field test district 6 different cross sections.
Heating solid phase particles is to uniform temperature, and enter tested flow field regions with gas jet, the solid phase particles being distributed in flow field is launched infrared waves to surrounding, infrared waves measuring system directly adopts infrared thermal imager 7 to take gas-solid dual-phase jet field, regulate the microlens in thermal infrared imager 7, catch local movement of particles, the information of the captured Particle Phase of infrared thermography is also stored in server 12.
The device of solid jet flow field is measured in THz wave based on above-mentioned and infrared waves coupling, and the method concrete grammar that carries out THz wave and infrared waves coupling measurement solid jet flow field is as follows:
First open laser pulse transmitter 1, THz wave time-domain spectroscopy analyser 11, infrared thermoviewer 7 and server 12.What now both measured is the information that there is no the space of gas-solid dual-phase jet field.
The required particle of test experiments in this example, taking the beaded glass of 200 μ m as example, beaded glass is housed in particle heating tank, particle is dried and is heated a period of time, make particle temperature reach 80 DEG C, though particle temperature Temperature Distribution after heating is slightly uneven all higher than the temperature of gas in testing.Gas flow is 22m
3/ h, nozzle diameter is 20mm, the density of the beaded glass of 0.1%, the 200 μ m that interpolation grain volume fraction is tolerance is 2000kg/m
3, the granular mass flow adding is 44kg/h.Controlling particle continuous uniform mixes with gas.Now the velocity of discharge of nozzle 5 is about 20m/s.
After gas-solid dual-phase jet is stable, regulate Shang Xia first pantograph 4 and the second upper and lower pantograph 9 in the position of 0.5D (nozzle diameter) simultaneously, laser pulse transmitter 1 is launched laser pulse and is encouraged one group of terahertz radiation source 2, form one group of parallel THz wave, THz wave penetrates test section, flow field 6 through the one group of THz wave that is parallel to flow field xsect that reflects to form of emitting side level crossing 3, THz wave transmitted through flow-field test district is received by one group of THz wave crystal detection 10 through the reflection of receiver side level crossing 8 again, the information exchange that crystal detection is accepted is crossed after THz wave time-domain analysis instrument 11 is processed and is stored in server 12.Infrared waves measuring system directly adopts infrared thermal imager 7 to take gas-solid dual-phase jet field simultaneously.The information of the captured Particle Phase of infrared thermography is also stored in server 12.Now in server 12, store the information of the gas-solid two-phase of jet.Regulate upper and lower pantograph 4 and upper and lower pantograph 9 at various height according to requirement of experiment, taking 1D, 2.5D, 5D, 10D, 15D, 20D as example, use the same method and measure the information of this metastable Dual-Phrase Distribution of Gas olid field.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. a method for solid jet flow field is measured in THz wave and infrared waves coupling, it is characterized in that: combine and use terahertz imaging and two kinds of methods of infrared waves thermal imaging to carry out measurement of full field to gas-solid dual-phase jet flow field, specifically comprise the steps:
(1) THz wave is rectified into parallel rays vertical sweep gas fixed double phase flow field, analyzes the Terahertz wave spectrum after the decay of flow field, by the Terahertz wave spectrum of comparison known gas composition, obtain the gas phase field distribution information of tested gas-solid flow field;
(2) heat solid phase particles to uniform temperature, and enter tested flow field regions with gas jet, the solid phase particles being distributed in flow field is launched infrared waves to surrounding, adopts infrared thermal imaging technique to catch movement locus and the distributed intelligence of solid phase particles;
(3) combine and use THz wave imaging and two kinds of formation methods of infrared waves thermal imaging simultaneously and Real-time Obtaining gas-solid dual-phase jet field information.
2. the device of solid jet flow field is measured in a THz wave and infrared waves coupling, it is characterized in that: comprise THz wave measuring system, infrared waves measuring system and flow-field test district, the THz wave of described THz wave measuring system vertically penetrates test section, flow field after being rectified into parallel rays, and the solid phase particles in described infrared waves measuring system stream field test section catches to the infrared waves of surrounding transmitting.
3. the device of solid jet flow field is measured in THz wave according to claim 2 and infrared waves coupling, it is characterized in that:
Described flow-field test district comprises jet nozzle (5) and flow-field test space (6), described jet nozzle (5) is arranged on the central upper portion axis in flow-field test space (6), the particle gas-solid mixture to flow-field test space (6) inner direct gas and after heating;
Described THz wave measuring system comprises laser pulse transmitter (1), terahertz radiation source (2), emitting side level crossing (3), pantograph Shang Xia first (4), receiver side level crossing (8), pantograph Shang Xia second (9), THz wave crystal detection (10), time-domain spectroscopy instrument (11) composition, laser pulse transmitter (1), terahertz radiation source (2), emitting side level crossing (3) and the first upper and lower pantograph (4) are arranged in a side in flow-field test space (6), receiver side level crossing (8), pantograph Shang Xia second (9) and THz wave crystal detection (10) are arranged in the opposite side of flow-field test space (6), it is upper that described emitting side level crossing (3) is placed in pantograph Shang Xia first (4), and receiver side level crossing (8) is placed on pantograph Shang Xia second (9), the laser excitation terahertz radiation source (2) that laser pulse transmitter (1) sends, the directional light producing vertically penetrates the flow field test space (6) after emitting side level crossing (3) reflection, after receiver side level crossing (8) reflection, received by THz wave crystal detection (10) again, the reception flashlight analysis of spectrum of time-domain spectroscopy instrument (11) to THz wave crystal detection (10), sends to server (12) by information after analysis,
Described infrared waves measuring system comprises the infrared thermoviewer (7) being connected with server (12), and microlens is set in infrared thermoviewer; Described infrared thermoviewer (7) is arranged on the side of flow-field test space (6), directly catch the infrared waves that the solid phase particles in flow-field test space (6) is launched to surrounding, regulate microlens to catch the infrared waves of local particle transmitting.
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