Clausen, Sønnik

Evseev, Vadim

Fateev, Alexander

Nielsen, Karsten Lindorff

Online Research Database In Technology

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Downloaded from orbit.dtu.dk on: Dec 20, 2017A multichannel spectroscopic system for simultaneous gas temperaturemeasurements from several lines of sightEvseev, Vadim; Nielsen, Karsten Lindorff; Clausen, Sønnik; Fateev, AlexanderPublication date:2010Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Evseev, V., Nielsen, K. L., Clausen, S., & Fateev, A. (2010). A multichannel spectroscopic system forsimultaneous gas temperature measurements from several lines of sight [Sound/Visual production (digital)].DOPS årsmøde og generalforsamling 2010, Risø, Denmark, 25/11/2010DOPS’ Årsmøde og Generalforsamling 201025. og 26. november 2010Forskningscenter Risø RoskildeA multichannel spectroscopic f i lsystem or s mu taneous gas temperature measurements  from several lines of sightVadim Evseev, Karsten L. Nielsen, Sønnik Clausen, Alexander FateevThe Aim of the WorkMultichannel The exhaust duct of a cylinder(cross-section)SpectrometerT1 = ?T2 = ?T3 = ? To develop a system for simultaneous gas temperature measurements from several lines of sightMAN Diesel & TurboCopenhagen R&D Department To apply the system on an exhaust duct of a large marine Diesel engineOutline Development Validation ApplicationThe System with One ChannelOptical Fibre( Ch l idIR CameraGrating Spectrometer a cogen eIR-Glass Fiber )SourceIR SpectrumIR FrameFrame Rate:up to 100,000 fps512 pixels5Working spectral region: 640 pixels3.8–5 μm(2000–2600 cm-1)Resolving power: 6 nm(4 cm-1)The System with Three ChannelsOptical FibreIR Grating Spectro-meterCameraSlitSource0.04 to 0.1 mmIR FrameFrame Rate:up to 500 fps1.2 mm1.2 mmSimultaneous spectral measurements∅0.76 mmTh i tree s no  a limit!Design Details A special mechanical adaptor for coupling the three fibers togetherThe fibers are glued to theinside of the small holesIR Emission Spectrum] ]Working spectral rangeA typical IR emission spectrum f f(m2·sr·m)(m2·sr·m)COBlackbodyo  a lue gasnce   [W/(nce   [W/(2CO2ral Radianral RadianH OH2OSpectrSpectr2COCxHyH2O2.0 3.0 4.0 5.0Greybody (particles)Wavelength  [μm]Temperature Measurement MethodGas sampleat T [K]λI 0 λI (T) Spectral absorptivity: is the portion of incident energy absorbedat wavelength λ00 )()(λλλλ−=αITIIT The sample also emits radiation:Gas sample N (T) Nλ(T) – spectral radiance   [W/(m2·sr·m)]at T [K] λ Kirchhoff’s law: This relation is a universal function of λ and Tand is independent of a particular sample)()()(TNTTN bλ=λ The Planck function on the right-hand side is given by:)( 51λ= λTCb CTNαλR.H.Tourin, ”Spectroscopic Gas Temperature Measurement”, Elsevier Publishing Company (1966))1( 2 −πλ eValidation[°C]The Reference Temperature Profile*The Measured Value of the Average Temperature is 1705ºCThe Reference Value of the Average Temperature is 1647ºC A flat flame burner with known axisymmetric temperature profile has been used for the validation    The deviation is within 4 %*Hartung et al. Meas. Sci. Technol. 17 (2006) 2485–2493The Marine Diesel EngineMAN Diesel & TurboCopenhagen R&D DepartmentThe Measurement DiagramMultichannel Spectrometer TopMiddleBottomThe exhaust duct of the cylinder(cross-section) λN (T)Gas sampleat T [K] Simultaneous emission measurements   They give spectral radiances NλTop , NλMiddle , NλBottomas functions of time for the top, middle and bottom portsThe Measurement DiagramMultichannel Spectrometer Blackbody (Iλ0)TopMiddleBottomThe exhaust duct of the cylinder(cross-section) Nλ(T)Gas sampleat T [K]λI 0λI (T) Transmission measurements were performed for one port at a time   They are necessary for the calculation of spectral absorptivities αλTop, αλMiddle and αλBottom Th l i h h th t f ll th th te anan ys s as s own a αλ or a  e ree por s can be assumed to be 0.9 The temperatures for each port as functions of time can now be obtained             from the spectral radiances NλTop , NλMiddle , NλBottom and αλ=0.9 using Kirchhoff’s law and the Planck function.Gas Temperature vs TimeTopMiddle Temporal resolution 119 Hz (64 points per stroke) BottomA Stroket [°C]Time  [s]Gas Temperature vs TimeTopMiddle Gas temperature is not homogeneous It is increasing from the bottom to the topBottomStroke period = 0.5376 s(1.9 Hz)Temperature points per stroke = 64(119 Hz)(synchronized with the encoder on the main shaft)t [°C]Time  [s]Towards the tomography of hot gasesTemperature and species concentration distribution in a cross-sectionnel tertichannctrometMultSpecConclusions The three-channel system has been     developed validated  applied on a large scale     The results of the application on the marine Diesel engine: Temperatures as functions of time have been obtained for the three ports            on the exhaust duct The three fibers is not a limit The system is flexible The system can find many other applications      Tomography in Engines An existing technique A group at the University of Manchester headed by Hugh McCann have established the technique of high-speed Chemical Species Tomography, using near-IR absorption spectroscopy The concentration distribution of a target molecule can be imaged at rates up to 4,000 frames per secondwww.manchester.ac.uk/research/H.mccann/researchTowards the tomography of hot gases The 1st step is to validate the methods using the above mentioned lab burner with the known axisymmetric temperature profile The two measurement diagrams are currently under investigation[ ]l kThe radiative transfer equation:dyyxTIyxIyxkyxdI gP anc )),((),(),(),( νννν −−=The author of the diagrams on this slide: V. Sizikov, National Research University of Information Technologies, Mechanics and Optics, Saint Petersburg, Russia

A multichannel spectroscopic system for simultaneous gas temperature measurements from several lines of sight

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A multichannel spectroscopic system for simultaneous gas temperature measurements from several lines of sight

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