Combined PIV and DGV applied to a pressurized gas turbine combustion facility

Willert, Christian; Hassa, Christoph; Stockhausen, Guido; Jarius, Marc; Voges, Melanie; Klinner, Joachim

doi:10.1088/0957-0233/17/7/005

Cited by 33 publications

(11 citation statements)

References 10 publications

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“…Simultaneous planar (2-D) measurements of all three velocity components with a single camera were performed using a hybrid DGV and PIV image processing for the same data set (Willert et al, 2006;Wernet, 2004). Using such systems, measurement rates in the lower Hz range could be achieved.…”

Section: State Of the Artmentioning

confidence: 99%

High-speed camera-based measurement system for aeroacoustic investigations

Gürtler

Haufe

Schulz

et al. 2016

J. Sens. Sens. Syst.

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Abstract. The interaction of sound and flow enables an efficient noise damping. Inevitable for understanding of this aeroacoustic damping phenomenon is the simultaneous measurement of flow and sound fields. Optical sensor systems have the advantage of non-contact measurements. The necessary simultaneous determination of sound levels and flow velocities with high dynamic range has major hurdles. We present an approach based on frequency-modulated Doppler global velocimetry, where a high-speed CMOS camera with data rates over 160 MSamples s −1 of velocity samples is employed. Using the proposed system, two-component flow velocity measurements are performed in a three-dimensional region of interest with a spatial resolution of 224 µm, based on single-pixel evaluation, and a measurement rate of 10 kHz. The sensor system can simultaneously capture sound and turbulent flow velocity oscillations down to a minimal power density of 40.5 (mm s −1 ) 2 Hz −1 in a frequency range up to 5 kHz. The presented measurements of the interaction of sound and flow support the hypothesis that the sound energy is transferred into flow energy.

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Section: State Of the Artmentioning

confidence: 99%

High-speed camera-based measurement system for aeroacoustic investigations

Gürtler

Haufe

Schulz

et al. 2016

J. Sens. Sens. Syst.

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“…In some research groups, high-pressure test rigs have been equipped with optical access in order to apply these techniques to GT combustion processes under realistic conditions, i.e. preheated air, high thermal loads, high turbulence levels and relevant combustor geometries, see for example [15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

PIV, 2D-LIF and 1D-Raman measurements of flow field, composition and temperature in premixed gas turbine flames

Stopper

Aigner

et al. 2010

Experimental Thermal and Fluid Science

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a b s t r a c tSeveral laser diagnostic measurement techniques have been applied to study the lean premixed natural gas/air flames of an industrial swirl burner. This was made possible by equipping the burner with an optical combustion chamber that was installed in the high-pressure test rig facility at the DLR Institute of Combustion Technology in Stuttgart. The burner was operated with preheated air at various operating conditions with pressures up to p = 6 bar and a maximum thermal power of P = 1 MW.The instantaneous planar flow field inside the combustor was studied with particle image velocimetry (PIV). Planar laser induced fluorescence (PLIF) of OH radicals on a single-shot basis was used to determine the shape and the location of the flame front as well as the spatial distribution of reaction products. 1D laser Raman spectroscopy was successfully applied for the measurement of the temperature and the concentration of major species under realistic gas turbine conditions.Results of the flow field analysis show the shape and the size of the main flow regimes: the inflow region, the inner and the outer recirculation zone. The highly turbulent flow field of the inner shear layer is found to be dominated by small and medium sized vortices. High RMS fluctuations of the flow velocity in the exhaust gas indicate the existence of a rotating exhaust gas swirl. From the PLIF images it is seen that the primary reactions happened in the shear layers between inflow and the recirculation zones and that the appearance of the reaction zones changed with flame parameters. The results of the multiscalar Raman measurements show a strong variation of the local mixture fraction allowing conclusions to be drawn about the premix quality. Furthermore, mixing effects of unburnt fuel and air with fully reacted combustion products are studied giving insights into the processes of the turbulence-chemistry interaction.

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“…Various optical principles exist, which enable contactless and fast flow velocity measurements. Even hybrid optical measurement methods are known and were, for example, proposed by Grosjean et al (1997), Förster et al (2000), Wernet (2004) and Willert et al (2006). However, regarding the capabilities of the different optical measurement methods, the majority of the studies (aside from some exceptions such as Willert et al 2005;Thacker et al 2010) deal only with a single measurement approach.…”

Section: Motivationmentioning

confidence: 99%

Fundamental flow measurement capabilities of optical Doppler and time-of-flight principles

Fischer

2021

Exp Fluids

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In order to understand the fundamental measurement capabilities of different flow velocity measurement principles based on Mie scattering, a fundamental equation of how to calculate the shot noise limit for a respective signal model is derived. The derivation is based on the well-known rules of uncertainty propagation and yields the Cramér–Rao bound without the necessity to calculate the Fisher information. The derived equation is next applied to compare the shot noise limit for Doppler and time-of-flight principles including laser Doppler anemometry (LDA), planar Doppler velocimetry (PDV), laser-two-focus velocimetry (L2F), particle tracking velocimetry (PTV) and particle image velocimetry (PIV). The comparison is performed for an identical mean laser power, while two cases are studied in detail: measuring on a single seeding particle as well as measuring on multiple seeding particles and averaging. LDA, L2F and PTV/PIV obey a similar shot noise limit. For the case of a measurement on multiple seeding particles, the minimal achievable measurement uncertainty is directly proportional to the absolute value of the measured velocity component and inversely proportional to the spatial resolution. The respective shot noise limit for PDV is almost independent of the measured flow velocity component and the spatial resolution. Since PDV is sensitive with respect to a different flow velocity component depending on the observation direction, a comparison with the other principles is only reasonable to a certain extent. However, all shot noise limits in case of measuring on multiple seeding particles show the expected inverse proportionality to the square root of the total number of detected photons and thus also to the square root of the measurement time. Considering a comparable spatiotemporal resolution, an identical mean light power and typical measurement configurations, the PDV shot noise limit is the largest. As a final result, it is derived that each measurement principle obeys an uncertainty principle between position and the respective component of the wave vector, which is in agreement with Heisenberg’s uncertainty principle. Therefore, a common basis is provided to assess the fundamental measurement capabilities of Doppler and time-of-flight measurement systems on the basis of what is possible within the quantum mechanical constraints. Graphic abstract

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Combined PIV and DGV applied to a pressurized gas turbine combustion facility

Cited by 33 publications

References 10 publications

High-speed camera-based measurement system for aeroacoustic investigations

High-speed camera-based measurement system for aeroacoustic investigations

PIV, 2D-LIF and 1D-Raman measurements of flow field, composition and temperature in premixed gas turbine flames

Fundamental flow measurement capabilities of optical Doppler and time-of-flight principles

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