Mesures de température dans les écoulements turbulents

Paranthoën, Pierre; Lecordier, Jean-Claude

doi:10.1016/s0035-3159(99)80073-7

Cited by 12 publications

(7 citation statements)

References 42 publications

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“…This method for the temperature field is deduced from the one used by Aronson and Löfdahl [40], for velocity measurements and Rosset et al [34], for temperature measurements. The frequency response of this temperature probe was within the range 4.5-6 kHz depending on the local velocity [41]. The analog signals measured by the single or the two wires probes were recorded during 10-20 s. The signals were digitized at a sampling frequency of 20 kHz and stored on a Nicolet Vision recorder for subsequent processing.…”

Section: Methodsmentioning

confidence: 99%

Mixing in the three-dimensional wake of an experimental modelled vehicle

2011

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Experimental results on tracer gas diffusion within the near wake of a simplified model car (Ahmed model with a rear slant angle of 25 • ) are presented. Pollutant emission is simulated using heated air injected through a small pipe at one side of the model base. Fine cold wire thermometry is used to measure instantaneous temperature excess and variance of temperature gradient in the near wake. Measurements of the three mean velocity components were made using a laser Doppler anemometers system. Characteristics of the mean and fluctuating temperature fields, time-averaged flow streamlines and scalar dissipation measurements are presented and discussed. The local mixing time scale is determined from the measured mean dissipation rate of temperature variance. Its value shows that micromixing is not a limiting phenomenon for chemical reactions in the near wake.

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Section: Methodsmentioning

confidence: 99%

Mixing in the three-dimensional wake of an experimental modelled vehicle

2011

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“…Thermocouple thermometry is often used for the study of temperature fluctuations in turbulent flows [46,47]. The proper design of these sensors and the use of extremely thin wires enable fast response with a relatively good accuracy.…”

Section: Thin-wire Thermocouple Thermometrymentioning

confidence: 99%

“…Thermocouples measure the temperature of the junction based on the Seebeck effect. To measure gas temperature, the heat exchange around the sensor must be modeled [47,53]. Assuming energy conservation on the junction, the gas temperature T g and the junction temperature T j can be correlated.…”

Section: Thin-wire Thermocouple Thermometrymentioning

confidence: 99%

Characterization of the ECN spray A in different facilities. Part 1: boundary conditions characterization

Houidi

Hespel

Bardi

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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The Engine Combustion Network (ECN) community has greatly contributed to improve the fundamental understanding of spray atomization and combustion at conditions relevant to internal combustion engines. In this context, standardized spray experiments have been defined to facilitate the comparison of experimental and simulation studies performed in different facilities and with different models. This operating mode promotes collaborations among research groups and accelerates the advancement of research on spray. In efforts to improve the comparability of the ECN spray A experiments, it is of high importance to review the boundary conditions of different devices used in the community. This work is issued from the collaboration in the ECN France project, where two new experimental facilities from PPRIME (Poitiers) and PRISME (Orleans) institutes are validated to perform spray A experiments. The two facilities, based on Rapid Compression Machine (RCM) design, have been investigated to characterize their boundary conditions (e.g., flow velocity as well as fuel and gas temperatures). A set of standardized spray experiments were performed to compare their results with those obtained in other facilities, in particular the Constant Volume Pre-burn (CVP) vessel at IFPEN. It is noteworthy that it is the first time that RCM type facilities are used in such a way within the ECN. This paper (part 1) focuses on the facilities description and the fine characterization of their boundary conditions. A further paper (part 2) will present the results obtained with the same facilities performing ECN standard spray A characterizations. The reported review of thermocouple thermometry highlights that it is necessary to use thin-wires and bare-bead junction as small as possible. This would help to measure the temperature fluctuations with a minimal need for error corrections, which are highly dependent on the proper estimation of the velocity through the junction, and therefore it may introduce important uncertainties. Temperature heterogeneities are observed in all spray A devices. The standard deviation of the temperature distribution at the time of injection is approximately 5%. We report time-resolved temperature measurement from PPRIME RCM, performed in the near nozzle area during the injection. In inert condition, colder gases from the boundary layer are entrained toward the mixing area of the spray causing a further deviation from the target temperature. This emphasizes the importance of the temperature in the boundary (wall) layer. In reacting condition, the temperature of these entrained gases increases by the effect of the increased pressure, as the RCM has a relatively small volume. Generally, the velocity and turbulence levels are an order of magnitude higher in RCM and constant pressure flow compared to CVP vessels. The boundary characterization presented here will be the base for discussing spray behavior in the part 2 of this paper.

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“…Thus, the temperature measured by the hot junction is less than the temperature of the environment. These losses have been estimated and discussed by many authors (Scadron and Warshawsky [14], Bradly and Matthews [2], Paranthoën and Lecordier [10]). Their estimates by one of the proposed models can correct the difference between the thermocouple temperature and the actual temperature of the gas.…”

Section: Temperature Measurement By Thermocouples In a Reacting Flowmentioning

confidence: 99%

Scalar characteristics of a lean premixed turbulent V-shape flame (air-butane)

Boulahlib¹,

Boukebbab²,

Amara³

et al. 2008

WIT Transactions on Engineering Sciences

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This paper proposes an experimental study of the scalar fields of a lean V shape premixed turbulent flame. The thermometry with the thermocouple numerically compensated was used for determining the thermal fields of a premixed butaneair V shape flame. The structure of both the inert and reactive jet was studied for a Reynolds number of 7000. Turbulence is generated by a perforated grid situated upstream. The main results of the thermal field in the V shape flame have showed more important results and a representative form of the inner structure of the flame was then obtained. The study is to determine how the turbulence and equivalence ratio can affect the temperature field, the flame height, the variable progress and therefore the combustion process.

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Mesures de température dans les écoulements turbulents

Cited by 12 publications

References 42 publications

Mixing in the three-dimensional wake of an experimental modelled vehicle

Mixing in the three-dimensional wake of an experimental modelled vehicle

Characterization of the ECN spray A in different facilities. Part 1: boundary conditions characterization

Scalar characteristics of a lean premixed turbulent V-shape flame (air-butane)

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