Thickness dependent variations in surface phosphor thermometry during transient combustion in an HCCI engine

Knappe, Christoph; Algotsson, Martin; Andersson, Peter; Richter, Mattias; Tunér, Martin; Johansson, Bengt; Aldén, Marcus

doi:10.1016/j.combustflame.2013.02.023

Cited by 32 publications

(15 citation statements)

References 16 publications

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“…In previous studies no temperature gradient could be found for a thickness below 20 µm. [15] Although the operating and boundary conditions of the present study are not identical to those of [15], the inuence of the coating on the heat transfer should not be of importance for the current measurements.…”

Section: Phosphor Thermometrymentioning

confidence: 84%

Wall temperature measurements at elevated pressures and high temperatures in sooting flames in a gas turbine model combustor

et al. 2017

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Wall temperatures were measured with thermographic phosphors on the quartz walls of a model combustor in ethylene/air swirl ames at 3 bar. Three operating conditions were investigated with dierent stoichiometries and with or without additional injection of oxidation air downstream of the primary combustion zone. YAG:Eu and YAG:Dy were used to cover a total temperature range of 10001800 K. Measurements were challenging due to the high thermal background from soot and window degradation at high temperatures. The heat ux through the windows was estimated from the temperature gradient between the in-and outside of the windows. Dierences in temperature and heat ux density proles for the investigated cases can be explained very well with the previously measured dierences in ame temperatures and ame shapes. The heat loss relative to thermal load is quite similar for all investigated ames (1516 %). The results complement previous measurements in these ames to investigate soot formation and oxidation. It is expected, that the data set is a valuable input for numerical simulations of these ames. 1 Introduction Because of the increasingly stringent regulations for particle emissions, i.e. mainly soot, continuing eort is needed for the development and improvement of gas turbines for propulsion and power generation. Soot formation and oxidation in high-pressure turbulent ames are complex processes that are still not completely understood. Numerical simulation is an important tool for the development of gas turbine combustors. However, to evaluate and improve the reliability of numerical predictions, comprehensive experimental data sets are needed from technically-relevant sooting ames under elevated pressures with well-dened boundary conditions. An important parameter in this respect is the temperature of the combustor walls. Due to the lack of accurate measure

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Section: Phosphor Thermometrymentioning

confidence: 84%

Wall temperature measurements at elevated pressures and high temperatures in sooting flames in a gas turbine model combustor

et al. 2017

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“…According to Ref. [23], no thermal gradient across the TP coating was observed with a layer thickness of <20 µm. Therefore in this work, a controlled thickness of 10 to 15 µm was achieved by repeated spray coating (each layer was dried with a heat gun) and was measured with an electromagnetic thickness gauge (Sauter TE 1250-0.1FN).…”

Section: Surface Thermometrymentioning

confidence: 96%

Responses of combustor surface temperature to flame shape transitions in a turbulent bi-stable swirl flame

Yin

Nau

Meier

2017

Experimental Thermal and Fluid Science

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“…The phosphorescence quantum yield q describes the fraction of absorbed photons at wavelength λ 1 that results in the emission of a phosphorescence photon at λ 2 > λ 1 . In terms of mass, the existence of a few micrometer thick phosphor film [24] was neglected in comparison to the much larger substrate mass.…”

Section: Resultsmentioning

confidence: 99%

Development of an automatic routine for calibration of thermographic phosphors

Nada

Knappe

et al. 2014

Meas. Sci. Technol.

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An automated routine for the continuous calibration of thermographic phosphors was developed as a replacement for the conventional calibration scheme that relied on fixed temperature points. The automated calibration routine was validated using Mg 3 F 2 GeO 4 :Mn as a calibration phosphor. Hardware and software aspects of the calibration process were addressed in this development. The hardware aspect included a new substrate design using a high performance alloy, the Hastelloy-C alloy, whereas the software aspect included an automated acquisition system which was capable of acquiring simultaneous thermocouple temperatures and phosphor decay waveform in real time. The design of the calibration process eliminates the need for a system in thermal equilibrium during a phosphor calibration measurement. Temperature ramping rates of up to 4 K min −1 were employed in the oven without a delay in the temperature response being measured between the phosphor and the thermocouples involved. In addition, the automated calibration setup allowed for detailed investigations on the effect of heat being delivered to the phosphor coating by the laser. These findings were confirmed by a simple heat transfer model, based on lumped system analysis. In comparison to the data acquisition performed at several fixed points with the conventional calibration scheme, the experiment duration was shortened by a factor of 4 with the overall accuracy improved by 1-2 K.

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Thickness dependent variations in surface phosphor thermometry during transient combustion in an HCCI engine

Cited by 32 publications

References 16 publications

Wall temperature measurements at elevated pressures and high temperatures in sooting flames in a gas turbine model combustor

Wall temperature measurements at elevated pressures and high temperatures in sooting flames in a gas turbine model combustor

Responses of combustor surface temperature to flame shape transitions in a turbulent bi-stable swirl flame

Development of an automatic routine for calibration of thermographic phosphors

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