Correlation between Piston Surface Temperature and Piston Material and their Influence on Spray-Wall-Interaction and Spray Combustion

Weiß, Lukas; Wensing, Michael

doi:10.1299/jmsesdm.2017.9.a209

Cited by 1 publication

(2 citation statements)

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“…The expected peak heat load at the wall is of great interest for the deduction of material stress and material damage mechanisms. 6 In addition, the local resolution of peak heat fluxes is of importance for the investigation of cooling, hot-spot phenomena and locally occurring overload scenarios. 32 A closer look at the highest point at 6000 rpm reveals, that the heat flux density is lower than the regression predicts for both load conditions.…”

Section: Comparison With Literature and Regression Analysismentioning

confidence: 99%

“…In order to investigate heat transfer and fluid-structures interactions in combustion engines, there is a strong demand for highly time-resolved heat flux measurements at the surface. Current phenomena that demand local, time resolved heat transfer measurements are for example, the formation of pollution and soot due to flame quenching in wall-near regions, [1][2][3][4] the run up 5 and piston damage mechanisms 6 of internal combustion engines and heat transfer augmentation of engine parts due to higher effective mean pressures and the utilization of fuels like hydrogen. 7 Typically, wall-mounted coaxial or thin film thermocouples [8][9][10][11][12][13][14][15] are used for surface temperature determination and are converted into heat flux data via numerical procedures like the Cook-Feldermann Algorithm 16 or via the surface temperature method proposed by Eichelberg.…”

Section: Introductionmentioning

confidence: 99%

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Highly time-resolved heat flux measurement in a combustion engine

Huber

Gackstatter

Rödiger

et al. 2022

International Journal of Engine Research

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In this study a fast-response Atomic Layer Thermopile (ALTP) based heat flux measurement system is used for wall heat-flux determination in the combustion chamber of a commercially available SI-gasoline combustion engine. The ALTP system provides further process variables that supplement conventional cylinder pressure data with data that are highly resolved in time and location. The newly developed sensor modules were precisely calibrated and compared with other measurement techniques with radiation- and convection-based procedures. Quantitative highly time-resolved measurements with frequency resolutions up to 1 MHz are performed in the engine from low to full load and up to full speeds. Single-cycle and cycle-to-cycle measurements display the quality and high temporal resolution of the measurement system. The comparison of pressure and the heat-flux measurements shows the benefits of ALTPs for detection of engine, combustion and flow characteristics. The time progression of the heat flux curves and their autocorrelated signals show only minor noise interference. The measured results display significantly higher local peak heat flux densities with values up to 1250 Wcm−2 for certain measurement points and engine conditions than reported previously in literature for SI engines. A regression analysis suggests that the high peak heat flux densities obtained are caused by the significant higher engine power-levels per cylinder. The measured data compare well with regressions extrapolated from reported literature data. A provided uncertainty analysis revealed significant influencing parameters. The variation of thermal wall parameters with 20%–30% uncertainty are playing an essential role in particular.

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Section: Comparison With Literature and Regression Analysismentioning

confidence: 99%