A New Model to Describe the Heat Transfer in HCCI Gasoline Engines

Hensel, Sebastian; Sarikoc, Fatih; Schumann, Florian; Kubach, Heiko; Velji, Amin; Spicher, Ulrich

doi:10.4271/2009-01-0129

Cited by 9 publications

(10 citation statements)

References 10 publications

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“…Based on the measured temperature oscillations, the transient heat flux is derived as described in [5,[27][28][29][30]32]. Assuming the temperature field to be of one-dimensional character, the Fourier differential equation for transient temperature fields narrows down to:…”

Section: Methodsmentioning

confidence: 99%

“…Because of thermal insulation of the combustion chamber the gas temperature and hence the ignition timing changes [4]. Hensel et al showed that conventional heat transfer models have to be adapted for HCCI engines because the maximum heat flux occurs at later crank angles than predicted by existing models [5]. Hoffman and Filipi showed in [6] that the limited operational range of low temperature combustion is influenced by near-wall conditions.…”

Section: Combustion Chamber Depositsmentioning

confidence: 99%

“…Hensel [5] developed an approach to describe the heat transfer in homogeneous charge compression ignition engines based upon the work of Hohenberg and Bargende. His modifications include the consideration of air mass flow and intake velocity as well as the formulation of a combustion term generating a reduced rate of temperature change close to the combustion chamber wall after ignition.…”

Section: Wall Heat Transfermentioning

confidence: 99%

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The influence of operating conditions on combustion chamber deposit surface structure, deposit thickness and thermal properties

Weidenlener

Pfeil

Kubach

et al. 2018

Automot. Engine Technol.

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In this work the surface structure of combustion chamber deposits (CCD) on the piston top and the cylinder head is described. By means of an optical profiler the roughness and maximum structure heights are measured. Scanning electron microscope images allow evaluating the structure of the deposits on the surface. The oil influence on CCD formation is assessed using energy-dispersive X-ray spectroscopy to quantify typical oil additives such as Mg, Ca or Zn in the deposits. By means of direct numerical simulation the influence of the CCD structure on near wall flow and hence on convective heat transfer is assessed. With fast surface thermocouples the temperature fluctuation on the cylinder head is measured. Applying two different model approaches-Hopwood and two-layer-model-the CCD layer thickness is calculated. By correlating the results with layer thickness measurements by the above mentioned optical profiler the values of the thermal conductivity for the CCD layers are calculated.

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Section: Methodsmentioning

confidence: 99%

Section: Combustion Chamber Depositsmentioning

confidence: 99%

Section: Wall Heat Transfermentioning

confidence: 99%

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The influence of operating conditions on combustion chamber deposit surface structure, deposit thickness and thermal properties

Weidenlener

Pfeil

Kubach

et al. 2018

Automot. Engine Technol.

Self Cite

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“…Such is the case with the Chang et al [24] model, where a 1/6 reduction factor on the flame enhancement term and a different temperature coefficient were proposed based on experimental heat flux studies in an HCCI engine. Other modified correlations have also been developed for HCCI combustion [24,[31][32][33].…”

Section: Heat Transfer Model For Multi-mode Combustionmentioning

confidence: 99%

“…These and other global heat transfer correlations have been the subject of numerous studies investigating their applicability to different combustion modes [24,[31][32][33][34][35][36][37][38][39][40][41]. Multi-mode SACI combustion, however, has yet to be the subject of an in-depth heat transfer investigation.…”

Section: Heat Transfer Model For Multi-mode Combustionmentioning

confidence: 99%