Comparison of heat losses at the impingement point and in between two impingement points in a diesel engine using phosphor thermometry

Binder, Christian; Matamis, Alexios; Richter, Mattias; Norling, Daniel

doi:10.4271/2019-01-2185

Cited by 2 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Fea Temperature Field Solutionsmentioning

confidence: 75%

“…For the full load case depicted in Figure 4, the CFD predicts that peak heat fluxes at certain locations can approach 40 MW/m 2 during peak combustion impingement on the piston. While these values do exceed the typical estimated range for a 1D correlation, such as Hohenberg [26] or Woschni [27], which are averaged over the entire combustion chamber surface area, experimental results by Binder et al [28] using phosphor thermometry demonstrated that the location under impinging burning jets can experience heat flux exceeding 60 MW/m 2 . The extreme magnitude of the local heat fluxes on the surface of the low-thermal conductivity, low-heat capacity coating led to instantaneous surface temperatures exceeding 1100 K. The amplitude of the intracycle temperature swing exceeded 600K.…”

Section: Fea Temperature Field Solutionsmentioning

confidence: 76%

See 1 more Smart Citation

CFD/FEA Co-Simulation Framework for Analysis of the Thermal Barrier Coating Design and Its Impact on the HD Diesel Engine Performance

et al. 2021

View full text Add to dashboard Cite

Thermal barrier coatings (TBCs) have been investigated both experimentally and through simulation for mixing controlled combustion (MCC) concepts as a method for reducing heat transfer losses and increasing cycle efficiency, but it is still a very active research area. Early studies were inconclusive, with different groups discovering obstacles to realizing the theoretical potential. Nuanced papers have shown that coating material properties, thickness, microstructure, and surface morphology/roughness all can impact the efficacy of the thermal barrier coating and must be accounted for. Adding to the complexities, a strong spatial and temporal heat flux inhomogeneity exists for mixing controlled combustion (diesel) imposed onto the surfaces from the impinging flame jets. In support of the United States Department of Energy SuperTruck II program goal to achieve 55% brake thermal efficiency on a heavy-duty diesel engines, this study sought to develop a deeper insight into the inhomogeneous heat flux from mixing controlled combustion on thermal barrier coatings and to infer concrete guidance for designing coatings. To that end, a co-simulation approach was developed that couples high-fidelity computational fluid dynamics (CFD) modeling of in-cylinder processes and combustion, and finite element analysis (FEA) modeling of the thermal barrier-coated and metal engine components to resolve spatial and temporal thermal boundary conditions. The models interface at the surface of the combustion chamber; FEA modeling predicts the spatially resolved surface temperature profile, while CFD develops insights into the effect of the thermal barrier coating on the combustion process and the boundary conditions on the gas side. The paper demonstrates the capability of the framework to estimate cycle impacts of the temperature swing at the surface, as well as identify critical locations on the piston/thermal barrier coating that exhibit the highest charge temperature and highest heat fluxes. In addition, the FEA results include predictions of thermal stresses, thus enabling insight into factors affecting coating durability. An example of the capability of the framework is provided to illustrate its use for investigating novel coatings and provide deeper insights to guide future coating design.

show abstract

Section: Fea Temperature Field Solutionsmentioning

confidence: 75%

Section: Fea Temperature Field Solutionsmentioning

confidence: 76%

CFD/FEA Co-Simulation Framework for Analysis of the Thermal Barrier Coating Design and Its Impact on the HD Diesel Engine Performance

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Imaging techniques such as laser-induced phosphorescence [11][12][13] or infrared photography 14,15 have been applied to investigate engine heat transfer. These techniques can detect two-dimensional temperature distributions with good spatial resolution, so they are advantageous in understanding the overall heat transfer situation.…”

Section: Introductionmentioning

confidence: 99%

Application of a MEMS heat flux sensor to heat transfer research on an impinging diesel jet

Dejima

Nakabeppu

Moussou

et al. 2021

International Journal of Engine Research

View full text Add to dashboard Cite

To clarify the mechanisms of heat transfer on an engine wall is an important challenge because the heat loss on the wall is one of the dominant factors that limit the thermal efficiency. A thin-film resistance type heat flux sensor fabricated with Micro-Electro-Mechanical Systems (MEMS) technologies was applied to research on the heat transfer of an impinging diesel jet. The MEMS sensor had a high sensitivity and multiple measurement points with a scale comparable to the turbulence of in-cylinder flow for the investigation of local instantaneous heat transfer characteristics in engines. Measurements of wall temperature and heat flux were conducted in a constant volume chamber under the reference conditions of Engine Combustion Network (ENC) Spray A with variations in injection pressure. As a result, the maximum heat flux and heat transfer coefficient reached about 5 MW/m2 and 3 MW/(m2 K), respectively. The results were compared to those obtained with a commercially available thermocouple, and both sensors produced similar trends. In addition, fluid motion near the wall was estimated from the heat flux fluctuations using a cross-correlation analysis. The relationship between heat transfer and flow was investigated in a dimensionless number fashion, and it was compared to a semi-theoretical prediction that was based on a steady state laminar flow heat transfer model.

show abstract

Comparison of heat losses at the impingement point and in between two impingement points in a diesel engine using phosphor thermometry

Cited by 2 publications

References 20 publications

CFD/FEA Co-Simulation Framework for Analysis of the Thermal Barrier Coating Design and Its Impact on the HD Diesel Engine Performance

CFD/FEA Co-Simulation Framework for Analysis of the Thermal Barrier Coating Design and Its Impact on the HD Diesel Engine Performance

Application of a MEMS heat flux sensor to heat transfer research on an impinging diesel jet

Contact Info

Product

Resources

About