A complete 0D thermodynamic predictive model for direct injection diesel engines

“…Each curve represents the average and the standard deviation of 100 cycles recorded. a particular sub-model included in CALMEC [26] which has been calibrated to the injector and nozzle used in the present research. Thus, the end of injection for each test is marked with a vertical straight line.…”

Section: Operating Conditionsmentioning

confidence: 99%

“…The combustion analysis was performed with a single zone model named CALMEC, which is fully described in [26].This combustion diagnosis tool uses the in-cylinder pressure signal as its main input. The in-cylinder pressure was measured with its corresponding pressure transducer coupled with a charge amplifier for each engine.…”

Section: In-cylinder Pressure Signal Analysismentioning

confidence: 99%

“…Along with these two basic equations, several sub-models: a filling and emptying model was used to calculate the trapped mass [27]; the specific heat of the gas depends on both temperature and composition [28]; blow-by model was based on the evolution of the gas in an isentropic nozzle [26]; the chamber volume deformation due to pressure and inertia was calculated by means of a simple deformation model [29];the heat transfer coefficient in the chamber walls was calculated with a modified Woschnilike model [30]:…”

Section: In-cylinder Pressure Signal Analysismentioning

confidence: 99%

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In-cylinder soot radiation heat transfer in direct-injection diesel engines

Benajes

Martín

García

et al. 2015

Energy Conversion and Management

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HIGHLIGHTSOptoelectronic pyrometer provides similar results compared with a conventional method Lower injection pressure results in higher radiation Higher ambient temperature and higher in-cylinder gas density produce higher radiation Larger lift-off length reduces the soot volume fraction and the spectral intensity An increase on swirl number, load and CA50 provide a lower total radiation Lower values of EGR implies a decreased on radiation intensity KEYWORDSSoot; in-cylinder heat transfer; radiation; Optical pyrometer; ABSTRACTThe efficiency and CO 2 are one of the main concerns of automotive manufacturers.There are several strategies under investigation to solve this problem. In the present work, the research effort has been focused on improving knowledge of in-cylinder heat transfer and its impact on engine efficiency. In particular, soot radiation was studied since it can be considered a significant source of the efficiency losses in modern diesel engines. Considering previous studies, the portion of total chemical energy released during combustion lost due to radiation heat transfer varies widely from 0.5 up to 10%, depending on engine parameters and combustion process. Thus, the main objective of this work was to evaluate the amount of energy lost to soot radiation relative to the input fuel chemical energy during the combustion event under different operating conditions in a completely controlled environment provided by an optical engine. Under these simplified conditions, two-color method was applied by using high speed imaging pyrometer with cameras (two dimensional results) and optoelectronic pyrometer (zero dimensional results). Once a detailed comparison between both diagnostics was performed, optoelectronic pyrometer was used to characterize radiant energy losses in a fully instrumented 4-cylinder direct-injection light-duty diesel engine. In particular swirl ratio, EGR and combustion phasing effects on radiation heat transfer were evaluated.

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“…The model described in the following is a zero-dimensional model, a type which has been shown [10][11][12][13] to provide good predictions of engine performance while being fast enough for energy systems optimisation. Previous work of the authors [8] presented the model and the validation of it.…”

Section: Engine Modelmentioning

confidence: 99%

A comparison of advanced heat recovery power cycles in a combined cycle for large ships

Larsen

Sigthorsson

Haglind

2014

Energy

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A complete 0D thermodynamic predictive model for direct injection diesel engines

Cited by 161 publications

References 50 publications

Model-based multi-parametric programming strategies towards the integration of design, control and operational optimization

Model-based multi-parametric programming strategies towards the integration of design, control and operational optimization

In-cylinder soot radiation heat transfer in direct-injection diesel engines

A comparison of advanced heat recovery power cycles in a combined cycle for large ships

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