A new methodology for uncertainties characterization in combustion diagnosis and thermodynamic modelling

Benajes, Jesús; Olmeda, Pablo; Martín, Javier Rodríguez; Carreño, Ricardo

doi:10.1016/j.applthermaleng.2014.07.010

Cited by 75 publications

(65 citation statements)

References 33 publications

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“…A most recent research work was also performed by Benajes et al [23] using this model. In addition a global energy balance in a Diesel engine was performed, using this model, by Payri et al in their research work [24] in which also the equations used in the combustion diagnosis model to perform this global energy balance are explained.…”

Section: Diagnostic Of the Combustion Processmentioning

confidence: 99%

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

Luján

Climent

Novella

et al. 2015

Applied Thermal Engineering

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This paper presents an experimental study of a low pressure EGR loop on a spark ignition (SI) Gasoline Turbocharged Direct Injection (GTDI) engine that will improve the understanding on the advantages and disadvantages of this strategy. Two steady engine operating conditions were investigated, 10 bar and 17 bar at 2000 rpm. At partial load conditions a combustion, performance, air management and exhaust gas emissions study was performed in order to analyses the EGR effect on the GTDI engine. The main advantages found were the reduction in fuel consumption due to the better combustion phasing, and the reduction in pumping losses and heat losses through the cylinder walls. A reduction on NOx, CO and soot was also observed when introducing EGR at these operating conditions. The main disadvantage found was the water condensation after the intercooler. At high load conditions similar analysis and conclusions to the partial load conditions are obtained. The EGR also allowed the combustion to be phased in a more efficient angle by reducing the risk of knocking, which helped reduce the exhaust gas temperature, despite the elimination of the fuel enrichment strategy. A reduction on CO and soot raw emissions was also observed when introducing EGR, as observed at partial load conditions, but a high reduction in NOx, CO, HC and soot emissions was observed after the catalyst since the fuel enrichment strategy is eliminated when cooled EGR is introduced. The main disadvantage found was the turbocharger limitation since higher compression ratio is required in order to keep the same air mass flow as the reference conditions without EGR. The original turbocharger is not designed to provide this higher compression ratio at low engine speed and high load. Results confirm how introducing EGR is a suitable strategy to control knocking and reduce simultaneously exhaust gas temperature and fuel consumption, but the disadvantages found in this investigation must be solved to assure its feasibility as a powerful technology to be implemented in future SI engines.

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Section: Diagnostic Of the Combustion Processmentioning

confidence: 99%

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

Luján

Climent

Novella

et al. 2015

Applied Thermal Engineering

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“…where C and C 2 are constants whose values are 0.12 and 0.001, c m is the mean piston speed, c u is the instantaneous tangential velocity of the gas in the chamber that was adjusted using CFD calculations [30], p 0 is the pressure during motoring conditions assuming a polytrophic evolution, and finally C W1 and C W2 are constants, whose values were adjusted for each engine by means of a combination of experimental and modelling methodology [31].…”

Section: In-cylinder Pressure Signal Analysismentioning

confidence: 99%

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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“…Where C and C 2 are constants whose values are 0.12 and 0.001, c m is the mean piston speed, c u is the instantaneous tangential velocity of the gas in the chamber that was adjusted using CFD calculations [27], p0 is the pressure during motoring conditions assuming a polytrophic evolution, and finally C W1 and C W2 are constants, whose values are adjusted for each engine by means of a combination of experimental and modelling methodology [28].…”

Section: Theoretical Toolsmentioning

confidence: 99%

An Investigation of Radiation Heat Transfer in a Light-Duty Diesel Engine

Benajes¹,

Martín²,

García³

et al. 2015

SAE Int. J. Engines

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In the last two decades engine research has been mainly focused on reducing pollutant emissions. This fact together with growing awareness about the impacts of climate change are leading to an increase in the importance of thermal efficiency over other criteria in the design of internal combustion engines (ICE). In this framework, the heat transfer to the combustion chamber walls can be considered as one of the main sources of indicated efficiency diminution. In particular, in modern direct-injection diesel engines, the radiation emission from soot particles can constitute a significant component of the efficiency losses. Thus, the main of objective of the current research was to evaluate the amount of energy lost to soot radiation relative to the input fuel chemical energy during the combustion event under several representative engine loads and speeds. Moreover, the current research characterized the impact of different engine operating conditions on radiation heat transfer. For this purpose, a combination of theoretical and experimental tools were used. In particular, soot radiation was quantified with a sensor that uses two-color thermometry along with its corresponding simplified radiation model. Experiments were conducted using a 4-cylinder direct-injection light-duty diesel engine fully instrumented with thermocouples. The goal was to calculate the energy balance of the input fuel chemical energy.Results provide a characterization of radiation heat transfer for different engine loads and speeds as well as radiation trends for different engine operating conditions.

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A new methodology for uncertainties characterization in combustion diagnosis and thermodynamic modelling

Cited by 75 publications

References 33 publications

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

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

An Investigation of Radiation Heat Transfer in a Light-Duty Diesel Engine

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