Experimental Heat Release Rate Analysis in Both Chambers of an Indirect Injection Turbocharged Diesel Engine at Various Load and Speed Conditions

Rakopoulos, C.D.; Hountalas, D. T.; Rakopoulos, Dimitrios C.; Giakoumis, Evangelos G.

doi:10.4271/2005-01-0926

Cited by 16 publications

(10 citation statements)

References 39 publications

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“…Then, the 'mean' of the cylinder (indicator) and the fuel pressure diagrams are obtained, while a 'light smoothing' for the pressure signals is applied [51,52,55] that is based on performing a four-data points weighted smoothing. This seems to offer a reasonable compromise between no loss of valuable signal information and of relatively smooth values for the first derivative of pressure with respect to crank angle.…”

Section: Preliminary Treatment Of the Experimental Pressure Diagrams mentioning

confidence: 99%

“…The pressure is taken equal to the atmospheric one [2,65]. This fact was used to 'reference' the pressure transducers, taking as the value of point at IVC event the average of 5 points before and 5 after its position, in order to minimize the potential error of relying on only one measured point [51,55]. The corresponding temperature was selected 30 K higher than the atmospheric one [65].…”

Section: Numerical Solution Procedures and Computer Programmentioning

confidence: 99%

“…As known, concerning the study of the combustion process in diesel engines, either of the DI or the IDI (indirect injection) type, a very important means to analyze combustion characteristics is the calculation and analysis of heat release rates according to actual measurements of pressures in the (main) chamber (and the pre-chamber, if any) [50][51][52][53][54][55]. Also, a companion diagram of the fuel injection pressure assists towards this side.…”

Section: Article In Pressmentioning

confidence: 99%

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Experimental heat release analysis and emissions of a HSDI diesel engine fueled with ethanol–diesel fuel blends

Rakopoulos

Antonopoulos

Rakopoulos

2007

Energy

281

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Section: Preliminary Treatment Of the Experimental Pressure Diagrams mentioning

confidence: 99%

Section: Numerical Solution Procedures and Computer Programmentioning

confidence: 99%

Section: Article In Pressmentioning

confidence: 99%

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Experimental heat release analysis and emissions of a HSDI diesel engine fueled with ethanol–diesel fuel blends

Rakopoulos

Antonopoulos

Rakopoulos

2007

Energy

281

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“…Significant work has been conducted to assess the impacts of other factors on the ROHR analysis, including crank angle phasing of pressure data, uncertainty in cylinder composition=heat capacity, and heat transfer and crevice flow effects (e.g., see Brunt et al, 1998Brunt et al, , 1999Brusca et al, 2006;Hountalas et al, 2004;Rakopoulos et al, 2005;van Nieuwstadt et al, 2000); however, only one study so far (Lapuerta et al, 2006) has addressed the effects of compressibility or real gas (RG) behavior on computed ROHR curves. In Lapuerta et al (2006), the Lee and Kesler three-parameter corresponding states model was used to account for non-ideal gas behavior for the ROHR calculation.…”

Section: Rohr Analysis For Boosted Ltc Schemes 731mentioning

confidence: 99%

On the Rate of Heat Release for High-Boost, Low-Temperature Combustion Schemes: Accounting for Compressibility Effects

Goldsborough

2009

Combustion Science and Technology

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A methodology has been developed to account for compressibility effects (i.e., non-ideal-gas behavior) in the analysis of heat release rates. These effects may be important for advanced, high-boost, low-temperature combustion schemes currently under investigation, as the high pressure and overall lower temperatures can lead to compressibility factors (Z ¼ Pt/RT) that are significantly greater than 1.0. The rate of heat release (ROHR) formulation developed here uses a generalized energy conservation equation where the cylinder is segregated into three distinct regions (i.e., fresh, burned, and mixed); an arbitrary equation of state can be applied to these zones. Crevice/ringpack flows, which can be substantial under high-boost/high-compression ratio (CR) operation, are taken into account using a source/ sink term. The new methodology is demonstrated using pressure-volume traces for six different engine cycles; these traces have been generated using a real gas engine simulator where the heat release is prescribed by a Wiebe-type function. Results are presented using the Redlich-Kwong-Soave equation of state, with comparisons made between the new formulation and conventional ideal gas ROHR results and computed mean gas temperatures. Noticeable differences in ROHR values are seen for cases where Z becomes greater than 1.05; however, computationally significant differences appear important only for very high or extreme CR operation. A real gas equation of state should be used to estimate the mean charge temperature for all boosted LTC operation as the ideal gas temperature can be off by $ 70-300 K under the cases investigated here.

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“…Diesel engine simulation has contributed enormously during the last 40 years towards new evaluation and development [3][4][5][6][7][8][9][10][11]. Thermodynamic cycle simulations give access to data that otherwise can only be measured with complicated and costly techniques.…”

Section: Introductionmentioning

confidence: 99%

Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions

Rakopoulos¹,

Giakoumis²

2006

SAE Technical Paper Series

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Study and modeling of transient operation is an important scientific objective. This is due to the fact that the majority of daily vehicle driving conditions involve transient operation, with non-linear situations experienced during engine transients. Thus, proper interconnection is needed between engine, governor, fuel pump, turbocharger and load. This paper surveys the publications available in the open literature concerning diesel engine simulations under transient operating conditions. Only those models that include both full engine thermodynamic calculations and dynamic powertrain modeling are taken into account, excluding those that focus on control design and optimization. Most of the attention is concentrated to the simulations that follow the filling and emptying modeling approach. A historical overview is given covering, in more detail, research groups with continuous and consistent study of transient operation. One of the main purposes of this paper is to summarize basic equations and modeling aspects concerning in-cylinder calculations, friction, turbocharger, engine dynamics, governor, fuel pump operation, and exhaust emissions during transients. The various limitations of the models are discussed together with the main aspects of transient operation (e.g. turbocharger lag, combustion and friction deterioration), which diversify it from the steady-state. Some of the most important findings in the field during the last 30 years are presented and discussed. The survey extends to special cases of transient diesel engine simulation, such as second-law analysis, response when the turbocharger compressor experiences surge, and whole vehicle performance. Several methods of improving transient response are also mentioned, based on the various simulations. An easy-to-read tabulation of all research groups dealing with the subject, that includes details about each model developed and engines/parameters studied, is also provided at the end of the paper.

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Experimental Heat Release Rate Analysis in Both Chambers of an Indirect Injection Turbocharged Diesel Engine at Various Load and Speed Conditions

Cited by 16 publications

References 39 publications

Experimental heat release analysis and emissions of a HSDI diesel engine fueled with ethanol–diesel fuel blends

Experimental heat release analysis and emissions of a HSDI diesel engine fueled with ethanol–diesel fuel blends

On the Rate of Heat Release for High-Boost, Low-Temperature Combustion Schemes: Accounting for Compressibility Effects

Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions

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