In-Cylinder Temperature Distribution Measurement and Its Application to HCCI Combustion

Kakuho, Akihiko; Nagamine, Morihiro; Amenomori, Yukio; Urushihara, Tomonori; Itoh, Teruyuki

doi:10.4271/2006-01-1202

Cited by 29 publications

(8 citation statements)

References 17 publications

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“…In case of a piston bowl configuration, the role of the intake generated temperature distribution at BDC in the thermal situation at TDC can be assumed as even less important, since the squish flow occurring shortly before TDC transports cold gases from the clearance volume toward the piston bowl. Furthermore, the agreement of this study with the findings in the experimental works 17–19,37 using various engine types and operating conditions indicates that the results of this study are probably valid for a broad range of geometries and operating conditions. Future work will aim at the control of the temperature field during the compression stroke based on the intake generated flow field.…”

Section: Resultssupporting

confidence: 84%

“…The results can be used for approaches aiming at adjusting the thermal stratification during compression, which are motivated by controlling the pressure rise rate and the ignition timing in an HCCI-type combustion process. The minor impact on the thermal situation at BDC on the temperature field at TDC explains why the use of different intake air temperatures for each port by Kakuho et al, 37 Herold et al 18 and Krasselt et al 19 had only limited success in reducing the pressure rise rate during the HCCI-type combustion close to TDC. In contrast to this, the variations in the wall temperature are expected to have a larger impact, which agrees with the experimental study of Sjo¨berg et al, 17 reporting significant reduced heat release rates in an HCCI combustion mode by lowering the coolant temperature by 50 K. However, lower coolant temperatures are followed by increased heat losses.…”

Section: Resultsmentioning

confidence: 99%

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Role of the intake generated thermal stratification on the temperature distribution at top dead center of the compression stroke

Schmitt¹,

Boulouchos²

2016

International Journal of Engine Research

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This work investigates the role of the intake generated thermal stratification in the temperature field evolution during the compression stroke using direct numerical simulation. The analysis compares two direct numerical simulations during the compression stroke, from which one is initialized with a homogeneous temperature distribution and the other one with a stratified temperature field resulting from a precursor direct numerical simulation of the intake stroke. All other initial and boundary conditions are identically imposed. The results show that the thermal situation at bottom dead center has nearly no impact on the evolution of the temperature field and the wall heat transfer during compression. Dominating mechanism for the temperature field evolution is found to be the convective transport of cold gases from the boundary layers toward the cylinder center. As a consequence, the wall temperature and the flow field are the main influencing parameters controlling the evolution of the temperature distribution during compression. This finding can assist practical engine experiments, since it points out which mechanisms are promising to affect the temperature field during the compression stroke. In addition, it explains why the stratification of the temperature field during intake by varying the gas temperatures in the two intake channels showed only a minor impact on the thermal situation at top dead center.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Role of the intake generated thermal stratification on the temperature distribution at top dead center of the compression stroke

Schmitt¹,

Boulouchos²

2016

International Journal of Engine Research

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“…Experiments have been conducted incorporating, among others, variable valve actuation, imaging studies, coolant temperature effects and in-cylinder temperature measurements [15][16][17][18][19][20][21][22][23][24]. Numerical research on thermal stratification was conducted by Sjoberg et al [25].…”

Section: Introductionmentioning

confidence: 99%

The effect of thermal stratification on HCCI combustion: A numerical investigation

Komninos

2015

Applied Energy

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“…Tracer mixtures were already used before to determine the mixing in isothermal flows 23 or the oxygen concentration at isothermal conditions 24,25 and the temperature determination at known oxygen concentration. 26 Furthermore, a two-tracer technique was also employed to qualitatively investigate the evaporation of multi-component fuels and stratification of individual components simultaneously. 27 However, these tracer mixtures have not been applied for the simultaneous detection of various parameters.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous two-dimensional measurement of fuel–air ratio and temperature in a direct-injection spark-ignition engine using a new tracer-pair laser-induced fluorescence technique

Lind

Zigan

Trost

et al. 2015

International Journal of Engine Research

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A planar tracer laser-induced fluorescence technique using a new tracer pair is introduced and has been utilized for the simultaneous detection of the fuel-air ratio and the temperature to characterize mixture formation inside a directinjection spark-ignition engine. The new tracer pair consists of triethylamine and 3-pentanone, which are simultaneously added to the surrogate fuel isooctane. Triethylamine was used for the determination of the fuel-air ratio. The temperature distribution was evaluated with the two-line excitation laser-induced fluorescence technique using 3-pentanone. Prior to the internal combustion engine measurements, the tracer mixture was first investigated in a flow cell to demonstrate the spectral separability of the fluorescence signals and for the extension of the calibration data basis. As a first application, the tracer pair was applied inside a direct-injection spark-ignition engine operated with a split-injection scheme. For the late second injection, the fuel and temperature stratification was studied during the compression stroke. The measured temperature drop due to evaporative cooling effects was found to be about 100 K in the averaged data and up to 125 K in the single-shot measurements. The relation between fuel-rich areas and strong temperature drop can clearly be seen in the results. Furthermore, the suitability of the tracer pair to resolve cyclic variations is visualized.

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In-Cylinder Temperature Distribution Measurement and Its Application to HCCI Combustion

Cited by 29 publications

References 17 publications

Role of the intake generated thermal stratification on the temperature distribution at top dead center of the compression stroke

Role of the intake generated thermal stratification on the temperature distribution at top dead center of the compression stroke

The effect of thermal stratification on HCCI combustion: A numerical investigation

Simultaneous two-dimensional measurement of fuel–air ratio and temperature in a direct-injection spark-ignition engine using a new tracer-pair laser-induced fluorescence technique

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