An Experimental Investigation of the Turbulence Effect on the Combustion Propagation in a Rapid Compression Machine

Guibert, Philippe; Kéromnès, Alan; Legros, Guillaume

doi:10.1007/s10494-009-9225-z

Cited by 28 publications

(29 citation statements)

References 21 publications

(48 reference statements)

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“…Systematic optimization of crevice and entrance channel geometry could be undertaken with aid of automated simulations. Recent experimental 18 and theoretical 19 works suggest that turbulence may be significant and large eddy simulation should be considered in future studies supported by experimental measurements.…”

Section: Discussionmentioning

confidence: 96%

Simplified Approach to the Prediction and Analysis of Temperature Inhomogeneity in Rapid Compression Machines

et al. 2015

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1Substantial progress has been made in understanding and reducing temperature inhomogeneity in rapid compression machines (RCMs) with the help of computational modelling. To date, however, it has not been possible to investigate and map the full range of possible RCM designs, working gases and operating conditions. In this article, we present a framework which simplifies the task of comprehensive and general RCM performance prediction. A set of thermophysical and geometrical parameters have been defined to characterize the design and operating conditions of a general RCM. Dimensional analysis was applied to reduce the number of variables and a sensitivity analysis, based on computational simulations, was used to rank the dimensionless parameters and eliminate unimportant ones. The results of this analysis show that Reynolds number, Prandtl number, aspect ratio, and crevice volume ratio are the most important parameters determining temperature inhomogeneity.A further set of computational simulations was conducted to predict post-compression temperature inhomogeneity over the full range of RCM design and operating parameters. These results are well represented by a simple power law equation that correlates a dimensionless temperature inhomogeneity parameter (mass-averaged over the main chamber) as a function of post-compression time with just three parameters -Peclet number (the product of Reynolds and Prandtl numbers), aspect ratio, and crevice volume ratio. This equation can serve as a simple and general tool for RCM designers and users who wish to determine optimal configurations that minimise temperature inhomogeneity for combustion experiments.2

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Section: Discussionmentioning

confidence: 96%

Simplified Approach to the Prediction and Analysis of Temperature Inhomogeneity in Rapid Compression Machines

et al. 2015

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“…Indeed, the locations of the vortices observed at TDC match those of the thermal kernels. As outlined by Guibert et al [19], these vortices are formed due to gas pinching between the bottom of the cylinder and the piston head. These vortices convey cool gases from the walls towards the centre of the combustion chamber.…”

Section: Temperature Distributions Inside the Rcmmentioning

confidence: 93%

“…An experimental investigation of the turbulence effect on the combustion propagation in a rapid compression machine has been previously conducted in a RCM [19]. This machine can be separated into four main modules: the hydraulic system, a single piston moving inside a precompression chamber (diameter: 91.5 mm), the combustion chamber (diameter: 40 mm, height: 40 mm), and the acquisition and control system.…”

Section: Temperature Measurement Set-upmentioning

confidence: 99%

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Temperature measurements in a rapid compression machine using anisole planar laser-induced fluorescence

Tran¹,

Guibert

Morin

et al. 2015

Combustion and Flame

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, et al.. Temperature measurements in a rapid compression machine using anisole planar laser-induced fluorescence. Combustion and Flame, Elsevier, 2015, 162, pp.3960 -3970. <10.1016/j.combustflame.2015 AbstractAdvanced combustion processes induced by self-ignition mechanisms in piston engines, such as Homogeneous Charge Compression Ignition (HCCI), especially need an accurate spatio-temporal temperature information because their phenomenology therefore their performances highly depend on the thermal conditions. The objective of this study is to measure the temperature distribution inside a rapid compression machine (RCM) using anisole planar laser induced fluroescence. The present paper gives a new insight into the interpretation of RCM autoignition data. It also brings useful information for kinetics-related combustion research and combustion modeling. The anisole planar laser-induced fluorescence (PLIF) technique is applied, in order to observe the formation and the evolution of temperature heterogeneities in the combustion chamber prior to the autoignition process. Anisole is used as a novel tracer species, and the fluorescence signal's dependence on parameters, such as temperature, pressure and bath gas composition, is quantified in a high-pressure, high-temperature facility. Calibration of the fluorescence signal is defined under RCM-related temperature and pressure conditions and a protocol is proposed for postprocessing of the PLIF image sequences, allowing the quantitative field temperatures to be determined at successive instants following compression. In order to gain a better understanding of the mixture process, Particle Image Velocimetry (PIV) measurements are analysed under the same conditions. The correlation between thermal and aerodynamic phenomena is determined. The temperature field is found to be non-uniform, with hot and cold centre positions resulting from recirculation inside the chamber, combined with heat transfer effects from the chamber wall.

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“…Apart from direct measurement of ignition delay time, ex-situ and in-situ speciation measurements can also be conducted to understand the evolution profile of different species. Direct visualization techniques such as Schlieren imaging and chemiluminescence have been used to examine the development of the 38 combustion event [52,79,80]. Moreover, Guibert et al [80] also performed an experimental investigation of the turbulence effect on combustion propagation using particle image velocimetry to determine flow characteristics prior to ignition in a rapid compression machine.…”

Section: Diagnostics In Rcm Experimentsmentioning

confidence: 99%

Using rapid compression machines for chemical kinetics studies

Sung¹,

Curran²

2014

Progress in Energy and Combustion Science

260

127

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Rapid compression machines (RCMs) are used to simulate a single compression stroke of an internal combustion engine without some of the complicated swirl bowl geometry, cycle-to-cycle variation, residual gas, and other complications associated with engine operating conditions. RCMs are primarily used to measure ignition delay times as a function of temperature, pressure, and fuel/oxygen/diluent ratio; further they can be equipped with diagnostics to determine the temperature and flow fields inside the reaction chamber and to measure the concentrations of reactant, intermediate, and product species produced during combustion. This paper first discusses the operational principles and design features of RCMs, including the use of creviced pistons, which is an important feature in order to suppress the boundary layer, preventing it from becoming entrained into the reaction chamber via a roll-up vortex. The paper then discusses methods by which experiments performed in RCMs are interpreted and simulated. Furthermore, differences in measured ignition delays from RCMs and shock tube facilities are discussed, with the apparent initial gross disagreement being explained by facility effects in both types of experiments. Finally, future directions for using RCMs in chemical kinetics studies are also discussed.

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An Experimental Investigation of the Turbulence Effect on the Combustion Propagation in a Rapid Compression Machine

Cited by 28 publications

References 21 publications

Simplified Approach to the Prediction and Analysis of Temperature Inhomogeneity in Rapid Compression Machines

Simplified Approach to the Prediction and Analysis of Temperature Inhomogeneity in Rapid Compression Machines

Temperature measurements in a rapid compression machine using anisole planar laser-induced fluorescence

Using rapid compression machines for chemical kinetics studies

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