Development of a 2-Stroke CNG Engine for 3-Wheeler Vehicle for the Indian Market

Shanmugam, P.; Anbukarasu, A. S.; Babu, Y Ramachandra; Harne, Vinay; Rairikar, S. D.; Kavathekar, K. P.; Thipse, S. S.; Marathe, N. V.

doi:10.4271/2009-26-0022

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…Thanks to its chemical composition, CNG can lead to a substantial reduction of the tailpipe emissions, especially if combined with appropriate and innovative engine strategies. In literature a wide variety of contributions dealing with the conversion to CNG of existing units for automotive applications can be found, but only a few contributions can be found in case of small-size two-stroke engines (4,5) . The development of strategies and technologies for this specific engine application can result from investigations through refined numerical procedures involving both 1D-and 3Dsimulations, capable to model the scavenging and combustion processes, as in (6,7) .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Scavenging, Combustion and Knock in a Two-Stroke SI Engine Operated with Gasoline and CNG

Fontanesi

Severi

Bozza

et al. 2012

IJAE

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The paper reports a combined experimental and numerical investigation of a small unit displacement two-stroke SI engine operated with either Gasoline and Natural Gas (CNG).It is widely recognized that for two-stroke, crankcase scavenged, carbureted engines the scavenging patterns (fuel short-circuiting, residual gas distribution, point wise lambda field, etc.) plays a fundamental role on both engine performance and tailpipe emissions. To properly characterize the engine behavior in terms of scavenging patterns and combustion, a detailed multi-cycle 3D-CFD analysis of the scavenging process is at first performed starting from preliminary 1D computed boundary conditions provided by a in-house developed 1D model of the whole engine.In order to assess the accuracy of the adopted numerical approach, comparisons between numerical forecasts and experimental measurements of the instantaneous in-cylinder pressure history for steady-state operations of the engine are at first performed and shown in the paper. Subsequently, the activity is focused on the investigation of knock occurrence. In order to limit the computational cost of the simulations, calculations are at first carried out within the 1D modeling framework, where customized quasi-dimensional combustion and knock models are used. In particular, the 1D model is used to compute a numerical knock index which can be useful to address the tuning of the spark advance, given a prescribed and controlled percentage of knock released heat. At the end of the simulation process, the 1D knock index is qualitatively compared to results obtained from full 3D knocking analyses for different incylinder compositions and spark timings. The intrinsic knock-resistance of the CNG fuel is finally numerically exploited, through variations of both compression ratio and spark advance.

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Section: Introductionmentioning

confidence: 99%

Investigation of Scavenging, Combustion and Knock in a Two-Stroke SI Engine Operated with Gasoline and CNG

Fontanesi

Severi

Bozza

et al. 2012

IJAE

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Strategies and Solutions to Control and Reduce the NO_x, HC and CO Levels in Gasoline/Alternate Fueled Engines

Shanmugam

Kathiresan

Senthilnathan

et al. 2010

SAE Technical Paper Series

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Numerical and Experimental Investigation of Fuel Effects on Knock Occurrence and Combustion Noise in a 2-Stroke Engine

Bozza¹,

Fontanesi²,

Gimelli³

et al. 2012

SAE Int. J. Fuels Lubr.

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Knock occurrence is a widely recognized phenomenon to be controlled during the development and optimization of S.I.\ud engines, since it bounds both compression ratio and spark advance, hence reducing the potential in gaining a lower fuel\ud consumption. As a consequence, a clear understanding of the engine parameters affecting the onset of auto-ignition is\ud mandatory for the engine setup. In view of the complexity of the phenomena, the use of combined experimental and\ud numerical investigations is very promising. The paper reports such a combined activity, targeted at characterizing the\ud combustion behavior of a small unit displacement two-stroke SI engine operated with either Gasoline or Natural Gas\ud (CNG).\ud In the paper, detailed multi-cycle 3D-CFD analyses, starting for preliminary 1D computed boundary conditions, are\ud performed to accurately characterize the engine behavior in terms of scavenging efficiency and combustion. In order to\ud assess the accuracy of the adopted numerical approach, comparisons between numerical forecasts and experimental\ud measurements of instantaneous in-cylinder pressure histories are carried out for both gasoline- and CNG-fueled engine\ud operations. 3D analyses are also used to investigate the knock sensitivity of the engine to variations of spark timings in a\ud limited set of operating conditions.\ud The activity is simultaneously developed within a 1D modeling framework, where a detailed quasi-dimensional\ud combustion and knock model is applied to perform a wider investigation of engine performance and knock occurrence for\ud both Gasoline and Natural Gas fuelling. Results from 3D simulations are here used to improve the 1D simulations through\ud a better description of scavenging and combustion processes.\ud Once validated, 1D analyses are in particular finalized to find the knock-limited spark advance by changing both\ud compression ratio and spark timing in order to reduce the fuel consumption. In this phase, a dedicated routine is also\ud developed to have information on combustion related noise, which may limit fuel consumption improvements. Further\ud confirmations on the validity of the 1D approach to the modeling of the knock onset are derived from full-3D knocking\ud analyses over a limited set of engine operating conditions.\ud Advantages and limitations of CNG operations of the engine are briefly pointed out at the end of the paper

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Development of a 2-Stroke CNG Engine for 3-Wheeler Vehicle for the Indian Market

Cited by 3 publications

References 6 publications

Investigation of Scavenging, Combustion and Knock in a Two-Stroke SI Engine Operated with Gasoline and CNG

Investigation of Scavenging, Combustion and Knock in a Two-Stroke SI Engine Operated with Gasoline and CNG

Strategies and Solutions to Control and Reduce the NO_x, HC and CO Levels in Gasoline/Alternate Fueled Engines

Numerical and Experimental Investigation of Fuel Effects on Knock Occurrence and Combustion Noise in a 2-Stroke Engine

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Development of a 2-Stroke CNG Engine for 3-Wheeler Vehicle for the Indian Market

Cited by 3 publications

References 6 publications

Investigation of Scavenging, Combustion and Knock in a Two-Stroke SI Engine Operated with Gasoline and CNG

Investigation of Scavenging, Combustion and Knock in a Two-Stroke SI Engine Operated with Gasoline and CNG

Strategies and Solutions to Control and Reduce the NOx, HC and CO Levels in Gasoline/Alternate Fueled Engines

Numerical and Experimental Investigation of Fuel Effects on Knock Occurrence and Combustion Noise in a 2-Stroke Engine

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Product

Resources

About

Strategies and Solutions to Control and Reduce the NO_x, HC and CO Levels in Gasoline/Alternate Fueled Engines