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Performance, emission, and combustion characteristics of twin-cylinder common rail diesel engine fuelled with butanol-diesel blends

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Abstract

Nitrogen oxides and smoke are the substantial emissions for the diesel engines. Fuels comprising high-level oxygen content can have low smoke emission due to better oxidation of soot. The objective of the paper is to assess the potential to employ oxygenated fuel, i.e., n-butanol and its blends with the neat diesel from 0 to 30% by volume. The experimental and computational fluid dynamic (CFD) simulation is carried out to estimate the performance, combustion, and exhaust emission characteristics of n-butanol-diesel blends for various injection timings (9°, 12°, 15°, and 18°) using modern twin-cylinder, four-stroke, common rail direct injection (CRDI) engine. Experimental results reveal the increase in brake thermal efficiency (BTE) by ~ 4.5, 6, and 8% for butanol-diesel blends of 10% (Bu10), 20% (Bu20), and 30% (Bu30), respectively, compared to neat diesel (Bu0). Maximum BTE for Bu0 is 38.4%, which is obtained at 12° BTDC; however, for Bu10, Bu20 and Bu30 are 40.19, 40.9, and 41.7%, which are obtained at 15° BTDC, respectively. Higher flame speed of n-butanol-diesel blends burn a large amount of fuel in the premixed phase, which improves the combustion as well as emission characteristics. CFD and experimental results are compared and validated for all fuel blends for in-cylinder pressure and nitrogen oxides (NOx), and found to be in good agreement. Both experimental and simulation results witnessed in reduction of smoke opacity, NOx, and carbon monoxide emissions with the increasing n-butanol percentage in diesel fuel.

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Abbreviations

ATDC:

After top dead center

Bu:

Butanol

CRDI:

Common rail direct injection

D t :

Diffusion coefficient

\( {\tilde{\dot{E}}}_{Fu}^{F\to M} \) :

Unmixed fuel source term

\( {\tilde{\dot{E}}}_{O_2}^{A\to M} \) :

Unmixed oxygen source term

ECFM3Z:

Extended coherent flame model three zone

EVC:

Exhaust valve closing

EVO:

Exhaust valve opening

IMAP:

Intake manifold air pressure

IMAT:

Intake manifold air temperature

IT:

Injection timing

IVO:

Inlet valve opening

IVC:

Inlet valve closing

M Fu :

Molar mass of fuel

R :

Universal gas constant

S c and S ct :

Laminar and turbulent Schmidt numbers

\( {\overline{S}}_{\mathrm{NO}} \) :

Mean nitric oxide source term

\( \tilde{u} \) :

Density-weighted average velocity

\( {\overline{\dot{\omega}}}_x \) :

Average combustion source term

ζ :

Transformed coordinate system

\( {\left.{\overline{\rho}}^u\right|}_u \) :

Density of the unburned gases

ε :

Dissipation rate

ϕ :

Equivalence ratio

ϕ s :

Soot mass fraction

μ :

Dynamic viscosity

τ d :

Ignition delay

\( \overline{\rho} \) :

Reynolds averaged fuel density

\( {\tilde{Y}}_{\mathrm{NO}} \) :

Mean mass fraction of NOx

x i :

Cartesian coordinates

M NO :

Molar mass

\( \frac{dc_{\mathrm{NO}\ \mathrm{prompt}}}{dt} \) :

Prompt mechanisms

\( \frac{dc_{\mathrm{NO}\ \mathrm{thermal}}}{dt} \) :

Thermal mechanisms

μ t :

Turbulent viscosity

\( {\tilde{Y}}_x \) :

Averaged mass fraction of species x

M M :

Mean molar mass of the gases in the mixed area

M Fu :

Molar mass of fuel

M air + EGR :

Mean molar mass of the unmixed air + EGR gases

\( \overline{\rho} \) :

Mean density

\( {\tilde{Y}}_{O_2}^{\infty } \) :

Oxygen mass fraction

τ m :

Mixing time

\( {\tilde{Y}}_{T{\mathrm{O}}_2} \) :

Oxygen tracer

\( {\tilde{Y}}_{TFu} \) :

Fuel tracer

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Acknowledgements

The authors like to acknowledge AVL-AST, Graz, Austria, for the granted use of AVL-FIRE under the University Partnership Program.

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Correspondence to Ajay Kumar Yadav.

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Responsible editor: Philippe Garrigues

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Lamani, V.T., Yadav, A.K. & Gottekere, K.N. Performance, emission, and combustion characteristics of twin-cylinder common rail diesel engine fuelled with butanol-diesel blends. Environ Sci Pollut Res 24, 23351–23362 (2017). https://doi.org/10.1007/s11356-017-9956-7

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