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Sādhanā

, 43:211 | Cite as

State-of-the-art technology in variable compression ratio mechanism for spark ignition engine

  • Ashish J Chaudhari
  • Vinayak Kulkarni
  • Niranjan Sahoo
Article
  • 16 Downloads

Abstract

Present investigations deal with development of a novel variable compression ratio (VCR) mechanism and its implementation in a small and relatively large size single-cylinder engines. Operation of this mechanism is found to be smooth and effective in the running condition of the engine as well. This mechanism, when incorporated in the small size spark ignition HONDA engine, portrayed improvement in engine performance with increment in compression ratio (CR) for petrol and kerosene. Their respective optimum CRs 5.02 (petrol) and 5.27 (kerosene) are higher than the base value 4.8. In case of large size KIRLOSKAR engine, the present VCR mechanism is found to be useful while operating with liquefied petroleum gas (LPG), where measurements showed that combustion duration is lower with LPG for CR 9.79 as compared with base value 9.0. The present experiments clearly demonstrate the usefulness of VCR mechanism in improving engine performance for a given fuel and broadening the range of alternative fuels burnt in the engine. Ease of fabrication, simplicity in installation, accessibility in troubleshooting and smooth run-time alterations are the advantages with the current novel mechanism.

Keywords

Variable compression ratio spark ignition engine ball screw assembly engine head modification clearance volume 

List of symbols

\( b \)

width of piston ring

\( BP \)

brake power (W)

\( BSFC \)

brake-specific fuel consumption (kg/kW-h)

\( BTE \)

brake thermal Efficiency (%)

CR

compression ratio

\( d_{p} \)

diameter of secondary piston (mm)

\( d_{spark} \)

diameter of spark plug (mm)

\( E \)

modulus of elasticity of material (N/mm2)

\( F \)

force on piston due to combustion of fuel air (N)

\( F_{a} \)

axial load (N)

\( F_{r} \)

radial load (N)

\( l' \)

radius of neutral axis before installation (mm)

\( l_{g} \)

circumferential gap of piston ring (mm)

\( LHV \)

lower heating value of fuel (kJ/kg)

\( L_{h} \)

life of ball screw in millions of revolution

\( m_{f} \)

mass of fuel consumed (kg/h)

\( n \)

number of revolutions per cycle (for 4 strokes, \( n = 2 \))

\( N \)

speed (rpm)

Pmax

design pressure (N/m2)

\( P_{rad} \)

radial load on ring (N)

\( r \)

radius of rope wire (m)

\( r' \)

radius of neutral axis after installation of ring (mm)

\( R \)

radius of rope drum (m)

\( S \)

spring load (N)

\( t_{r} \)

radial thickness of piston ring (mm)

\( t_{w} \)

thickness of secondary cylinder (mm)

\( V_{c} \)

clearance volume (cm3)

\( V_{d} \)

swept volume (cm3)

\( X \)

radial force factor

\( Y \)

axial force factor

\( W \)

brake load (N)

\( \sigma_{allow} \)

maximum allowable stress (N/mm2)

Subscript

\( act \)

original

\( aux \)

secondary

Notes

Acknowledgements

Authors would like to thank the Department of Science and Technology, Government of India, for the financial support for facility development to carry out the present research.

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  • Ashish J Chaudhari
    • 1
  • Vinayak Kulkarni
    • 1
  • Niranjan Sahoo
    • 1
  1. 1.Centre for EnergyIndian Institute of Technology GuwahatiGuwahatiIndia

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