Abstract
The present work is simulation and experimental performance analysis of a single cylinder spark ignition engine. The simulation model was prepared as a MATLAB code consisting of various input parameters like bore, stroke, compression ratio, spark angle, load, RPM, fuel–air equivalence ratio, inlet pressure, temperature, valve timings, etc. The model uses Wiebe’s heat release model, Annand’s heat transfer model and Blair’s friction model in order to predict the properties with respect to crank angle. Using these data, various performance parameters like brake power, brake thermal efficiency, torque and brake specific fuel consumption were determined by varying the engine speeds, equivalence ratios and loads. The results obtained by simulation were verified by an experimental analysis on a four-stroke single cylinder Honda GX200 computerized Spark Ignition engine. It was observed that the trends in variation of the performance parameters were similar for both the simulation and experimental data. Brake power, torque and brake thermal efficiency were higher in the simulation model whereas brake specific fuel consumption was higher for experimental data. Maximum values of brake power obtained were 2.33 kW for simulation and 1.85 kW for experiment both at 2780 RPM for an engine load of 2.1 kg. Maximum values of torque obtained were 7.35 N m for simulation and 6.35 N m for experiment both at 2780 RPM at an engine load of 2.1 kg. Maximum values of brake thermal efficiency were 13.8% for simulation and 11.3% for experiment both at 2769 RPM for engine load of 1.9 kg. Maximum values of brake specific fuel consumption were 1.92 kg/kWh for simulation and 2.8 kg/kWh for experiment both at 2874 RPM for an engine load of 0.5 kg.
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Abbreviations
- \(V\) :
-
Cylinder volume (m3)
- \({Q}_{in}\) :
-
Heat released inside the cylinder (kW)
- \({V}_{c}\) :
-
Clearance volume (m3)
- \({m}_{f}\) :
-
Fuel flow rate (kg/s)
- \(B\) :
-
Engine bore diameter (m)
- \(f\) :
-
Residual gas fraction
- \({l}_{r}\) :
-
Connecting rod length (m)
- \(r\) :
-
Compression ratio
- \(a\) :
-
Crank radius (m)
- \(CV\) :
-
Calorific Value (kJ/kg K)
- \(s\) :
-
Distance of crank from piston pin (m)
- \({T}_{\mathrm{corr}}\) :
-
Corrected temperature (K)
- \({x}_{b}\) :
-
Mass fraction burned
- \({T}_{CE}\) :
-
Temperature at the end of cycle (K)
- \(N\) :
-
Engine speed (rpm)
- \(\theta\) :
-
Crank angle (ο)
- \({T}_{w}\) :
-
Cylinder wall temperature (K)
- \({\theta }_{s}\) :
-
Start of combustion (ο)
- \({A}_{w}\) :
-
Heat transfer area (m2)
- \({\theta }_{d}\) :
-
Duration of combustion (ο)
- \({h}_{c}\) :
-
Convective heat transfer coefficient (W/m2 K)
- \({\mu }_{\mathrm{gas}}\) :
-
Dynamic viscosity of gas (N s/m2)
- \({h}_{r}\) :
-
Radiative heat transfer coefficient (W/m2 K)
- \({\rho }_{\mathrm{gas}}\) :
-
Density of gas (kg/m3)
- \(Nu\) :
-
Nusselt number
- \(\varnothing\) :
-
Fuel–air equivalence ratio
- \({Q}_{w}\) :
-
Heat loss from wall (kW)
- \(\gamma\) :
-
Specific heat ratio of mixture
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Saikia, P.J., Dutta, P.P., Kalita, P. (2021). Simulation and Experimental Performance Studies of a Computerized Spark Ignition Engine. In: Pandey, K., Misra, R., Patowari, P., Dixit, U. (eds) Recent Advances in Mechanical Engineering. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-7711-6_45
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