Abstract
The performance of an engine whose basic design parameters are known can be predicted with the assistance of simulation programs into the less time, cost and near value of actual. However, inadequate areas of the current model can guide future research because the effects of design variables on engine performance can be determined before. In this study, thermodynamic cycle and performance analyses were simulated for various engine speeds (1800, 2400 ve 3600 1/min) and various excess air coefficients (EAC) (0.95-1.05) to crank shaft angle (CA) with 1 degree increment at full load and 8:1 constant compression ratio (CR) of a SI engine with four stroke, single cylinder and natural aspirated. Brake mean effective pressure, power, thermal efficiency, specific fuel consumption (sfc), etc engine performance parameters were calculated; the values of peak cylinder pressures and temperatures and positions of them were determined by the present program. Variations of these parameters with crank angle, engine speed and excess air coefficient were presented graphically. The calculated results show good agreement with literature. Simulation program is usable to set for varies load, compression ratios, and engine sizes.
Highlights
Researchers have been spending essential effort to improve the performance of SI engines and about internal combustion engines (ICE) they have been practiced on both empirical and theoretical methods
For mathematical modeling of the SI engine, first the engine performance parameters (Sfc, Pe, Pme, thermal efficiency) and the variations of engine pressure and temperatures according to crank shaft angle (CA) for 0.95, 1.0, and 1.05 excess air coefficients (EAC) values at 2400 l/min of engine speed and 8:1 compression ratio were determined, and the same operations were conducted for 1800, 2400, and 3300 l/min engine speeds with an EAC value ranging from 0.8 to 1.1 by an increment of 0.05
As the cylinder pressure and net work area of the diagram is increased by enriching the air-fuel mixture [6,17,18,29], it is observed that maximum cylinder pressure was increased from 38 bar to 50 bar as the EAC is reduced from 1.05 to 0.95
Summary
Researchers have been spending essential effort to improve the performance of SI engines and about internal combustion engines (ICE) they have been practiced on both empirical and theoretical methods. The empirical methods result real outcomes; the design, production and test of the new engines and systems cost more than the theoretical models and need more time. Thermodynamic cycle models are based on the thermodynamic analysis of the content of cylinder during the engine cycle. By the solution of mathematical model, change in performance is researched as each of the engine parameters changed as wanted, it is possible to determine the engine characteristics. By a model tested of accuracy performance of an engine that basic design parameters of it are given can be determined. The values obtained are useful in order to shorten testing of the results expected from engine design and to help the designer to pre-determine the possible effects of various design changes. Compression and expanding processes are not decided as adiabatic during simulation of cycle and pressure change in cylinder, the calculations of gas flow through into intake valve and out to exhaust valve are performed
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