Abstract
Problem statement: The variation of the in-cylinder gas flow characteristics for single cylinder port injection hydrogen fueled internal combustion engine was investigated through transient state simulation. Approach: One dimensional gas dynamics was described the flow and heat transfer in the components of the engine model. Special attention is paid to selection and correction of heat transfer correlation which describe of in-cylinder heat transfer to coincide with the practical observations. The engine model was simulated with variable engine speed and Air Fuel Ratio (AFR). Engine speed varied from 2000-5000 rpm with increment equal to 1000 rpm, while AFR changed from stoichiometric to lean limit. Results: The acquired results showed that the maximum in-cylinder temperature and pressure obtained of 2753 K and 49.62 bar at 24°CA ATDC and 13°CA ATDC for AFR = 34.33 respectively, while the minimum in-cylinder temperature and pressure obtained of 1366 K and 29.14 bar at 18 deg CA of ATDC and 8 deg CA of ATDC for AFR = 171.65 respectively. The obtained results show that AFR has a crucial effect on characteristics variation during the power cycle whilst engine speed has minor effects. Conclusion: These results utilized for study the combustion process, fuel consumption, emission production and engine performance.
Highlights
Hydrogen, as alternative fuel, has unique properties of the internal combustion engines during the intake, give it significant advantage over other types of fuel. compression, expansion and exhaust strokes are an Hydrogen can be used as a clean alternative to important stage for the comprehension of physical petroleum fuels and its use as a vehicle fuel is phenomenon which occurs in the motor cycle
Transient gas flow and heat transfer simulations for the in-cylinder of four stroke port injection spark ignition hydrogen fueled engine model was run for two operation parameters namely air-fuel ratio Air Fuel Ratio (AFR) and engine speed
One dimensional CFD model to predict the variation of transient in-cylinder gas flow characteristics was developed
Summary
As alternative fuel, has unique properties of the internal combustion engines during the intake, give it significant advantage over other types of fuel. compression, expansion and exhaust strokes are an Hydrogen can be used as a clean alternative to important stage for the comprehension of physical petroleum fuels and its use as a vehicle fuel is phenomenon which occurs in the motor cycle. Extensive studies has a great influence in to the performance of the were investigated hydrogen fueled internal combustion engine. Now-a-day the usage of about the energy shortage and environmental Computational Fluid Dynamics (CFD) codes are used protection, research on improving engine fuel economy, to simulation the engine performance and visualize the hydrogen fueled engine is being developed into a flow characteristics (Khalighi et al, 1994). Computational the growing number of vehicles on the road day by modeling and analysis of the gas flow in-cylinder is a day increases. The characteristics have major influence on combustion pressure losses in these ports are included in the process, fuel consumption, emission production and discharge coefficients calculated for the valves. Gas flow characteristics for the hydrogen fueled internal combustion engine by utilizing CFD analysis. The effects of engine speed and AFR on in-cylinder gas flow field characteristics are revealed
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