The Simulation And Research Of Natural Gas Engine Based On GT-Power

Natural gas as a clean energy, with large storage capacity, less harmful material discharge after burning, antidetonating quality is good wait for a characteristic, is an ideal alternative fuel.Natural gas engines compared with gasoline engine and diesel engine, there is a difference in terms of performance and fuel economy, in order to improve the performance and fuel economy of natural gas engine, we need to optimize the parameters of the engine.When parameters of natural gas engine is optimized, knocking phenomena are the important factors that affect the engine fuel combustion, so we need to study of knocking regularity of natural gas engines.In this paper, on the basis of turbocharged natural gas engine used to generate electricity of natural gas engine performance and the rule of the detonation is studied.The main research work includes:(1) GT- Power software is used to establish the simulation model of a turbocharged natural gas engine used to generate electricity and through the comparison of simulated data and experimental data to verify the accuracy of the model.(2) The natural gas engine simulation model was used to study the different compression ratio, ignition advance Angle, intake valve open time and the exhaust valve open time have different influence law to parameters of natural gas engine performance, fuel economy and emission characteristics and knocking moment, knock intensity, and knocking index.(3) The DOE(Design of experiment)model was used to optimize natural gas engine performance and these important paramaters.By natural gas engine simulation model of the simulation results compared with the experimental results, the accuracy of simulation model is verified. There are a lots of researchs were maded that the influence law of different compression ratio, different ignition advance angle to natural gas engine performance, fuel economy and emission characteristics and study the compression ratio and ignition advance Angle’s influence on natural gas engine knocking beginning moment, knock intensity and knocking index. The results show that with the increase of compression ratio, the possibility of engine knocking is increased, the moment of engine knocking occurs is in advance, engine knocking intensity is increasing,With the increase of spark advance angle, the possibility of engine knocking is increased, the moment of engine knocking occurs is in advance, the knocking intensity is increased. In the end, DOE(design of experiment) technology is used to compression ratio, ignition advance Angle, intake valve opening time and the exhaust valve open time for the influencing factors, and to the engine torque, gas consumption rate, NOx emissions, CO emissions and HC emissions as the target variable, to explosion pressure as constraint conditions to optimize natural gas engine performance.The gas consumption rate is highest decreased by 15.3%, the torque is highest increased by 10.3%, the NOx emissions is highest decreased by 19.6%. Under the conditions of rated power, the gas consumption rate is reduced by 5.3%, the torque is increased by 6.7%, the NOx emissions is decreased by 6.4%, under the condition of rated power CO emissions reduced by 3.6%, under the condition of rated power HC emissions reduced by 1.9%.