| The wide use of vehicles such as automobiles and ships deteriorate the environmental and resource problems,which makes it urgent to find new energy replacing petroleum.Natural gas has drawn much attention with the advantages of low price,low emission and rich storage.Many scholars have pointed out that it is the most suitable alternative fuel.However,the current application technology of natural gas reduces the dynamic behavior of internal combustion engines.Therefore,it's of great significance to improve the dynamic performance of natural gas engine by parameters optimization.In this thesis,a model of 2135 G natural gas engine is established in GT-Power to simulate the performance of natural gas engine as well as a further exploration of insufficient power.The model accuracy is verified under all working conditions by comparing with the experimental data.The influence of advanced ignition angle,compression ratio and gas distribution phase on the dynamic is investigated under various load conditions to optimize the engine parameters.Then the effectiveness of this optimization is verified by comparing the performance of original natural gas engine and the optimized engine.According to the results,the optimized engine performance has been significantly improved as well as the economic efficiency.In addition,a prediction model of natural gas engine is used to simulate and analyze the knocking-related factors.By combing the working principle of the natural gas engine,a simulation model is established in GT-Power in this thesis.Then the performance,knocking and dynamic optimization of the natural gas engine are deeply studied,which can provide a certain reference for the design and application of the natural gas engine. |
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