Abstract

Use dynamics theory to establish finite element model of the needle valve assembly of marine diesel engine in the LS-DYNA and transient analysis calculation by explicit solving method. Analyze the time series diagram of equivalent stress of the impact surface and classify the impact phase according to the kinetic theory. Finally, the strength check is performed in the phase where the influence of the impact is most affected by analyzing the calculated equivalent stress results.

Highlights

  • As one of the key components of the marine diesel engine injection and combustion system, the injector ejects the diesel to the cylinder in the highly atomized state by using the high-pressure oil pump to achieve good cooperation with the compressed air and the combustion chamber [1]

  • Under the dual action of high pressure and high-speed impact, it is very significant to analyze the strength of needle valve assembly to make sure the injection and combustion system of marine diesel engine work normally

  • Differing from the static structure analysis, it is necessary to use dynamics theory to establish a finite element model to analyze the stress of the needle valve assembly during impact [5]

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Summary

Introduction

As one of the key components of the marine diesel engine injection and combustion system, the injector ejects the diesel to the cylinder in the highly atomized state by using the high-pressure oil pump to achieve good cooperation with the compressed air and the combustion chamber [1]. In order to achieve the purpose of the fully combustion of fuel, the injection need to be highly atomized with high frequency [2]. Under the dual action of high pressure and high-speed impact, it is very significant to analyze the strength of needle valve assembly to make sure the injection and combustion system of marine diesel engine work normally. Differing from the static structure analysis, it is necessary to use dynamics theory to establish a finite element model to analyze the stress of the needle valve assembly during impact [5]

Establishment of finite element model
Material definition
Boundary conditions
Results of analysis Analyze the results in three aspects as follows
Conclusion
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