Abstract
The paper presents a performance prediction model of marine low-speed two-stroke diesel engines based on an advanced MCC (mixture controlled combustion) model coupled with a fuel injection model. Considering the time of real calculation, the so-called “concentrated exhausting gas” scavenging model and the working process model are used in the present work, and improved by introducing the ratio of pure combustion product over the total gas mass in the cylinder as an expression of the working medium components. The reaction rate model in the zero-dimensional MCC model is improved by introducing the fraction of combustion product in the fuel spray, and the relationship between the combustion model and scavenging quality is established. Meanwhile, the combustion model was simplified in the diffusion combustion phases and integrated with the fuel injection model in order to respond to the change of injection profile and injection timing. A large-scale low-speed marine diesel engine was used for a simulation. The results of the whole model are consistent with experimental data and the speed of calculation is fast enough for real time simulation of low speed and medium speed diesel engines. The prediction model can be used in the design and calibration of the electronic control system and performance optimization of the marine two-stroke diesel engine.
Highlights
To comply with stricter and stricter regulations on environmental protection, manufacturers of diesel engines developed and are developing new technology to reduce emission of NOx, CO2, and other pollutant emissions
If a multi-injection or post-injection occurs, does the model mode change into the former stage of combustion from the later? Secondly, if the gas exchanging process is very important to the performance of the marine two-stroke engine, how does the combustion model response if the quality of the gas exchanging varies? The objective of the present work is initially to find a solution for these two problems
A large-scale two-stroke marine diesel engine is taken as the test engine
Summary
To comply with stricter and stricter regulations on environmental protection, manufacturers of diesel engines developed and are developing new technology to reduce emission of NOx , CO2 , and other pollutant emissions. There are a lot of parameters that need to be adjusted or monitored during engine running. These parameters can be classified as three types: inputs that can be modified, parameters that provide information about the real system state, and the engine outputs [1]. The desired value of outputs can be achieved by adjusting inputs which in turn are adjusted by engine control system. Calibration of the engine and its controller requires extensive activity at the engine test bench. A model for the real-time calculation of the engine working cycle could be considered an important aid [2]
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