Modelling and Analysis of Gas Feeding System Dynamics for Control of Constant Volume Combustion Rig Boundary Conditions

摘要

For focusing on large-scale marine injection systems, a unique research facility has been developed based on existing Constant Volume Combustion Rig (CVCR) available in Marine Machinery laboratory of NTNU. In order to increase operation flexibility, associated with tolerance of wide pressure range during pre-burn phase, a number of modifications has been introduced, particularly those related to gas feeding process. This study was intended to investigate a gas dynamics during the sequential gas feeding into a large-volume CVCR prior combustion. The main interest is in prediction of the gas composition in the rig by the end of gas feeding process. For these needs, a detailed bond graph model was created and simulation of the gas filling system has been performed. The validity of the model has been achieved by the tuning of the model using the obtained experimental data. The results showed the applicability of the bond graph approach for such systems and possibility to predict the gas composition in CVCR and eventually find the optimal operational profile regardless of used gas composition and initial conditions of the system.