Improvement of JENSEN model for the compressor volume flow rate of marine diesel engine

摘要

Modeling is an efficient and validated method in industry digitalization, and it lays a foundation for smart applications like digital twins, fault diagnostics, control system design, and performance optimization. Methods of modeling play a key role. As years passed, JENSEN model has been widely used in turbocharged diesel engines for calculating the mass flow rate of centrifugal compressor of turbocharger. However, it is difficult to get good accuracy and a good convergence performance at the same time. For the first time, we propose a model, called M-JENSEN, which has been validated to be of good accuracy and well convergence performance at the same time. The optimal objective of Jensen's model is the dimensionless pressure head, while the volume flow rate is what the user wants in practice. This difference makes the accuracy loss in Jensen's model. An attempt has been made to change the optimal objective; the accuracy was improved but convergence was hard to reach. Thus, a modified version of Jensen's model, M-JENSEN, was proposed by swapping the position of Mach number and dimensionless pressure head. Compared to Jensen's model, the accuracy of M-JENSEN model was improved by 29.5% measured by R-square and 52.3% measured by RMSE in ABB A270. Its performance was also validated in MAN TCA88 and showed consistent results.