Description:

The aim of the proposed research topic is to conduct a study on deposit formation in diesel injection components. The project is planned as a six-month preliminary study for a subsequent comprehensive FVV research project and is intended to provide important basic information on the analysis methods to be used, relevant chemical processes and mechanisms, and the necessary process boundary conditions.

In contrast to FVV project 873, which deals specifically with deposit formation in the injection holes of injection nozzles, the proposed project focuses on internal deposits. Based on the experience of the discussion group members and known publications, the ‘common rail injector’ component is more affected by deposits than other system areas. Due to the fact that there are an increasing number of known cases in which deposits are responsible for malfunctions of injection components, there is great interest in a scientifically sound analysis of the chemical and physical processes and the determining influencing factors.

The planned project will focus on the following areas:

• Research into experience and literature on deposits, boundary conditions and possible influencing parameters
• Research, evaluation and selection of methods for analysing deposits; comprehensive characterisation of fuels
• Evaluation of existing observations such as deposits on injection components
• Analytical examination of the reaction processes – modelling and simulation; verification based on observed deposit compositions
• Sensitivity analysis of the reaction processes with variations in temperature, pressure, fuel and dwell time
• Planning of a detailed research project based on the findings