Investigation of injectors for large bore gas engines used for alternative fuels in an optically accessible injection chamber
Investigation of injectors for large bore gas engines used for alternative fuels in an optically accessible injection chamber
In order to achieve future climate targets, the decarbonisation of fuels and, subsequently, the development of suitable injection systems and large engines are in the focus of development activities.
Fuel preparation and in particular the injector play a central role in robust and low-emission engine operation. In order to better understand the injector behaviour and validate the simulation models, the boundary conditions of the engine are simulated as realistically as possible in an injection chamber and the injector jet propagation is recorded with a high-speed camera using Schlieren and diffuse backlight illumination technology. The aforementioned measurements are carried out under various boundary conditions (such as injection pressure, gas pressure, gas temperature, injection duration, injector nozzle geometry, etc.). Relevant measured variables, such as current and voltage values of the injector, as well as the pressure values of the chamber and the fuel line, are recorded using an oscilloscope.
The optical data is compared with the oscilloscope data. The results are used to evaluate the injector and fuel jet behaviour with regard to fuel preparation and to validate simulation models.
Fuel preparation and in particular the injector play a central role in robust and low-emission engine operation. In order to better understand the injector behaviour and validate the simulation models, the boundary conditions of the engine are simulated as realistically as possible in an injection chamber and the injector jet propagation is recorded with a high-speed camera using Schlieren and diffuse backlight illumination technology. The aforementioned measurements are carried out under various boundary conditions (such as injection pressure, gas pressure, gas temperature, injection duration, injector nozzle geometry, etc.). Relevant measured variables, such as current and voltage values of the injector, as well as the pressure values of the chamber and the fuel line, are recorded using an oscilloscope.
The optical data is compared with the oscilloscope data. The results are used to evaluate the injector and fuel jet behaviour with regard to fuel preparation and to validate simulation models.
Target:
The aim of the work is to investigate the injection jets of injectors for alternative fuels, to adapt the evaluation software, to carry out the measurements and evaluations and to derive possible optimisation measures for the spray formation and injector behaviour.
Tasks:
- Literature research on the topic: “Large engine injectors for alternative fuels and their fuel conditioning”
- Elaboration of the measurement matrix
- Adaptation of the test bench infrastructure and evaluation software
- Carrying out the measurements and analysing the measurement data
- Derivation of possible optimisation measures with regard to spray formation and injector behaviour
Prerequisite: Basic knowledge of measurement technology and data analysis
Starting date: As soon as possible
Duration: Approximately 6 months
Contact:
Univ.-Prof. Dr.-Ing. Nicole Wermuth, +43 (316) 873-30087, nicole.wermuth@lec.tugraz.at
Dipl.-Ing. Dr. Anton Tilz, +43 (316) 876-30140, anton.tilz@lec.tugraz.at