PUB - Measurement setup for the investigation of the influence of dissolved gas on injection phenomena

 

During the 10th FSC Conference in Aachen, a poster on the topic of "Gas Solubility of Fuels" was presented. Measurement results and methods were presented which can be used to determine the influence of dissolved gases on injection behavior.

 

Content

Authors: Hofmeister, Marius; Rambaks, Andris; Schmitz, Katharina; Grunewald, Mathias Michael Engelbert; Reddemann, Manuel; Kneer, ReinholdPreliminary investigations have shown that some bio-hybrid fuels are capable of dissolving large amounts of nitrogen. High amounts of dissolved nitrogen have been proven to have a strong influence on multiphase flow phenomena, such as degassing and cavitation in injection nozzles. Further investigations to explain the exact influence as well as the mechanisms of action will be carried out in the future.

However, the large number of potential bio-hybrid fuel candidates and gases leads to many gas fuel combinations. Because of the time consuming nature of the measurements, which is caused by the extremely long diffusion times of gas into the liquid, an efficiency increase of the measurement time for the determination of the gas dissolving capacity as well as for the investigation of the nozzle flow and spray characterization is reasonable.

For this reason, the existing measurement setup was adapted in several ways. A stepper motor and electronic valves are used to build up pressure in the Bunsen test rig. In this way, individual measuring points can be set fully automatically and without the supervision of measuring staff. In addition, the night hours can now also be used for measurements and fuel conditioning.

To further enable parallel investigation, a concept for a simplified test bench was developed, which allows fuel conditioning and injection tests to be carried out independently of the original measurement setup used for characterization.

In this contribution, the mentioned improvements are presented. In addition, the results for other gas-fuel combinations tested with the improved setup will be shown.