Numerical and Experimental Investigation on High-Pressure Diesel Spray

Closing Date

30th June 2020*

Applicants should contact the primary supervisor, and submit their Expression of Interest (EOI) and Application as soon as possible.

*unless filled earlier

The Research Project

Global concerns to reduce emissions are continuously forcing manufacturers to improve the efficiency of engines by optimising fuel injection systems and combustion process. Despite the wide use of injectors, the key physics of the fuel injection processes are not yet fully understood imposing a significant challenge for the development of more efficient injection system and combustion process. The primary atomisation of the liquid fuel jet occurs in the region close to the nozzle exit, influences secondary atomisation, spray dynamics, air-fuel mixture quality, and ultimately the entire combustion process. Complex and concurrent physics associated with primary and secondary atomisation of liquid fuel induce more constraints for researchers to experimentally characterise the effect of phenomena such as swirl flow, flow separation, cavitation, and turbulence on spray dynamics.  

These limitations can be tackled by the means of numerical modellings which provide a clearer understanding of spray dynamics involving transition from liquid jets to fine droplets. Numerical models which are used in the design of fuel injectors are subjected to further developments through the inclusion of recent research findings. Experimental tests conducted within the AMC's constant volume high-pressure spray chamber provide a qualitative and quantitative database to evaluate and validate numerical modelling results. The present work focuses on processes in the nozzle and the first several nozzle diameters after the nozzle exit of a single-hole solid cone injector.

High fidelity numerical model can be utilised to characterise detailed evolution of fuel spray from liquid jets to dispersed small scale droplets. The use of high-resolution numerical scheme and flux reconstruction algorithm can deal with highly turbulent flow phenomenon that occur with a great variation in spatial and time scales. Highly accurate results predicted by the developed high-resolution numerical methods can act as an indispensable supplement to existing experimental observations and measurements, which contribute to the optimisation/development of next generation low emission and high thermal efficiency combustion engines.

Eligibility
  • The project is open to domestic (Australian and New Zealand) and international candidates
  • The degree must be undertaken on a full-time basis
  • Applicants must have already been awarded a First-Class Honours degree or hold equivalent qualifications or relevant and substantial research experience in an appropriate sector
  • Applicants must be able to demonstrate strong research and analytical skills
  • Applicants must be the first author of at least two published (or accepted) high-ranked journal papers

Essential Skills/Experience/Requirements

  • Good understanding of fluid mechanics specifically in the framework of high-pressure and compressible flows
  • Good understanding of CFD theories including pressure-velocity coupling, heat and mass transfer, multiscale-modelling in the framework of compressible flow
  • Experience in OpenFOAM (experience in structured mesh generation and high order numberical scheme are preferred)

Desirable Skills/Experience

  • Experience in high pressure fuel injection system
  • Experience in developing explicit/implicit method for all March number flows
  • Experience in data processing using Python
  • Experience in C++
  • Ability to conduct spray chamber testing and work to assemble, disassemble and commission new injection systems

See the following web page for entry requirements: www.utas.edu.au/research/degrees/what-is-a-research-degree

Application Process

Applicants who require more information or are interested in this specific project should first contact the listed Supervisor. Information and guidance on the application process can be found on the Apply Now website.

Information about scholarships is available on the Scholarships webpage.

More Information

Please contact, Javad Mehr for further information.