By a News Reporter-Staff News Editor at Defense & Aerospace Week -- Investigators discuss new findings in Propulsion and Power. According to news originating from Brisbane, Australia, by VerticalNews correspondents, research stated, "Numerical simulations were carried out to determine the sensitivity of results to a variety of geometric and flow parameters commonly employed in high-speed transverse jet-interaction calculations. The configuration consisted of a single circular, flush-wall porthole injector inclined at 30 deg to the freestream in a Mach 4.0 crossflow."
Our news journalists obtained a quote from the research from the University of Queensland, "Injection was sonic with a jet-to-freestream momentum flux ratio of 2.1. The primary modeling parameters investigated include turbulence model, freestream turbulence intensity, turbulent Schmidt number, and several injector-pipe configurations. The simulations were conducted using the multispecies Reynolds-averaged Navier-Stokes equations with a number of popular turbulence models including the one-equation Spalart-Allmaras model and the two-equation Menter shear stress transport, two-equation realizable k-epsilon, and two-equation nonlinear (cubic) k-epsilon models. The results were found to be very sensitive to both the choice of turbulence model and value of the turbulent Schmidt number. Sensitivities to the boundary conditions imposed on the injector-pipe walls and injector configuration were noted where injection conditions were held constant, but only small variations in results were found where injection mass flow rate was held constant."
According to the news editors, the research concluded: "Finally, variation of the freestream turbulence intensity was found to have almost no influence on the shear stress transport model; however, small effects were identified for the k-epsilon model."
For more information on this research see: Influence of Common Modeling Choices for High-Speed Transverse Jet-Interaction Simulations. Journal of Propulsion and Power, 2013;29(5):1076-1086. Journal of Propulsion and Power can be contacted at: Amer Inst Aeronautics Astronautics, 1801 Alexander Bell Drive, Ste 500, Reston, VA 22091-4344, USA.
The news correspondents report that additional information may be obtained from A.S. Pudsey, University of Queensland, Sch Mech & Min Engn, Brisbane, Qld 4072, Australia. Additional authors for this research include R.R. Boyce and V. Wheatley.
Keywords for this news article include: Brisbane, Propulsion and Power, Australia and New Zealand
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2013, NewsRx LLC