“…5 and 6. The combustor designer may obtain further insight by observing a similar series of streamline plots predicted by Novick et al [23] for an isothermal dump combustor flow field with the following differences: a 90 deg expansion, an inlet hub, and a constricted exit. Figures 4(a) and 4(b) show swirl velocity profiles for the corresponding geometries with vane angles of 45, 60, and 70 deg.…”
Combustor modeling has reached the stage where the most useful research activities are likely to be on specific sub-problems of the general three-dimensional turbulent reacting flow problem. The present study is concerned with a timely fluid dynamic research task of interest to the combustor modeling community. Numerical computations have been undertaken for a basic two-dimensional axisymmetric flowfield which is similar to that found in a conventional gas turbine combustor. A swirling nonreacting flow enters a larger chamber via a sudden or gradual expansion. The calculation method includes a stairstep boundary representation of the expansion flow, a conventional k-e turbulence model and realistic accommodation of swirl effects. The results include recirculation zone characterization and predicted mean streamline patterns. In addition, an experimental evaluation using flow visualization of neutrally-buoyant helium-filled soap bubbles is yielding very promising results. Successful outcomes of the work can be incorporated into the more combustion-and hardware-oriented activities of gas turbine engine manufacturers, including incorporating the modeling aspects into already existing comprehensive numerical solution procedures.
“…5 and 6. The combustor designer may obtain further insight by observing a similar series of streamline plots predicted by Novick et al [23] for an isothermal dump combustor flow field with the following differences: a 90 deg expansion, an inlet hub, and a constricted exit. Figures 4(a) and 4(b) show swirl velocity profiles for the corresponding geometries with vane angles of 45, 60, and 70 deg.…”
Combustor modeling has reached the stage where the most useful research activities are likely to be on specific sub-problems of the general three-dimensional turbulent reacting flow problem. The present study is concerned with a timely fluid dynamic research task of interest to the combustor modeling community. Numerical computations have been undertaken for a basic two-dimensional axisymmetric flowfield which is similar to that found in a conventional gas turbine combustor. A swirling nonreacting flow enters a larger chamber via a sudden or gradual expansion. The calculation method includes a stairstep boundary representation of the expansion flow, a conventional k-e turbulence model and realistic accommodation of swirl effects. The results include recirculation zone characterization and predicted mean streamline patterns. In addition, an experimental evaluation using flow visualization of neutrally-buoyant helium-filled soap bubbles is yielding very promising results. Successful outcomes of the work can be incorporated into the more combustion-and hardware-oriented activities of gas turbine engine manufacturers, including incorporating the modeling aspects into already existing comprehensive numerical solution procedures.
“…\ Ενδεικτικά μόνο μπορεί κανείς να αναφέρει τον κώδικα TEAM του UMIST, τον MINT (βλ. McDonald, 1979), τον COSMIC (Novick et al, 1979), τον MAC (βλ. Roach, 1972και Benesch & Kremer, 1984, τον STARPIC (Lilley & Rhode, 1982), κλπ.…”
Section: στ) το μοντέλο ακτινοβολίας της μη-ισορροπούσας διάχυσης (Non-equilibrium Diffusion Radiation Model)unclassified
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.