scholarly journals Effect of turbulence model and inlet boundary condition on the Diesel spray behavior simulated by an Eulerian Spray Atomization (ESA) model

2014 ◽  
Vol 65 ◽  
pp. 108-116 ◽  
Author(s):  
Francisco Javier Salvador ◽  
Jaime Gimeno ◽  
José Manuel Pastor ◽  
Pedro Martí-Aldaraví
Keyword(s):  
Boundary Condition ◽  
Turbulence Model ◽  
Diesel Spray ◽  
Spray Atomization ◽  
Inlet Boundary Condition

Computer Modeling of Diesel Spray Atomization and Combustion

1998 ◽  
Vol 137 (1-6) ◽  
pp. 171-194 ◽  
Author(s):  
J. XIN ◽  
L. RICART ◽  
R.D. REITZ
Keyword(s):  
Computer Modeling ◽  
Diesel Spray ◽  
Spray Atomization

Effects of Non-Uniform Combustor Exit Flow on Turbine Aerodynamics

2012 ◽  
Author(s):  
Stavros Pyliouras ◽  
Heinz-Peter Schiffer ◽  
Erik Janke ◽  
Lars Willer
Keyword(s):  
Boundary Condition ◽  
Test Rig ◽  
Lean Burn ◽  
Lean Combustion ◽  
Flow Mechanisms ◽  
Low Nox Combustion ◽  
Inhomogeneous Temperature ◽  
The Impact ◽  
Inlet Boundary Condition ◽  
Insight Into

Very-low NOx combustion concepts require a high swirl number of the flow in the combustion chamber to allow for lean burn combustion. This article deals with the influence of the resulting combustor exit swirl on the turbine aerodynamics of the first stage. This investigation is based on numerical simulations. According to the literature research additional insight into combustor-turbine interaction is achieved by taking into account a fully two dimensional inlet boundary condition. Up to now published results on combustor-turbine interaction were mostly restricted to the inhomogeneous temperature distribution at the turbine inlet. The investigations are carried out on a real engine geometry — the E3E Core 3/2 — a research project of Rolls-Royce Deutschland on lean combustion. Calculations are conducted by means of the Rolls-Royce plc code Hydra. The swirled inlet boundary condition is further scaled to test rig conditions to check for the transferability between the test rig and the real engine geometry. The results show a significant impact of the inhomogeneous turbine inflow on the stage efficiency and the thermal load. The optimization potential due to the clocking position of the combustor swirl is analyzed. The impact on the secondary flow mechanisms is analyzed with a novel visualization technique. A frequency spectrum analysis is carried out to investigate the effects of the 2D inlet boundary condition on the rotor row.

Large Eddy Simulation of Primary Diesel Spray Atomization

2004 ◽  
Author(s):  
E. de Villiers ◽  
A.D. Gosman ◽  
H.G. Weller
Keyword(s):  
Large Eddy Simulation ◽  
Diesel Spray ◽  
Spray Atomization ◽  
Eddy Simulation ◽  
Large Eddy

Vertical Buoyant Jet Analysis in an Enclosure Using ITM and LES

2004 ◽  
Author(s):  
Allen E. Badeau ◽  
Ismail B. Celik
Keyword(s):  
Experimental Data ◽  
Boundary Condition ◽  
Control Volume ◽  
Three Dimensional ◽  
Grid Resolution ◽  
Scale Model ◽  
Subgrid Scale ◽  
Buoyant Jet ◽  
Subgrid Scale Model ◽  
Inlet Boundary Condition

The objective of this study is to investigate vertical buoyant jets in an enclosure using Large Eddy Simulation (LES) methods with no sub-grid scale model. This type of methodology is called Implicit Turbulent Modeling (ITM). Two different boundary conditions are applied at the inlet, being a uniform and periodic forcing velocity distribution. To accomplish this goal, a numerical solver was written, named DREAM®, which is capable of solving three dimensional, transient flows using an accurate monotonic upwinding scheme. The three-dimensional Navier-Stokes equations are solved in Cartesian coordinates, with the control volume approach being implemented on a staggered grid. The numerical scheme uses a fractional time step method, Crank-Nicolson, with the overall spatial and temporal accuracy being second order. In ITM simulations, there is no explicit subgrid-scale model (SGS) used for the modeling of the small scale vortical structures. ITM simulations assume that through strict conservation of the fluxing quantities in and out of the cell, the grid resolution is fully capable of capturing the important scales of the flow. The control volume averaging techniques used in the ITM methods acts as an implicit subgrid-scale model, and the resolvable scales of the flow are only dependent on the grid resolution within the domain. The available experimental data, as well as simulations that used SGS models, compare favorably to the ITM simulations from DREAM® in most cases as long as an “adequate” grid resolution is maintained. Results show that the density stratification tends to accelerate the jet and increase the amount of turbulence present within the flow. Perturbation of the inlet boundary condition ensures a sooner onset of turbulence, which is faster than the non-perturbed inlet boundary condition. A similarity solution is achieved at approximately 8 and 13 inlet diameters downstream of the inlet for the perturbed and uniform inlet boundary condition. Comparison between the vertical buoyant jet simulations to the available experimental data shows good agreement for the jet width and buoyant path centerline locations based on the internal densimetric Froude number. The application of these methods to immiscible fluids shows a new dimension to ITM and allows for a high resolution of the resulting flow field without the need for an explicit SGS model.

Sign in / Sign up

Export Citation Format

Share Document