Session: 01-11 Modelling, Simulation and Validation III

Paper Number: 121649

121649 - Large Eddy Simulation With Sliding Mesh Method of a Small-Scale Turbojet Engine 

A monolithic and fully-coupled wall-adapting local-eddy (WALE) large eddy simulation (LES) with sliding mesh turbomachinary method (SMM) of a small-scale gas turbojet engine near the equilibrium running line is conducted. A multi-table compressible flamelet/progress variable (FPV) approach is used for the combustion model. The freestream pressure and temperature, fuel flow rate, and shaft angular speed are the only inputs needed for the Computational Fluid Dynamics (CFD) simulations. The simulations are performed at sea level static and maximum power. The simulations are initiated using a steady Reynolds-average Navier-Stokes (RANS) simulation. The mass flow rate from the RANS simulation is used as an input for the transient LES/SMM/FPV turbojet simulation. The Large Eddy Simulation results are consistent with the RANS simulations, cycle analyses, and experimental data in terms of total temperature and pressure at the diffuser-combustor interface, air and fuel mass flow rate, equivalence ratio, and thrust. The new LES/SMM/FPV model more closely matches the experimental data and outperforms current and previous steady state CFD and thermodynamic cycle calculations. The spatial and temporal distributions of static temperature, static pressure, and axial and azimuthal velocity at the diffuser-combustor and combustor-turbine stator interfaces are examined and discussed in detail.

Presenting Author: Alejandro Briones University of Dayton Research Institute

Presenting Author Biography: The presenter has more than 15 years of experience in Computational Fluid Dynamics, combustion theory, combustors design and optimization through flamelet modeling and evolutionary algorithms. He has also been working in system-level modeling of turbojet engines using dynamic CFD methods.

Authors:

Alejandro M. Briones University of Dayton Research Institute
Brent A. Rankin Air Force Research Laboratory