57 citations · 181 across the 28 of their papers we have counts for
31 papers
Strain-Rate-Consistent -Based Non-Premixed Flamelet Model
Sylvain L. Walsh, Yalu Zhu, Feng Liu +1
This numerical study examines a strain-rate inconsistency in the conventional flamelet/progress-variable (FPV) formulation for non-premixed combustion and proposes an alternative c…
Large-Eddy Simulation and Performance Analysis of a Continuous-Turbine-Burner Stage
Yalu Zhu, Feng Liu, William A. Sirignano
This paper reports the first large-eddy simulation of chemically reacting flow in a turbine stage to analyze the influence of fuel injection and combustion on its aerodynamic and t…
Flamelet Model with Epsilon Tracking in a Turbine Stator
Sylvain L. Walsh, Yalu Zhu, Feng Liu +1
Combustion within a two-dimensional turbine stator passage is numerically investigated in the context of the turbine-burner concept using a Reynolds-Averaged Navier-Stokes framewor…
Performance of Flamelet Models with Epsilon Tracking for Diffusion Flame Simulations
Sylvain L. Walsh, Yalu Zhu, Feng Liu +1
This work examines the physical consistency of the conventional Flamelet Progress Variable (FPV) model for diffusion flame simulations and and introduces a new compressible flamele…
Flamelet Connection to Turbulence Kinetic Energy Dissipation Rate
William A. Sirignano, Wes Hellwig, Sylvain L. Walsh
The turbulence kinetic energy dissipation rate , from a turbulent combustion computation using either Reynolds-averaged Navier-Stokes (RANS) or large-eddy simulation (LES), is p…
Turbulent Accelerating Combusting Flows with a Methane-Vitiated Air Flamelet Model
Sylvain L. Walsh, Lei Zhan, Carsten Mehring +2
This work presents a numerical study of a diffusion flame in a reacting, two-dimensional, turbulent, viscous, multi-component, compressible mixing layer subject to a large favorabl…
Vortex Stretching of Non-premixed, Diluted Hydrogen/Oxygen Flamelets
Wes Hellwig, Xian Shi, William A. Sirignano
A three-dimensional flamelet model considering vortex stretching with unitary Lewis number is used to simulate diluted hydrogen-oxygen diffusion flames. Non-reacting nitrogen is us…
Unsteady Three-dimensional Rotational Flamelet
William A. Sirignano
A new unsteady flamelet model is developed to be used for sub-grid modeling and coupling with the resolved flow description for turbulent combustion. Difficulties with prior unstea…
Numerical Investigation of Diffusion Flame in Transonic Flow with Large Pressure Gradient
Yalu Zhu, Feng Liu, William A. Sirignano
A finite-volume method for the steady, compressible, reacting, turbulent Navier-Stokes equations is developed by using a steady-state preserving splitting scheme for the stiff sour…
Three-dimensional Vorticity Effects on Extinction Behavior of Laminar Flamelets
Wes Hellwig, Xian Shi, William A. Sirignano
A recent rotational flamelet model is developed and tested with an improved framework of detailed chemistry and transport. The rotational flamelet model incorporates the effects of…
Vorticity dynamics in transcritical liquid jet breakup
Jordi Poblador-Ibanez, William Sirignano, Fazle Hussain
Contrary to common assumptions, a transcritical domain exists during the early times of liquid hydrocarbon fuel injection at supercritical pressure. A sharp two-phase interface is…
Combustion Dynamics of Ten-injector Rocket Engine Using Flamelet Progress Variable
Lei Zhan, Tuan M. Nguyen, Juntao Xiong +2
The combustion instability is investigated computationally for a ten-injector rocket engine using the compressible flamelet progress variable (FPV) model and detached eddy simulati…
Reacting and Non-reacting, Three-dimensional Shear Layers with Spanwise Stretching
Jonathan L. Palafoutas, William A. Sirignano
A three-dimensional, steady, laminar shear-layer flow spatially developing under a boundary-layer approximation with mixing, chemical reaction, and imposed normal strain is analyze…
Inward Swirling Flamelet Model
William A. Sirignano
A new rotational flamelet model with inward swirling flow through a stretched vortex tube is developed for sub-grid modeling to be coupled with the resolved flow for turbulent comb…
Temporal atomization of a transcritical liquid n-decane jet into oxygen
Jordi Poblador-Ibanez, William A. Sirignano
The injection of liquid fuel at supercritical pressures is a relevant but overlooked topic in combustion. Typically, the role of two-phase dynamics is neglected under the assumptio…
Three-dimensional, Rotational Flamelet Closure Model with Two-way Coupling
William A. Sirignano
A new flamelet model is developed for sub-grid modeling and coupled with the resolved flow for turbulent combustion. The model differs from current models in critical ways. (i) Non…
Combustion Instability of a Multi-injector Rocket Engine Using the Flamelet Progress Variable Model
Lei Zhan, Tuan M. Nguyen, Juntao Xiong +2
The combustion instability is investigated computationally for a multi-injector rocket engine using the flamelet progress variable (FPV) model. A C++ code is developed based on Ope…
Physics-Aware Neural Network Flame Closure for Combustion Instability Modeling in a Single-Injector Engine
Zeinab Shadram, Tuan M. Nguyen, Athanasios Sideris +1
Neural networks (NN) are implemented as sub-grid flame models in a large-eddy simulation of a single-injector liquid-propellant rocket engine with the aim to replace a look-up tabl…
Liquid-jet instability at high pressures with real-fluid interface thermodynamics
Jordi Poblador-Ibanez, William A. Sirignano
The injection of liquid fuel at supercritical pressures is a relevant topic in combustion, but usually overlooked. In the past, the wrong assumption whereby the liquid experiments…
A Volume-of-Fluid method for variable-density, two-phase flows at supercritical pressure
Jordi Poblador-Ibanez, William A. Sirignano
A two-phase, low-Mach-number flow solver is created and verified for variable-density liquid and gas with phase change. The interface is sharply captured using a split Volume-of-Fl…
Self-similar solution of a supercritical two-phase laminar mixing layer
Jordi Poblador-Ibanez, Branson Davis, William A. Sirignano
Previous works for a liquid suddenly contacting a gas at a supercritical pressure show the coexistence of both phases and the generation of diffusion layers on both sides of the li…
Mixing and Combustion in a Laminar Shear Layer with Imposed Counterflow
William A. Sirignano
Three-dimensional laminar flow structures with mixing, chemical reaction, normal strain, and shear strain qualitatively representative of turbulent combustion at the small scales a…
Strain Rate and Pressure Effects on Multi-branched Counterflow Flames
Claudia-F. López-Cámara, Albert Jordà Juanós, William A. Sirignano
This study presents methane-air counterflow simulations, in computationally efficient similar form, allowing combustible mixtures to flow from one or both directions in order to le…
Neural Network Flame Closure for a Turbulent Combustor with Unsteady Pressure
Zeinab Shadram, Tuan M. Nguyen, Athanasios Sideris +1
In this paper, neural network (NN)-based models are generated to replace flamelet tables for sub-grid modeling in large-eddy simulations of a single-injector liquid-propellant rock…