
Yujuan LuoTechnical University of Darmstadt | TU · Department of Mechanical Engineering (Dept.16)
Yujuan Luo
Master of Science
About
23
Publications
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Introduction
Skills and Expertise
Education
September 2014 - March 2017
September 2010 - June 2014
Publications
Publications (23)
A turbulent side-wall quenching (SWQ) flame in a fully developed channel flow is studied using Large-Eddy Simulation (LES) with a tabulated chemistry approach. Three different flamelet manifolds with increasing levels of complexity are applied: the Flamelet-Generated Manifold (FGM) considering varying enthalpy levels, the Quenching Flamelet-Generat...
Artifical neural networks (ANNs) are universal approximators capable of learning any correlation between arbitrary input data with corresponding outputs, which can also be exploited to represent a low-dimensional chemistry manifold in the field of combustion. In this work, a procedure is developed to simulate a premixed methane-air flame undergoing...
Artifical neural networks (ANNs) are universal approximators capable of learning any correlation between arbitrary input data with corresponding outputs, which can also be exploited to represent a low-dimensional chemistry manifold in the field of combustion. In this work, a procedure is developed to simulate a premixed methane-air flame undergoing...
In the present study, reduced kinetics considering both differential diffusion effects and strong heat losses, based on the Reaction–Diffusion Manifold (REDIM) method, formulated and constructed in generalized coordi-nates, is proposed. The approach fully coupled to a CFD solver is applied to the side-wall quenching (SWQ) of a laminar premixed dime...
Hydrogen is a carbon-free energy carrier that can substantially support the decarbonization of the power generation and transportation sector in the near future. Blending H2 into natural gas represents a feasible option to continue using the current infrastructure, allowing a smooth transition to pure H2 combustion technologies. In the present stud...
In manifold-based reduced models, a manifold is often generated based on an a-priori identification. Subsequently, a successful reduced kinetic computation is largely dependent on the proper choice of the model assumptions. To relax this restriction, a model reduction on the fly technique is proposed for the Reaction-Diffusion Manifold (REDIM) meth...
Fundamental studies on Flame-Wall Interaction (FWI) are of the utmost importance to unravel the intricate coupling between chemistry and transport in the near-wall region, and to characterize the quenching dynamics. For this purpose, an accurate description of reaction kinetics is especially needed. In this work, the role of chemistry during the wa...
Side-wall quenching (SWQ) is one of the generic configurations for flame-wall interaction and has been widely investigated through simulations using detailed and reduced chemical kinetics. In all previous related studies using manifold-based reduced kinetic models, the reduced model equations are solved in thermokinetic coordinates. This study, by...
The local heat-release rate and the thermo-chemical state of laminar methane and dimethyl ether flames in a side-wall quenching configuration are analyzed. Both, detailed chemistry simulations and reduced chemistry manifolds, namely Flamelet-Generated Manifolds (FGM), Quenching Flamelet-generated Manifolds (QFM) and Reaction-Diffusion Manifolds (RE...
Head-on quenching is a canonical configuration for flame-wall interaction. In the present study, the transient process of a laminar premixed flame impinging on a wall is investigated for different strain rates, while previous studies with detailed chemistry and transport focused only on unstrained conditions. Increasing strain rate leads to a reduc...
A flamelet tabulation method for partially premixed flames is proposed, in which partially premixed flamelets are incorporated as the archetypal flamelet elements. This method considers triple flame structures with both the partial premixing of fuel in the oxidizer side and the partial premixing of oxidizer in the fuel side, by replacing the pure-a...
In this work, large-eddy simulations of pulverized coal combustion are conducted using the flamelet model, in which the devolatilization, char surface reactions, radiation and flame-wall interactions (FWI) are all considered. The mixings between the oxidizer and the volatiles/char off-gases are described with two mixture fractions Zvol and Zchar, w...
A three mixture fraction flamelet model is proposed for multi-stream laminar pulverized coal combustion. The technique of coordinate transformation is utilized to map the flamelet solutions from a unit pyramid space into a unit cubic space to improve the stability of the simulation. The validity of the three mixture fraction flamelet model was asse...
In this work, three different flamelet tabulation methods for spray combustion are evaluated. Major differences among these methods lie in the treatment of the temperature boundary conditions of the flamelet equations. Particularly, in the first tabulation method (“M1”), both the fuel and oxidizer temperature boundary conditions are set to be fixed...
In this paper, pulverized coal flames stabilized in a three-dimensional laminar counterflow configuration are simulated with detailed chemistry and the flame behaviors are analyzed in detail. Effects of radiation, coal particle mass flow rate and strain rate on the pulverized coal flame structure are investigated. The results show that the coal par...
In many practical pulverised coal combustion systems, different oxidiser streams exist, e.g. the primary- and secondary-air streams in the power plant boilers, which makes the modelling of these systems challenging. In this work, three tabulation methods for modelling pulverised coal combustion are evaluated through an a priori study. Pulverised co...
Volatile matter is generally treated as postulated substance or a combination of different species because the detailed chemical compounds in volatile matter are not yet completely understood. However, very few studies investigate the effects of volatile matter composition and chemical reaction mechanism on the pulverized coal combustion characteri...
In the present work, the flamelet/progress variable (FPV) approach based on two mixture fractions is formulated for pulverized coal combustion and then evaluated in laminar counterflow coal flames under different operating conditions through both a priori and a posteriori analyses. Two mixture fractions, Zvol and Zchar, are defined to characterize...
The problem of shock interaction with a rigid circular cylinder has been investigated using a compressible immersed boundary method coupled with high-order weighted-essentially non-oscillatory (WENO) scheme. First, the accuracy of the developed code is validated. Then, influences of the incident shock Mach number on the flow-field structure and dyn...
The process of shock interaction with a rigid cylinder is studied using a compressible immersed boundary method combined with a high-order weighted essentially nonoscillatory scheme. Movement of the cylinder is coupled to the flow field. First, the accuracy of the numerical scheme is validated. Then the influences of the incident shock Mach number...
To describe the combustion process in the burners with complicated configuration used in the industrial applications, a non-adiabatic three-stream flamelet/progress variable (FPV) model for simulating pulverized coal combustion (PCC) is proposed in the context of large eddy simulation (LES). A conserved scalar associated with oxidizer split is intr...
Interaction between shock and particle is a common phenomenon in supersonic multiphase flow, which is of great importance. In the paper, immersed boundary method combined with high-order WENO scheme is adopted to simulate the process of shock/cylinder interaction. Two cases with different shock strengths are studied. One case is with Ms=1.3, while...