An Improved Prediction of Pre-Combustion Processes, Using the Discrete Multicomponent Model

Kabil, I.; Qubeissi, Mansour Al; Badra, Jihad; Abdelghaffar, W.A.; Eldrainy, Yehia A.; Sazhin, Sergei; Im, Hong G.; Elwardany, Ahmed

doi:10.3390/su13052937

Cited by 3 publications

(13 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The DC and MDQD models for the formulation of fuel surrogates ,, and the implementation of these models into numerical codes used for combustion simulations are described. A typical example of the full-cycle simulation of the ICE performed using ANSYS Fluent, with the new models implemented into it, is presented . The results are verified and validated, where possible.…”

Section: Introductionmentioning

confidence: 72%

“…In ref , the models described in Section 3 were implemented as user-defined functions (UDF) (see refs and for details about the UDFs used in the analysis) into CONVERGE (a commercial Computational Fluid Dynamics (CFD) code)…”

Section: Spray and Full Cycle Modelingmentioning

confidence: 99%

“…Predicted, using the conventional CONVERGE (dashed-dotted curve) and customized version of CONVERGE (solid curve), and measured (symbols) squared radii of the fuel droplet vs time. Reproduced with permission from ref .…”

Section: Spray and Full Cycle Modelingmentioning

confidence: 99%

See 2 more Smart Citations

Heating and Evaporation of Droplets of Multicomponent and Blended Fuels: A Review of Recent Modeling Approaches

et al. 2021

Self Cite

View full text Add to dashboard Cite

In this review, recent models for the heating/evaporation of multicomponent and blended fuel droplets and their implementation into numerical codes, used for the analysis of the processes in internal combustion engines, are reviewed. In these models, the diffusion of species, recirculation, and temperature gradient inside droplets are considered. The focus of the review is on the group of models based on the implementation of the analytical solutions to the heat transfer and species diffusion equations inside droplets into numerical codes. Four key aspects are summarized: (1) application of the Discrete Component (DC) model and the Multi-Dimensional Quasi-Discrete Model (MDQDM) to a broad range of fuels, including petrol, diesel, ethanol, and biodiesel fuels and their blends, (2) formulation of fuel surrogates, with a focus on the recently introduced Complex Fuel Surrogate Model (CFSM), (3) overview of the recently introduced transient algorithm, Transient Multi-Dimensional Quasi-Discrete Model (TMDQDM), for an autogeneration of quasi-components, and (4) implementation of the latter into a computational fluid dynamics (CFD) code for a realistic engineering application to full cycle simulation in internal combustion engines. The original and modified versions of the DC model and MDQDM are evaluated for the heating and evaporation of droplets of bio/fossil-fuel (e.g., ethanol/petrol/biodiesel/diesel) blends. These were implemented into commercial CFD software and validated. The feasibility of formulating complex fuel surrogates for fuel blends, their implementation into CFD codes, and their application in the full engine cycle simulation before and after the onset of combustion (autoignition) are described.

show abstract

Section: Introductionmentioning

confidence: 72%

Section: Spray and Full Cycle Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Heating and Evaporation of Droplets of Multicomponent and Blended Fuels: A Review of Recent Modeling Approaches

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…When modeling droplet phase changes, some authors use commercial codes [42], while others employ their own developed codes. The latter case is the present work.…”

Section: Methodsmentioning

confidence: 99%

The Influence of Droplet Dispersity on Droplet Vaporization in the High-Temperature Wet Gas Flow in the Case of Combined Heating

et al. 2021

View full text Add to dashboard Cite

The change in the thermal and energy state of the water droplet is defined numerically. The influence of droplet dispersity on the interaction of the transfer processes was evaluated. In influence of the Stefan flow was considered as well. The internal heat transfer of the droplet was defined by the combined heat transfer through effective conductivity and radiation model. The results of the numerical modeling of heat and mass transfer in water droplets in a wet flue gas flow of 1000 °C highlight the influence of the variation in heat transfer regimes in the droplet on the interaction of the transfer processes in consistently varying phase change regimes. The results of the investigation shows that the inner heat convection diminishes intensively in the transitional phase change regime because of a rapid slowdown of the slipping droplet in the gas. The radiation absorption in the droplet clearly decreases only at the final stage of equilibrium evaporation. The highlighted regularities of the interaction between combined transfer processes in water droplets are also valid for liquid fuel and other semi-transparent liquids sprayed into high-temperature flue gas flow. However, a qualitative evaluation should consider individual influence of dispersity that different liquids have.

show abstract

“…Instead, it is based on the assumption that all of these factors can be ignored. The reasons behind these simplifications were discussed in [45]. The work presented in [46] was the first work that investigated the implementation of a model for droplet heating and evaporation by accounting for the temperature gradient inside the droplet.…”

Section: Pre-combustion Analysismentioning

confidence: 99%

Combustion of Fuel Surrogates: An Application to Gas Turbine Engines

2021

Self Cite

View full text Add to dashboard Cite

The previously developed approaches for fuel droplet heating and evaporation processes, mainly using the Discrete Multi Component Model (DMCM), are investigated for the aerodynamic combustion simulation. The models have been recently improved and generalised for a broad range of bio-fossil fuel blends so that the application areas are broadened with an increased accuracy. The main distinctive features of these models are that they consider the impacts of species’ thermal conductivities and diffusivities within the droplets in order to account for the temperature gradient, transient diffusion of species and recirculation. A formulation of fuel surrogates is made using the recently introduced model, referred to as “Complex Fuel Surrogate Model (CFSM)”, and analysing their heating, evaporation and combustion characteristics. The CFSM is aimed to reduce the full composition of fuel to a much smaller number of components based on their mass fractions, and to formulate fuel surrogates. Such an approach has provided a proof of concept with the implementation of the developed model into a commercial CFD code ANSYS Fluent. A case study is made for the CFD modelling of a gas turbine engine using a kerosene fuel surrogate, which is the first of its kind. The surrogate is proposed using the CFSM, with the aim to reduce the computational time and improve the simulation accuracy of the CFD model.

show abstract

An Improved Prediction of Pre-Combustion Processes, Using the Discrete Multicomponent Model

Cited by 3 publications

References 30 publications

Heating and Evaporation of Droplets of Multicomponent and Blended Fuels: A Review of Recent Modeling Approaches

Heating and Evaporation of Droplets of Multicomponent and Blended Fuels: A Review of Recent Modeling Approaches

The Influence of Droplet Dispersity on Droplet Vaporization in the High-Temperature Wet Gas Flow in the Case of Combined Heating

Combustion of Fuel Surrogates: An Application to Gas Turbine Engines

Contact Info

Product

Resources

About