Heat release process in three-dimensional macro-cellular SiC reactor under Diesel engine-like conditions

Cypris, J.; Schlier, Lorenz; Travitzky, Nahum; Greil, Peter; Weclas, Miroslaw

doi:10.1016/j.fuel.2012.05.038

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…By analogy, different configurations and thermal engines with heat recuperation in the porous structure have been previously considered. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The influence of the initial temperature on the heat release process and the corresponding temperature history at a constant initial pressure (p IB = 18 bar), a constant mass of injected fuel and various initial temperatures (T PM = T IB ) is shown in Figure 14. Under these conditions, the resulting excess air ratio decreases with increasing initial temperature (l = f(T IB )).…”

Section: Resultsmentioning

confidence: 99%

Characteristics of the heat release in three-dimensional, highly porous reactors under engine-like conditions in comparison with free diesel injection conditions

Weclas

Cypris

2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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An innovative engine concept with fuel injection and combustion in a three-dimensional porous combustion reactor allows realization of very clean and efficient combustion. In this paper the combustion process as realized in a free-volume combustion chamber and in porous combustion reactors was analysed under diesel-engine-like conditions. A special combustion chamber allows simulations of engine conditions corresponding to the moment when diesel injection begins (the initial conditions). There are characteristic features (modes) of a heat release process that was defined in a two-dimensional and three-dimensional field of the initial pressure and temperature. The characteristic modes of the heat release process in a free-volume chamber were analysed and compared with the process occurring in highly porous three-dimensional combustion reactors. These combustion modes depend on the reactor parameters, especially on its heat capacity, pore structure and density. The combustion in the reactor occurs at a reduced temperature; however, a qualitative similarity of the heat release process to that in a free-volume combustion chamber was proven. Furthermore, a limitation of the reaction rate at high initial temperatures and pressures was recognized in the case of porous reactors. This indicates the applicability of this combustion technology to internal-combustion engines even at high loads and has the favourable effect of a lower combustion noise

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Section: Resultsmentioning

confidence: 99%

Characteristics of the heat release in three-dimensional, highly porous reactors under engine-like conditions in comparison with free diesel injection conditions

Weclas

Cypris

2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…In many sprays, drop Weber numbers are more significant than unity, and drop oscillations, distortions, and breakup must be calculated. Drop collisions and coalescence in a diesel engine can be significant in many engine sprays [19][20][21][22]. Jet interaction with the PM has four phases [3]:…”

Section: Liquid Fuel Injectionmentioning

confidence: 99%

Mathematical Modeling of a Porous Medium in Diesel Engines

Mohammadi

2023

Numerical Simulation - Advanced Techniques for Science and Engineering

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Direct injection diesel engines have high power density with low exhaust emission but suffer from particulate matter (PM). Some new technologies were applied to reduce emissions, but they have not solved the emission problem of diesel engines altogether. The main problem of emissions from diesel engines is the simultaneous process of fuel injection and combustion, so non-homogeneous mixture formation occurs in cylinder space, and non-homogeneity is the main reason for emission generation. The solution to this problem is the separation of injection fuel and combustion processes for homogeneous mixture formation in diesel engines. An applicable practical solution for homogeneous mixture formation is the application of porous media (PM) in diesel engine combustion chambers. PM develops stable ultra-lean combustion and decreases emissions. This chapter has three parts for the mathematical modeling of PM diesel engines. The first part is thermodynamically modeling in a closed cycle. The second is zero-dimensional modeling with the chemical kinetics of PM diesel engines, and the third is three-dimensional CFD modeling with the chemical kinetics of PM diesel engines in open or closed cycle. So, mathematical modeling of PM diesel engines, from simple thermodynamically modeling to complicated 3D modeling, is described in this chapter.

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“…There are two main groups of different applications of porous materials and structures to internal combustion engines: porous structures applied to exhaust posttreatment systems for reduction of engine emissions (outside the engine cylinder and combustion chamber), see, for example, [14,15]; porous structures applied to engine processes, especially inside the engine cylinder (combustion chamber) [2,13]. In the latter case, heat recuperation in a solid phase of the porous structure performs automatically, as the structure has contact with hot burned gases.…”

Section: Characterization Of Highly Porous Reactorsmentioning

confidence: 99%

“…Porous Reactors. Different foam reactors and other porous structures, like wire packings or macrocellular reactors [2], may significantly influence the heat release process. Reactors having different pore sizes and structures may in different manner influence the investigated process.…”

Section: Comparison Of the Heat Release Process In Differentmentioning

confidence: 99%

“…Especially in this case, there is a lack of information on the nature of real processes performed in porous reactors under engine-like conditions. Additionally, development of a high-temperature open cell and highly porous structures for application to internal combustion engines is necessary for development of this kind of combustion systems [2]. Processes performed inside porous reactor can be divided into two groups: direct fuel injection into a porous reactor and low-and high-temperature oxidation in the reactor.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Flameless Combustion in 3D Highly Porous Reactors under Diesel Injection Conditions

Weclas

Cypris

2013

Journal of Combustion

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The heat release process in a free volume combustion chamber and in porous reactors has been analyzed under Diesel engine-like conditions. The process has been investigated in a wide range of initial pressures and temperatures simulating engine conditions at the moment when fuel injection starts. The resulting pressure history in both porous reactors and in free volumes significantly depends on the initial pressure and temperature. At lower initial temperatures, the process in porous reactors is accelerated. Combustion in a porous reactor is characterized by heat accumulation in the solid phase of the porous structure and results in reduced pressure peaks and lowered combustion temperature. This depends on reactor heat capacity, pore density, specific surface area, pore structure, and heat transport properties. Characteristic modes of a heat release process in a two-dimensional field of initial pressure and temperature have been selected. There are three characteristic regions represented by a single- and multistep oxidation process (with two or three slopes in the reaction curve) and characteristic delay time distribution has been selected in five characteristic ranges. There is a clear qualitative similarity of characteristic modes of the heat release process in a free volume and in porous reactors. A quantitative influence of porous reactor features (heat capacity, pore density, pore structure, specific surface area, and fuel distribution in the reactor volume) has been clearly indicated.

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Heat release process in three-dimensional macro-cellular SiC reactor under Diesel engine-like conditions

Cited by 4 publications

References 10 publications

Characteristics of the heat release in three-dimensional, highly porous reactors under engine-like conditions in comparison with free diesel injection conditions

Characteristics of the heat release in three-dimensional, highly porous reactors under engine-like conditions in comparison with free diesel injection conditions

Mathematical Modeling of a Porous Medium in Diesel Engines

Characteristics of Flameless Combustion in 3D Highly Porous Reactors under Diesel Injection Conditions

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