Some Fundamental Observations on the Diesel Jet Destruction and Spatial Distribution in Highly Porous Structures

Weclas, Miroslaw

doi:10.1615/jpormedia.v11.i2.10

Cited by 13 publications

(33 citation statements)

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“…Eormation of liquid fuel deposits on the wall is generally considered to have a negative effect on the combustion process and give rise to higher levels of hydrocarbons emissions, especially in small high speed diesel engines. The interaction between a high pressure fuel spray and a highly porous medium has significantly different features to those observed in spray solid wall impingement, a finding supported by numerical studies [19,20].…”

Section: Introductionmentioning

confidence: 86%

“…Eigure 4 shows a proposed phenomenological model describing the different phases of spray interaction with a porous medium [19]. The first phase (A) concerns the formation of a free jet in the space between the nozzle and the PM; the second phase (B) represents the spray interaction with the PM-interface resulting in partial propagation into PM-volume and partial deflection from the surface.…”

Section: Introductionmentioning

confidence: 99%

“…In the third phase (C), fuel spray distributes throughout the PM-volume. Distribution of the injected fuel inside the PM in this phase is thought to be an important component in the homogenization of the injected liquid [19]. The last phase (D) is characterized by the spray leaving the PM after flowing throughout the PM volume.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the effect of different parameters, Weclas concluded that radial distribution of the impingement jet is enhanced by the PM volume and this can significantly improve the spatial homogenization of the cylinder charge in late direct injection diesel engines [19]. To analyze the development of the spray inside the porous medium, Weclas and Ealtermeier simulated the porous structure by various arrangements of parallel cylinders positioned perpendicularly to the spray axis and then experimentally investigated the interaction of a single fuel spray with them.…”

Section: Introductionmentioning

confidence: 99%

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The Role of Porous Media in Homogenization of High Pressure Diesel Fuel Spray Combustion

Shahangian

Honnery

Ghojel

2013

Journal of Energy Resources Technology

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Interest is growing in the benefits of homogeneous charge compression ignition engines. In this paper, we investigate a novel approach to the development of a homogenous charge-like environment through the use of porous media. The primary purpose of the media is to enhance the spread as well as the evaporation process of the high pressure fuel spray to achieve charge homogenization. In this paper, we show through high speed visualizations of both cold and hot spray events, how porous media interactions can give rise to greater fuel air mixing and what role system pressure and temperature plays in further enhancing this process.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Role of Porous Media in Homogenization of High Pressure Diesel Fuel Spray Combustion

Shahangian

Honnery

Ghojel

2013

Journal of Energy Resources Technology

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“…These processes can be divided into two groups: direct fuel injection into a porous reactor and low-and hightemperature oxidation in the reactor. The former processes include Diesel-jet interaction with the highly porous structure described with reference to multi-jet splitting and fuel vaporization in a hot reactor [5][6][7]. Low-temperature oxidation processes include cool-and blue-flame reactions that occur just after injection begins during the ignition delay time period [8,9].…”

Section: Introductionmentioning

confidence: 99%

Application of macro-cellular SiC reactor to diesel engine-like injection and combustion conditions

Cypris¹,

Weclas²,

Greil³

et al. 2012

AIP Conference Proceedings

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A test stand for the evaluation of high efficiency mist eliminators Rev. Sci. Instrum. 83, 105107 (2012) The adoption behavior of new energy automotive technology in Chinese firms: A knowledge rigidity perspective J. Renewable Sustainable Energy 4, 031802 (2012) Biodiesel as an alternative fuel for direct injection diesel engines: A review J. Renewable Sustainable Energy 4, 012703 (2012) Performance of copper coated two stroke spark ignition engine with methanol-blended gasoline with catalytic converter J. Renewable Sustainable Energy 4, 013102 (2012) Additional information on AIP Conf. Proc. ABSTRACTOne of novel combustion technologies for low emissions and highly efficient internal combustion engines is combustion in porous reactors (PM). The heat release process inside combustion reactor is homogeneous and flameless resulting in a nearly zero emissions level. Such combustion process, however is non-stationary, is performed under high pressure with requirement of mixture formation directly inside the combustion reactor (high pressure fuel injection). Reactor heat capacity resulting in lowering of combustion temperature as well as internal heat recuperation during the engine cycle changes the thermodynamic conditions of the process as compared to conventional engine. For the present investigations a macro-cellular lattice structure based on silicon carbide (non-foam structure) with 600 vertical cylindrical struts was fabricated and applied to engine-like combustion conditions (combustion chamber). The lattice design with a high porosity > 80 % was shaped by indirect threedimensional printing of a SiC powder mixed with a dextrin binder which also serves as a carbon precursor. In order to perform detailed investigations on low-and high-temperature oxidation processes in porous reactors under engine-like conditions, a special combustion chamber has been built and equipped with a Diesel common-rail injection system. This system simulates the thermodynamic conditions at the time instance of injection onset (corresponding to the nearly TDC of compression in a real engine). Overall analysis of oxidation processes (for variable initial pressure, temperature and air excess ratio) for free Diesel spray combustion and for combustion in porous reactor allows selection of three regions representing different characteristics of the oxidation process represented by a single-step and multi-step reactions Another characteristic feature of investigated processes is reaction delay time. There are five characteristic regions to be selected according to the delay time (t) duration. These analyses indicate qualitative similarity of heat release process as performed under Diesel-like and in porous reactor conditions, except significantly reduced combustion temperature in porous reactor due to its large heat capacity.

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Experimental evaluation of the performance and exhaust emissions of porous medium diesel and Otto engines

Tangestani

Isfahani

2019

Int. J. Environ. Sci. Technol.

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Some Fundamental Observations on the Diesel Jet Destruction and Spatial Distribution in Highly Porous Structures

Cited by 13 publications

References 0 publications

The Role of Porous Media in Homogenization of High Pressure Diesel Fuel Spray Combustion

The Role of Porous Media in Homogenization of High Pressure Diesel Fuel Spray Combustion

Application of macro-cellular SiC reactor to diesel engine-like injection and combustion conditions

Experimental evaluation of the performance and exhaust emissions of porous medium diesel and Otto engines

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