Macro-Cellular Silicon carbide Reactors for Nonstationary Combustion Under Piston Engine-Like Conditions

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

doi:10.1111/j.1744-7402.2010.02591.x

Cited by 28 publications

(39 citation statements)

References 13 publications

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“…Nan et al [20] reported the near-net-shape manufacturing of Ti 3 SiC 2 -based ceramics by three-dimensional printing combined with liquid silicon infiltration. Schlier et al [3] created a macrocellular lattice structure of SiSiC ceramics suitable for air-fuel mixture formation as used in automotive applications. Unbonded precursor powder served as support for ligaments with a thickness of 1.5 mm and a spacing distance exceeding 4.4 mm.…”

Section: Introductionmentioning

confidence: 99%

“…Silicon infiltrated silicon carbide ceramics (SiSiC ceramics) are used for a wide range of engineering applications due to their excellent near-net shape fabrication and good mechanical properties combined with high chemical stability up to elevated temperatures [1][2][3]. SiSiC ceramics with a silicon volume fraction of 10-15% exhibit typical bending strength, fracture toughness and Young's modulus values of approximately 350 MPa, 4 MPa m 0.5 and 350 GPa, respectively [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional printing of SiSiC lattice truss structures

Fu¹,

Schlier²,

Travitzky³

et al. 2013

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three-dimensional printing of SiSiC lattice truss structures

Fu¹,

Schlier²,

Travitzky³

et al. 2013

Materials Science and Engineering: A

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“…Si-SiC ceramics are used for a wide range of applications, especially in tribological issues, which can reduce the wear rate effectively [1][2][3] . Si-SiC ceramics, with a silicon volume fraction of 10%-15%, exhibit typical bending strength, fracture toughness and Young's modulus values of approximately 350 MPa, 4 MPa·m 0.5 and 350 GPa, respectively [4][5] .…”

Section: Introductionmentioning

confidence: 99%

Picosecond laser machining of deep holes in silicon infiltrated silicon carbide ceramics

Zhang

Wang

Liu

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Silicon infi ltrated silicon carbide (Si-SiC) ceramics, as high hardness materials, are diffi cult to machine, especially drilling micro-holes. In this study, the interaction of picosecond laser pulses (1 ps at 1 030 nm) with Si-SiC ceramics was investigated. Variations of the diameter and depth of circular holes with the growth of the laser energy density were obtained. The results indicate that the increase of machining depth follows a nonlinear relation with the increasing of laser energy density, while the diameter has little change with that. Moreover, it is found that some debris and particles are deposited around and inside the holes and waviness is in the entrance and at walls of the holes after laser processing.

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“…Total dimensional changes of < 3% during the whole processing stage were measured. An experimental procedure for manufacturing of the macro-cellular lattice structure has been described in detail in [4]. …”

Section: Porous Combustion Reactorsmentioning

confidence: 99%

“…There is a lack of information on the nature of these processes as performed in porous reactors, especially in a macrocellular structure, under engine-like conditions. The development of such a high-temperature open cell and highly porous macro-cellular structures is necessary for development of this kind of combustion systems [4]. These processes can be divided into two groups: direct fuel injection into a porous reactor and low-and hightemperature oxidation in the reactor.…”

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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Macro-Cellular Silicon carbide Reactors for Nonstationary Combustion Under Piston Engine-Like Conditions

Cited by 28 publications

References 13 publications

Three-dimensional printing of SiSiC lattice truss structures

Three-dimensional printing of SiSiC lattice truss structures

Picosecond laser machining of deep holes in silicon infiltrated silicon carbide ceramics

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

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