Thermodynamic Properties of Real Porous Combustion Reactor under Diesel Engine-Like Conditions

Weclas, Miroslaw; Cypris, J.; Maksoud, T.M.A.

doi:10.1155/2012/798104

Cited by 13 publications

(18 citation statements)

References 17 publications

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“…Weclas et al [12] simulated the thermodynamic conditions of the heat release process of a diesel engine in a special combustion chamber. The analysis was further extended to a free volume combustion chamber with no porous medium.…”

Section: Literature Reviewmentioning

confidence: 99%

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Influence of Exhaust Gas Recirculation, and Injection Timing on the Combustion, Performance and Emission Characteristics of a Cylinder Head Porous Medium Engine

Chidambaram

Vijayakumar

2015

Journal of Thermodynamics

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Homogeneous combustion has the potential of achieving both near-zero emissions and low specific fuel consumption. However, the accomplishment of homogeneous combustion depends on the air flow structure inside the combustion chamber, fuel injection conditions, and turbulence as well as ignition conditions. Various methods and procedures are being adopted to establish the homogeneous combustion inside the engine cylinder. In this research work, a highly porous ceramic structure was introduced into the combustion chamber (underside of the cylinder head). The influence of operating parameters such as exhaust gas recirculation (EGR) and injection timing on the combustion, performance, and emission characteristics of such developed engine was investigated in this research work.

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Section: Literature Reviewmentioning

confidence: 99%

“…Weclas et al [12] investigated low and high temperature oxidation processes including thermal autoignition under diesel engine-like conditions (nonpremixed mixtures). A special combustion chamber, characterized by constant volume and adiabatic conditions, was used as an engine simulator.…”

Section: Literature Reviewmentioning

confidence: 99%

Influence of Exhaust Gas Recirculation, and Injection Timing on the Combustion, Performance and Emission Characteristics of a Cylinder Head Porous Medium Engine

Chidambaram

Vijayakumar

2015

Journal of Thermodynamics

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“…Similarly to a free volume chamber, the energy converted into heat in increases the internal energy of the gas trapped in the porous reactor (Δ GAS in PM ) and of the porous reactor itself (Δ PM ). Corresponding gas temperature change includes the energy increase of the porous reactor due to heat accumulated in PM [26]. Contrary to the free volume reactor, the gas trapped in a porous reactor volume cannot be thermally decoupled from the internal energy changes of the porous reactor.…”

Section: Free Volume Reactor and Porous Reactor Modelsmentioning

confidence: 99%

“…As a consequence, different changes in the gas temperature trapped in the PM volume result as compared to a free volume reactor. Finally, significantly reduced pressure changes (Δ GAS(PM) ) are measured as a result of the combustion process in the porous reactor as compared to the free gas adiabatic conditions (Δ GAS(FV) ) [26]. In the present paper, both free volume and porous reactor systems have been investigated in a constant volume (76 cm 3 ) combustion chamber.…”

Section: Free Volume Reactor and Porous Reactor Modelsmentioning

confidence: 99%

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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“…A special role in the thermodynamics of the engine cycle with heat release in porous reactor plays the reactor heat capacity resulting in lowering of combustion temperature as well as in internal heat recuperation during the engine cycle [3]. The hot reactor allows three-dimensional ignition and the heat release process is performed in the reactor volume, only.…”

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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Thermodynamic Properties of Real Porous Combustion Reactor under Diesel Engine-Like Conditions

Cited by 13 publications

References 17 publications

Influence of Exhaust Gas Recirculation, and Injection Timing on the Combustion, Performance and Emission Characteristics of a Cylinder Head Porous Medium Engine

Influence of Exhaust Gas Recirculation, and Injection Timing on the Combustion, Performance and Emission Characteristics of a Cylinder Head Porous Medium Engine

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

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

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