1 edition of Analysis of combustion of a porous medium found in the catalog.
Analysis of combustion of a porous medium
Do S. Park
Written in English
|The Physical Object|
|Number of Pages||60|
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Abstract The combustion research in porous medium burners has been reviewed from the early development in up to date. A collection of documented works by different authors was classified and their specific interests were by: This concept used the porous medium combustion technique and is called "PM-engine ".
It is shown that the PM combustion technique can be applied to internal combustion engines. Theoretical. As far as the author is aware, the first work which used liquid fuel combustion with porous medium is the analysis and experimental work of Tseng and Howell (, ) who studied super adiabatic flame prediction for an equivalence ratio less than Also, the flame stability limits for liquid fuel combustion in porous medium is wider than conventional by: Present work is a numerical analysis of combustion of submicron carbon particles inside an inert porous medium where the particles in form of suspension in air enter the porous medium.
Porous media (PM) combustion is an effective method, which can increase the combustion efficiency as well as minimize environmental pollution. The present paper is aimed at thermodynamic analysis.
concerning porous media combustion techniques as applied in engines. The one important reasons of this review is to introduce readers about knowledge for porous media application in internal combustion engine.
Porous Medium (PM) as a heat reactor in diesel engine has been considered as a promising concept to approach. LPG combustion in porous matrix is analyzed.
Chemical kinetics consists of species and reactions. Volumetric radiation is accounted in solid phase energy equation. For comparison, CH 4 combustion in porous matrix is also considered.
Species profiles, emissions, radiant and total heat fluxes are compared. Combustion within porous media is a continuous topic of many studies in the recent decades.
Burners with a porous combustion chamber are advanced types of burners that burn the air and fuel mixture inside a porous body.
Books Advanced Search New Releases Best Sellers & More Children's Books Textbooks Textbook Rentals Best Books of the Month of o results for "Combustion" Skip to. Experimental Analysis Of Performance And Emission Of Single Cylinder Diesel Engine With Porous Medium Combustion Chamber:A Research Article 1 2 3 Ashish M Ambaliya 4 1 P.G.
Student 2 Lecturer 3 Assistant Professor 4P.G. Student 1,4 Mechanical Engineering e of Engineering,Ahmedabad 2. Combustion in porous media is utilized in advanced boiler and surface burners. Further, it is possible to exploit porous medium in domestic heaters, gas turbine combustion chambers, vehicle heaters, fuel cells and energy managements in many industrial processes, such as furnaces and cogeneration systems.
envisaged is the combustion of a non-deforming porous solid medium through which a gas such as air passes. The model represents conservation of mass and energy for both the gas and solid species, whilst the fluid flow is governed by Darcy's law and the ideal-gas law.
This model is highly complex and requires sophisticated computer analysis. The analysis shows that multiple steady solutions may occur, that a minimal mass flow rate is required for steady combustion, and that solutions with complete combustion exist for a large range of. The combustion of a porous graphite fiber plate is analyzed.
A transient one-dimensional, mathematical model is utilized to conduct numerous computer tests. The model simulates the thermal response of a porous graphite fiber plate and it is based on appropriate energy equations.
Combustion in inert porous media is possible if the Peclet-number is high enough (> 65), so that quenching of the flame inside the pores is prohibited. The heat transfer from the combustion zone, to the porous medium itself is very effective because of the very large surface between them. The combustion temperature can be controlled through.
Homogenization of the combustion process is the basic concept in PM engine through fuel vaporization, mixing, and energy recirculation in a porous medium. Part of the heat energy of the burned gases is transferred to the porous medium. This energy is utilized back.
The analysis was done through a comparison with the gas-phase combustion. Porous combustion was found to level down the peak temperature while giving more uniform distribution throughout the domain. The porous combustion as in a burner is proved to provide wider flame stability limits and can hold an extended range of firing.
Homogeneous and complete combustion in internal combustion engines is advantageous. The use of a porous foam in the exhaust gas in an engine cylinder for heat recovery is examined here with the aim of reducing engine emissions.
The internal combustion engine with a porous core regenerator is modeled using SOPHT software, which solved the differential equations for the thermal circuit in the.
Porous medium combustion, already commercially available for several other applications, is a promising technology that can be applied also to household cooking. Experimental analysis of. This goal may be achieved with separation of mixture formation and combustion processes, in diesel engines.
A practicable way to reach this target is the use of porous medium (PM) inside the combustion chamber. The PM has benefits to enhance the evaporation of droplets in liquid-fuel burners, reduce emissions and minimize instabilities. ANALYSIS OF INTERNAL COMBUSTION ENGINE WITH A NEW CONCEPT OF POROUS MEDIUM COMBUSTION FOR THE FUTURE CLEAN ENGINE by Ashok A.
DHALE a*, Gajanan K. AWARI b, and Mahendra P. SINGH c a Fac ul ty, Vidyavar dhini’s Col lege of En gi neer ing and Tech nol ogy Dis trict Thane, Maharashtra, In dia.
The combustion of a porous graphite fiber plate is analyzed. A transient one-dimensional, mathematical model is utilized to conduct numerous computer tests.
An asymptotic analysis of the combustion of a gas moving in a semiinfinite porous medium is performed for large values of the Zel’dovich parameter. The case of a highly porous medium with high gas permeability is considered. The basic terms of asymptotic expansions of the main parameters of the process for combustion and separation regimes are obtained by the method of joined asymptotic.
Due to improved combustion in case of porous media burner (i.e. PKPs), a large reduction is found for CO and NOx emissions. The overall performance of PKPs. analysis of internal combustion engine with a new concept of porous medium combustion for the future clean engine THERMAL SCIENCE: YearVol.
14, No. 4, pp. At present, the emissions of internal combustion engine can only be improved. The simplest flow contains planar combustion and thermal waves, each propagating with its own speed. In this work, we study such a flow, in the case where the porous medium contains initially also some amount of liquid; therefore, vaporization and condensation occur too, giving rise to a wave structure richer than in dry combustion.
We consider the filtration combustion for configuration where air is injected behind the wave into a porous medium containing a solid fuel. The simplest flow contains planar combustion and thermal waves, each propagating with its own speed. In this work, we study such a flow, in the case where the porous medium contains initially also some amount of liquid; therefore, vaporization and.
A one-space-dimensional, time-dependent model for travelling combustion waves in a porous medium is analysed. The key variables are the temperature of the solid medium and its density and the temperature of the gaseous phase and its density.
Gao et al. examined the premixed methane-air combustion in a two-layer porous burner. They compared diverse structures of alumina including foams, beads, and honeycombs as porous medium in their experiments.
The flame stability limits, temperature distribution, pressure drop, and pollutant emissions were investigated. Porous radiant burners based on porous medium combustion technology showed good emission characteristics and offer higher thermal efficiencies. Although, durability of few burners is still a matter of concern which results in non-commercialization of these products.
We determine the Riemann solution for a model of counterflow combustion due to injection of air into a porous medium containing solid fuel. Assuming that the combustion front is modeled by a traveling wave, we obtain a family of Riemann solutions for the same initial and injection conditions.
This concept used the porous medium combustion technique and is called "PM-engine". It is shown that the PM combustion technique can be applied to internal combustion engines. Theoretical considerations are presented for internal combustion engines, indicating that an overall improvement in thermal efficiency can be achieved for the PM-engine.
The results show that the presence of the porous media decreases the maximum exit temperature and causes a more uniform temperature profile at the exit compared with results of combustion without porous medium.
Also, utilizing porous media reduces the CO and unburned fuel concentration at the exit and consequently increases the combustion. Possibilty Of Combustion In Porous Media. Combustion in inert porous media is possible if ; The modified Peclet-number defined with the typical diameter dm ; of the porous cavity size and the laminar flame velocity SL is high ; enough (gt65), for methane /air mixtures.
The combustion inside the porous medium. An analysis of an idealized PM engine cycle is performed. Three essential assumptions are invoked here: (1) The heat capacity of the porous medium is much larger than that of the gas. Thus the temperature of the porous medium can be assumed constant.
(2) Heat losses from the piston, cylinder wall, and PM-chamber are neglected. The compression and. In this paper we perform a numerical bifurcation analysis of a one-dimensional problem arising in premixed combustion in porous inert media.
The analysis shows that multiple steady solutions may occur, that a minimal mass flow rate is required for steady combustion, and that solutions with complete combustion exist for a large range of mass.
A pseudohomogeneous model is used to analyze the steady state of a sharp reaction front in a porous medium. The reaction rate is described by the flame sheet approximation, and an asymptotic matching analysis is used to determine the temperature, conversion and position of the reaction front.
We formulate and analyze a model describing the combustion of porous condensed materials in which a reactant melts and spreads through the pores of the sample. The principal physical conclusion which follows from our analysis is that the flow of the melted component can result in nonuniform composition of the product.
porous medium. We consider two-dimensional filtration combustion in a porous medium in which an exothermic reaction takes place between the solid and a pure gaseous oxidant which is delivered to the reaction zone by filtration through the pores of the medium.
As a result of the reaction, oxidant is consumed and a solid product is formed. The consumption of gas in the reaction causes a pressure gradient which.
We prove the existence of a global solution to the Cauchy problem for a nonlinear reaction-diffusion system coupled with a system of ordinary differential equations. The system models the propagation of a combustion front in a porous medium with two layers, as derived by J.
da Mota and S. Schecter in Combustion fronts in a porous medium with two layers, Journal of Dynamics and Differential. practical operation of a porous medium engine. evelopment Homogenization of the combustion process is the basic concept in PM engine through fuel vaporization, mixing, and energy recirculation in a porous medium.
Part of the heat energy of the burned gases is transferred to the porous medium. This energy is utilized back in the cylinder for.heterogeneous combustion inside ceramic porous media provides numerous advantages, as the ceramic, acts as a regenerator that distributes heat from the flue gases to the upstream reactants, resulting in the extended flammability limits of the reactants.Hashemi SA, Nikfar M and Ghorashi SA.
Numerical study of the effect of thermal boundary conditions and porous medium properties on the combustion in a combined porous-free flame burner. Proc IMechE, Part A: J Power and Energy.
Epub ahead of print .