A unique feature of reciprocating combustion in porous media is the system’s capability to sustain
combustion of extremely dilute fuel gases and to maintain steep temperature gradients in the inlet and
outlet area of the porous media. However, for porous media with a high thermal conductivity, which are
considered for application in thermoelectric conversion, the temperature gradients decrease; without a
steep temperature gradient, reaction occurs in a wide region of the porous medium and it becomes difficult
to establish a stable flame position. To counter this problem, a new arrangement of the porous media with
a center space is proposed that stabilizes flame position for a wide operating range. Additionally, the new
system largely extends the flammable range and reduces the specific energy input needed to sustain combustion.
Overall, the effectiveness to generate a temperature difference in porous media with high thermal
conductivity could be improved by the new system.
Besides flame stabilization, an additional interesting feature of introducing a center space is the possibility
of fuel injection into it, which leads to increased maximum temperatures (i.e., to a heat release at a
higher energy level). This presents a great advantage over conventional reciprocating combustion in porous
media where the maximum temperature is limited by the temperature of self-ignition for the premixed
combustible gases.
Introductio
A unique feature of reciprocating combustion in porous media is the system’s capability to sustaincombustion of extremely dilute fuel gases and to maintain steep temperature gradients in the inlet andoutlet area of the porous media. However, for porous media with a high thermal conductivity, which areconsidered for application in thermoelectric conversion, the temperature gradients decrease; without asteep temperature gradient, reaction occurs in a wide region of the porous medium and it becomes difficultto establish a stable flame position. To counter this problem, a new arrangement of the porous media witha center space is proposed that stabilizes flame position for a wide operating range. Additionally, the newsystem largely extends the flammable range and reduces the specific energy input needed to sustain combustion.Overall, the effectiveness to generate a temperature difference in porous media with high thermalconductivity could be improved by the new system.Besides flame stabilization, an additional interesting feature of introducing a center space is the possibilityof fuel injection into it, which leads to increased maximum temperatures (i.e., to a heat release at ahigher energy level). This presents a great advantage over conventional reciprocating combustion in porousmedia where the maximum temperature is limited by the temperature of self-ignition for the premixedcombustible gases.Introductio
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