Thermodynamic data at extremely high flow velocities pertaining to catalytically stabilized combustion systems with highly conductive materials
Description
The thermodynamic data at extremely high flow velocities are obtained for catalytically stabilized combustion systems with highly conductive materials. The catalyst in the catalytically stabilized combustion system generally operates at a temperature approximating the theoretical adiabatic flame temperature of the fuel-air admixture charged to the combustion zone. The entire catalyst may not be at these temperatures, but preferably a major portion, or essentially all, of the catalyst surface is at such operating temperatures. The temperature of the catalyst zone is controlled by controlling the composition and initial temperature of the fuel-air admixture as well as the uniformity of the mixture. The residence time is governed largely by temperature, pressure and space throughput, and generally is measured in milliseconds. The volume of catalyst is taken as the total superficial volume encompassing the active catalyst and any less active support, including any voids or gas passages through the catalyst. The catalytically stabilized combustion system comprises a concentric annular channel, wherein the concentric annular channel further comprises an inner annular channel and an outer annular channel. The concentrically arranged annular channel is 5.0 millimeters in inner channel length, 5.6 millimeters in outer channel length, 0.8 millimeters in innermost diameter, 2.6 millimeters in outermost diameter, 0.1 millimeters in catalyst layer thickness, and 0.2 millimeters in wall thickness. The spacing between the inner channel and the outer channel is 0.4 millimeters and remains constant. The continuous flow reactor can have any dimension unless restricted by design requirements. All the walls have the same thickness. One of the potential problems associated with the continuous flow reactor continues to be combustion stability. The maximum Reynolds number is less than 360 at the flow inlet and 960 when the velocity of the flow of the fluid is highest in the channels. The model is implemented in commercially available software FLUENT to obtain the solution of the problem. Detailed chemistry is included in the model. Detailed chemical mechanisms are playing an increasingly important role in developing chemical kinetics models for combustion. Detailed chemical mechanisms are incorporated into the reacting flow for the continuous flow reactor. The homogeneous combustion is modeled with the detailed chemical mechanism for methane oxidation in CHEMKIN format. Detailed heterogeneous chemistry in SURFACE-CHEMKIN format is included in the model. Contributor: Junjie Chen, E-mail address: koncjj@gmail.com, ORCID: 0000-0002-5022-6863, Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China
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Steps to reproduce
The governing equations are solved numerically for the conservation of mass and momentum and for energy and species. Overall heat and mass balances are achieved and the net imbalance is less than one percent of smallest flux through the domain boundaries. The solution converges when the residuals reach the specified tolerance and overall property conservation is satisfied.