Performance of cylindrical and planar meso­scale combustor with double narrow slit flame holder for micropower generator

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.198570

Keywords:

cylindrical mesoscale combustor, planar mesoscale combustor, double narrow slit, entrance to average velocity ratio

Abstract

This research compared the performance of a cylindrical mesoscale combustor against two planar mesoscale combustors, which include the shape of the flame front, temperature of the combustor axis and the combustor wall, and the resulting flammability limit. The combustor used has a circular, square and rectangular cross-section. All three combustors have the same cross-section area and combustion chamber volume. The flame holder used is a double narrow slit. The fuel used is liquefied petroleum gas with a pure oxygen oxidizer. The experiment results showed that the cylindrical combustor produces a more even flame shape that fills the combustion chamber and there is no clear separation between the sides of the flame on each side of the narrow slit. A high ratio of the entrance to average velocity results in a large adverse pressure gradient which generates vortex and recirculation behind the flame holder which gives the mixture a longer chance in the combustion chamber (prolonged residence time). The flame front shape affects the temperature of the combustor axis. The flame front shape that fills the entire combustion chamber has a higher flame temperature than the separate flame front shape. The circular combustor has the highest average axis temperature, but it has the lowest combustor wall temperature. This fact shows that the circular combustor has the smallest heat loss from the flame to the combustor wall. Furthermore, a circular mesoscale combustor has the most extensive stability map. For the same volume, the circular combustor has a lower surface area to volume ratio, thus the heat loss is also low. The dead zone area also becomes narrower, only at a low reactant rate. Rectangular combustors have the largest surface area to volume ratio, thus the losses are also the biggest. Despite the narrowest flammability limits, rectangular combustors have the highest average wall temperatures

Author Biographies

Satworo Adiwidodo, Brawijaya University Jl. Mayjend Haryono, 167, Malang, Indonesia, 65145 State Polytechnic of Malang Jl. Soekarno-Hatta, 9, Malang, Indonesia, 65141

Doctoral Student

Department of Mechanical Engineering

Lecturer

Department of Mechanical Engineering

I Nyoman Gede Wardana, Brawijaya University Jl. Mayjend Haryono, 167, Malang, Indonesia, 65145

PhD, Professor

Department of Mechanical Engineering

Lilis Yuliati, Brawijaya University Jl. Mayjend Haryono, 167, Malang, Indonesia, 65145

Doctor of Mechanical Engineering, Assistant Professor

Department of Mechanical Engineering

Mega Nur Sasongko, Brawijaya University Jl. Mayjend Haryono, 167, Malang, Indonesia, 65145

Doctor of Mechanical Engineering, Assistant Professor

Department of Mechanical Engineering

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Published

2020-04-30

How to Cite

Adiwidodo, S., Wardana, I. N. G., Yuliati, L., & Sasongko, M. N. (2020). Performance of cylindrical and planar meso­scale combustor with double narrow slit flame holder for micropower generator. Eastern-European Journal of Enterprise Technologies, 2(8 (104), 35–43. https://doi.org/10.15587/1729-4061.2020.198570

Issue

Vol. 2 No. 8 (104) (2020): Energy-saving technologies and equipment

Section

Energy-saving technologies and equipment

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Copyright (c) 2020 Satworo Adiwidodo, I Nyoman Gede Wardana, Lilis Yuliati, Mega Nur Sasongko

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