Effect of micro combustor geometry on combustion and emission behavior of premixed hydrogen/air flames

Yılmaz, Harun; Çam, Ömer; Yılmaz, İlker

doi:10.1016/j.energy.2017.06.169

Cited by 51 publications

(6 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An increase of 10 -20 K temperature difference from single to dual combustor results in an increase of ~ 0.2 to 0.in con for the dual combustor system. Recent numerical studies[37,38,47] also predicted similar improvements in thermal characteristics of multichannel microcombustors over a single-channel microcombustor. A detailed energy balance is obtained for intermediate velocities of 3, 5 and 7 m/s at  = 1.0.…”

mentioning

confidence: 68%

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

2018

View full text Add to dashboard Cite

A new concept of dual microcombustor based thermoelectric micropower generator with high power density (~0.14 mW/mm 3) and high conversion efficiency (4.66 %) is reported in this work. A new configuration with a dual microcombustor system is experimentally investigated with two thermoelectric modules and operates with liquefied petroleum gas as fuel. The dual microcombustor is fabricated using a rectangular aluminium metal block and detailed investigations on flame stability limits and thermal characteristics were carried out. Dual microcombustor configuration helps to significantly improve the flame stability limits and thermal characteristics over the single combustor configuration due to increased flame-surface interaction and enhanced heat recirculation through solid walls. Maximum power point tracking (MPPT) algorithm is applied to achieve a maximum power output of 4.52 W with a maximum conversion efficiency of 4.66 %. The application of porous media significantly helped improve the upper flame stability limits with a maximum conversion efficiency of 4.32 %, and 4.66 %, at  = 1 and 0.9 respectively at 10 m/s mixture velocity. The system compactness and high output power with significantly improved conversion efficiency shows the possibility of its application in various portable micro-scale power generators for remote, stand-alone, military and aerospace applications.

show abstract

mentioning

confidence: 68%

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

2018

View full text Add to dashboard Cite

show abstract

“…Results show that the new combustor could achieve a higher average temperature of the radiation wall caused by the improvement of heat transfer. Yilmaz et al [136] realized that the input chemical energy conversion rate to utilizable heat energy could increase by nearly 30% more than that of the single-channel combustor when it had the multi-channel arrangement.…”

Section: Comparison Of Single-channel Combustorsmentioning

confidence: 99%

Effect of Different Technologies on Performance Enhancement of the Micro-Combustor for the Micro Thermophotovoltaic Application: A Review

et al. 2021

View full text Add to dashboard Cite

With the improvement and development of micro-mechanical manufacturing technology, people can produce an increasing variety of micro-electromechanical systems in recent years, such as micro-satellite thrusters, micro-sensors, micro-aircrafts, micro-medical devices, micro-pumps, and micro-motors. At present, these micro-mechatronic systems are driven by traditional energy power systems, but these traditional energy power systems have such disadvantages as short endurance time, large size, and low energy density. Therefore, efforts were made to study micro-energy dynamical systems with small size, light gravity, high density and energy, and long duration so as to provide continuous and reliable power for these systems. In general, the micro-thermal photoelectric system not only has a simple structure, but also no moving parts. The micro-thermal photoelectric system is a micro-energy power system with good application prospects at present. However, as one of the most important structural components of micro-thermal photoelectric systems, the microburner, is the key to realize the conversion of fuel chemical energy to electric energy in micro-thermal photoelectric system. The studies of how to improve the flame stability and combustion efficiency are very necessary and interesting. Thus, some methods to improve the performance of micro-burners were introduced and summarized systematically, hoping to bring some convenience to researchers in the field.

show abstract

“…In the lean premixed approach, fuel is mixed with air upstream within the mixing length. Many studies revealed that the application of the technique of premixed flames is a promising solution that can bring down the concentration of NOx by a single-digit value in ppm. − However, the conversion of the flame from the diffusion type (non-premixed) to the premixed type results in an increased levels of flame instabilities which brings its own challenges to burner designers and manufacturer. The variations in flame temperature for both conventional diffusion and DLE premixed flames are presented in Figure (left).…”

Section: Type Of Flamementioning

confidence: 99%

Review of Novel Combustion Techniques for Clean Power Production in Gas Turbines

2018

View full text Add to dashboard Cite

The tremendous increase in energy demand due to increased population and rapid economics results in an increased level of atmospheric pollutants and global warming. The global shift to the use of renewable clean energies still has some restrictions in terms of the availability of the advanced reliable technologies and the cost of application compared to conventional fossil fuels. Until we can have this full conversion to renewables, the development of novel techniques for clean combustion of fossil fuels is appreciated. Forced by the simultaneous increased pressure of strict emissions regulations and the target of limiting the global warming to 2 °C, gas turbine manufacturers developed novel combustion techniques for clean power production in gas turbines as per the present review study. These novel techniques depend either on modification in the existing combustion system or developing novel burners for clean power production. In this review, different clean combustion techniques are presented including flame type variability, burner design, and fuel and oxidizer flexibility. The combustion and emission characteristics of different flame types including non-premixed/premixed, moderate or intense low-oxygen dilution (MILD) flameless combustion, colorless distributed combustion (CDC), and low-swirl injector (LSI) combustion flames are presented with their limitations for applications. Novel burner designs for clean burning in gas turbines are investigated in detail including swirl stabilized, dry low NOx (DLN), and dry low emission (DLE), catalytic combustion, perforated plate, environmental vortex (EV), sequential environmental vortex (SEV), advanced environmental vortex (AEV), and lean direct injection (LDI) micromixer burners. As an effective technique to control combustion instabilities within the gas turbine combustor, a fuel flexibility approach is studied, considering mainly hydrogen-enriched combustion and the associated concerns about the fuel variability technique. An oxidizer flexibility approach in gas turbines is also studied under a premixed combustion mode considering lean premixed (LPM) air combustion and oxy-fuel combustion, and both techniques are compared in terms of performance and emissions. Finally, the feasibility of the different clean combustion techniques is discussed along with the available market products utilizing such novel technologies.

show abstract

Effect of micro combustor geometry on combustion and emission behavior of premixed hydrogen/air flames

Cited by 51 publications

References 59 publications

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

Effect of Different Technologies on Performance Enhancement of the Micro-Combustor for the Micro Thermophotovoltaic Application: A Review

Review of Novel Combustion Techniques for Clean Power Production in Gas Turbines

Contact Info

Product

Resources

About