Experimental study on thermoacoustic instability and emission characteristics of premixed swirl flame in a longitudinal combustor

2022 ◽  
Vol 172 ◽  
pp. 107354
Author(s):  
Zhibo Cao ◽  
Yinli Xiao ◽  
Wenyan Song ◽  
Wengang Li
Keyword(s):  
Experimental Study ◽  
Emission Characteristics ◽  
Thermoacoustic Instability ◽  
Swirl Flame

Swirl Flame Response to Simultaneous Axial and Transverse Velocity Fluctuations

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Aditya Saurabh ◽  
Jonas P. Moeck ◽  
Christian Oliver Paschereit
Keyword(s):  
Experimental Study ◽  
Relative Phase ◽  
Transverse Velocity ◽  
Acoustic Velocity ◽  
Velocity Fluctuations ◽  
Thermoacoustic Instability ◽  
Transverse Acoustic ◽  
Flame Response ◽  
Swirl Flame ◽  
The Impact

In this experimental study, we investigate the impact of transverse acoustic velocity fluctuations on flame response to axial velocity fluctuations. Such a scenario where a flame is under the influence of a 2D acoustic field occurs in annular gas turbine combustors during thermoacoustic instability. A generic premixed swirl flame is exposed to simultaneous transverse and axial acoustic forcing. The amplitude of axial forcing was kept constant, while the amplitude and relative phase (with respect to axial forcing) of the transverse forcing was systematically varied. Results obtained indicate that transverse velocity affects flame response, and that both the magnitude of transverse velocity and its phase with respect to axial forcing are important factors.

scholarly journals Emission Characteristics for Swirl Methane–Air Premixed Flames with Ammonia Addition

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 662
Author(s):  
Joanna Jójka ◽  
Rafał Ślefarski
Keyword(s):  
Equivalence Ratio ◽  
Combustion Process ◽  
Great Influence ◽  
Emission Characteristics ◽  
Firing Rates ◽  
Numerical Tests ◽  
Ammonia Addition ◽  
Swirl Flame ◽  
Reactor Network ◽  
No Emissions

This paper details the experimental and numerical analysis of a combustion process for atmospheric swirl burners using methane with added ammonia as fuel. The research was carried out for lean methane–air mixtures, which were doped with ammonia up to 5% and preheated up to 473 K. A flow with internal recirculation was induced by burners with different outflow angles from swirling blades, 30° and 50°, where tested equivalence ratio was 0.71. The NO and CO distribution profiles on specified axial positions of the combustor and the overall emission levels at the combustor outlet were measured and compared to a modelled outcome. The highest values of the NO emissions were collected for 5% NH3 and 50° (1950 ppmv), while a reduction to 1585 ppmv was observed at 30°. The doubling of the firing rates from 15 kW up to 30 kW did not have any great influence on the overall emissions. The emission trend lines were not proportional to the raising share of the ammonia in the fuel. 3D numerical tests and a kinetic study with a reactor network showed that the NO outlet concentration for swirl flame depended on the recirculation ratio, residence time, wall temperature, and the mechanism used. Those parameters need to be carefully defined in order to get highly accurate NO predictions—both for 3D simulations and simplified reactor-based models.

Experimental study of ignition, lift-off length and emission characteristics of diesel/hydrogenated catalytic biodiesel blends

2019 ◽  
Vol 235 ◽  
pp. 641-652 ◽  
Author(s):  
Wenjun Zhong ◽  
Tamilselvan Pachiannan ◽  
Zhixia He ◽  
Tiemin Xuan ◽  
Qian Wang
Keyword(s):  
Experimental Study ◽  
Emission Characteristics ◽  
Biodiesel Blends ◽  
Lift Off

scholarly journals Adaptation of Methanol–Dodecanol–Diesel Blend in Diesel Genset Engine

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Avinash Kumar Agarwal ◽  
Nikhil Sharma ◽  
Akhilendra Pratap Singh ◽  
Vikram Kumar ◽  
Dev Prakash Satsangi ◽  
...  
Keyword(s):  
Experimental Study ◽  
Fuel Additive ◽  
Particulate Emissions ◽  
Emission Characteristics ◽  
Nox Emissions ◽  
Compression Ignition ◽  
Performance And Emission ◽  
Combustion Performance ◽  
Compression Ignition Engines ◽  
Single Cylinder Engine

Miscibility of methanol in mineral diesel and stability of methanol–diesel blends are the main obstacles faced in the utilization of methanol in compression ignition engines. In this experimental study, combustion, performance, emissions, and particulate characteristics of a single-cylinder engine fueled with MD10 (10% v/v methanol blended with 90% v/v mineral diesel) and MD15 (15% v/v methanol blended with 85% v/v mineral diesel) are compared with baseline mineral diesel using a fuel additive (1-dodecanol). The results indicated that methanol blending with mineral diesel resulted in superior combustion, performance, and emission characteristics compared with baseline mineral diesel. MD15 emitted lesser number of particulates and NOx emissions compared with MD10 and mineral diesel. This investigation demonstrated that methanol–diesel blends stabilized using suitable additives can resolve several issues of diesel engines, improve their thermal efficiency, and reduce NOx and particulate emissions simultaneously.

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