A5046201921- Combustion and flame dynamics
- Advanced Combustion Engine Technologies
- Radiative Heat Transfer Studies
- Optical Imaging and Spectroscopy Techniques
- Plasma Applications and Diagnostics
- Spectroscopy Techniques in Biomedical and Chemical Research
- Wind and Air Flow Studies
- Spectroscopy and Chemometric Analyses
- Photoacoustic and Ultrasonic Imaging
- Infrared Thermography in Medicine
- Non-Invasive Vital Sign Monitoring
- Combustion and Detonation Processes
- Aerosol Filtration and Electrostatic Precipitation
- Computational Fluid Dynamics and Aerodynamics
- Fire dynamics and safety research
- Rocket and propulsion systems research
- Atmospheric and Environmental Gas Dynamics
- Laser-induced spectroscopy and plasma
- Electrohydrodynamics and Fluid Dynamics
- Energetic Materials and Combustion
- Water Quality Monitoring and Analysis
- Plasma and Flow Control in Aerodynamics
- Analytical Chemistry and Sensors
- Lightning and Electromagnetic Phenomena
- Catalytic Processes in Materials Science
Lund University
2014-2024
Dantec Dynamics (Denmark)
2023
Alstom (United States)
2018
A multi-center study has been set up to accurately characterize the optical properties of diffusive liquid phantoms based on Intralipid and India ink at near-infrared (NIR) wavelengths.Nine research laboratories from six countries adopting different measurement techniques, instrumental set-ups, data analysis methods determined their best relative uncertainties dilutions prepared with common samples two compounds.By exploiting a suitable statistical model, comprehensive reference values three...
This paper presents experimental studies of the structures and burning velocities premixed ammonia/air jet flames at high Karlovitz (Ka) number conditions. Simultaneous planar laser-induced fluorescence (PLIF) imaging imidogen (NH) hydroxyl (OH) radicals was performed to investigate local flame structure Laser Doppler Anemometry (LDA) measurements were employed for extracting complement relevant turbulent quantities from flow field. All selected cases are located in regime distributed...
Methane and hydrogen-enriched (25 vol% 50 H2-enriched CH4) methane/air premixed flames were investigated in a gas turbine model combustor under atmospheric conditions. The flame operability ranges mapped at different Reynold numbers (Re), showing the dependence on Re H2 concentrations. effects of equivalence ratio (Φ), Re, enrichment structure examined employing OH-PLIF measurement. For CH4/air cases, was stabilized with an M shape; while for transitions to П shape above specific Φ. This...
The impact of pilot flame operation on the combustion pure methane and hydrogen-enriched (H2/CH4: 50/50 in vol%) fuels was investigated a gas turbine model combustor under atmospheric conditions. burner assembly designed to mimic geometry an industrial burner, Siemens DLE Burner, which concentric annular ring equipped with burners is implemented dome combustor. Two configurations have been investigated: non-premixed partially premixed arrangement. performance evaluated for varying Reynolds...
The impact of CO2 dilution on combustion syngas (a mixture H2, CO, and CH4) was investigated in a lab-scale gas turbine model combustor at atmospheric pressure conditions. Two mild levels CO2, corresponding to 15% 34% mole fraction the syngas/CO2 mixtures, were experimentally evaluate effects flame structures emissions CO NOx. All experiments performed constant Reynolds number (Re = 10000). High-speed luminescence, simultaneous planar laser-induced fluorescence (PLIF) measurements OH...
We present extended spectroscopic analysis of pharmaceutical tablets in the close near infrared spectral range performed using broadband photon time-of-flight (PTOF) absorption and scattering spectra measurements. show that can be used to perform evaluation chemical composition without need for chemo-metric calibration. The was an advanced PTOF spectrometer operating 650 1400 nm range. By employing temporal stabilization system we achieve high precision 0.5% required evaluate concentration...
Turbulent premixed flames subjected to extreme levels of turbulence exhibit reaction zone broadening and thinning. Instantaneous flame structures visualized using advanced laser diagnostic methods have shown significantly different behaviours flame/turbulence interaction in jet stabilized on burners sizes. This paper aims reconcile the controversy about Premixed ammonia/air are investigated owing importance ammonia future carbon-free energy system. Due low laminar speed mixture, intensity...
The use of aluminum-magnesium (Al-Mg) alloy particle as energetic additive in solid propellants was previously shown to have many advantages over pure Al particle, such relatively low ignition temperature, high reaction rate and agglomeration rate. In this paper, the combustion Al-Mg hot H2O/O2/N2 flows experimentally studied using wires with a diameter 200 µm. employment instead particles provided unique opportunity obtain fundamental insights into process due spatial stabilization large...
In this paper, we present, for the first time, absorption and reduced scattering spectra of commercially available milk yoghurt products, obtained using photon-time-of-flight spectroscopy. The ability technique to separate contributions from in sample provides important information on chemical composition micro-structural properties, which are not with traditional techniques used dairy production. instrument operates spectral range 500 nm 1030 nm. coefficient varies 5 cm −1 0.1% fat near...
Experimental and numerical studies were performed to understand the stabilization of lean premixed natural gas/air flames in a gas turbine model combustor which was equipped with swirl burner, known as CECOST designed replicate flow flame structures an industrial engine. The operability range, stabilization, flashback investigated employing simultaneous OH– CH2O-PLIF, high-speed chemiluminescence imaging. Large eddy simulation (LES) carried out for analysis vortex breakdown under...
This work investigates the impact of pilot flame and fuel composition on structures stabilization swirling turbulent premixed methane/hydrogen/air flames in a lab-scale gas turbine model combustor. Simultaneous measurements velocity field OH radicals distribution combustor were conducted using particle imaging velocimetry (PIV) planar laser-induced fluorescence (PLIF) methods, respectively. Flames under stable close to lean blow-off (LBO) conditions studied for two mixtures, with hydrogen...
Abstract In this work, numerical investigations were performed using large eddy simulations and validated against detailed measurements in the CeCOST swirl stabilised burner. Both cold reactive flow have been studied model has shown a good agreement with experiments. The verification of was done LES index quality single grid estimator. predicted results closely to experiments setting baseline for simulations. Coherent structures like vortex rope above swirler precessing core combustion...
Clean technology has become a key feature due to increasing environmental concerns. Swirling flows, being directly associated with combustion performance and hence minimized pollutant formation, are encountered in most propulsion power-generation devices. In this study, the development process of conceptual swirl burner developed at Swedish National Centre for Combustion Technology (CeCOST), is presented. Utilizing extensive computational fluid dynamics (CFD) analysis, both lead time cost...
Photon time-of-flight (PTOF) spectroscopy enables the estimation of absorption and reduced scattering coefficients turbid media by measuring propagation time short light pulses through medium. The present investigation provides a comparison assessed from PTOF measurements intralipid 20% India ink-based optical phantoms covering wide range properties relevant for biological tissues dairy products. Three different models are used to obtain fitting measured temporal profiles: Liemert-Kienle...
The surface temperature of a burner nozzle using three different pilot hardware configurations was measured lifetime phosphor thermometry with the ZnS:Ag in gas turbine model combustor designed to mimic Siemens DLE (Dry Low Emission) burner. included non-premixed injection setup and two partially premixed injections where one had relatively higher degree premixing. For each configuration, operated either methane or hydrogen-enriched (H2/CH4: 50/50 volume %). local heating from flames much...
Experiments were performed on a prototype 4th generation DLE (dry low emission) burner under atmospheric pressure conditions to investigate the effects of hydrogen (H2) enrichment methane (CH4) flames. The assembly was designed have three concentrically arranged premixed sections: an outer Main section, intermediate section (Pilot) and central pilot body termed RPL (Rich-Pilot-Lean) section. Planar laser-induced fluorescence (PLIF) OH radicals together with flame chemiluminescence imaging...
Abstract Fuel and load flexibility have been increasingly important features of industrial gas turbines in order to meet the demand for increased utilization renewable fuels provide a way balance grid fluctuations due unsteady supply wind solar power. Experimental investigations were performed using standard third-generation dry low emission (DLE) burner under atmospheric pressure conditions study effect central pilot fuel addition, variations, hydrogen (H2) enrichment natural (NG) flame....
Plasma assisted combustion has been proposed as an efficient technique to enhance combustion, especially under the extreme conditions. For shedding light on interactions between plasma and turbulent flame at extended conditions, a burner design with integrated electrodes was used couple non-thermal gliding arc (GA) discharge flame. The morphology dynamic behaviors of GA flow rates gas temperatures were investigated by high-speed video imaging. It is found that two distinct types (named Flame...
Laser based investigations were performed on a prototype 4th generation DLE (dry low emission) burner under atmospheric pressure conditions to study the effects of changing geometry flame. In full configuration, divergent conical section termed Quarl is located after exit for expanding flow area and holding The planar laser-induced fluorescence (PLIF) OH radicals together with flame chemiluminescence imaging employed characteristics without using CH4 as fuel understand influence When there...
In the present work, a downscaled prototype 4th generation Dry Low Emission gas turbine (SGT-750) burner (designed and manufactured by Siemens Industrial Turbomachinery AB, Sweden) was investigated using an atmospheric experimental facility. The primary purpose of research is to analyze flame stability emission capability burner. OH Planar Laser-Induced Fluorescence (OH-PLIF), chemiluminescence imaging were performed characterize structure location. From OH-PLIF images, reaction zone post...
The effect of a rotating gliding arc (RGA) plasma discharge on the flame in downscaled Siemens Energy dry low emission, SGT-750, burner was experimentally investigated under atmospheric combustion conditions. central pilot section burner, named RPL (rich-pilot-lean), redesigned with an integrated high-voltage electrode to generate RGA. exhaust gas sampled and analyzed terms CO emissions, emission data show that RGA extends lean blowout limit. High-speed OH chemiluminescence imaging employed...
The hysteretic behavior of flashback (FB) and flash forward (FF) in methane natural gas flames, stabilized by a low swirl fuel injector, is investigated using high speed OH* chemiluminescence particle image velocimetry. Due to the lack vortex breakdown, two mechanisms discussed are boundary layer turbulence induced FB. Two hysteresis cycles were identified, one when FB increasing equivalence ratio starting from lean conditions, other decreasing rich conditions. Impact relevant parameters...
Lean premixed dry low emission (DLE) combustion system in a gas turbine engine is globally accepted concept to reduce pollutant emissions and improve efficiency. This study focused on an industrial downscaled prototype burner (4th Generation Dry Low Emission Burner for SGT-750 designed manufactured by Siemens Industrial Turbo machinery AB), which has been tested extensively at atmospheric conditions. To enhance the operability alleviate flame dynamics behavior, multiple fuel air circuits...