Flame imaging using planar laser induced fluorescence of sulfur dioxide

Honza, Rene; Ding, Carl-Philipp; Dreizler, Andreas; Böhm, Benjamin

doi:10.1007/s00340-017-6823-7

Cited by 23 publications

(10 citation statements)

References 16 publications

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“…fluorescence shows a strong increase with temperature upon excitation with UV light [16]. This has already been successfully demonstrated for flame imaging in engines [17]. The FOV is slightly offset from the cylinder axis towards the spark plug where the flame can be studied during its early development phase.…”

Section: Enginementioning

confidence: 80%

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Flame/flow dynamics at the piston surface of an IC engine measured by high-speed PLIF and PTV

Ding

Peterson

Schmidt

et al. 2019

Proceedings of the Combustion Institute

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Resolving fluid transport at engine surfaces is required to predict transient heat loss, which is becoming increasingly important for the development of high-efficiency internal combustion engines (ICE). The limited number of available investigations have focused on non-reacting flows near engine surfaces, while this work focuses on the near-wall flow field dynamics in response to a propagating flame front. Flow-field and flame distributions were measured simultaneously at kHz repetition rates using particle tracking velocimetry (PTV) and planar laser induced fluorescence (PLIF) of sulfur dioxide (SO2). Measurements were performed near the piston surface of an optically accessible engine operating at 800 rpm with homogeneous, stoichiometric isooctane-air mixtures. High-speed measurements reveal a strong interdependency between near-wall flow and flame development which also influences subsequent combustion. A conditional analysis is performed to analyze flame/flow dynamics at the piston surface for cycles with 'weak' and 'strong' flow velocities parallel to the surface. Faster flame propagation associated with higher velocities before ignition demonstrates a stronger flow acceleration ahead of the flame. Flow acceleration associated with an advancing flame front is a transient feature that strongly influences boundary layer development. The distance from the wall to 75% maximum velocity (δ75) is analyzed to compare boundary layer development between fired and motored datasets. Decreases in δ75 are strongly related to flow acceleration produced by an approaching flame front. Measurements reveal strong deviations of the boundary layer flow between fired and motored datasets, emphasizing the need to consider transient flow behavior when modelling boundary layer physics for reacting flows.

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Section: Enginementioning

confidence: 80%

“…SO2 fluorescence shows a strong increase with temperature upon excitation with UV light [16]. This has already been successfully demonstrated for flame imaging in engines [17]. SO2 was seeded into the intake air at a concentration of 1.1vol% SO2 corrective lens was used to correct optical aberrations induced by the cylinder glass [18].…”

Section: Enginementioning

confidence: 99%

Flame/flow dynamics at the piston surface of an IC engine measured by high-speed PLIF and PTV

Ding

Peterson

Schmidt

et al. 2019

Proceedings of the Combustion Institute

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show abstract

“…Background correction was applied using the signal of three non-fired cycles aquired directly after the fired measurements. The SO 2 signal is insensitive to the observed temperature changes in the unburnt gas region (Honza et al 2017) and increases by a factor of 2 to 5 from the unburnt to the burned gas region. A sheet correction was performed when the flame filled the FOV.…”

Section: Data Processingmentioning

confidence: 99%

“…For flame imaging, PLIF of the inert tracer SO 2 was used. The fluorescence of SO 2 has been proven to be a good flame marker since it increases with the local gas temperature (Honza et al 2017). High-speed SO 2 -LIF is preferable to OH-LIF, especially at elevated pressures, because the pulse energy of high-speed dye lasers is still limited and results in a low signal-to-noise ratio.…”

Section: Engine and Operating Conditionsmentioning

confidence: 99%

Near-Wall Flame and Flow Measurements in an Optically Accessible SI Engine

Schmidt

Ding

Peterson

et al. 2020

Flow Turbulence Combust

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Near-wall processes in internal combustion engines strongly affect heat transfer and pollutant emissions. With continuously improving capabilities to model near-wall processes, the demand for corresponding measurements increases. To obtain an in-depth understanding of the near-wall processes within spark-ignition engines, flame distributions and flow fields were measured simultaneously near the piston surface of an optically accessible engine operating with homogeneous, stoichiometric isooctane-air mixtures. The engine was operated at two engine speeds (800 rpm and 1500 rpm) and two different intake pressures (0.95 bar and 0.4 bar). Flame distributions were obtained at high spatial resolution using high-speed planar laser induced fluorescence of sulfur dioxide (SO 2). Particle tracking velocimetry was utilized to measure the flow field above the piston at high spatial resolution, which enabled the determination of hydrodynamic boundary layer profiles. Flame contours were extracted and statistical distributions of the burnt gas area determined. The burnt gas distributions were compared with the simultaneously recorded high-speed flow field measurements in the unburnt gas. A direct comparison with motored engine operation showed comparable boundary layer profiles until the flame approaches the wall. Flow acceleration due to flame expansion rapidly increases velocity gradients and the boundary layer development becomes highly transient. The interaction of flame and flow depends on the operating conditions, which results in a different evolution of burnt gas positions within the field-of-view. This has additional implications on the development of the velocity boundary layer. Depending on the operating conditions, the flame strongly affects the velocity boundary layer profiles resulting in boundary layer thicknesses (defined by 50% maximum velocity) in the order of 80−180 μm.

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“…Vanyai et al [106] did an experiment on thermal compression scramjet based on OH imaging [107], and found that such three-dimensional air inlet of supersonic ramjet can generate pressure and temperature gradients of the fluid. The combustion of any part of the combustor was suppressed by injecting combustion fuel, hydrogen, or non-combusting helium to check how the combustion of these parts affected the pressure and temperature of the entire flow field, the concentration and production of OH radicals was depicted by OH chemiluminescence and planar laser induction fluorescence (PLIF) images see ( Figure 29) [108] so as to detect the chemical activity throughout the entire combustion process. The experimental results show that thermal compression is an effective method to increase the combustion pressure of scramjets, and thermal compression can effectively increase the chemical activity of the fuel and thereby the thrust of the engine can be improved.…”

Section: Thermal Control Systemsmentioning

confidence: 99%

Thermal Protection System and Thermal Management for Combined-Cycle Engine: Review and Prospects

et al. 2019

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Combined-cycle engine is a potential propulsion system for hypersonic aircraft. To ensure long-term, normal operation of combined-cycle engine under the harsh environment of high thermal load, it is of great significance to study the thermal protection and management of the propulsion system. In this study, the objective and development status of thermal protection and thermal management systems for the combined-cycle propulsion system were described. The latest research progresses of thermal protection, thermal barrier coating, and thermal management system of the combined-cycle propulsion system were summarized. Moreover, the problems and shortcoming in current researches were summarized. In addition, a prospect for the future development of thermal protection and management of the combined-cycle propulsion system was presented, pointing out a direction of great value and vital research significance to thermal protection and management of the combined-cycle propulsion system.

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Flame imaging using planar laser induced fluorescence of sulfur dioxide

Cited by 23 publications

References 16 publications

Flame/flow dynamics at the piston surface of an IC engine measured by high-speed PLIF and PTV

Flame/flow dynamics at the piston surface of an IC engine measured by high-speed PLIF and PTV

Near-Wall Flame and Flow Measurements in an Optically Accessible SI Engine

Thermal Protection System and Thermal Management for Combined-Cycle Engine: Review and Prospects

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