Experimental investigation of particle-laden flows in an oxy-coal combustion chamber for non-reacting conditions

Becker, Lukas; Langenthal, Thomas von; Pielsticker, Stefan; Böhm, Benjamin; Kneer, Reinhold; Dreizler, Andreas

doi:10.1016/j.fuel.2018.08.076

Cited by 19 publications

(13 citation statements)

References 16 publications

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“…The phase separation method in this work is adapted from previous work from Khalitov and Longmire [12] and Becker et al [15] with differences in the particle detection to cope with varying background light intensities and seeding densities in the reacting environment.…”

Section: Phase Separationmentioning

confidence: 99%

“…This means that the phase separation needs to be calibrated and validated for every application case. A reliable way to do so is to use artificial two-phase PIV pictures with the same optical properties as the examined case [12,15].…”

Section: Calibration and Validationmentioning

confidence: 99%

“…Application of these techniques to combustion systems is not common. So far, there are investigations of the particleladen flow in model coal combustors at non-reactive conditions [15] The scope of this work is to apply the two-phase PIV phase separation methods and adapt them for the application in kerosene spray flames, to test their applicability and to study the two-phase flow characteristics close to the fuel nozzle in a laboratory scale aero-engine combustor.…”

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confidence: 99%

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Experimental Two-Phase Flow Analysis Inside a Laboratory Scale Jet-Engine Combustion Chamber Using PIV

Langenthal

Zarzalis

Loukou

2020

Volume 4A: Combustion, Fuels, and Emissions

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The characterization of the two-phase kerosene/air flow near the nozzle of an aero engine combustor is important in order to understand the combustion characteristics of the burner. Typically, Particle Image Velocimetry (PIV) or Laser Doppler Velocimetry (LDV) is used to measure velocities inside aero engine combustors. However, these measurement techniques rely on tracer particles to visualize the flow field and are usually only able to measure the velocity field of one phase at a time. In the case of PIV measurements both the flow tracers and the kerosene droplets scatter the laser light and thus, appear on the PIV recordings. Depending on droplet size and flow velocity, these kerosene droplets do not necessarily follow the airflow leading to errors in the derived velocity field. This work presents a method on how to separate kerosene droplets from flow tracers depending on their optical characteristics in the PIV recording. This phase separation enables the independent measurement of the flow fields of both the gaseous and liquid phase at the same time using a standard PIV setup. The method is demonstrated on a laboratory scale aero engine combustor operated at atmospheric conditions. The test rig features liquid kerosene combustion with realistic inlet temperatures and pressure drop as well as good access for optical measurement techniques. The phases are separated by filtering the images with noise reduction filters for suppressing the signal of the flow tracers, and edge detection filters to detect the kerosene droplets. The detected kerosene droplets are removed from the PIV pictures and the pictures are evaluated using standard PIV cross-correlation. Afterwards the liquid phase images are evaluated using Particle Tracking Velocimetry (PTV). This phase separation can lead to errors in the derived velocity fields because of incorrect and incomplete particle detection or due to errors in the cross correlation at the edges of detected particles. These errors in the phase separation are quantified by evaluating artificial two-phase flow PIV pictures with similar optical properties to the actual two-phase PIV pictures, and comparing the derived velocity fields to the results calculated using the original, unaltered pictures. The obtained results show, that in the setup under investigation, gaseous and liquid phase can have significantly different flow fields with kerosene droplets moving in the opposite direction of the recirculating airflow. The influence of essential parameters like seeding and spray density are discussed and at positions with a sufficient data rate, the instantaneous slip velocity between droplets and gaseous flow is calculated. Generally, the presented method appears to be suitable for studying combustion with liquid kerosene injection.

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Section: Phase Separationmentioning

confidence: 99%

Section: Calibration and Validationmentioning

confidence: 99%

mentioning

confidence: 99%

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Experimental Two-Phase Flow Analysis Inside a Laboratory Scale Jet-Engine Combustion Chamber Using PIV

Langenthal

Zarzalis

Loukou

2020

Volume 4A: Combustion, Fuels, and Emissions

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“…Simultaneous measurement of gas-and particle-phase velocities is of vital importance to advance understanding of the complex interactions between the two phases in particle-laden flows. This understanding is important because the instantaneous gas-particle distributions can influence phenomena such as mass transport, ignition, combustion, heat transfer, chemical reactions and dust diffusion [4,5,15,16], which in turn have significant effects on thermal efficiencies and pollutant emissions within the many industrial systems involve the use of particles. This paper presents a proof-ofconcept of a method to enable measurements of the velocity field of both phases within time-frames that are short relative to any fluid time-scales utilising laser-induced fluorescence and phosphorescence.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, many different methods have been developed to reduce the cross-interference between particles and tracers, such as establishing a thresholding between phases [19], applying an object-growing algorithm [18], using the medianfilter [9] or the Wiener filter [4] in image processing, utilising a spectral atomic filter or developing very-high-resolution PIV systems [22]. While these methods have improved the conventional PIV technique, they also exhibit limitations, such as still yielding some cross-interferences, requiring expensive processing cost or requiring complicated experiments.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous planar measurements of gas and particle velocities in particle-laden flows: proof-of-concept

Bi¹,

Sun²,

Lau³

et al. 2020

Australasian Fluid Mechanics Conference (AFMC)

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A laser-based technique is reported, employing simultaneous laser-induced fluorescence (LIF) and phosphorescence (LIP) to respectively mark the gas-and particle-phases and allow their simultaneous velocity measurement in a particle-laden flow. The technique discriminates the phases by optically separating the fluorescent and phosphorescent signals from each other and also from the scattering signals, thorough the novel use of optical filters and temporal separation. A proof-of-concept demonstration was conducted with using 250 μm PMMA spherical particles and 4 μm BAM:Eu 2+ phosphorescent tracers, suspended in a water cuvette. Under 355 nm excitation (3 rd harmonic of the Nd:YAG laser), both PMMA fluorescent and BAM:Eu 2+ phosphorescent signals are shown to be sufficiently strong for imaging with CCD cameras, and sufficiently separable with using spectral filters and temporal profiles.

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In-situ study on flow and rotation behaviors of coal particles near the burner plane in an impinging entrained-flow gasifier

Lu,

Gong,

Guo

et al. 2024

Applied Energy

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Experimental investigation of particle-laden flows in an oxy-coal combustion chamber for non-reacting conditions

Cited by 19 publications

References 16 publications

Experimental Two-Phase Flow Analysis Inside a Laboratory Scale Jet-Engine Combustion Chamber Using PIV

Experimental Two-Phase Flow Analysis Inside a Laboratory Scale Jet-Engine Combustion Chamber Using PIV

Simultaneous planar measurements of gas and particle velocities in particle-laden flows: proof-of-concept

In-situ study on flow and rotation behaviors of coal particles near the burner plane in an impinging entrained-flow gasifier

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