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Particle mass flow determination in dust laden supersonic flows by means of simultaneous application of optical measurement techniques

Allofs, Dirk and Neeb, Dominik and Gülhan, Ali (2023) Particle mass flow determination in dust laden supersonic flows by means of simultaneous application of optical measurement techniques. Experiments in Fluids, 64. Springer Nature. doi: 10.1007/s00348-022-03567-7. ISSN 0723-4864.

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Official URL: https://link.springer.com/article/10.1007/s00348-022-03567-7


Particle mass flow rate and particle mass concentration are key parameters for describing two-phase flows, especially for particle-induced heating augmentation analysis. This work addresses the question of how accurate particle mass flow rate can be determined with three non-intrusive measurement approaches, based on shadowgraphy, particle tracking velocimetry (PTV), and scattered light intensity, in supersonic flows. In terms of shadowgraphy and PTV, the particle mass flow rate was determined by measuring individual particle characteristics, namely particle size, velocity, and density, as well as the measurement volume. The presented shadowgraphy procedure is based on the commercial LaVision DaVis software and additional shadowgraphy corrections. Multiple tests were conducted in the experimental test facility GBK of DLR with varying flow conditions, at a Mach number of 2.1, unit Reynolds number (Re∞) ranging from 5e7 1/m to 1.5e8 1/m, total temperature (T0) ranging from 303 to 544 K, and particle materials, namely Al2O3, MgO, and SiO2, in the size range of 1 to 60 µm. Particle size distributions of Al2O3 and MgO particles could be reproduced with shadowgraphy quite well, while the PTV procedure resulted in non-similar distributions. Pycnometer measurements indicated MgO particle density to be significantly lower than reference values. A DaVis parameter variation analysis resulted in a particle mass flow rate uncertainty of shadowgraphy of up to 30%. The particle mass flow rate uncertainty of PTV is approx. 76%, and the respective uncertainty of scaled PTV and scattered light intensity approach is 28%. The particle mass flow rate, measured with shadowgraphy, is 58% higher than those of the semi-axisymmetric scattered light intensity approach, which can be explained by a higher particle concentration at the injection plane.

Item URL in elib:https://elib.dlr.de/200840/
Document Type:Article
Title:Particle mass flow determination in dust laden supersonic flows by means of simultaneous application of optical measurement techniques
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Allofs, DirkUNSPECIFIEDhttps://orcid.org/0000-0002-3776-1853UNSPECIFIED
Neeb, DominikUNSPECIFIEDhttps://orcid.org/0000-0002-5848-3055UNSPECIFIED
Gülhan, AliUNSPECIFIEDhttps://orcid.org/0000-0003-4905-5881UNSPECIFIED
Date:21 February 2023
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:Springer Nature
Keywords:Particle size, velocity, number concentration, two phase flows, dust laden flows, supersonic flows, Particle Image Velocimetry, PIV, Shadowgraphy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - XTRAS - EXperTiese RAumtranSport
Location: Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Supersonic and Hypersonic Technology
Deposited By: Allofs, Dirk
Deposited On:14 Dec 2023 09:27
Last Modified:14 Dec 2023 09:27

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