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Simultaneous determination of particle size, velocity, and mass flow in dust‑laden supersonic flows

Allofs, Dirk and Neeb, Dominik and Gülhan, Ali (2022) Simultaneous determination of particle size, velocity, and mass flow in dust‑laden supersonic flows. Experiments in Fluids. Springer Nature. doi: 10.1007/s00348-022-03402-z. ISSN 0723-4864.

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Official URL: https://rdcu.be/cKf4x


The particle mass concentration and -mass flow rate are fundamental parameters for describing two-phase flows and are products of particle number, -size, -velocity, and -density. When investigating particle-induced heating augmentation, a detailed knowledge of these parameters is essential. In most of previous experimental studies considering particle-induced heating augmentation, only average particle mass flow rates are given, without any relation to measured particle sizes and -velocities within the flow or any indication of measurement uncertainty. In this work, particle number, individual particle sizes, and velocities were measured in a supersonic flow by means of shadowgraphy and particle tracking velocimetry (PTV). The goals are to determine measurement uncertainties, a particle velocity-size relation, and the spatial distribution of number, size, velocity, and mass flow rate across the nozzle exit. Experiments were conducted in a facility with a nozzle exit diameter of 30 mm, at Ma_inf = 2.1 and Re_inf = 8.2e7 1/m. Particles made of Al2O3 and up to 60 µm in size were used for seeding. Particle mass flow rates up to 50 kg/m2 s were achieved. It is shown that an additional correction procedure reduced common software uncertainties regarding shadowgraphy particle size determination from 14% to less than 6%. Discrepancies between calculated particle velocities and experimental data were found. In terms of spatial distribution, larger particles and a higher mass flow rate concentrate in the flow center. The determined particle mass flow rate uncertainty was up to 50% for PTV; for shadowgraphy, it was less than 17%.

Item URL in elib:https://elib.dlr.de/185979/
Document Type:Article
Title:Simultaneous determination of particle size, velocity, and mass flow in dust‑laden supersonic flows
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:30 March 2022
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 Image Velocimetry, PIV, Shadowgraphy, Particle Tracking Velocimetry, PTV, Supersonic, Two-Phase, Dust-Laden, Particle, Drag Modelling, GBK, Gemischbildungskanal, Micro-Nozzle, Particle Composition Cold Spray
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, R - ExoMars PanCam / MARS2020
Location: Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Supersonic and Hypersonic Technology
Deposited By: Allofs, Dirk
Deposited On:30 Sep 2022 14:23
Last Modified:27 Jun 2023 15:05

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