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Modeling of the Transformation Kinetics of Small Metal Particles during Combustion inside the Chamber of Hybrid Rocket Engines

Bozic, Ognjan and Mokhtari Molk Abadi, Noushin and Poppe, Georg and May, Stefan (2015) Modeling of the Transformation Kinetics of Small Metal Particles during Combustion inside the Chamber of Hybrid Rocket Engines. 6th EUCASS 2015, 29. June – 2. July 2015, Krakow, Poland.

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Abstract

Metal powders as fuel ingredients of hybrid rocket motors are an important factor which can improve the engine properties. Through the fuel density increase, a compact engine form can be achieved and the construction mass ratio can be reduced. Furthermore, the addition of metal powders in the fuel structure can increase the regression rate, the combustion temperature and the corresponding specific impulse. But to achieve these goals, the combustion efficiency of metal particles must be high and the condensation of metal droplets, high particle agglomeration, the combustor wall slagging as well as the nozzle structure abrasion must be reduced or completely avoided. The challenging experiments with hybrid rocket engines (HRE) deliver a limited amount of information necessary to understand transformation mechanisms, despite of the application of sophisticated measurement techniques. So, the experiments should be combined with CFD multiphase simulations to enable understanding of combustion processes related to the condensed flow phase. Subsequently, this enables the management of the combustion process within HRE as well as the avoidance of negative effects by the application of powder ingredients with metal content. Within the AHRES (Advanced Hybrid Rocket Engine Simulation) program, the DLR Institute of Aerodynamics and Flow Technology in Braunschweig has carried out experiments with different fuel formulations, which included metal powders of aluminum and aluminum-magnesium alloys. Additionally, the transformation loop of small particles with metal content is simulated using an Euler-Lagrange coupling of the reacting gas flow and the condensed metallic phase. The conducted simulation includes time dependent transformations of Al and AlH3 particles (decomposition, melting, vaporization, heterogeneous combustion, condensation and solidification). In this paper, the used transformation models and the coupling procedure between the gas and the condensed phase are classified and explained. For given start and boundary conditions one simulation of the characteristic small single metal particles with corresponding trajectories is realized. The results are graphically displayed and extensively commented. They enable helpful conclusions about the utilization of metal particles as fuel ingredients for HRE.

Item URL in elib:https://elib.dlr.de/100287/
Document Type:Conference or Workshop Item (Lecture, Speech)
Title:Modeling of the Transformation Kinetics of Small Metal Particles during Combustion inside the Chamber of Hybrid Rocket Engines
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bozic, Ognjanognjan.bozic (at) dlr.deUNSPECIFIED
Mokhtari Molk Abadi, NoushinNoushin1 (at) gmx.netUNSPECIFIED
Poppe, Georggeorg.poppe (at) dlr.deUNSPECIFIED
May, Stefanstefan.may (at) dlr.deUNSPECIFIED
Date:July 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:hybrid rocket engine, CFD simulations, multi-phase flow combustion, condensed phase, metal particle kinetic
Event Title:6th EUCASS 2015
Event Location:Krakow, Poland
Event Type:international Conference
Event Dates:29. June – 2. July 2015
Organizer:EUCASS - The european conference for aero-space sciences
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Vorhaben AHRES (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Bozic, Dr.-Ing. Ognjan
Deposited On:09 Dec 2015 13:23
Last Modified:09 Dec 2015 13:23

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