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Flow characteristics of monopropellant micro-scale planar nozzles

Banuti, Daniel and Grabe, Martin and Hannemann, Klaus (2019) Flow characteristics of monopropellant micro-scale planar nozzles. Aerospace Science and Technology, 86, pp. 341-350. Elsevier. DOI: 10.1016/j.ast.2018.11.057 ISSN 1270-9638

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Official URL: https://doi.org/10.1016/j.ast.2018.11.057


We investigate the flow in planar microscale nozzles and find that design and analysis paradigms based on the assumption of a dominant isentropic core with moderate viscosity corrections are not valid. Instead, the flow downstream of the throat is dominated by boundary layers that may choke the flow to subsonic velocities. The geometrical expansion ratio is found to be essentially irrelevant, instead, the length from throat to exit plane is found to be a much more important design parameter. Full 3D simulations are required to predict the flow topology; thermophysical modeling of the expanding gas has a noticeable impact on predicted performance. An analytical estimation of the Knudsen number in the expanding flow is given, allowing to determine its values from the expansion pressure ratio. An axial thrust analysis suggest truncation of the nozzle, resulting in a predicted 20% increase in thrust and 30% increase in specific impulse compared to the baseline configuration. The work has been carried out within the European Commission co-funded PRECISE project which was focused on designing and testing a micro chemical propulsion system thruster prototype using catalytically decomposed hydrazine as propellant.

Item URL in elib:https://elib.dlr.de/123604/
Document Type:Article
Additional Information:Accepted 4 November 2018, Available online 3 January 2019
Title:Flow characteristics of monopropellant micro-scale planar nozzles
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Banuti, DanielAS-GO-RFZhttps://orcid.org/0000-0002-5469-5704
Grabe, Martinmartin.grabe (at) dlr.deUNSPECIFIED
Hannemann, Klausklaus.hannemann (at) dlr.deUNSPECIFIED
Date:3 January 2019
Journal or Publication Title:Aerospace Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.ast.2018.11.057
Page Range:pp. 341-350
Series Name:Elsevier B.V.
Keywords:MEMS, Rocket engine, Hydrazine, Cube sat, Satellite, Propulsion
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 - Wiederverwendbare Raumfahrtsysteme
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Grabe, Martin
Deposited On:22 Feb 2019 02:19
Last Modified:22 Feb 2019 02:19

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