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Flow Characteristics of Micro-Scale Planar Nozzles

Banuti, Daniel and Grabe, Martin and Hannemann, Klaus (2014) Flow Characteristics of Micro-Scale Planar Nozzles. American Institute of Aeronautics and Astronautics. 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, 2014-07-28 - 2014-07-30, Cleveland, Ohio, USA. doi: 10.2514/6.2014-4002.

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Official URL: http://arc.aiaa.org/doi/pdf/10.2514/6.2014-4002


Flow in micro chemical propulsion systems (µCPS) based on etched silicon deviates strongly from its conventional, macroscopic counterparts. This paper reports on peculiarities of small scale planar nozzles with a high aspect ratio, rectangular cross section. Design and analysis paradigms based on the assumption of rationally symmetric flow with a dominant isentropic core are shown to be no longer valid. We will point out insufficiencies of treating planar nozzles as two dimensional, inviscid, or assessing their performance with classical analytical isentropic 1D analysis. Instead, the resulting low Reynolds number flow is boundary layer dominated. Boundary layer build-up from the top and bottom walls threaten to choke the expansion. The geometrical expansion ratio is found to be essentially irrelevant, the length from throat to exit plane is found to be a much more important design parameter. The work has been carried out within the European PRECISE project which is focused on designing and testing a prototype using catalytically decomposed hydrazine as propellant.

Item URL in elib:https://elib.dlr.de/89455/
Document Type:Conference or Workshop Item (Speech)
Title:Flow Characteristics of Micro-Scale Planar Nozzles
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Grabe, MartinUNSPECIFIEDhttps://orcid.org/0000-0003-0361-2734UNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-8
Publisher:American Institute of Aeronautics and Astronautics
Series Name:Conference Proceedings online
Keywords:CFD, nozzle, MEMS
Event Title:50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference
Event Location:Cleveland, Ohio, USA
Event Type:international Conference
Event Start Date:28 July 2014
Event End Date:30 July 2014
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 - EU Projekte Raumtransport (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Micknaus, Ilka
Deposited On:18 Aug 2014 08:58
Last Modified:24 Apr 2024 19:55

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