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Numerical Investigation of Side-Effects due to Fuel Outflow from Secondary Nozzles in Bleed Engine and Gas Generator Cycles of a Retro Propulsion-Assisted Launch Vehicle

Feldner, Yannik and Ertl, Moritz and Ecker, Tobias and Karl, Sebastian (2023) Numerical Investigation of Side-Effects due to Fuel Outflow from Secondary Nozzles in Bleed Engine and Gas Generator Cycles of a Retro Propulsion-Assisted Launch Vehicle. In: 10th EUCASS - 9th CEAS 2023, pp. 1-14. 10th EUCASS - 9th CEAS 2023, 2023-07-09 - 2023-07-13, Lausanne. doi: 10.13009/EUCASS2023-595.

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Official URL: https://www.eucass.eu/doi/EUCASS2023-595.pdf

Abstract

Reusable launch vehicles (RLV) have the potential to be a resource- and cost-efficient alternative to conventional space transport systems. Several first stages of RLVs are in the maturing process and the European long term strategy aims towards the development and characterization of RLV relevant technologies for their next generation of launchers. We are basing our studies on the EU funded Retro Propulsion Assisted Landing Technologies (RETALT) project, which was formed with the goal of investigating Vertical Take-off Vertical Landing (VTVL) launch vehicles. In this paper, the first stage of the VTVL Two Stage to Orbit (TSTO) RETALT1 configuration will be used for the assessment of thermal loads during the flight trajectory. The mission plan for the first stage of the RETALT1-vehicle is to return either to the launch pad or a drone ship via a re-entry burn and a retro propulsion maneuver. During this retro propulsion phase high thermal loads are acting on the rocket structure and especially the landing legs, the base plate and the aerodynamic control surfaces. These thermal loads due to the main engine exhaust of the RLV have been characterized in previous studies by Laureti et al. Only little research has been devoted to the topic of post combustion due to the outflow of gas generators and air vents of cryogenic fuel tanks in VTVL-configurations in general. Owing to these secondary exhaust jets, unburned hydrogen is ejected near the high temperature outflow of the main engines, which could lead to a significant post combustion with the surrounding atmospheric oxygen and deviating thermal loads along the vital parts of the rocket structure. In order to provide an assessment of the additional influence of the post combustion and thermal loads, Computational Fluid Dynamics (CFD) simulations are carried out using the DLR-TAU code with the Reynolds Averaged Navier Stokes (RANS) method. As the post-combustion of the nozzle- and gasgenerator-outflow is to be observed, a reduced Jachimowsky mechanism for a species mixture of the liquid hydrogen, liquid oxygen combustion mixture and ambient air is applied as chemistry model. In this publication the validity of the computational mesh by means of a GCI-study and the influence of the turbulence modeling with different approaches is to be investigated. With these results first observations of the flow field characteristics and the thermal loads acting on the RLV will be done in order to identify the simulation parameters, including crucial points along the flight trajectory for investigations of the heat flux distribution across the surface structures of the vehicle.

Item URL in elib:https://elib.dlr.de/193848/
Document Type:Conference or Workshop Item (Speech)
Title:Numerical Investigation of Side-Effects due to Fuel Outflow from Secondary Nozzles in Bleed Engine and Gas Generator Cycles of a Retro Propulsion-Assisted Launch Vehicle
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Feldner, YannikUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ertl, MoritzUNSPECIFIEDhttps://orcid.org/0000-0002-1900-5122UNSPECIFIED
Ecker, TobiasUNSPECIFIEDhttps://orcid.org/0000-0001-7134-1185UNSPECIFIED
Karl, SebastianUNSPECIFIEDhttps://orcid.org/0000-0002-5558-6673UNSPECIFIED
Date:July 2023
Journal or Publication Title:10th EUCASS - 9th CEAS 2023
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI:10.13009/EUCASS2023-595
Page Range:pp. 1-14
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
UNSPECIFIEDEUCASSUNSPECIFIEDUNSPECIFIED
UNSPECIFIEDCEASUNSPECIFIEDUNSPECIFIED
Status:Published
Keywords:CFD, RANS, Wiederverwendbare Raumfahrzeuge, RVL, Retro-Propulsion, Aerodynamik, Aerothermodynamik
Event Title:10th EUCASS - 9th CEAS 2023
Event Location:Lausanne
Event Type:international Conference
Event Start Date:9 July 2023
Event End Date:13 July 2023
Organizer:EUCASS, CEAS
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 - Project CALLISTO [RP]
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Feldner, Yannik
Deposited On:28 Jul 2023 10:06
Last Modified:24 Apr 2024 20:54

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  • Numerical Investigation of Side-Effects due to Fuel Outflow from Secondary Nozzles in Bleed Engine and Gas Generator Cycles of a Retro Propulsion-Assisted Launch Vehicle. (deposited 28 Jul 2023 10:06) [Currently Displayed]

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