28. June 2022
STORT flight experiments

Suc­cess­ful high-speed flight ex­per­i­ments with new sound­ing rock­et con­fig­u­ra­tion

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Space
Before the launch
Be­fore the launch
Image 1/3, Credit: DLR (CC BY-NC-ND 3.0)

Before the launch

The flight ex­per­i­ments on a three-stage sound­ing rock­et at the Andøya Space launch site in north­ern Nor­way.
Lift-off of the STORT flight experiment
Lift-off of the STORT flight ex­per­i­ment
Image 2/3, Credit: DLR (CC BY-NC-ND 3.0)

Lift-off of the STORT flight experiment

In the ear­ly morn­ing of 26 June 2022, the three-stage rock­et lift­ed off from the Andøya Space launch site in north­ern Nor­way. The up­per stage reached a flight speed of ap­prox­i­mate­ly 9000 kilo­me­tres per hour at the apogee of its tra­jec­to­ry – at an al­ti­tude of 38 kilo­me­tres. This cor­re­sponds to a Mach num­ber in ex­cess of eight.
Research team
Re­search team
Image 3/3, Credit: © DLR. All rights reserved

Research team

The re­search team prepar­ing the STORT ex­per­i­ments and pay­loads.
  • DLR has flown a three-stage sounding rocket for the first time.
  • High-temperature structures, measurement techniques and evaluation algorithms for the re-entry phase of reusable launchers were tested.
  • A modular and distributed data acquisition system enabled efficient collection of data from the various experiments.
  • Focus: Spaceflight, aerothermodynamics, sounding rockets

Reusable launch systems are exposed to high dynamic and thermo-mechanical loads during their return to Earth. The German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) has now successfully tested high temperature structures, advanced measurement techniques and design tools for the re-entry phase with the STORT (Schlüsseltechnologien für hochenergetische Rückkehrflüge von Trägerstufen – key technologies for high-energy return flights of launch stages) flight experiment. In the early morning of 26 June 2022, the three-stage rocket lifted off from the Andøya Space launch site in northern Norway. The upper stage reached a flight speed of approximately 9000 kilometres per hour at the apogee of its trajectory – at an altitude of 38 kilometres. This corresponds to a Mach number in excess of eight. It then descended into the Atlantic Ocean, more than 350 kilometres away from the launch site. Extensive measurement data were transmitted to the ground station during the flight.

"To achieve higher flight speeds, we used a DLR sounding rocket with three stages instead of two for the first time," explains Dorian Hargarten from the DLR Space Operations and Astronaut Training facility. "In addition, the third stage carrying various scientific payloads followed a particularly shallow trajectory at an altitude of 38 kilometres, travelling at up to eight times the speed of sound. Here, various high-temperature experiments were carried out – in circumstances similar to the heat build-up that occurs during re-entry into Earth's atmosphere – at the high thermal loads to be investigated," Hargarten continues.

Preparation of the flight experiment
Preparation of the flight experiment
Instrumented payloads consisting of the ceramic forebody, canard module, active cooling equipment segment, data acquisition unit and CFRP module ahead of the service module.

Instrumented high temperature payloads under test

Materials that can adequately withstand and dissipate high thermal loads are crucial for dealing with the thermo-mechanical loads that occurs during the re-entry phase. Robust combined aerothermal sensors for health monitoring are also essential. "In STORT, the forebody of the third stage consists of five ceramic segments," explains the Principal Investigator for the STORT project, Ali Gülhan from the DLR Institute of Aerodynamics and Flow Technology. "We equipped this with numerous heat flux sensors, thermocouples and pressure sensors every 90 degrees along four longitudinal lines and are now very excited about the data evaluation."

To carry out the thermal management experiments, the researchers used three fixed canards with ceramic outer shells. These were developed by the DLR Institute of Structures and Design. While one canard was actively cooled, the second canard was passively cooled. The third reference canard (without cooling) was also used to investigate the shock wave boundary layer interaction. The three canards showed different structural responses in flight under the same thermal load.

A modular and distributed data acquisition system enabled the efficient collection of data from the various experiments. In the predecessor project, ATEK, a standard module made of aluminium alloys was replaced by a hybrid module consisting of a CFRP structure with metal flanges to reduce the weight of the cylindrical payload segments. In the STORT project, the researchers tested an even lighter module made entirely of CFRP.

In addition to DLR, the Technical University of Munich participated in the STORT flight experiment; their contribution involved manufacturing the CFRP module. Another international partner was the University of Arizona, which carried out simulations for the 'shock wave boundary layer interaction' experiment on one of the canards. The Mobile Rocket Base (MORABA) department of the DLR Space Operations and Astronaut Training facility was responsible for planning and executing the mission. The forebody and canards were designed and manufactured by the DLR Institute of Structures and Design. The project is led by the DLR Institute of Aerodynamics and Flow Technology, which was also responsible for the aerothermal design, the active cooling experiment, instrumentation of the payloads and the modular data acquisition system.

Video: Andøya Space – DLR STORT [Launched]
DLR STORT Campaign @Andøya Space 20–30 June 2022. (T-10 sec @ 04:41:12)
Credit: YouTube / Andøya Space

About the STORT project

The flight experiment that has now been successfully carried out is one element of the STORT research project. This project is part of the DLR 'Reusable Space Transport Systems' programme. Its goal is to develop selected technologies and methods related to the thermomechanical analysis and evaluation of launch systems. For this purpose, high-temperature structures, measurement methods and evaluation algorithms developed during fundamental research were adapted for the flight experiments and qualified during the flight. As a complement to ground-based experiments, the flight data provide validation inputs for physical modelling, numerical simulations and system analysis and thus enable the reliable design and evaluation of future launcher systems. The other institutions involved in the project are the DLR Institute of Space Systems, the DLR Institute of Composite Structures and Adaptive Systems and the DLR Institute for Software Technology.

Contact
  • Falk Dambowsky
    Ed­i­tor
    Ger­man Aerospace Cen­ter (DLR)

    Com­mu­ni­ca­tions and Me­dia Re­la­tions
    Telephone: +49 2203 601-3959
    Linder Höhe
    51147 Cologne
    Contact
  • Ali Gülhan
    Ger­man Aerospace Cen­ter (DLR)
    In­sti­tute of Aero­dy­nam­ics and Flow Tech­nol­o­gy
    Su­per­son­ic and Hy­per­son­ic Tech­nol­o­gy
    Linder Höhe
    51147 Cologne
    Contact
  • Dorian Hargarten
    Ger­man Aerospace Cen­ter (DLR)
    Space Op­er­a­tions and As­tro­naut Train­ing
    Mo­bile Rock­et Base
    Münchener Straße 20
    82234 Weßling
    Contact
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CFRP

Carbon fibre reinforced plastic