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Comissioning of a Ludwieg Tube in DLR Göttingen

Goh, Qi Xuan and Surujhlal, Divek (2023) Comissioning of a Ludwieg Tube in DLR Göttingen. In: STAB Jahresbericht 2023 zum 21. STAB Workshop, pp. 164-165. 21. STAB - Workshop 2023, 2023-11-07 - 2023-11-08, Göttingen, Germany.

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Official URL: https://www.dlr.de/as/Portaldata/5/Resources/dokumente/veranstaltungen/stab_workshop/Jahresbericht2023.pdf


The HHK4 is a Ludwieg tube that has been relocated from TU Dresden to DLR Göttingen and is currently being commissioned for sensor calibration and student work. A Ludwieg tube is a cheap and efficient device used to produce supersonic/hypersonic freestreams for aerodynamic ground testing [1]. The layout of the Ludwieg tube is shown in Figure 1. In the reservoir, the test gas is compressed to a high pressure. At the exit of the reservoir is a fast-acting valve which opens for a short amount of time. At the opening, test gas will be expanded through the converging-diverging nozzle with a throat cross sectional area A*, and into the test section of cross sectional area A1. The Mach number of the freestream flow in the test section is governed by the area ratio A* / A1. Simultaneously, at the opening of the valve, an expansion wave travels upstream in the reservoir, after which it will reflect at the end wall and travel downstream towards the nozzle again. Upon reaching the nozzle, the valve is closed. The duration for the valve to be open is given by tshot, and is calculated using Equation 1, where L is the length of the reservoir and atube is the speed of sound in the reservoir.

Item URL in elib:https://elib.dlr.de/199257/
Document Type:Conference or Workshop Item (Speech)
Title:Comissioning of a Ludwieg Tube in DLR Göttingen
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Surujhlal, DivekUNSPECIFIEDhttps://orcid.org/0000-0002-0349-3328UNSPECIFIED
Date:8 November 2023
Journal or Publication Title:STAB Jahresbericht 2023 zum 21. STAB Workshop
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 164-165
EditorsEmailEditor's ORCID iDORCID Put Code
Series Name:Jahresbericht
Keywords:Ludwieg Tube, wind tunnel, hypersonics, comissioning
Event Title:21. STAB - Workshop 2023
Event Location:Göttingen, Germany
Event Type:Workshop
Event Start Date:7 November 2023
Event End Date:8 November 2023
Organizer:DLR, STAB
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 - Reusable Space Systems and Propulsion Technology
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Surujhlal, Dr. Divek
Deposited On:07 Dec 2023 10:57
Last Modified:24 Apr 2024 20:59

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