Tobias Sander  , Marco Kirschner  , Adrian S. Pudsey , Christian Mundt

DOI Numer XXX-YYY-ZZZ

Conference Number HiSST 2018_38401106

Growing interest in the investigation of the Martian atmosphere requires ground-based test facilities, which are able to simulate the thermochemical flow conditions prevailing during entry. At the Institute of Thermodynamics at the Bundeswehr University Munich an arc-heated plasma wind tunnel can provide steady-state, high-enthalpy flows. Being equipped with a high efficiency vacuum pump and being operable with CO2 as the test gas, realistic entry conditions into Martian atmosphere can be provided. For the thermometry of the high-temperature flow, non-intrusive, optical test methods are well suited. In the present work, the high-temperature flow with an enthalpy of 3.1 MJ/kg and 3.8 MJ/kg is investigated with a two-photon excitation process of CO molecules. For the excitation of the Q-branch of the 𝐵 1Σ + ← 𝑋 1Σ +(0,0) transition, the laser is tuned from 230.05 nm to 230.11 nm. Simulated spectra were calculated in advance with a simulation tool called NOCO-Spectra. The rotational temperature of CO in a high-temperature flow is evaluated by a correlation automated rotational fitting method (CARF).

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In Categories: HiSST 2018, Hypersonic Aerodynamics, Spacecraft Design & Manufacturing, Supersonic and Hypersonic Aircraft Design, Thermal and Energy Management Systems
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