Details

Autor(en) / Beteiligte

• Canosa, A.
• Ocaña, A. J.
• Antiñolo, M.
• Ballesteros, B.
• Jiménez, E.
• Albaladejo, J.

Titel

Design and testing of temperature tunable de Laval nozzles for applications in gas-phase reaction kinetics

Ist Teil von

• Experiments in fluids, 2016-09, Vol.57 (9), p.1-14, Article 152

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A series of three de Laval nozzles initially designed to generate uniform supersonic flows in helium at 23 and 36 K and in argon at 50 K have been used with either pure nitrogen or mixtures of nitrogen with helium or argon in order to make a sequence of pulsed supersonic flows working at different temperatures. For this, a computer homemade program has been used to design de Laval nozzles contours for gas mixtures in order to determine the theoretical pressure P and temperature T in these supersonic flows. Spatial evolution of T along the flow axis downstream of the nozzle exit has been characterized with a fast response Pitot tube instrument newly developed. Twenty-eight different gas mixture conditions have been tested, indicating a very good agreement with the corresponding calculated flow conditions. The length of uniformity Δ L of the supersonic flows have been found to be >30 cm in more than 80 % of the situations and >50 cm for more than 50 % of the tested conditions. Fine temperature tunability was achieved in the range 22–107 K with very small fluctuations of the mean temperature along Δ L . Advantages and limits of these new developments for studies of gas-phase reaction kinetics are discussed.