Temperature Measurement of HEK-X Expansion Tube Flow by Laser Absorption Spectroscopy

• MATSUI Makoto

  Department of Engineering, Shizuoka University

• KOBAYASHI Ryuji

  Department of Engineering, Shizuoka University

• OKAMOTO Takashi

  Department of Engineering, Shizuoka University

• YAMADA Kazuhiko

  Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency

• TANNO Hideyuki

  Kakuda Space Center, Japan Aerospace Exploration Agency

Abstract

An expansion tube is a promising facility to simulate atmospheric entry conditions, although its flow conditions have not been completely characterized mainly owing to its short operation time. In this study, laser absorption spectroscopy was applied to diagnose HEK-X expansion tube flow in the Kakuda Space Center. The target is an absorption line of an oxygen molecule at 763 nm. To increase the sensitivity, optical path length was extended by five times using mirrors. Consequently, an absorption profile with a fractional absorption of 2.4 ± 0.3% was detected at a shock velocity of 7.65 ± 0.05 km/s. The estimated translational temperature from the Voigt fitting was 2750 ± 450 K.

Journal

• TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

  TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 64 (3), 193-194, 2021

  THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

Keywords

• Expansion Tube
• Laser Absorption Spectroscopy
• Translational Temperature

Details

• CRID: 1390006432294376832
• NII Article ID: 130008034561
• DOI: 10.2322/tjsass.64.193
• ISSN: 21894205
• ISSN: 05493811
• Web Site: https://www.jstage.jst.go.jp/article/tjsass/64/3/64_T-20-38/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed