Domestic Research and Development Trends of TDLAS Measurement Technology for High-Speed Flow Diagnosis

초록

With the advancement of air-breathing flight vehicles such as scramjet propulsion systems, the importance of flow diagnostic technologies capable of accurately measuring flow properties in high- temperature and high-speed flow fields has been increasing. In particular, precise diagnostics in the engine isolator and combustor regions are essential, as these areas directly influence overall propulsion performance and system stability. Against this backdrop, tunable diode laser absorption spectroscopy (TDLAS), which offers non-intrusive and high-speed response characteristics, has emerged as an effective alternative. TDLAS provides quantitative measurements of various physical parameters such as temperature, pressure, velocity, and species concentration without disturbing the flow. While numerous studies applying TDLAS to hypersonic flow fields have been actively conducted internationally, domestic efforts remain extremely limited-not only in terms of application to hypersonic flows but also in the development and deployment of TDLAS sensors under actual high-speed flight conditions. This paper presents a comprehensive overview of hypersonic flow diagnostics based on TDLAS technology conducted in domestic research, including thermal and mechanical environmental testing for sensor robustness, structural and signal system design, and experimental validation in supersonic flow fields.

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