Abstract
Tunable diode laser absorption spectroscopy on the oxygen molecule was used to measurement of the flow characteristics in the high enthalpy shock tunnel HIEST. Near Infrared (763nm) distributed feedback lasers were selected for this study. The free stream temperature of the test flow was measured under a stagnation pressure of P0=35MPa and under stagnation enthalpies of H0=3MJ/kg to H0=5MJ/kg. Laser beams crossed the test flow with angle of 8 degree to avoid etalonning effect of the test window and to measure Doppler shift. For high-sensitivity and quick response, wavelength modulation spectroscopy with second harmonic detection (2f-detection) was tried at a scanning frequency of 20kHz. Initial measurement result was compared with a one-dimensional non-equilibrium nozzle calculation code.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
