Mach-Number Measurement with Laser and Pressure Probes in Humid Supersonic Flow | Zendy

G. C. Herring | Zendy

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Mach-Number Measurement with Laser and Pressure Probes in Humid Supersonic Flow

Author(s) -

G. C. Herring

Publication year - 2008

Publication title -

aiaa journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.828

H-Index - 158

eISSN - 1081-0102

pISSN - 0001-1452

DOI - 10.2514/1.36107

Subject(s) - mach number , supersonic speed , choked flow , mechanics , drag divergence mach number , airflow , dew point , static pressure , flow (mathematics) , stagnation pressure , pressure sensitive paint , materials science , acoustics , pressure measurement , laser , optics , physics , meteorology , transonic , thermodynamics , aerodynamics , wind tunnel

Mach-number measurements using a nonintrusive optical technique, laser-induced thermal acoustics (LITA), are compared to pressure probes in humid supersonic airflow. The two techniques agree well in dry flow (-35 C dew point), but LITA measurements show about five times larger fractional change in Mach number than that of the pressure-probe when water is purposefully introduced into the flow. Possible reasons for this discrepancy are discussed.

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