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Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
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Laser-induced schliere anemometry in a Mach 6 flow with collinear light entry
Applied Optics
|April 26, 2022
Summary
Laser-induced schliere anemometry (LISA) successfully measured hypersonic flow properties. This technique accurately determined velocity, Mach number, and temperature in a Mach 6 flow, validating its use in advanced aerodynamic research.
Area of Science:
- Fluid Dynamics
- Aerodynamics
- Optical Measurement Techniques
Background:
- Hypersonic flow characterization is crucial for aerospace applications.
- Traditional measurement techniques can be intrusive or limited in hypersonic regimes.
- Laser-induced schliere anemometry (LISA) is a novel optical method for flow diagnostics.
Purpose of the Study:
- To demonstrate the application of LISA for hypersonic flow measurements.
- To validate LISA's accuracy by comparing results with known facility data.
- To explore a new LISA optical arrangement for improved accessibility.
Main Methods:
- Utilized laser-induced schliere anemometry (LISA) to measure flow parameters.
- Introduced laser beam parallel to collimated schlieren light for schliere generation.
- Performed measurements in a Mach 6 flow environment.
Main Results:
- Achieved velocity measurements within 1% of isentropic theory.
- Mach number measurements were within 1.6% of established facility values (M=5.85).
- Static temperature measurements were within 2.5% of simultaneous facility measurements.
Conclusions:
- LISA is effective for characterizing hypersonic flows.
- The novel optical arrangement offers advantages for facilities with limited optical access.
- LISA provides accurate and reliable aerodynamic measurements in the hypersonic regime.
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