Design and Evaluation of a Laser Doppler Velocimeter for the AEDC-PWT 4-Foot Transonic Tunnel
Design and Evaluation of a Laser Doppler Velocimeter for the AEDC-PWT 4-Foot Transonic Tunnel

Author: F. L. Crosswy

Publisher:

Published: 1978

Total Pages: 62

ISBN-13:

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The design details and initial performance evaluation of a two-component Laser Doppler Velocimeter (LDV) system for a large transonic wind tunnel are presented. The two-color, backscatter LDV was specially developed for free-stream, pitch plane flow angle and velocity magnitude measurements using only intrinsic particulate matter as light scatterers. An environmental control system and remote optical alignment techniques were developed since the LDV was located in the hostile environment (vibration, vacuum, inaccessibility, etc.) of the tunnel plenum region. A new-type LDV signal processor was developed to process the low-level signals produced by the small intrinsic particles. A versatile, computer-based system was developed for high-speed data acquisition. LDV mean velocity and flow angle data are compared to free-stream velocity data and aerodynamic flow angle probe data. (Author).

Transonic Wing/store Flow-field Measurement Using a Laser Velocimeter
Transonic Wing/store Flow-field Measurement Using a Laser Velocimeter

Author: F. L. Heltsley

Publisher:

Published: 1981

Total Pages: 62

ISBN-13:

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A test was conducted in the Arnold Engineering Development Center (AEDC) Aerodynamic Wind Tunnel (1T) of the Propulsion Wind Tunnel Facility (PWT) to measure the flow fields about several wing/pylon/store configurations. Test models included a wall-mounted swept wing, five-percent MK-83 and M-117 stores, and swept and unswept pylons. Flow-field velocity measurements, made by using a three-component laser velocimeter, are presented. (Author).

Scientific and Technical Aerospace Reports
Scientific and Technical Aerospace Reports

Author:

Publisher:

Published: 1979

Total Pages: 722

ISBN-13:

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Laser Velocimetry and Particle Sizing
Laser Velocimetry and Particle Sizing

Author: Howard Doyle Thompson

Publisher:

Published: 1979

Total Pages: 586

ISBN-13:

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Contents: A Historical Review of Laser Velocimetry. Developments in Instrumentation, Data Analysis, Combustion Measurements, Measurements in Turbulent Flows, Measurements in Internal Combustion Engines, General Applications, Particle Diagnostics, Wild Card Session, and Panel Discussion.

The Design of a Laser Doppler Velocimeter for Transonic Flows
The Design of a Laser Doppler Velocimeter for Transonic Flows

Author: Michael K. Pedigo

Publisher:

Published: 1973

Total Pages: 100

ISBN-13:

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. ;DAAH01-72-C-0089DA-1-M-262303-A-214RD73-25*Laser velocimeters, *Flowmeters, Doppler systems, Transonic flowDesignDesign considerations for laser doppler velocimeters suitable for transonic flow measurements are presented. The optical and mechanical elements of an instrument designed for such application are described in detail. The device is of the differential doppler-backscatter configuration and uses an argon laser. Independent and simultaneous measurement of two orthogonal velocity components is accomplished by using both the 4880 and 5145 angstrom argon wavelengths. Results of preliminary velocity measurements in a two-dimensional transonic nozzle and an open jet are presented to illustrate the performance of the velocimeter. (Author).