Closure to “Discussion of ‘A Three Dimensional Density Field Measurement of Transonic Flow From a Square Nozzle Using Holographic Interferometry’” (1977, ASME J. Fluids Eng., 99, pp. 743–744)

1977 ◽  
Vol 99 (4) ◽  
pp. 744-744
Author(s):  
L. T. Clark ◽  
D. C. Koepp ◽  
J. J. Thykkuttathil
Keyword(s):  
Holographic Interferometry ◽  
Field Measurement ◽  
Transonic Flow ◽  
Three Dimensional ◽  
Density Field

A Three Dimensional Density Field Measurement of Transonic Flow From a Square Nozzle Using Holographic Interferometry

1977 ◽  
Vol 99 (4) ◽  
pp. 737-743 ◽  
Author(s):  
L. T. Clark ◽  
D. C. Koepp ◽  
J. J. Thykkuttathil
Keyword(s):  
Holographic Interferometry ◽  
Transonic Flow ◽  
Ambient Pressure ◽  
Pressure Ratio ◽  
Three Dimensional ◽  
Density Field ◽  
Technical Improvement ◽  
Potential Core ◽  
Core Part ◽  
Accurate Experimental Data

The three dimensional static density field was measured for transonic flow from a square nozzle using holographic interferometry. These measurements are presented in order to show the efficiency of this method for obtaining accurate experimental data of transonic flows. The accuracy of the measurement was estimated by operating the nozzle at a pressure ratio of 1.89 where the flow should expand to the ambient pressure with no afterexpansion effects. The standard deviation in the static density was approximately 1 percent over the isentropic (potential core) part of the flow. Data are also presented for a pressure ratio of 2.14 where afterexpansion effects are important. The method described represents a significant technical improvement in practical interferometry.

Quantitative Determination of Three-Dimensional Density Field by Holographic Interferometry

AIAA Journal ◽  
1975 ◽  
Vol 13 (7) ◽  
pp. 841-842 ◽  
Author(s):  
Tse-Fou Zien ◽  
William C. Ragsdale ◽  
W. Charles Spring
Keyword(s):  
Quantitative Determination ◽  
Holographic Interferometry ◽  
Three Dimensional ◽  
Density Field

Finite Fringe Holographic Interferometry Applied to a Right Circular Cone at Angle of Attack

1972 ◽  
Vol 39 (4) ◽  
pp. 897-903 ◽  
Author(s):  
R. C. Jagota ◽  
D. J. Collins
Keyword(s):  
Holographic Interferometry ◽  
Present Report ◽  
Angle Of Attack ◽  
Three Dimensional ◽  
Density Field ◽  
Circular Cone ◽  
Governing Equations ◽  
Wind Tunnel Experiments ◽  
Three Dimensional Flow ◽  
Half Angle

The successful application of holography to the study of three-dimensional flow fields due to phase objects has been reported in the literature. The present report extends this technique to the study of density fields around opaque bodies as would normally be encountered in wind tunnel experiments. The density field around a 10-deg half-angle cone at 0 and 10-deg angle of attack has been investigated by means of the finite fringe holographic interferometry. The three-dimensional density field obtained from the reduction of the interferograms was found to agree with that obtained from an analytical solution of the governing equations.

scholarly journals A Field Measurement Based Wind Characteristics Analysis of a Typhoon in Near-Ground Boundary Layer

Atmosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 873
Author(s):  
Dandan Xia ◽  
Liming Dai ◽  
Li Lin ◽  
Huaifeng Wang ◽  
Haitao Hu
Keyword(s):  
Turbulence Intensity ◽  
Field Measurement ◽  
Three Dimensional ◽  
Wind Data ◽  
Statistical Characteristics ◽  
Gust Factor ◽  
Characteristics Analysis ◽  
Wind Characteristics ◽  
The Mean ◽  
The Relationship

The field measurement was conducted to observe the wind field data of West Pacific typhoon “Maria” in this research. With the application of ultrasonic anemometers installed in different heights (10 m, 80 m, 100 m) of the tower, the three dimensional wind speed data of typhoon “Maria” was acquired. In addition, vane-type anemometers were installed to validate the accuracy of the wind data from ultrasonic anemometers. Wind characteristics such as the mean wind profile, turbulence intensity, integral length scale, and wind spectrum are studied in detail using the collected wind data. The relationship between the gust factor and turbulence intensity was also studied and compared with the existing literature to demonstrate the characteristics of Maria. The statistical characteristics of the turbulence intensity and gust factor are presented. The corresponding conclusion remarks are expected to provide a useful reference for designing wind-resistant buildings and structures.

scholarly journals Aerodynamic Design for Three- Dimensional Multi- lifting Surfaces at Transonic Flow

2006 ◽  
Vol 19 (1) ◽  
pp. 24-30 ◽  
Author(s):  
Qing-zhen YANG ◽  
Zhong-yin ZHANG ◽  
Streit Thomas ◽  
Wichmann Georg ◽  
Yong ZHENG
Keyword(s):  
Transonic Flow ◽  
Three Dimensional ◽  
Aerodynamic Design ◽  
Lifting Surfaces
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