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Related Concept Videos

Design Example: Calculating Safe Diameter for Wind-Exposed Disc01:17

Design Example: Calculating Safe Diameter for Wind-Exposed Disc

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Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
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Related Experiment Video

Updated: Jul 29, 2025

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Density field measurement deflectometry for supersonic wind tunnels.

Xinwei Zhang, Dahai Li, Zekun Zhang

    Optics Letters
    |May 24, 2023
    PubMed
    Summary

    A novel deflectometry method accurately measures 2D density fields in shock-wave flows. This technique offers fast, simple, and cost-effective quantitative density measurements for aerodynamic research.

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    Area of Science:

    • Fluid Dynamics
    • Optical Measurement Techniques

    Background:

    • Quantitative measurement of density fields in shock-wave flows is crucial for aerodynamic research.
    • Existing methods may be complex or costly.

    Purpose of the Study:

    • To propose and validate a new method for quantitative measurement of two-dimensional density field distributions using deflectometry.
    • To provide a new, accessible approach for shock-wave flow field analysis.

    Main Methods:

    • The proposed method utilizes deflectometry, analogous to an inverse Hartmann test.
    • Light rays are passed through the shock-wave flow, and their deflection angles are calculated using phase information.
    • Density field distributions are then determined from the deflection angles.

    Main Results:

    • The density fields in wedge-shaped models were successfully measured in supersonic wind tunnels.
    • Experimental results showed good agreement with theoretical values, with a measurement error of approximately 2.76 × 10-3 kg/m3.

    Conclusions:

    • The developed density field measurement deflectometry (DFMD) method is effective for quantitative 2D density field measurements.
    • The method is characterized by fast measurement, a simple device, and low cost.
    • This offers a new avenue for studying shock-wave flow fields.