Large Wind Tunnel Test Section

Illustrative flow physics · textbook equations

Wind Tunnel Test Section

Density kg/m³1.20

Dynamic pressure Pa617

Reynolds number2.55M

Mach number0.09

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Drag to orbit · select a part · explore internal airflow and the complete dependency-based assembly.

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Structural inspection

Cutaway exposure 0%

Exploded distance 0%

Accent lighting 70%

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Animate airflow and axial fan (illustrative)

Physics controls · illustrative

Air speed 32 m/s

Air temperature 293.15 K

Static pressure 101325 Pa

Characteristic length 1.2 m

Independent textbook check: calculating…

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Guided assembly

Every one of the named components is available in dependency order. Begin to rebuild the machine.

Subassembly visibility

The science · equations and limitations

Principal mechanism: a driven fan moves air through a flow straightener, contraction, instrumented test section and diffuser. The displayed test article transfers aerodynamic force to an illustrative balance.

Textbook ideal-gas density: ρ = p / (R T), with R = 287.05 J/(kg·K) for dry air.

Textbook dynamic pressure: q = ½ρv². Textbook Reynolds number: Re = ρvL/μ, with fixed μ = 1.81×10⁻⁵ Pa·s for this illustrative range.

Textbook speed of sound: a = √(γRT) and M = v/a, with γ = 1.4. The independent check directly substitutes p/(RT) into the equation for dynamic pressure; it is not a second CFD solver.

Genuine scientific features: contraction, flow conditioner, pressure probes, traverse rake, force-balance support, viewing windows, diffuser and fan, as commonly used concepts in wind-tunnel facilities.

Engineering-inspired reconstruction: structural layout, instrumentation rack arrangement, survey targets, mechanical details and model scale. Simplified educational representation: incompressible-style pressure readouts using bulk properties; no spatial CFD or turbulence field is solved. Speculative components: fictional styling of optical modules and actuator geometry.

Every displayed operating value is illustrative; model dimensions and section spacings are scaled for explanation. Flow lines, probe light and fan motion are illustrative animation, not a validated scientific simulation.

Illustrative design, not affiliated with any real institution or manufacturer.

Learning lab

Engineering insight: measuring controlled airflow

The facility separates three engineering jobs: condition air upstream, make a stable and instrumented test region, and manage the flow downstream. The cutaway exposes the honeycomb, the test article, the internal balance and the rotor. Switch to Exploded for the subsystem layout, or use Guided assembly to examine dependencies one component at a time.

All values are explicitly illustrative and based on stated textbook equations, not site-specific performance. For the full technical essay, see the accompanying article.md in the same delivery folder. Illustrative design, not affiliated with any real institution or manufacturer.