University of Bristol Pressure-Neutral Acoustic Wind Tunnel
University of BristolBristol
NWTF describes this Bristol facility as a closed-loop, open-jet wind tunnel for combined aerodynamic and aeroacoustic testing of propellers, rotors and distributed electric propulsion. Its pressure-neutralisation system reduces recirculation of tunnel-generated turbulence. Synchronous measurements link loading, wakes and noise to propeller rotation.
Reviewed by Arc · About this review
Key facts
- Pressure-neutral arrangement
- Openings above and below the nozzle and collector balance chamber pressure; lower openings connect to quiet extraction fans to reduce recirculation during propeller and proprotor testing.
Testing capabilities
Rotating-system performance and noise
The facility supports thrust, torque and multi-axis force measurements together with near-field and far-field noise, tonal and broadband characterisation, acoustic directivity and beamforming source localisation.
Phase-locked flow and wake measurements
The measurement systems can synchronise with propeller rotation for phase-locked aerodynamic loading, wake and noise studies. Listed methods include time-resolved and conventional two- and three-dimensional PIV and hot-wire or hot-film anemometry.
Equipment and published limits
| Specification | Published value | Conditions |
|---|---|---|
| Rectangular nozzle and flow | 1.0 × 0.7 m nozzle; approximately 5–35 m/s free-stream velocity | The listed nozzle and velocity figures are specific to this facility and agree with its linked data sheet. Model, propeller and inflow-condition suitability still require confirmation. |
| Acoustic chamber | Approximately 3.8 × 4.2 m in length and width; anechoic down to 160 Hz | The labelled source block states these chamber dimensions and acoustic threshold. They are not propeller diameter or universal measurement accuracy limits. |
Access and contact
The exact NWTF page says the facility is available to academic and industry researchers and provides a contact link. Agree propeller configuration, inflow, phase locking and the required acoustic and loading outputs.
Facility contact
- Address
- Bristol
- Website
- Official test house website
Standards and accreditation
Public information not available. Contact test facility provider for more information.
What to confirm with the facility
- Confirm the exact test method, specimen configuration, acceptance criteria, reporting, availability and quotation directly with the operator.
Before requesting a test
Public information not available. Contact test facility provider for more information.
Frequently asked questions
Public information not available. Contact test facility provider for more information.
Related testing facilities
Further reading
Sources and review
Arc reviewed the exact NWTF facility page on 13 October 2026. Published figures describe specific apparatus and source conditions. Confirm the required configuration, actual usable envelope, measurement plan and commercial arrangements with the operator.
Arc publishes this directory entry and does not operate the test facility. Suggest a correction to Arc with a supporting source.
Pressure-Neutral Acoustic Wind Tunnel - NWTF
The exact NWTF facility page supplies the named university facility, published method, configuration, measurement details and information route. Figures retain their stated apparatus and conditions; the page does not establish accreditation, current slots, commercial terms or item acceptance.
University of Bristol Pressure Neutral Acoustic Wind Tunnel PNWT data sheet (undated)
The observed linked NWTF data sheet is undated. Its separate nozzle, free-stream velocity and chamber figures agree with the cited page. The sheet’s operational-status label does not establish current commissioning status or booking availability.