QLT5 was installed in May 2019 and recently completed shakedown and calibration. Tunnel performance and calibration data are published in Bearden et al., 2022.
It currently operates as a conventional tunnel and a quiet nozzle upgrade is currently in the fabrication stage and is expected to be delivered in mid-2023. Tunnel run parameters and instrumentation are given in the tables below.
Tunnel operating parameters
|Quasi-steady run time||ms||100|
|Test-section diameter||mm (in.)||381.0 (15.0)|
|Unit Reynolds number, Re'||106 m-1 (106 ft-1)||5.2–39.9 (1.6–12.2)|
|Total pressure, p01||kPa (psia)||344.7–2068.4 (50–300)|
|Total temperature, T01||K (°F)||385–450 (233–350)|
|NI PXIe-6378 analog-to-digital converters||32||16-bit, 3.57 MS/s/ch.|
|NI PXIe-6361 analog-to-digital converter||16||16-bit, 2 MS/s|
|NI PXIe-4353 thermocouple blocks||64||24-bit, 90 S/s|
|Precision Filters 28144 resonant sensor excitation||32||≥1 MHz bandwidth|
|Precision Filters 28612 programmable LP filter/amplifiers||32||fc ≤ 3 MHz|
|Kulite KSC-2 signal conditioner||4||Resonance compensation|
|FLIR X8501sc MWIR thermography||2||14-bit, 1280×1024 px, 3.0 µm– 5.0 µm|
|Focusing schlieren (Photron FastCam SA-Z, Spectabit Optics)||1||up to 1024×1024 px, up to 2.1M fps (reduced res)|