Ultrasonic Anemometer Data - Northbound
This page contains data measured using ultrasonic anemometers during the
following Northbound train runs:
| Train Run Number |
Speed (km/h) |
Data File |
| 35337 |
177.5 |
35337-s04.dat |
| 35339 |
198.5 |
35339-s06.dat |
| 35343 |
204.0 |
35343-s08.dat |
| 35353 |
196.0 |
35353-s13.dat |
| 35361 |
198.5 |
35361-s15.dat |
| 35365 |
147.5 |
35365-s17.dat
35365-s18.dat
(Data continues into second file) |
The data files can be viewed in a text editor and can be downloaded from
http://www.thermotun.com/airshaft/ultrasonic/ultrasonic-northbound-dat.zip
Example Graphs
The following example graphs have been produced from data file 35337-s04.dat
| The measurement enclosure on top of the airshaft was
divided into 8 compartments (see photographs
of the airshaft). The layout of the graphs represents the distribution
of 6 ultrasonic anemometers in the airshaft as viewed from above.
Each ultrasonic sensor measured flow data in 3 directions. Each direction
is shown in a different set of graphs below. The speed of sound was
estimated by the ultrasonic sensors and is included in a further set
of graphs. |
Diagram of airshaft from above showing orientation of ultrasonic sensors. |
u direction: vertical airflow component (+ve = up the shaft)
v direction: lateral airflow component (+ve = right to left in the top boxes,
left to tight in the bottom boxes)
w direction: longitudinal airflow component (+ve = inwards from shaft wall)
c: speed of sound (approx)
u direction: Comparison between two sets of three ultrasonic sensors.
