Main Research Fields and Facilities
  Research Fields

1) Gas Flow rates Standard
   Constant Volume tank system of 13, 1, 0.05 m3 has been developed to calibrate 
sonic nozzles. The nozzles of flow rate between 400 to 1 m3/h were manufactured 
by super accurate machining technique and uncertainties of their discharge coefficient 
were between 0.05 to 0.1 %. 
Closed loop pressurized air circulating system was developed to calibrate gas meters 
using these nozzles at the flow range between 1 to 1000 m3/h at 0.1 - 1 MPa.

2) Development of Standard Vortex Shedding Flowmeter
   New vortex shedding flowmeter of dry calibration type has been developed. The K-Factor of the 
flowmeter can be determined by only the flowmeter dimensions without calibration using the actual 
fluid flow. Sensitivity of each flowmeter dimension to the K-Factor was examined to determine 
manufacturing allowance. The standard design of the flowmeter was also determined.

3) Low and Medium Air Velocity Standard
   Low air velocity standard has been developed using a towing carriage. Various anemometers 
to be tested are installed on the carriage and it runs at a constant speed between 
0.01 to 4 m/s on a 45 m long rail in underground tunnel. Very low speed wind tunnel 
for anemometer calibration has also developed. The wind tunnel is an open circuit suction type 
and can calibrate at a range between 0.05 to 1 m/s in 300 mm circular test section. 
Medium air velocity standard project has just initiated to calibrate Pitot Static tube 
and other anemometers up to 30 m/s using LDA as a reference speed. 

4) Small Mass Flow Standard
   Small mass flow standard based on gravimetric method has been developed. The facility can 
measure flow rates up to 5 g/min. with uncertainty better than 0.08 %. Small sonic nozzles 
are calibrated by the facility and are used as the transfer standards. The discharge coefficient 
of nozzles are determined with uncertainty better than 0.15 %. 
The facility is under reconstruction to improve measuring range and measuring uncertainty now. 

5) Development of Laser Flowmeter
   A new flowmeter is being developed using a laser diode for industrial applications. 
The principle of the optics is based on the longitudinal multi-mode oscillation 
in laser cavity which shows typical saw tooth spectrum. Performance of the new principle is 
examined in detail now. 



	 the constant volume tank system

  Facilities

1) Head Tank Large Water Flow Calibration Facility up to 3000 m3/h, Re = 106, 
   Maximum Pipe Diameter = 1100 mm, Weighing Tank : 50 t

2) Gas Flow Calibration Facility up to 1000 m3/h, 0.1 to 1 MPa, Re = 2 x 106,
   Constant Volume Tank : 13, 1, 0.05 m3

3) Towing Carriage in an Underground Tunnel for Air Velocity Measurement, 
   Velocity Range : 0.01 to 4 m/s,  Length : 45m

4) Wind Tunnel
   400 x 400 mm square test section, Velocity Range :3 to 30 m/s,  Turbulence Level: 0.05%, 
   Two Color Argon Laser LDV System

5) Mass Flow Calibration Facility for Small Gas Flow, 0.3 - 4 L/min.
   Balance for Weighing Tank : 30 kg - 1 mg(30L), 10kg - 0.01 mg(10L) 

6) Computer System for Numerical Simulation (Hardware: HITACHI SR8000) 


	 the overflow headtank
	

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