HPR: water jet force measurement

HPR: water jet force measurement
Experimental set up: in the HPR system a load cell is installed.
Distance between the cell and the nozzle is the same as the
one for the equator of TTF cavity.
Water jet parameters during the test:
Orifice diameter: 0.55 mm
Throughput: from 0 to 1.7 l/min
Pump pressure: up to 120 bar
Nozzle
Nozzle
sapphire
orifice
Water
jet
Paolo Michelato INFN Milano – LASA
Hamburg March 31, 2005
Load
cell
Force sensor: miniaturized load cell
Sensor: Honeywell FSG-15N1A
Sensor: Silicon piezoresistor
Sensitivity (@10 V): 24 mV/N
Max load: 15 N
Overforce max: 55 N
Linearity: 0.5 % read.
Reproducibility: 0.2 % read.
Sensor deflection: < 30 µm
RS catalog: 235-6210
Paolo Michelato INFN Milano – LASA
Hamburg March 31, 2005
Reading system and calibration
60
Cell output (mV)
50
40
30
20
10
0
0
0.5
y = 24.64x - 0.06
R2 = 1.00
1
1.5
Force (N)
Reading System: Solartron digital multimeter, 6 ½ digits
Paolo Michelato INFN Milano – LASA
Hamburg March 31, 2005
2
2.5
Very preliminary data
5
Distance nozzle - sensor:
TTF Equator
4.5
4
Force (N)
3.5
3
2.5
2
1.5
Measured data
1
Calculated data
0.5
0
0
20
40
60
80
100
120
Water pressure (bar)
Data are calculated as the water will loose all the energy in the impact and no
energy was loss during the flight from the nozzle
F = 2 ⋅ A N ⋅ (Ppump − PAtm )
Paolo Michelato INFN Milano – LASA
Hamburg March 31, 2005
The force sensor in the HPR
Paolo Michelato INFN Milano – LASA
Hamburg March 31, 2005
What can be done in the future?
Do more reliable measurements, avoiding HPR head
vibrations.
Measure of the force during system rotation: jet
profiling is possible? (signal deconvolution ?)
System can be easily transferred to other labs to
make comparison of the water jet characteristics.
Paolo Michelato INFN Milano – LASA
Hamburg March 31, 2005
Pictures in the light and in the dark
2 – 3 mm
Luminescence +
OZONE
?
Paolo Michelato INFN Milano – LASA
Hamburg March 31, 2005