lh2 absorber program and plans
DESCRIPTION
LH2 Absorber Program and Plans. Mary Anne Cummings NIU. Mucool LH2 Absorber Collaboration. E. L. Black, M. Boghosian, K. Cassel D. M. Kaplan, W. Luebke, Y. Torun Illinois Institute of Technology S. Ishimoto, K. Yoshimura KEK M. A. Cummings, A. Dyshkant, D. Hedin, D. Kubik - PowerPoint PPT PresentationTRANSCRIPT
LH2 Absorber Program and Plans
Mary Anne Cummings
NIU
Mucool LH2 Absorber Collaboration E. L. Black, M. Boghosian, K. Cassel D. M. Kaplan, W. Luebke, Y.
TorunIllinois Institute of Technology
S. Ishimoto, K. YoshimuraKEK
M. A. Cummings, A. Dyshkant, D. Hedin, D. KubikNorthern Illinois University
D. Errede, M. HaneyUniversity of Illinois, Urbana-Champaign
M. Reep, D. SummersUniversity of Mississippi
Y. KunoOsaka University
G. Barr, W. LauOxford University
C. Darve, C. Johnstone*, A. Klebaner, B. Norris, M. Popovic, S. GeerFNAL
* also research faculty at IIT
Thin Window Design
Minimize window thickness:
ANSYS Finite Element Analysis, Zhizing Tang, FNAL.
Title:
Creator:
Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
Title:
Creator:
Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
beam axis beam axis
displacementdisplacement
R
r
r
Hemispherical: t = 0.5PL / (SE - 0.1P) s = 0.5D Ellipsoidal: t = 0.5PD / ( SE - 0.1P) s = .25DTorispherical: t = 0.885PD / ( SE - 0.1P) s = .169D
t = min. thickness s = sagitta
r
s
D
r
L
R
Minimum thickness depends on shape (ASME Standard)
Variable thickness near window edges can further reduce the minimum window thickness near beam:
Absorber Window Design
Modified Torispherical integrated window and flange design (tapered detail at left).Machine parameters shown.
Precision measurement of window and flange with CMM at FNAL Industrial Center.
R
r r
Window manufacture (U of Miss)
Backplane for window pressure tests
Flange/window unit machined from aluminum piece
Overpressure Window Test
Safety review requires overpressure and destructive tests of thin windows.
Tests to confirm Finite Element Analysis predictions for window performance.
Window Test Setup
Test setup at NIU for window over-pressure and rupture, front view
Backplane with connections,and with window attached
Strain gages applied to window
Pressure test setup at NIU
Strain Gage Measurement• Measure the strain on window with strain
gages• Use Finite Element Analysis program
(ANSYS) to relate vessel pressure to maximum window strain – confirm this with strain gages applied to window surface
Rosette gage(three dir.)
Uniaxial gage
FEA mesh for calcs. on the window-flange unit
Instrumented window
Two different gages
Testing of strain gages on aluminum 6061strips … verifying correct strain/stressRelationship, I.e. Young’s Modulus
Test setup to stress aluminum “coupons”with strain gages (below)
Strain Gage Calibration
Photogrammetry
• Non-contact measurement of strain by calculating displacement
• Compare with strain gage readout and FEA calculations
FEA calc. fordisplacement
Photogrammetry measurements during pressure test.Note the projected dots!
Rupture test
Leaking appeared at 31 psi (predicted rupture ~ 34 psi)… outright rupture at 44 psi!
130 window:
330 window:
Burst at ~ 120 psiNew FEA predicted rupture at 110 psi – old FEA predicted at ~ 90
Strain GageMeasurements
Rosette at 12mm showing yielding..
-500
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
-20.00 0.00 20.00 40.00 60.00 80.00 100.00 120.00
PSI
mic
rost
rain
Rosette at 12 mm Left gage
Rosette at 12 mm Middle gage
Rosette at 12 mm Right gage
Strain vs time - can see that rosette did not return to 0 ustrain after experiencing ~80psi
-500
0
500
1000
1500
2000
0 500 1000 1500 2000 2500
Time (s)
Mic
rost
rain
-2.00E+01
0.00E+00
2.00E+01
4.00E+01
6.00E+01
8.00E+01
1.00E+02
1.20E+02
PS
I
Uniaxial at 132mm
Rosette at 12 mm Left gage.
Pressure
Strain gage data 330m window
Strain vs. time – the gage ceases to return to resting position after ~ 80 psi
Rosette Gage at 12 mm yielding..
130 micron window
Photogrammetry
New “screens” for projectorWill provide better coverage ofCenter and radial geometry
•330 micron window (W. Lau)•Non-elastic region included•Three dimensional analysis
FEA Calculations
Stress distribution when first yield developed at 77.7psi (0.536 MPa) pressure
Forced-Flow Absorber Design
Mucool ~ 100W (E. Black, IIT) Large and variablebeam width =>large scale turbulence
Establish transverseturbulent flow withnozzles – complicated, hard to simulate
External Heat Exchange:
Flow Tests
Three test modes:
1. Absorber manifold , two plastic windows:Absorber filled with water at room temp. – the pattern of flow will be photographed by circulating water from inlet to outlet using a luminous die injected at inlet
2. Absorber manifold , one plastic windows, one aluminum windowAbsorber subjected to a heat source. Infrared pictures taken (for forced-flow and convection absorber type.
3. Absorber manifold , two thin Al windows, cryogenic:Absorber integrated into a cryo system, operating in test mode with extreme temperature and pressure variations considered for safety.
Room Temperature Flow Test Setup
“STUDY I” 13 cm 15cm 9.2 liters 91 W 1.2 atm 17oK
SFOFO 21 cm 11 cm 9.2 liters 147 W “ “
(1.65)
SFOFO 35 cm 18 cm 35.6 245 W “ “
(2.75)
DOUBLE 39 cm 20 49 273 W “ “
FLIP
MINICOOL 1.75 m 30 495 1.2 kW “ “
ICE 35 (?) 15 31 245 W “ “
Prototype LH2:length radius volume heat dep. Press. Temp.
Parameters for various absorber design