challenges in cryogenic development present & the future
TRANSCRIPT
CHALLENGES IN CRYOGENIC DEVELOPMENT
PRESENT & THE FUTURE
Presentation by
NK GUPTAProject Director, C25
LPSC-ISRO, Trivandrum
Twentieth National ConferenceNew Delhi
April 10-11, 2006
PERFORMANCE COMPARISON OF VARIOUS CYCLES (Comb. Chamber Pc=60Ksc, MR=6.4, AR=200)
217215-#Incr. P/L from GG Cycle (Kg)
33.4633.3534.87Thrust/weight Ratio
604606587Engine Weight (Kg)
20.21220.21220.468Engine Thrust (T)
5.8725.8725.441Engine Mixture Ratio
459.45459.45453.39Engine lsp. (s)
15512999LH2 Pump Outlet Pr. (Ksc)
Expander Cycle
Staged Combustion
Cycle
Gas Generator Cycle
Fig 1. ENGINE / SUBSYSTEMS
GAS GENERATOR
LOX TURBOPUMP
LH2 TURBOPUMP
INTEGRATED TURBOPUMP
THRUST CHAMBER
FLUID COMPONENTS
INTEGRATED ENGINE (SL)
Fig 5. GG HOT TEST SEQUENCE
OPEN Tf+0.2
OPEN Tf+2.5
OPEN Tf+1.5
HELIUM PURGE VALVE
LH2 VENT VALVE (HVV1)
LOX VENT VALVE (OVV1)
LOX VENT VALVE (OVV2)
LH2 INJECTION VALVE(HIV1)
LH2 INJECTION VALVE(HIV2)
IGNITER
LOX INJECTION VALVE(OIV1) LOX INJECTION VALVE(OIV2)
ToOPEN To-20
Tf =To + 50 s
OPEN To
CLOSE To+ 1.5 CLOSE Tf+10
CLOSE To-3
ON To+0.2 To+ 2.7
OPEN To+0.3 CLOSE Tf
CLOSE To-3.3
CLOSE To-6.5
CLOSE To-10
CLOSE Tf + 2.5
OPEN To+ 1.5 CLOSE Tf + 1
OPEN To+ 2.7 CLOSE Tf - 4
CLOSE To-5
DETAILS OF DOUBLE LAYERED RING
Major specifications :Property External layer Internal layer
• Composition Cu-10%Sn Cu-10%Sn-5%BN• Porosity(%) 30 Max. 20-35• Hardness(BHN) 50 Min. 35 Max• Bending strength 250 min(MPa) 100 min (MPa) • UTS 150 min. (MPa) 50 min (MPa)
Present status of Technology :The technology of processing double layered seal rings of all 3 sizes has been established through powder metallurgy route for application in C-25
Bronze Bronze SealringSealring(YMB(YMB--22)22) OD 53 x ID 44 x 11.3
mm
OD 110 x ID 100 x 12
mm
OD 126 x ID 118 x 9.5
mm
CC--25 Turbo Pump25 Turbo Pump
CE20 TP DEVELOPMENT TESTS
A. Cold Flow Tests with water/GN2
1. Pump tests, driven by Electric Motor.
2. Turbine test driven by GN2 absorbed by Dynamometer.
3. Integrated Turbo-pump test with GN2 & water.
B. Tests with Cryo Fluids LN2,LOX,LH2
4. Turbine driven by GN2 & Pump working with LN2.
5. Turbine driven by GG & Pump working with LN2.
6. Turbine driven by GG & Pump working with LH2/ LOX
C. Integrated Turbo-pump Tests
7. GG-LH2TP-LOXTP integrated tests.
LH2 PUMP COLD FLOW TEST
Proto LH2 pump at test bed for testing with water & driven by electric motor
LH2 TURBINE COLD FLOW TEST
Pi = 8.1 bar, Pout =1 bar,Ti = 284K, Flow =1.1 kg/sPR = 8.1 , U/Co = 0.15
LH2 Turbine tested with GN2 at design pressure ratio and low power level. Cd & efficiency as expected. Speed= 8300 rpm
Power= 80 KWCd value = 0.91-0.93Efficiency= 47% at U/Co=0.15
SPECIFICATIONS OF ENGINE & STAGE
Propellant Combination : LOX/LH2
Total propellant loading : 25790 kg
Operating Cycle : Gas Generator
Thrust, Nominal (Vacuum), kN : 200.7 (±3.0%)
Engine Specific Impulse, s : 443 ± 3
Engine Burn Duration (Nom), s : 550
Chamber Pressure, (Nom), MPa : 6.0
Engine Mixture Ratio : 5.05 (±1.5%)
LOX Flow Rate, kg/s : 38.546
LH2 Flow Rate, kg/s : 7.638
TP speed : 38000 rpm(LH2)
15000 rpm(LOX)
Anti static coatingHeat shield coatingVapour barrier coating
PUF
Adhesive
Tank wall
Fig. 11 CRYO TANK THERMAL INSULATION
CE20 ENGINE SUBSYSTEM TESTS
SINGLE ELEMENT HOT TESTS
GAS GENERATOR DEVELOPMENT TESTS
TURBO-PUMP BEARING TESTS WITH LN2; LOX/LH2
LOX TP SEAL TESTS WITH LN2 & LOX
LH2 TP SEAL TESTS WITH LN2 & LH2
LOX TURBO-PUMP TESTS GN2 & LN2/LOX; GG & LN2 /LOX
LH2 TURBO-PUMP CRYO TESTS GN2/GG & LN2/LH2
INTEGRATED TURBO-PUMP TEST (Pr Fed / Boot Strap)
SUB SCALE CHAMBER (19 ELEMENT) TEST
INTEGRATED SEA-LEVEL ENGINE TEST