Definition of Ablation testcase

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1 Dfinition of Ablation tstcas sris #3 5 t Ablation Worksop Lxington, KY Tom van Ekln LMS-Samtc, Blgium Jan Lacaud UARC/Univ. of California Santa Cruz, USA Alxandr Martin Univrsity of Kntucky, USA Ioana Cozmuta FNMS, USA 1-5 t Ablation worksop - 1

2 Outlin Dfinition of t mandatory Tst-cas Basic cas (Tst 3.1) Gomtry dfinition Matrial coic Hat load and boundary conditions Initial rsults for t basic cas Modification of t basic cas: Ortotropic TACOT matrial (Tst 3.) Full 3D tst-cas (Tst 3.3) Discussion of t tst-cass Discussion of a possibl r-ntry prob tst-cas - 5 t Ablation worksop - 1

3 Mandatory tst-cas Goal: to xtnd sris # to 3D Tst 3.1 Iso-q spcimn Gomtry wll dfind Milos F. and Cn Y.-K., Two-Dimnsional Ablation, Trmal Rspons, and Sizing Program for Pyrolyzing Ablators. Hat load distribution availabl Matrial (iso-q + support): TACOT v. 3-5 t Ablation worksop - 1

4 4-5 t Ablation worksop - 1 Load & boundary conditions (Similar to Tst.3) Initial uniform tmpratur Initial uniform prssur Adiabatic/imprmabl bottom surfac Radiation wit t nvironmnt Entalpy flux (stagnation point) Isotropic conductivity (axis-symmtric/3d) Mandatory tst-cas ( ) 4 4 T w T q = σε ( ) ( ) ( ) [ ] w g g w c c H w H B B C u C u q + + = ' ' ρ ρ 1 ' ' = B H H B C C λ λ =.5 λ

Y Z X Mandatory tst-cas C H (s) distribution qw ρ uch ( s) = ρuch ( ) qw( ) Constant and uniform prssur bcaus of: Possibl prssur galization Cooldown du to (non-carring)

5 Y Z X Mandatory tst-cas C H (s) distribution qw ρ uch ( s) = ρuch ( ) qw( ) Constant and uniform prssur bcaus of: Possibl prssur galization Cooldown du to (non-carring) gas flow Dc J.A., Laub B. and Braun R.D., Two- Dimnsional Finit Elmnt Ablativ Trmal Rspons Analysis of an Arcjt Stagnation Tst 5-5 t Ablation worksop - 1 Tst cas TACOT

6 Mandatory tst-cas Prssur distribution Hat flux at start of t calculation q =... + ρ u H Exampl: Tst.3 C B ' g ( ) g w Milos F. and Cn Y.-K., Two- Dimnsional Ablation, Trmal Rspons, and Sizing Program for Pyrolyzing Ablators. Fixd back-surfac prssur P Front surfac prssur.*p Tmpratur volution at outr wall Outr w all Wall ntalpy Gas ntalpy Tmpratur [K] Tim [s] Entalpy [J/kg] 4.E+7 3.5E+7 3.E+7.5E+7.E+7 1.5E+7 1.E+7 5.E+6.E+ -5.E E+7 Cooldown du to quilibrium ypotsis for t ntalpy Tmpratur [K] 6-5 t Ablation worksop - 1

5 Fig. 6 Cross-sctional drawing of iso-q-sapd arcjt modl wit Milos locations F. and Cn Y.-K., Two-Dimnsional trmocoupl for TC-placmnt options B andablation, D (s Tabl 1).

7 Fig. 4 Cross sction of iso-q arcjt modls. Modl typs II and III may contain a tr varid from 3.49 to 4.13 cm. Mandatory tst-cas Rsults Tst 3.1 TACOT Trmo-coupls: Tmpratur Dnsity Carring at stagnation point Global mass-loss Fig. 5 Axial plug containing trmocoupls 1 to Fig. 6 Cross-sctional drawing of iso-q-sapd arcjt modl wit Milos locations F. and Cn Y.-K., Two-Dimnsional trmocoupl for TC-placmnt options B andablation, D (s Tabl 1). Trmocoupls not coplanar. Trmalar Rspons, and Sizing Program for Pyrolyzing Ablators t Ablation worksop - 1 D inclu will b imags install Arcj (AHF) ARC a For all usd to cold-w multip At t ﬂowﬁ priod xpos T combin t sam calorim Bcaus variatio

8 Mandatory tst-cas Tmpratur [K] Wall Trmo-coupl 1 Trmo-coupl Trmo-coupl 3 Trmo-coupl 4 Trmo-coupl 5 Trmo-coupl 6 Tmpratur [K] 15 1 Trmo-coupl 5 Trmo-coupl 6 Trmo-coupl 7 Trmo-coupl 8 Trmo-coupl 9 Trmo-coupl Tim [s] Tim [s] Dnsity [kg/m^3] Wall Trmo-coupl 1 Trmo-coupl Trmo-coupl 3 Trmo-coupl 4 Trmo-coupl 5 Trmo-coupl 6 Dnsity [kg/m^3] Trmo-coupl 6 Trmo-coupl 7 Trmo-coupl 8 Trmo-coupl 9 Trmo-coupl Tim [s] Tim [s] 8-5 t Ablation worksop - 1

Rcssion Mass loss C.o.g. position Mass flow rat [kg/(m^.s)].16.14.

9 Mandatory tst-cas.18 Carring rsults at stagnation point Gas mass flow Car mass flow Virgin 98% distanc Car % distanc Rcssion Mass loss C.o.g. position Mass flow rat [kg/(m^.s)] m_dot_g m_dot_c Virgin 98% Car % rcssion Tim [s] Distanc [m].3.6 Mass C.o.g. position Mass [kg] Y-coordinat [m] Tim [s] 9-5 t Ablation worksop - 1

10 Mandatory tst-cas Modification of t basic cas 3.: Ortotropic conductivity (axis-symmtric/3d) Dfin t valus α 1 and α λ TTT α = 1 λ IP α λ isotropic TTT-dirction along t axis of axis-symmtry 3.3 Ortotropic conductivity wit 3D at flux (3D) 3D at flux to tst 3D bavior f ( x, y) = 1+ β 1 σ [( µ x) + ( µ y) ] x Rplacd by à Ortotropic matrial wit TTT non-alignd wit axis of axis-symmtry y Otr idas ar wlcom 1-5 t Ablation worksop - 1

R-ntry prob cas Small ntry prob (SPRITE) tst-cas proposal Qustions tat nd to b answrd: Will w apply a ralistic

How will t gomtry of t tst-cas b dfind: will a D (cross sction) dscription b givn?

Do w nd to modl radiation at xcang (btwn structur and instrumnts) insid t capsul?

11 R-ntry prob cas Small ntry prob (SPRITE) tst-cas proposal Qustions tat nd to b answrd: Will w apply a ralistic r-ntry load, and if so wo will b capabl and willing to supply tis? How will t gomtry of t tst-cas b dfind: will a D (cross sction) dscription b givn? will a full 3D CAD modl b supplid? will a finit lmnt ms b supplid? Wat ar t rsults w would lik to obtain? Do w nd to modl radiation at xcang (btwn structur and instrumnts) insid t capsul? Wic of t participants is abl and willing to do tis tst? Empy D.M., Skokova, K.A., Agrawal P., Swanson, G.T., Prabu D.K., Ptrson, K.H. and Vnkatapaty E., Small Prob Rntry Invstigation for TPS Enginring (SPRITE) 11-5 t Ablation worksop - 1

is an appropriate single phase forced convection heat transfer coefficient (e.g. Weisman), and h

is an appropriate single phase forced convection heat transfer coefficient (e.g. Weisman), and h For t BWR oprating paramtrs givn blow, comput and plot: a) T clad surfac tmpratur assuming t Jns-Lotts Corrlation b) T clad surfac tmpratur assuming t Tom Corrlation c) T clad surfac tmpratur assuming