Convective Heating of the LIFE Engine Target During Injection

Holdener, D S ; Tillack, M S ; Wang, X R

关键词: A CODES;    BAFFLES;    BOUNDARY LAYERS;    ENGINES;    HEAT FLUX;    HEAT TRANSFER;    HEATING;    LASERS;    MONTE CARLO METHOD;    NAVIER-STOKES EQUATIONS;    SIMULATION;    TARGETS;    THERMONUCLEAR REACTORS;    VALIDATION;    XENON;   

DOI  :  10.2172/1035283
RP-ID  :  LLNL-SR-508392-DRAFT
PID  :  OSTI ID: 1035283
Others  :  TRN: US1201129

美国|英语

来源: SciTech Connect

【 摘 要 】

Target survival in the hostile, high temperature xenon environment of the proposed Laser Inertial Fusion Energy (LIFE) engine is critical. This work focuses on the flow properties and convective heat load imposed upon the surface of the indirect drive target while traveling through the xenon gas. While this rarefied flow is traditionally characterized as being within the continuum regime, it is approaching transition where conventional CFD codes reach their bounds of operation. Thus ANSYS, specifically the Navier-Stokes module CFX, will be used in parallel with direct simulation Monte Carlo code DS2V and analytically and empirically derived expressions for heat transfer to the hohlraum for validation. Comparison of the viscous and thermal boundary layers of ANSYS and DS2V were shown to be nearly identical, with the surface heat flux varying less than 8% on average. From the results herein, external baffles have been shown to reduce this heat transfer to the sensitive laser entrance hole (LEH) windows and optimize target survival independent of other reactor parameters.