+ Visit NASA.gov + Contact NASA   + Home Collection > NASA  Author > Chen, Yih-Kanq  Author > Wercinski, Paul  Author > Yang, Lily  Author > Yauber, Michael E.  NASA Center > Ames Research Center  Publication Year > 1991-2000 > 1999  Subject > S-U > Spacecraft Design, Testing And Performance  Availability Options > Online > PDF  Item/Media Type > NASA Report > Technical Memorandum (TM)  Item/Media Type > Technical Report  Note: Start a new navigation search by selecting a link above     Previous Record | Next Record + Back to Results   + Printer Friendly Title: A Fast Code for Jupiter Atmospheric Entry Analysis Author(s): Yauber, Michael E.; Wercinski, Paul; Yang, Lily; Chen, Yih-Kanq Abstract: A fast code was developed to calculate the forebody heating environment and heat shielding that is required for Jupiter atmospheric entry probes. A carbon phenolic heat shield material was assumed and, since computational efficiency was a major goal, analytic expressions were used, primarily, to calculate the heating, ablation and the required insulation. The code was verified by comparison with flight measurements from the Galileo probe's entry. The calculation required 3.5 sec of CPU time on a work station, or three to four orders of magnitude less than for previous Jovian entry heat shields. The computed surface recessions from ablation were compared with the flight values at six body stations. The average, absolute, predicted difference in the recession was 13.7 too high. The forebody's mass loss was overpredicted by 5.3 and the heat shield mass was calculated to be 15 less than the probe's actual heat shield. However, the calculated heat shield mass did not include contingencies for the various uncertainties that must be considered in the design of probes. Therefore, the agreement with the Galileo probe's values was satisfactory in view of the code's fast running time and the methods' approximations. NASA Center: Ames Research Center Publication Date: September 1999 Document Source: CASI Online Source: View PDF File Document ID: 20040081035 Publication Information: Number of Pages = 32 Report Number: A-99V0038; NASA/TM-1999-208796 Contract-Grant-Task Number: NAS2-14031 Price Code: A03 Keywords: FOREBODIES; ATMOSPHERIC ENTRY; MEASURING INSTRUMENTS; JUPITER ATMOSPHERE; HEAT SHIELDING; IN-FLIGHT MONITORING; GALILEO SPACECRAFT; INSULATION; Accessibility: Unclassified; No Copyright; Unlimited; Publicly available; Updated/Added to NTRS: 2005-10-13 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007