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  • 1
    Publication Date: 2013-08-31
    Description: The effectiveness of two types of hypersonic decelerators is examined: mechanically deployable flares and inflatable ballutes. Computational fluid dynamics (CFD) is used to predict the flowfield around a solid rocket motor (SRM) with a deployed decelerator. The computations are performed with an ideal gas solver using an effective specific heat ratio of 1.15. The results from the ideal gas solver are compared to computational results from a thermochemical nonequilibrium solver. The surface pressure coefficient, the drag, and the extend of the compression corner separation zone predicted by the ideal gas solver compare well with those predicted by the nonequilibrium solver. The ideal gas solver is computationally inexpensive and is shown to be well suited for preliminary design studies. The computed solutions are used to determine the size and shape of the decelerator that are required to achieve a drag coefficient of 5. Heat transfer rates to the SRM and the decelerators are predicted to estimate the amount of thermal protection required.
    Keywords: AERODYNAMICS
    Type: NASA. Ames Research Center, Technical Paper Contest for Women 1992. Space Challenges: Earth and Beyond; p 145-170
    Format: application/pdf
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  • 2
    Publication Date: 2019-06-28
    Description: This paper describes the computational work performed on the simulation of a 16-in shock-tunnel facility. The numerical problems encountered during the computation of these flows are discussed along with the validity of some approximations used, notably concerning the reduction of the problem into problems of smaller dimensionality. Quasi-1D simulations can be used to help design experiments, or to better understanding the characteristics of the facility. An application to the design of a nonintrusive diagnostic is shown. The multidimensional flow transients computed include the shock reflection at the end of the driven tube, the shock propagation down the nozzle, and the breaking of the main diaphragm.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 92-4029
    Format: text
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  • 3
    Publication Date: 2019-06-28
    Description: The effectiveness of two types of hypersonic decelerators are computationally examined: mechanically deployable flares and inflatable ballutes. CFD is used to predict the flowfield around a solid rocket motor (SRM) with a deployed decelerator. The computations are performed with an ideal gas solver using an effective specific heat ratio of 1.15. The surface pressure coefficients, the drag, and the extent of the compression corner separation zone predicted by the ideal gas solver compare well with those predicted by the nonequilibrium solver. The ideal gas solver is computationally inexpensive and is shown to be well suited for preliminary design studies. The computed solutions are used to determine the size and shape of the decelerator that are required to achieve a drag coefficient of 5 in order to assure that the SRM will splash down in the Pacific Ocean. Heat transfer rates to the SRM and the decelerators are predicted to estimate the amount of thermal protection required.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 91-3303
    Format: text
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  • 4
    Publication Date: 2019-07-13
    Description: The paper presents evidence for a widespread common-age resurfacing that affected the entire boundary transition zone between the cratered highlands and northern lowland plains in eastern Mars. This resurfacing may have been contemporaneous with other major events elsewhere on Mars. It is noted that the oldest resurfacing event at N(1) of about 86,000 was much more efficient at removing larger craters in what is today the transition zone than it was in the cratered terrain; this implies that some difference in the nature of the crust had been established prior to this resurfacing event.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1987 - Mar 20, 1987; Houston, TX; United States
    Format: text
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  • 5
    Publication Date: 2019-07-13
    Keywords: AERODYNAMICS
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 29; 6; p. 773-779.
    Format: text
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