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The Flying Carpet: Aerodynamic High-Altitude Solar Reflector Design Study
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 19, 2017 by SAE International in United States
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Our concept studies indicate that a set of reflectors floated in the upper atmosphere can efficiently reduce radiant forcing into the atmosphere. The cost of reducing the radiant forcing sufficiently to reverse the current rate of Global Warming, is well within reach of global financial resources. This paper summarizes the overall concept and focuses on one of the reflector concepts, the Flying Carpet. The basic element of this reflector array is a rigidized reflector sheet towed behind and above a solar-powered, distributed electric-propelled flying wing. The vehicle rises above 30,480 m (100,000 ft) in the daytime by solar power. At night, the very low wing loading of the sheets enables the system to stay well above the controlled airspace ceiling of 18,288 m (60,000 ft). The concept study results are summarized before going into technical issues in implementation. Flag instability is studied in initial wind tunnel experiments. This has forced evolution of the concept to one similar to a hang-glider, the sheet supporting the propelled wing at very low flight speed. Later designs may dispense with the wing altogether. Lift-induced drag can be minimized by joining several elements together in flight to create a large aspect ratio, and by staggering elements in flight as long-distance birds do, with swarm flight control. The primary parameter is the areal density that can be achieved for the reflector sheet under aerodynamic loads. Successful designs can be closed even with 2-mil Mylar sheets, but going to strengthened versions of solar sails would offer strong advantages. Mass-based cost estimation allows an upper bound on architecture cost by comparing equivalent number of launch masses of a well-known large space launch system. The next level of cost analysis shows that the manufacturing cost which is dominant, is best addressed through automotive industry techniques.
CitationKomerath, N., Hariharan, S., Shukla, D., Patel, S. et al., "The Flying Carpet: Aerodynamic High-Altitude Solar Reflector Design Study," SAE Technical Paper 2017-01-2026, 2017, https://doi.org/10.4271/2017-01-2026.
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- Stocker, T.F. et al, (2013). Climate Change 2013: The Physical Science Basis. IPCC Working Group WG1 Contribution to The Assessment Report AR5 of the Intergovernmental Panel on Climate Change. Cambridge University Press. 1552p
- Kopp, G.; Lean, J. L. (2011). "A new, lower value of total solar irradiance: Evidence and climate significance" (PDF). Geophysical Research Letters. 38.
- Early, J.T., "Space-Based Solar Shield To Offset Greenhouse Effect", Journal of the British Interplanetary Society, 42, pp. 567-569, 1989.
- Palti, Y., “Outer Space Sun Screen For Reducing Global Warming”. Patent Application US 2008/0203328 A1, Aug. 2008.
- Crutzen, P.J., Albedo enhancement by stratospheric sulfur injections: a contribution to resolve a policy dilemma? Climatic change. Springer, 77, 3, p. 211-220, 2006.
- Jones, C. D., Cox P. M., Essery R. L. H., Roberts D. L., and Woodage M. J. (2003), Strong carbon cycle feedbacks in a climate model with interactive CO2 and sulphate aerosols, Geophys. Res. Lett., 30, 1479, doi:10.1029/2003GL016867, 9
- Teller, E., Hyde, R., Wood, L. Global Warming and Ice Ages: Prospects for Physics-Based Modulation of Global Change, 22nd International Seminar on Planetary Emergencies Erice (Sicily), Italy, August 1997. Also, Lawrence Livermore National Laboratory, UCRL-JC-128715, 1997.
- Kunzig, R., A sunshade for planet Earth. Scientific American, Nature Publishing Group, 299,5, p.46-55, 2008.
- Frieler, K., Mengel, M., & Levermann, A. (2016). Delaying future sea-level rise by storing water in Antarctica. Earth System Dynamics, 7(1), 203.
- Grimm, R., Notz, D., Glud, R.N., Rysgaard, S., Six, K.D. Assessment of the sea-ice carbon pump: Insights from a three-dimensional ocean-sea-ice-biogeochemical model (MPIOM/HAMOCC). Elementa, 4, U.California Press, 2016.
- Lockett, Tiffany Russell, Few Alexander, and Wilson Richard. "Near Earth Asteroid Solar Sail Engineering Development Unit Test Program." (2017). Mylar 99% reflectivity
- Wright JL. “Space sailing.” Taylor & Francis; 1992.
- Isakowitz, S. J., “International reference guide to space launch systems”. NASA STI/Recon Technical Report A, 91, 51425, 1991.
- Bialki, C., “As Shuttle Sails Through Space, Costs Are Tough to Pin Down” Wall Street Journal, July 9, 2011.
- Atmosphere, US Standard. "NOAA-S/T76-1562." Washington, DC: US Govternment Printing Office (1976).
- Flittie, K., & Curtin, B. (1998, August). Pathfinder solar-powered aircraft flight performance. In 23rd Atmospheric Flight Mechanics Conference (p. 4446).
- Miura, R., Maruyama, M., Suzuki, M., Tsuji, H., Oodo, M., & Nishi, Y., Experiment of telecom/broadcasting mission using a high-altitude solar-powered aerial vehicle Pathfinder Plus. In Wireless Personal Multimedia Communications, 2002. IEEE 5th International Symposium, Vol. 2, pp. 469-473. October 2002.
- Romeo, G., Frulla, G., Cestino, E., & Corsino, G. (2004). HELIPLAT: design, aerodynamic, structural analysis of long-endurance solar-powered stratospheric platform. Journal of Aircraft, 41(6), 1505-1520.
- André, N. O. T. H. "Design of solar powered airplanes for continuous flight." PhD diss., ETH Zürich, 2008.
- Green, J. Laminar flow control-back to the future?. In AIAA 38th Fluid Dynamics Conference and Exhibit, p. 3738, June 2008.
- Lissaman, P. B. S., & Shollenberger, C. A. (1970). Formation flight of birds. Science, 168(3934), 1003-1005.
- Hummel, D. (1983). Aerodynamic aspects of formation flight in birds. Journal of theoretical biology, 104(3), 321-347.
- Blake, W., & Multhopp, D. (1998, August). Design, performance and modeling considerations for close formation flight. In 23rd Atmospheric Flight Mechanics Conference (p. 4343).
- Shukla, D., Hariharan, S., Patel, S., Hiremath, N., Komerath, N., Tradeoff Study of High Altitude Reflector Concepts. SAE AeroTech Conference, Ft. Worth, TX, September 2017.
- Scambos, T. A., Hulbe, C., Fahnestock, M., & Bohlander, J. (2000). The link between climate warming and break-up of ice shelves in the Antarctic Peninsula. Journal of Glaciology, 46(154), 516-530.
- Kawai, K., “Solar Energy Reflection Plate For Suppressing Global Warming”. US Patent Application US 2011/0013271 A1, January 2011.
- Akbari, H., Menon, S., & Rosenfeld, A. (2009). Global cooling: increasing world-wide urban albedos to offset CO 2. Climatic Change, 94(3), 275-286.
- Menon, S., Akbari, H., Mahanama, S., Sednev, I., & Levinson, R. (2010). Radiative forcing and temperature response to changes in urban albedos and associated CO2 offsets. Environmental Research Letters, 5(1), 014005.
- Staugaitis, C. L., & Kobren, L. (1966). Mechanical And Physical Properties Of The Echo II Metal-Polymer Laminate (No. NASA-TN-D-3409). National Aeronautics And Space Administration Goddard Space Flight Center.
- , “Carbon Footprint”. NatureFlex Renewable and Compostable Films. innoviafilms.com/NatureFlex/Environment/Carbon-Footprint.aspx Last viewed April 10, 2017
- , “Greenhouse Gases Equivalencies Calculator - Calculations and References”. Energy and the Environment, United States Environmental Pollution Agency. epa.gov/energy/greenhouse-gases-equivalencies-calculator-calculations-and-references. Last Viewed April 10, 2017.
- , “Defense Manufacturing Management Guide For Program Managers”. October 16, 2012. Department of Defense, United States of America. Acquisition Community Connection. acc.dau.mil Viewed April 9, 2017.
- Cimperman, J.S., Building a Goodyear Blip - Fast. Plain Dealer Guest Writer, Cleveland.com, March 22, 2013. Viewed April 9, 2017.
- , “2017 Toyota Camry Features & Specs”. Toyota.com, last viewed April 9, 2017.
- Colozza Anthony, “Initial Feasibility Assessment of a High Altitude Long Endurance Airship”, Analex Corporation, Brook Park, Ohio. NASA/CR-2003-212724
- U.S. Department of Commerce, “A Report on Thunderstorm Conditions Affecting Flight Operations”, April 1948.
- , “Clouds”, National Geographic. Last viewed July 19, 2017.
- , “Lightning & Atmospheric electricity Research”, NASA Global Hydrology Resource Center. Last viewed July 19, 2017.