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Large-Scale Liquid Hydrogen Testing of Variable Density Multilayer Insulation with a Foam Substrate

Large-Scale Liquid Hydrogen Testing of Variable Density Multilayer Insulation with a Foam Substrate

          
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About the Book

The multipurpose hydrogen test bed (MHTB), with an 18-cu m liquid hydrogen tank, was used to evaluate a combination foam/multilayer combination insulation (MLI) concept. The foam element (Isofoam SS-1171) insulates during ground hold/ascent flight, and allowed a dry nitrogen purge as opposed to the more complex/heavy helium purge subsystem normally required. The 45-layer MLI was designed for an on-orbit storage period of 45 days. Unique WI features include a variable layer density, larger but fewer double-aluminized Mylar perforations for ascent to orbit venting, and a commercially established roll-wrap installation process that reduced assembly man-hours and resulted in a roust, virtually seamless MLI. Insulation performance was measured during three test series. The spray-on foam insulation (SOFI) successfully prevented purge gas liquefaction within the MLI and resulted in the expected ground hold heat leak of 63 W/sq m. The orbit hold tests resulted in heat leaks of 0.085 and 0.22 W/sq m with warm boundary temperatures of 164 and 305 K, respectively. Compared to the best previously measured performance with a traditional MLI system, a 41-percent heat leak reduction with 25 fewer MLI layers was achieved. The MHTB MLI heat leak is half that calculated for a constant layer density MLI.Martin, J. J. and Hastings, L.Marshall Space Flight CenterCRYOGENIC FLUID STORAGE; MULTILAYER INSULATION; LIQUID HYDROGEN; FOAMS; MYLAR (TRADEMARK); DRYING; CONDENSING; SUBSTRATES...


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Product Details
  • ISBN-13: 9781723962448
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 280 mm
  • No of Pages: 92
  • Spine Width: 5 mm
  • Width: 216 mm
  • ISBN-10: 1723962449
  • Publisher Date: 23 Sep 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 236 gr


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