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MAE 5495: Launch Vehicle Analysis Lesson 4: Introduction to Thermodynamics

MAE 5495: Launch Vehicle Analysis Lesson 4: Introduction to Thermodynamics. Dr. Andrew Ketsdever UCCS. Rockets of the Day. Laser Propulsion Laser Pointer: 5 mW, Spot size 3-4 mm diameter For normal incidence and r = 1 F = 33 picoNewtons Isp = ∞ (almost)

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MAE 5495: Launch Vehicle Analysis Lesson 4: Introduction to Thermodynamics

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  1. MAE 5495: Launch Vehicle AnalysisLesson 4: Introduction to Thermodynamics Dr. Andrew Ketsdever UCCS

  2. Rockets of the Day • Laser Propulsion • Laser Pointer: 5 mW, Spot size 3-4 mm diameter • For normal incidence and r = 1 F = 33 picoNewtons Isp = ∞ (almost) • Solar Sail: P = 1358 W/m2; F/A = 9 microNewtons / m2 • Saturn V First Stage, F = 6.7 megaNewtons, Isp = 295 s

  3. Rockets of the Day • Alka Seltzer Rocket • NaHCO3 + H2O  CO2 + H2O + OH + Na (eventually) • Mprop = 0.01 kg • Vburnout = Vcrash = 0.5 g (TOF)2 = 5 m/sec • Itot = ∆p = mempty Vcrash = 0.05 kg x 5 m/s = 0.25 N-sec • F = I / tburn = 0.25 N-sec / 0.1 sec = 2.5 N • Isp = I / (Mprop go) = 2.5 sec • Shuttle Main Engines: F = 1.7 MegaNewtons, Isp = 450 sec

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