AAE450 Spring 2009

Hydrogen Peroxide vs. Hydrazine Attitude Control

ThrustersBrittany WaletzkoTranslunar/OTV PhaseWeek 5

Brittany Waletzko - ATT

AAE450 Spring 2009

The Scenario Need thrusters to despin/desaturate

reaction wheels during TLI Thrusters could be useful for attitude

control during lunar descent as well (~20Nm needed)

Propulsion considering using H2O2 as oxidizer use some for ATT

Brittany Waletzko - ATT<1>

AAE450 Spring 2009

Bottom-Line Figures

Brittany Waletzko - ATT<2>

Bottom line: Depending on final main engine selection, OTV phase ATT can accommodate with minimal project impact (level 3 changes)Future Work: Solidifying supporting hardware mass/power/cost figures, electrothermal

hydrazine thruster options, other design alternatives

Valves make both hydrazine and hydrogen peroxide throttleable Hydrazine less massive but significantly more expensive

AAE450 Spring 2009

Questions?

Brittany Waletzko - ATT<3>

AAE450 Spring 2009 Brittany Waletzko - ATT<4>

Backup Slides:

Preliminary Electrothermal Hydrazine Thruster Research

AAE450 Spring 2009 Brittany Waletzko - ATT<5>

Size and Mass Comparison: N2H4 and H2O2

AAE450 Spring 2009

Primary References Monopropellant Hydrazine Thrusters. Astrium Space Propulsion. 21 Jan 2009.<http://cs.astrium.eads.net/sp/SpacecraftPropulsion/MonopropellantThrusters.html> Rocket Research Corporation. "Final Report for Monopropellant Hydrazine

Thruster System," 1965. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19670030394_1967030394.pdf

Eric Wernimont, Ph.D. General Kinetics, Inc.: Huntington Beach, CA. Email Correspondence 7 Feb - 10 Feb 2009.

Astronautix. “Hydrazine” <http://www.astronautix.com/props/hydazine.htm> <http://www.marotta.com/DataSheets/MV100series.htm> <http://www.circlesealcontrols.com/products/atkomatic_valves/pdf/

cscatkoc_2007-10_lo.pdf> “Electrothermal Hydrazine Data” <http://www.lr.tudelft.nl/live/pagina.jsp?

id=6cf1d7c6-dd9a-432b-b40e-02f4f8ed0d0d&lang=en>

Brittany Waletzko - ATT<6>