Green Propellant Zero-G Control Methods

The Green Propellent Zero-G Control Methods project is designed to respond to the goal of NASA and the broader space exploration industry to use more renewable, lower-toxicity propellants to replace standard, high-emission propellants. A human-tended flight test experiment will enable evaluation of renewable energy sources for use as propellants. The test aims to enable research into the non-linear wetting behavior of green propellants on tank walls and vanes. This learning may ultimately help to inform elements of future spacecraft design. 

Problem Statement Non-linear wetting behavior of the liquids on propellant tank walls and vanes is poorly understood, and especially so when it comes to novel green propellants. In particular, modeling stick-slip non-linearity is currently very difficult. Testing in microgravity is expected to inform future spacecraft propellant design. 

Technology Maturation Flight tests, bolstered by extensive and high-quality video, are expected to provide robust detail for post-flight analysis. It is expected that this combination of flight test and video material will give researchers better models to predict the behavior of green propellants and provide necessary understanding for improved design. 

This work is a continuation of previous flight testing under T0128. 

This is early/mid-stage (TRL 4) — the most realistic path in is NASA SBIR/STTR, which funds small businesses and research institutions to develop technology aligned with NASA's needs (equity-free, phased funding). Check whether a current SBIR/STTR solicitation topic overlaps with this project's technology area, or contact the project directly (above) to ask.

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