Concepts NREC

E-pumps

E-pumps

Electric driven pumps, often called e-pumps, are becoming more popular for smaller sized rocket propulsion in situations where launch system cost and simplicity are of paramount importance.  E-pump design considerations include optimum suction performance, efficiency, weight and cost. 

We have an e-pump prototype which has been tested with several propellants and can be customized to run a wide range of head/flow conditions. The pump can be modified with alternate bearings and seals for non-cryogenic service. 

This e-pump prototype is currently being used by several clients in development projects for aerospace applications and for cryogenic service in space.

Why e-pumps?

• Simplifies the pump
• No hot turbine
• Speed match between the pump and turbine no longer a concern
• Easier to control the pump speed, and hence where the pump operates
• Eliminates large temperature gradients between the hot turbine and cold pump
• Simplifies the engine
• At current battery energy/power density levels, e-pumps make sense for smaller engines (5-10K lbf thrust)

Concepts NREC has been active in the e-pump arena for 10 years with prior in-depth experience researching and developing conventional rocket turbopumps.