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This paper deals with a new bipropellant thruster using nitrous oxide (N2O) as an oxidizer and dimethyl ether (DME) as a fuel. Conventionally, bipropellants such as NTO/hydrazine have been used for thrusters. However, they are toxic and reactive to materials for tanks and tubes. Today, eco-friendly thrusters are required for safety and cost reduction. Hence, we proposed a new eco-friendly bipropellant thruster using N2O and DME. The bipropellant possibly reduces the cost for safety and allows easy handling because the propellant is neither toxic nor reactive to materials. N2O and DME, which are liquefied gas, are storable in a liquid form, and fed in a gaseous form simply by managing pressure and temperature. In this study, 0.4-N class thruster was prototyped to yield stable combustion and enhance performance. Using an injector consisting of a shower head and a subsequent orifice of 15 mm in diam., the prototype yielded a C* efficiency of 68.7 % and a specific impulse of 135 s at O/F=3.5.

Improvement of Combustion Stability of N<sub>2</sub>O/DME Bipropellant in Vacuum