A
thrust chamber injector of a hydrazine type low-thrust single-unit engine adopts a radial injection mode and structurally comprises injection pipes, a
thrust chamber and an injection disc, wherein the injection pipes are fixed to the injection disc and installed at the front end of the
thrust chamber, a thrust chamber head baffle is arranged at the front end of the thrust chamber, the injection disc is of an end cover structure capable of enveloping the front section of the thrust chamber, the injection disc is in matched connection with the front section of the thrust chamber, the front section of the thrust chamber is sleeved with the injection disc, an annular injection cavity is arranged between the injection disc and the front section of the thrust chamber, more than one circle of injection micropores are evenly formed in the periphery of the
barrel wall of the annular injection cavity corresponding to the front section of the thrust chamber, the injection pipes are circumferentially and evenly distributed and fixed to the injection disc, and spray nozzles of the injection pipes correspond to the annular injection cavity. A
propellant is radially injected through the micropores, reasonable
injection pressure drop can be provided under the condition that related
propellant flows are ensured, and the thrust chamber
injector is reasonable in structure and simple in manufacture, is easily retrofitted to be serialized, and can meet the
power demand of the single-unit engine.