Solid rocket engine with controllable thrust

The invention discloses a solid rocket engine with controllable thrust, relates to a solid rocket engine with controllable thrust, and belongs to the field of variable thrust engine with fluid jet. The solid rocket engine with controllable thrust comprises a combustor, propellant, a heat insulating layer, a convergent section, a gland, outer wall of an exhaust pipe, secondary jet injection devices, an exhaust pipe throat liner sleeve, an exhaust pipe throat liner and a sealing device; the secondary jet injection devices are used for injecting the secondary jet into the exhaust pipe main flow through the convergent section, the exhaust pipe throat liner sleeve and the exhaust pipe throat liner; the secondary jet injection devices are fixedly connected to the two sides of the outer wall of the exhaust pipe symmetrically and are used for counteracting the influence to the engine thrust caused by injecting the secondary flow through the secondary jet injection devices. According to the solid rocket engine with controllable thrust, different exhaust pipes are replaced according to the actual thrust requirements, and the initial design thrusts of different engines are achieved; the real-time adjustment on engine thrusts is achieved by adjusting flow quantity of the secondary flow and pressure; the solid rocket engine with controllable thrust can be applied to equipment requiring a solid engine to possess the thrust regulation control.