Apparatus for simulating insulation ablation under condition of particle deposition in cavity in back wall of submerged nozzle

The invention discloses an apparatus for simulating insulation ablation under the condition of particle deposition in a cavity in a back wall of a submerged nozzle, which belongs to the technical field of rocket engines. The apparatus comprises a combustion chamber; one end of the combustion chamber is sealed, the other end of the combustion chamber is respectively in horizontal communication with a transition pipe and a deposition chamber from top to bottom, and the transition pipe is coaxially communicated with a channel pipe and a jet pipe in sequence; a propellant and an ignition cartridge bag used for igniting the propellant are arranged in the combustion chamber; and one end of the deposition chamber is communicated with the combustion chamber so as to form a through cavity, the other end of the deposition chamber is hermetically arranged, and the bottom inner wall and/or the inner wall of the sealed end of the deposition chamber is provided with an insulation test piece. The apparatus provided by the i