Analysis of the Allowable Time of Ground Temperature Recovery of a Certain Type of Rocket Engine

After a certain rocket engine stops ground precooling, the engine ground temperature extension duration cannot exceed a specific length, but extending the engine ground temperature recovery duration index can effectively relieve the launch pressure, which is of great significance for a reliable launch of a cryogenic rocket. To mine the specific length margin, this paper establishes the engine temperature recovery model based on numerical analysis and curve fitting method, which fully verifies the correctness of the model, and applies the model to calculate the minimum envelope value of the engine temperature recovery duration and the specific duration. The comparison concluded that the engine ground warming duration can be further extended.