Accurate information on heat transfer data of combustion products in the solid rocket motor chamber is a crucial prerequisite for the engine thermal protection. A measurement technique was well developed to acquire steady-state heat flux data of two-phase flow and was used successfully in the hostile environment. Experimental heat flux measurement has been obtained with an innovative designed instrument by simulating the flow field of complex charging configuration. The total heat flux of combustion products in the chamber was brought away by the coolant and calculated by its enthalpy rise in this device. The data could be used to analyze the heat transfer phenomena in SRMs and provide boundary condition for establishing insulation erosion model.

In this paper, based on the nonlinear state feedback decoupling method, the dynamic transfer function of the inductor motor and pump control motor is setup, and the variable frequency hydraulic control system is realized to solve the contradiction between efficiency and dynamic characteristics using traditional control method. The simulation results show that this system has the better dynamic performance than VCS (Vector Control System). Then in order to optimize the system, the dynamic mathematical model including iron losses is built from the aspect of energy transmission. At last the condition of minimum loss of the system is deduced.

A new Phase-detecting device which can be used in real solid rocket motor (SRM) working environment was designed. By connecting this device up to an ablation experiment SRM, the impacted morphology of carbon layer surface was obtained and observed by SEM. Based on the demolishing pattern of the carbon layer surface, the real phase state of the carbon layer surface during SRM operation was also analyzed. The forming cause of this phase state and the mechanical capability of EPDM in real SRM environment were discussed briefly. Studies show that this new Phase-detecting device is a powerful tool for the research on insulator’s ablation theory and experiment, and the experimental results may provide a convictive evidence for ablation modeling.