Research on Dynamic Characteristics and Control Scheme of Kerosene-Based Scramjet System

摘要

Scramjet is the ideal power system and the core component of hypersonic vehicle, but it has characteristics of severe operating conditions and high nonlinearity, and so on. This paper mainly investigated the dynamic characteristics and control scheme of the kerosene scramjet system with motor-pump pressurization and regenerative cooling, which is a competitive scheme for high combustion performance and long-duration thermal protection. The analysis of step response characteristics and time scale for kerosene supply system (including regenerative-cooling channel, motor-pump, and flow regulating valve) shows that, the dynamic characteristics of kerosene-based regenerative cooling are the predominate dynamic characteristics of scramjet system. On the basis of DOE (Design of Experiment) method and one-dimensional numerical model, parametric study of four-port kerosene injection effects on scramjet combustor indicates that, the objective functions (the combustion efficiency, the total pressure recovery coefficient, and the drag coefficient) cannot reach the optimal solution at the same time. Then, static RBF model was employed to fit the scramjet engine performance, and transfer function and quadratic polynomial model were employed to simulate dynamic characteristics of kerosene supply system. Based on the general simulation model of scramjet system, the stabilized state control circle of scramjet thrust was carefully designed. Generally, this work has a benefit to develop the integration design technology of scramjet system and study the system dynamic characteristics thoroughly.