复合调节固冲发动机线性动力学建模与分析

Linear dynamic modeling and analysis of compound-adjustable ducted rocket

基于集总参数思想,建立了复合调节固冲发动机在飞行条件扰动及进气道/燃气发生器/喷管调节下的小扰动线性动力学模型。分析了动力学模型中各参数物理意义,研究了各时间常数与增益随飞行条件的变化规律。结果表明,大部分时间常数和增益随马赫数单调增加或减小,部分增益不随马赫数而变化,而部分时间常数和增益在封口马赫数前后呈现不同的变化规律;绝大多数时间常数和增益不随高度而变化。

Based on the conception of lumped-parameter, a dynamic model of compound-adjustable ducted rocket under the flight condition disturbance and inlet/gas-generator/nozzle adjustment was established. Physical significance of the parameters and the change rule of time constants and gains with flight condition were analyzed. The result shows that ： most of the time constants and gains increase or decrease monotonously with Math number, some keep constant with Mach number, and some show different change rules around design Mach number; almost all the time constants and gains keep constant with height.