燃烧室高温燃油的密度变化特性及控制方法研究

针对燃烧室主动冷却通道高温燃油的密度变化特性进行了分析，给出了燃油温度和压力等参数的测量系统设计方法，利用能量守恒和等熵关系式设计了能够适应燃油密度大幅度变化的喷注压力调控方案。为确定燃油密度变化对调控方案的影响，在直连式燃烧试验平台开展了燃油喷注压力调控试验，试验过程中燃油测控系统工作正常，燃油喷注压力和密度大幅度变化过程与计算结果吻合较好，验证了高温燃油密度计算方法和测控方法的有效性。

Research on density variation and control method of high temperature fuel in combustor

The operating characteristics of the high temperature fuel in the active cooling channel and the variation of the fuel density are analyzed. The design methods of the fuel temperature and pressure measurement system are given, and the control scheme of the injection pressure which can adapt to the great change of the fuel density is designed using the balance equations of fuel energy and entropy. In order to determine the influence of the fuel density change on the control scheme, the fuel injection pressure control tests are carried out on the directly connected combustion test platform. Both the fuel measurement and control systems work normally during the test, and the processes of the fuel injection pressure and the density variation agree well with the prediction, which verifies the effectiveness of the high temperature fuel measurement, control method and the fuel density calculation method.