When modeling an aeroengine control system, effects of fuel metering unit are neglected or oversimplified, which most probably leads to unreliable simulation or experimental results. In order to well understand influences of fuel metering unit on performance of an aeroengine and to enrich the component-level model of a turboshaft aeroengine, a stepping motor controlled fuel metering unit is examined by combining process-based modeling and object-oriented modeling and is employed in the component-level engine model. Performances of the engine with and without the fuel metering unit are compared by simulation. The component-level engine model with the fuel metering unit characteristics considered meets the simulation requirements on the steady precision and can describe dynamics of the engine more precisely. A semi-physical experimental verification is implemented to confirm the influence of the fuel metering unit. The results show that simulation using the component-level engine model with the fuel metering unit sub-model is in accordance with the experiment, and that comparing to the engine model without fuel metering unit, the model with a fuel metering unit can extend the performance parameter response dozens of milliseconds.

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涡轴航空发动机燃油计量单元模型仿真与半实物验证

在对航空发动机控制系统建模时，燃料计量单元的影响被忽略或过度简化，这很可能导致不可靠的模拟或实验结果。为了更好地理解燃油计量单元对航空发动机性能的影响，丰富涡轴航空发动机的部件级模型，结合基于过程的建模和面向对象的建模，对步进电机控制的燃油计量单元进行了研究。在组件级引擎模型中使用。通过模拟比较了带有和不带有燃油计量单元的发动机的性能。考虑燃油计量单元特性的部件级发动机模型满足了稳态精度的仿真要求，可以更准确地描述发动机的动力学特性。进行了半实物实验验证，以确认燃油计量单元的影响。结果表明，采用带有燃油计量单元子模型的部件级发动机模型进行仿真与实验相符，与不带燃油计量单元的发动机模型相比，带有燃油计量单元的模型可以扩展性能参数响应几十毫秒。