飞行环境模拟系统多容腔流-固传热建模

Multi-Volume Fluid-Solid Heat Transfer Modeling for Flight Environment Simulation System

关键词:  高空模拟试验台  飞行环境模拟系统  多容腔建模  流-固传热  数值仿真

Key words:  Altitude ground test facilities  Flight environment simulation system  Multi-volume modeling  Fluid-solid heat transfer  Digital simulation

摘要:

为了提升高空台飞行环境模拟系统（FESS）数值仿真平台的置信度，提出了一种多容腔流-固传热的建模方法，该方法考虑了混合器气流掺混、流-固传热、管道压力损失等因素的影响；建立了包括调节阀流量特性、液压伺服系统、混合器、混合器出口导流栅流量特性、整流子系统、管道容腔模型在内的部件模型库，并基于该模型库构建了仿真平台。为了验证本文建模方法的有效性，采用两次掺混试验数据对仿真模型进行对比验证表明，仿真结果与试验测量结果动态变化趋势基本一致，且温度、压力的最大误差分别不大于2.5K，2kPa。为了分析FESS控制系统的能力，假定了一次典型的发动机试验条件来进行仿真分析，仿真结果表明，FESS控制系统具备进行发动机平飞加速和等马赫数爬升试验的能力。

Abstract:

To improve modeling precision of digital simulation platform of flight environment simulation system （FESS） of Altitude Ground Test Facilities （AGTF）， a multi-volume modeling method considering fluid-solid heat transfer is proposed. Considering the influence of mixer airflow mixing， fluid-solid heat transfer， and pipe pressure loss， a component model library was set up including control valve flow characteristic model， hydraulic servo system model， mixer model， mixer outlet air fence flow characteristic model， flow straightener subsystem model， and pipe volume model. A digital simulation platform of FESS is established based on the library. In order to verify the effectiveness of the modeling method proposed in this paper， two sets of mixing test data were used to do simulation verification， and the comparison results show that the dynamic variation trends of simulation and measurement result are basically the same and the maximum errors of temperature and pressure are less than 2.5K and 2kPa， respectively. To analysis the ability of FESS control system， a typical engine test condition is supposed to do the simulation analysis. The simulation results show that the FESS control system has the ability to do the Mach Dash and Zoom-Climb test.