短舱管路接头耐火试验数值仿真预测

防耐火性能是航空发动机零部件满足适航要求的基本指标之一，在短舱火区内输送可燃液体的管路是其中的关键考核部件。为预测短舱管路耐火试验结果，评价管路接头火焰耐受性能，提出了开展标准火焰燃烧仿真获取第三类边界条件，通过管路流热耦合换热获取传热稳定后的流体域及固体域温度场，作为热边界条件进行结构变形分析考察管路接头接触状态的数值分析方法。通过直管火焰冲击试验及管路接头耐火试验对相关结果进行了验证。结果表明：出口管路温度预测结果误差小于3%,管路接头泄漏预测结果与试验结果一致。

Numerical Simulation Prediction of Fire Resistance Test of Nacelle Pipeline Joint

Fireproof /fire-resistance is one of the basic conditions for aircraft engine components to meet airworthiness requirements. The pipeline transporting flammable liquids in fire zone is the key component.In order to predict the fire resistance test results of the nacelle pipeline and evaluate the fire resistance performance of the pipeline joints, a numerical analysis method is proposed to simulate the standard flame to obtain the third kind of boundary conditions, use the fluid-thermo-solid coupling obtain the temperature field in the fluid and solid domains when the heat transfer is stable through fluid-thermal-solid coupling simulation and conduct structural deformation analysis as the thermal boundary conditions to inspect the contact state of the pipeline joints. Relevant results are verified by the flame impact test of straight pipe and the fire resistance test of pipeline joint. The error between predicted temperature and test results is less than 3%. The predicted result of pipeline joint leakage is consistent with the test.