Research on safety of aero-engine oil tube under heating condition based on fluid-solid-thermal coupling
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摘要:
基于标准文件和流-固热耦合方法,对航空发动机通油管路处于防火试验标准规定的加热条件下的安全性进行了分析。通油管采用28 MPa挤压式无扩口组合导管,管内工质为RP-3航空煤油,选择高温标准烟气模拟加热导管的燃气。为模拟管路在不同操作条件或油泵故障的情况,设置了不同煤油进口流量进行计算。结果表明:在承受标准加热条件时,管壁温度分布不均,而随着煤油流量的降低,管壁的温度上升,出现传热恶化现象。温度升高会降低材料的强度,而温度不均匀分布则会产生热应力,增加导管工作的安全隐患。当煤油流量减小到一定大小时,管壁的等效应力将超过材料的屈服强度,管路存在较高的破裂的风险。
Abstract:The safety of the aviation engine oil tube under the heating conditions specified in fire test standards was analyzed based on standard documents and fluid-solid-thermal coupling method. Tube assembles for flareless connection, swaged type, 28 MPa, were used, the working fluid in the pipe was RP-3 aviation kerosene, and the high temperature standard flue gas was selected to simulate the gas for heating the tube. In order to simulate the situation of tube under different working conditions or pump failure, different kerosene inlet flow rates were set up for calculation. The results showed that the temperature distribution of the tube wall was uneven under standard heating conditions. With the decrease of kerosene flow rate, the temperature of the tube wall increased and the heat transfer deterioration occurred. The increase of tube wall temperature could reduce the strength of the material, and the uneven distribution of tube wall temperature could produce thermal stress, which may increase the safety hazard of the tube. When the kerosene flow rate was reduced to a certain amount, the equivalent stress of the tube wall could exceed the yield strength of the material, and the tube was prone to fracture.
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表 1 煤油进口工况
Table 1. Kerosene inlet conditions
工况
编号进口煤油
压力/MPa进口煤油
温度/K进口煤油
体积流量/(L/min)1 28 366.15 5.07 2 28 366.15 3.80 3 28 366.15 2.54 4 28 366.15 1.27 5 28 366.15 0.50 6 28 366.15 0.25 -
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