西安建筑科技大学学报(自然科学版)

为研究新型飞机尾喷气流对混凝土道面的作用特性,在分析飞机尾喷口结构特性的基础上,得到了尾喷作用在道面表面的温度场,并运用有限元软件ABAQUS对道面温度应力进行了计算,根据发动机不同的工作状态,分析了尾喷温度场及道面板温度应力分布规律,发现尾喷口尺寸、尾喷口温度与温度场最大温度和道面板温度应力呈线性关系,道面上最大温度为269 ℃,最大温度应力为3.112 MPa; 运用MTS疲劳试验系统,对温度应力作用下道面混凝土的疲劳特性进行了试验研究,得到了荷载与寿命的关系曲线,并根据线性累积损伤假定,建立了机场道面在飞机尾喷疲劳作用下的寿命预测模型.

In order to study the action characteristics of the new aircraft wake on the concrete pavement, based on the analysis of the structural characteristics of the aircraft wake, the temperature field of the wake on the pavement surface is obtained, and the temperature stress of the pavement is calculated by using the finite element software ABAQUS. According to the different working conditions of the engine, the temperature field of the wake and the temperature stress distribution of the pavement are analyzed. It is found that the maximum temperature on the pavement is 269 ℃, and the maximum temperature stress is 3.112 MPa. The MTS fatigue test system is used to study the fatigue characteristics of pavement concrete under the action of temperature stress. The relationship curve between load and life is obtained, and the linear cumulative damage assumption is used. The life prediction model of airfield pavement under aircraft tail spray fatigue is established.

引言
1 尾喷温度场分布规律
2 温度应力计算
3 尾喷作用下道面的疲劳损伤试验研究
4 结论与展望

表1 不同发动机状态下尾喷口参数<br/>Tab.1 Parameters of tail nozzle under different engine conditions

表1 不同发动机状态下尾喷口参数
Tab.1 Parameters of tail nozzle under different engine conditions

图1 尾喷气流分布<br/>Fig.1 Distribution of tail gas flow

图1 尾喷气流分布
Fig.1 Distribution of tail gas flow

图2 尾喷气流温度分布<br/>Fig.2 Temperature distribution of tail gas flow

图2 尾喷气流温度分布
Fig.2 Temperature distribution of tail gas flow

表2 紊流系数表<br/>Tab.2 Turbulence coefficient table

表2 紊流系数表
Tab.2 Turbulence coefficient table

图3 尾喷气流温度场计算步骤<br/>Fig.3 Calculation procedure of temperature field of tail gas flow

图3 尾喷气流温度场计算步骤
Fig.3 Calculation procedure of temperature field of tail gas flow

图4 各截面温度场<br/>Fig.4 Temperature field of each section

图4 各截面温度场
Fig.4 Temperature field of each section

图5 截面最大温度随高度变化情况<br/>Fig.5 Change of maximum temperature of section with height

图5 截面最大温度随高度变化情况
Fig.5 Change of maximum temperature of section with height

图6 不同喷口温度下截面温度场分布云图<br/>Fig.6 Cloud chart of section temperature field distribution under different nozzle temperatures

图6 不同喷口温度下截面温度场分布云图
Fig.6 Cloud chart of section temperature field distribution under different nozzle temperatures

表3 不同发动机状态下截面最大温度<br/>Tab.3 Maximum temperature of cross section under different engine conditions

表3 不同发动机状态下截面最大温度
Tab.3 Maximum temperature of cross section under different engine conditions

图7 不同喷口半径下截面温度场分布云图<br/>Fig.7 Cloud chart of temperature field distribution in different nozzle radius

图7 不同喷口半径下截面温度场分布云图
Fig.7 Cloud chart of temperature field distribution in different nozzle radius

表4 不同喷口半径下截面最大温度<br/>Tab.4 Maximum temperature of section under different nozzle radius

表4 不同喷口半径下截面最大温度
Tab.4 Maximum temperature of section under different nozzle radius

表5 材料参数
Tab.5 Material parameter

图8 不同喷口温度下道面表层及板厚方向温度应力云图<br/>Fig.8 Temperature stress nephogram of surface layer and plate thickness direction under different nozzle temperatures

图8 不同喷口温度下道面表层及板厚方向温度应力云图
Fig.8 Temperature stress nephogram of surface layer and plate thickness direction under different nozzle temperatures

表6 不同发动机状态下截面最大温度应力<br/>Tab.6 Maximum temperature stress of cross section under different engine conditions

表6 不同发动机状态下截面最大温度应力
Tab.6 Maximum temperature stress of cross section under different engine conditions

图9 不同喷口半径下截面温度应力云图<br/>Tab.9 Cloud chart of temperature stress at different nozzle radius

图9 不同喷口半径下截面温度应力云图
Tab.9 Cloud chart of temperature stress at different nozzle radius

表7 不同喷口半径下截面最大温度应力<br/>Tab.7 Maximum temperature stress of section under different nozzle radius

表7 不同喷口半径下截面最大温度应力
Tab.7 Maximum temperature stress of section under different nozzle radius

表8 疲劳试验结果<br/>Tab.8 Fatigue test results

表8 疲劳试验结果
Tab.8 Fatigue test results

图10 P-lgN关系<br/>Fig.10 Relation of P-lgN

图10 P-lgN关系
Fig.10 Relation of P-lgN

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备注

引言

1 尾喷温度场分布规律

2 温度应力计算

3 尾喷作用下道面的疲劳损伤试验研究

4 结论与展望

期刊信息