Thermal radiation characteristics of conformal dome in aero-dynamic environment
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摘要: 高温整流罩产生强烈的红外辐射，在探测器接收面上形成背景噪声，严重影响成像质量。为了评估气动热环境下高速飞行器共形整流罩热辐射对探测器性能的影响，建立了气动热环境下整流罩热流固耦合计算模型、整流罩热辐射发射以及传输模型，计算了整流罩非均匀温度场、形变场、应力以及应变场，仿真得到了共形整流罩热辐射对高速飞行器光学系统成像质量的影响。研究结果表明：随着时间的不断增长，探测器接收面的最大辐照度也逐渐增大。在第10 s时，0°攻角下共形整流罩热干扰辐照度最小值为0.094 W/m2，最大值为0.108 W/m2。和相同工况下的共形整流罩相比，球形整流罩10 s时的最大辐照度分别是椭球面和抛物面形整流罩最大辐照度的近12倍和7倍，即共形整流罩产生的干扰对探测系统的影响较小，不会对探测器的探测性能产生致命性的影响。Abstract: The high-temperature dome produces intense infrared radiation, which forms the background noise on the detector receiving surface and seriously affects the image quality. To assess the performance degradation as a result of aerodynamic heating of the conformal dome flying at high speed, this paper established the multi-physics coupling model of conformal domes under aerodynamic heating environment, the dome thermal radiation emission and transmission model. Based on these models, the temperature field, the stress field, the strain field and the deformation field of conformal domes were obtained, and the imaging quality of high-speed aircraft affected by heat radiation of conformal dome was analyzed. Results show that as time goes on, the maximum irradiance of the detector is increasing. At 10 s, the minimum value of the thermal interference irradiance of the conformal shroud at 0° attack angle is 0.094 W/m2, and the maximum value is 0.108 W/m2. Compared with conformal domes under the same working condition, the maximum irradiance of the spherical dome at 10 s is about 12 times and 7 times of the maximum irradiance of ellipsoid and parabolic dome, respectively. Conditions thermal radiation interference of the conformal dome has less effect on the detection system comparing with spherical dome, and does not have a fatal effect on the detection performance of the detector.
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Keywords:
- aero-optics /
- conformal dome /
- heat radiation /
- irradiance
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图 1 利用APDL建立椭球形整流罩
Figure 1. Flow chart of establishing ellipsoid fairing by using APDL
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图 2 椭球形整流罩第10 s温度场分布
Figure 2. Temperature field distribution of ellipsoid fairing 10 s
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图 3 椭球形整流罩第10 s等效应力场分布
Figure 3. Equivalent stress field distribution of the ellipsoid fairing 10 s
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图 4 椭球形整流罩第10 s等效应变场分布
Figure 4. Equivalent strain field distribution of ellipsoid fairing 10 s
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图 5 椭球形整流罩第10 s等效形变场分布
Figure 5. Equivalent deformation field distribution of ellipsoid fairing 10 s
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图 6 0°攻角2 s时椭球面整流罩热辐射在探测器接收面上3维及其对应的2维投影分布
Figure 6. On detector, 3-d and 2-d projection distribution of ellipsoid fairing thermal radiation at attack angle 0°and at time of 2 s
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图 7 0°攻角10 s时椭球形整流罩热辐射在探测器接收面上3维及其对应的2维投影分布
Figure 7. On detector, 3-d and 2-d projection distribution of ellipsoid fairing thermal radiation at attack angle 0°and at time of 10 s
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图 8 0°攻角1 s~10 s探测器接收面上最大辐照度变化趋势示意图
Figure 8. From 1~10 s, variation tendency of the biggest irradiance of detector surface at attack angle 0°
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图 9 10°攻角2 s时椭球形整流罩热辐射在探测器接收面上3维及其对应的2维投影分布
Figure 9. On detector, 3-d and 2-d projection distribution of ellipsoid fairing thermal radiation at attack angle 10°and at time of 2 s
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图 10 10°攻角10 s时椭球形整流罩热辐射在探测器接收面上3维及其对应的2维投影分布
Figure 10. On detector, 3-d and 2-d projection distribution of ellipsoid fairing thermal radiation at attack angle 10°and at time of 10 s
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图 11 10°攻角1 s~10 s探测器接收面上最大辐照度变化趋势示意图
Figure 11. From 1~10 s, variation tendency of the biggest irradiance of detector surface at attack angle 10°
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图 12 0°攻角3种典型面形共形整流罩热辐射随时间变化趋势图
Figure 12. Three typical surface shape conformal fairing heat radiation varies with time trend at attack angle 0°
表 1 300 K蓝宝石晶体的物理特性
Table 1 Physical properties of sapphire crystal at 300 K
密度
/(kg/m3)熔点/K 膨胀系数
/(10-6K-1)比热容
/(J/(kg·K))弹性模量
/GPa导热系数
/(W/(m·K))屈服强度
/(MPa)泊松比 3 980 2 050 5.3 750 344 36 300 0.27 
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