S弯喷管正后向红外辐射特征快速预测模型

doi:10.7527/S1000-6893.2023.29639

Abstract

Abstract:

To efficiently calculate the infrared radiation characteristics of serpentine nozzles with varying shielding properties during the early stages of infrared stealth design for exhaust systems， a rapid prediction model for the tail infrared radiation characteristics of serpentine nozzles has been developed. This model combines the image-based method and the one-dimensional flow field model. The former transforms the geometric shielding relationship of serpentine nozzles into pixel operations on multi-layer two-dimensional images， and the latter is established based on the compressible pipe flow and jet theory. The gas absorption and emission characteristics are calculated using the statistical narrow-band model. The impact of shielding properties on gas radiation is also considered by fitting functions for the length and volume of the gas-visible region. The computational efficiency and accuracy of the model are verified by comparison with the discrete transfer method. The results show that the rapid prediction model can shorten the computation time of the tail infrared radiation from several hours to about 1 s， and the outcomes of the model align well with the discrete transfer method in terms of trend and value. The maximum relative error in total infrared radiation intensity for different shielding properties of serpentine nozzles and various nozzle working conditions is only 6.5%. Furthermore， the maximum relative errors for wall radiation and gas radiation are 4.1% and 5.2%， respectively. The model also demonstrates good generalizability for axisymmetric and two-dimensional nozzles.

Key words: serpentine nozzle, infrared radiation, rapid prediction, image-based method, one-dimensional flow field model

CLC Number:

V231.1

Jie SHI, Li ZHOU, Jingwei SHI, Zhanxue WANG. Rapid prediction model for tail infrared radiation characteristics of serpentine nozzles[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(14): 129639-129639.

Figures/Tables 18

Fig.1

Fig.2

Fig.3

Table 1

Accuracy verification of image method

参数	理论投影面积/m²	计算投影面积/m²	相对误差/%
$A t$	0.050 402	0.050 580	0.35
$A c$	0.042 460	0.042 258	0.48
$A m$	0.004 096	0.004 084	0.29
$A b$	0.005 226	0.005 260	0.65
$A n$	0.106 708	0.107 193	0.45

Table 1

Fig.4

Fig.5

Table 2

Calculation conditions of spectral transmittance

Case No.	T/K	P/（10⁵Pa）	$F C O 2$	$F H 2 O$	l/cm
1	800	1.0	0.1	0.1	40
2	1 000	1.0	0.1	0.1	40
3	1 200	1.0	0.1	0.1	40

Table 2

Fig.6

Fig.7

Fig.8

Table 3

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

Fig.15

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计算方法	CFD计算/s	红外特征计算/s
离散传递法	5.838×10⁴	3.786×10³
快速预测模型	0	1.391

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Rapid prediction model for tail infrared radiation characteristics of serpentine nozzles

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