Fig.1

Time decay curve of DNS statistics for compressible isotropic turbulence and time-vorticity contour plot when t/τ=2

Fig.2

Time evolution of dynamic Smagorinsky model coefficient Cs for different filtering scales

Fig.3

Curves of dynamic sub-grid temperature variance model coefficient CT and correlation coefficient CR(CT) at different filtering scales

Fig.4

Variations of dimensionless sub-grid temperature variance real values and calculated values from dynamical temperature variance model over time at different filter scales

Fig.5

Variation of dimensionless sub-grid temperature variance true values and calculated values from dynamical temperature variance model at different filter scales when t/τ=10.5

Fig.6

Time evolution of gas components and temperature correlation coefficient in chemical-freezing isotropic turbulence flow field

Fig.7

Instantaneous Mach number and temperature contour map of jet flow field

Fig.8

Iso-surface of Q=107 colored with local temperature

Fig.9

Schematic diagram of jet structure and curves showing variation of various statistical parameters along flow direction at centerline and lip line

Fig.10

Radial temperature profile at various flow fields cross sections

Table 1

Calculation condition settings

Fig.11

Remote instantaneous infrared imaging and calculation error distribution of MSMGWB model in Case 2 （detection distance is 45 km）

Fig.12

Infrared radiation based on LES time-averaged flow field at different detection distances

Fig.13

Average infrared radiation based on instantaneous flow field at different detection distances

Fig.14

Distribution of percentage increase in infrared radiation calculated based on instantaneous flow field compared to results calculated based on time-averaged flow field

Fig.15

Influences of TRI and SGS-TRI in Case 1 at various detection distances

Fig.16

Influences of TRI and SGS-TRI in Case 2 at various detection distances

Fig.17

Characteristic analysis diagram of main contributing spectral lines at different detection distances