Infrared and Laser Engineering, Volume. 51, Issue 8, 20210659(2022)
Effect of baffle configuration on aerodynamic and infrared radiation characteristics of helicopter infrared suppressor
Figures & Tables(20)
Fig. 3. Schematic diagram of separate flow ejector structural parameters
Fig. 7. Static pressure contours for different bow-shaped baffle configurations
Fig. 8. Static temperature contours for different bow-shaped baffle configurations observed from the tail
Fig. 11. Velocity vector diagram with temperature coloring at the downstream of bow-shaped baffle cold side
Table 1. Structural parameters of two-dimensional mixing duct and the separate flow ejector
View tableView in ArticleTable 1. Structural parameters of two-dimensional mixing duct and the separate flow ejector
Component Description Value L Outlet width of mixing duct/mm 250 S The straight section of the mixing duct/mm 150 α Expansion angle of mixing duct/(°) 30 d1 Wing-shaped baffle width/mm 26 d2 Wing-shaped baffle length/mm 74 h Bow-shaped baffle hot side width/mm 92 β Expansion angle of bow-shaped baffle hot side/(°) 88
Table 2. Computed results of two-dimensional ejector nozzle pumping coefficient under different grid numbers
View tableView in ArticleTable 2. Computed results of two-dimensional ejector nozzle pumping coefficient under different grid numbers
Grid number (million) Pumping coefficient 1.86 0.26 5.87 0.25 8.20 0.24 10.34 0.24
Table 3. Pumping coefficient of components
View tableView in ArticleTable 3. Pumping coefficient of components
Components pumping coefficient Two-dimensional ejector nozzle Wing-shaped baffle Bow-shaped baffle Case 0 0.13 - - Case 1 0.56 0.068 - Case 2 0.60 0.066 0.091 Case 3 0.60 0.067 0.11 Case 4 0.28 0.048 −0.0087 Case 5 0.52 0.059 0.030
Table 4. Average temperature of components
View tableView in ArticleTable 4. Average temperature of components
Components temperature /K Two-dimensional mixing duct wall Wing-shaped baffle cold side Two-dimensional mixing duct outlet Case 0 333.21 - 568.28 Case 1 332.88 - 525.55 Case 2 327.03 420.49 521.89 Case 3 326.35 415.90 504.02 Case 4 453.72 607.98 564.37 Case 5 350.34 535.35 514.59
Table 5. Mixing characteristic coefficients for different bow-shaped baffle configurations
View tableView in ArticleTable 5. Mixing characteristic coefficients for different bow-shaped baffle configurations
Coefficient Total pressure recovery coefficient Thermal mixing efficiency Case 0 0.994 0.224 Case 1 0.915 0.755 Case 2 0.920 0.825 Case 3 0.923 0.837 Case 4 0.872 0.653 Case 5 0.910 0.758
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Suqi Chen, Yong Shan, Jingzhou Zhang, Zongyao Yang. Effect of baffle configuration on aerodynamic and infrared radiation characteristics of helicopter infrared suppressor[J]. Infrared and Laser Engineering, 2022, 51(8): 20210659
Paper Information
Category: Infrared technology and application
Received: Sep. 14, 2021
Accepted: --
Published Online: Jan. 9, 2023
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