Transpiration Cooling Methods for the SpaceLiner

Transpiration Cooling Using Liquid Water

“…The difference is 0:106 g=s, or 31%. Similar tests with the models with radius 0.0175 m resulted in a difference of 30% [1]. Fig.…”

“…Fig. 10 Test results using 0:2 g=s liquid water [1]. Table 4 Comparison between gas and liquid water as coolants [1] Temperature drop using 0:2 g=s water Temperature drop using 0:2 g=s nitrogen gas Temperature drop using 0:5 g=s nitrogen gas Temperature drop using 1 g=s nitrogen gas Fig.…”

“…The vapor enters the boundary layer, creating a protective layer which blocks the incoming heat flux. This effect is called "blocking" [1]. A schematic representation of this cooling principle is given in Fig.…”

“…12 Cooled model temperature distribution [1]. where _ q sp is the heat flux into the stagnation point in W=m 2 and R is the nose radius in m.…”

“…Aerodynamic performance of such vehicles can thus be greatly improved. An example of such a vehicle is the SpaceLiner, which is currently under investigation at the Space Launcher System Analysis (SART) department of DLR [1][2][3][4][5][6].…”