Critical displacement parameters of a turbulent boundary layer

Improvement of the limiting relative friction law on a permeable plate with blowing of gas into a compressible turbulent boundary layer

“…( 2) that hero depends only on ~', but this parameter does not appear explicitly in the proposed approximations of Eqs. ( 3)- (6). =5 0,050 0,035 0,09.8 0,024 0,020 0,013 ,0,075] 0,035 ;0,055; 0,025 i0,044] 0,020 0,037i 0,016 !0,0321 0,014 0,020!…”

“…( 15) for ~i = i; 2, 3, 4, 5, 6) calculation from Eq. ( 17) for ~ = i, 0.66, 0.34, 0.24, and 7, respectively; experiment: 7) data of [8]; 8) data of [6]; 9) data of [16].…”

“…(17) Figure 2 compares calculations from Eq. ( 17) with the most reliable measurements of the critical separation parameters for supersonic flow over permeable surfaces with blowing of uniform and nonuniform gases [6][7][8]. The rather accurate test data of [9] are not shown in Fig.…”

“…The obvious physical concept behind this method was the reason that the development of a technology for making porous metals was accompanied by the proposal [1-5] of a large number of designs of various heat exchangers in which either the channels or the intertube space is filled with a permeable metal. Later the phenomenon of a substantial intensification of heat exchange was confirmed experimentally [6][7][8]. In particular, as a result of cooling provided by pumping water through a porous base, reliable operation of a laser reflector was realized at a thermal load qw = 8"107 W/m 2 in [8].…”

Improvement of the limiting relative friction law on a permeable plate with blown gas

“…( 2), ( 4) and ( 6); 2) blowing of nitrogen into air (@I = i); 3) blowing of carbon dioxide (@i = 0.66); 4) blowing of krypton (@i = 0.34); 5) blowing of Freon-12 (@i = 0.24); 6) blowing of helium (@x = 7.3). Experiment: 7) [2]; 8) [3]; 9) [4]; 2a) calculated from Eq. ( 14) for @i = i.…”