Abstract
The velocity field and skin friction distribution around a row of five jets issuing into a crossflow from short (L/D ≃ 1) pipes inclined by 35° with respect to the streamwise direction, (i.e., “short holes”) are presented for two different jet supply flow directions. Velocity was measured using PIV, while the skin friction was measured with oil-film interferometry. The flow features are compared with previously published data for jets issuing through holes oriented normal to the crossflow and with numerical simulations of similar geometries. The distinguishing features of the flow field include a reduced recirculation region in comparison to the 90° case and markedly different in-hole flow physics. The jetting process caused by in-hole separations force the bulk of the jet fluid to issue from the leading half of the streamwise-angled injection hole, as previously reported by Brundage et al. (Tech Rep ASME 99-GT-35, 1999) and predicted by Walters and Leylek (ASME J Turbomach 122:101–112, 2000). The flow structure impacts the skin friction distribution around the holes, resulting in higher near-hole shear stress for a counter-flow supply plenum (jet fluid supplied by a high speed plenum flowing opposite to the free stream direction). In contrast, the counter-flow supply plenum was previously found to have the lowest near-hole wall shear stress for normal injection holes (Peterson and Plesniak in Exp Fluids 37:497–503, 2004b). Streamwise-angled injection generally reduces the near-hole skin friction due to the reduced jet trajectory resulting from the lower wall-normal jet momentum. Far downstream, the skin friction distributions are similar for the two injection angle cases.
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Abbreviations
- C f :
-
skin friction coefficient
- C f,approach :
-
skin friction coefficient of the approach boundary layer
- C f,x :
-
skin friction coefficient associated with streamwise wall shear stress component
- D :
-
hole diameter
- E/D :
-
distance from hole centerline to supply plenum endwall
- H/D :
-
supply plenum height
- L/D :
-
hole length-to-diameter ratio
- M :
-
blowing ratio = ρ j U j/ρ ∞ U ∞
- P/D :
-
hole spacing-to-diameter ratio
- Re θ :
-
momentum thickness Reynolds number
- U,V,W :
-
velocity components
- U j :
-
mean jet velocity
- U ∞ :
-
free stream velocity
- x,y,z :
-
spatial coordinates; origin at hole center
- α :
-
injection angle
- λ :
-
wavelength
- θ 0 :
-
initial boundary layer momentum thickness
- DSSN:
-
downstream spiral separation node
- SFD:
-
skin friction deficit
References
Andreopoulos J (1982) Measurements in a jet-pipe flow issuing penpendicularly into a cross stream. J Fluids Eng 104:493–499
Azzi A, Jubran BA (2003) Numerical modeling of film cooling from short length stream-wise injection holes. Heat Mass Transf 39:349–353
Berhe MK, Patankar SV (1996) A numerical study of discrete hole film-cooling. Tech Rep ASME 96-WA/HT-8
Bogard DG, Thole KA (2006) Gas turbine film cooling. J Propuls Power 22:249–270
Broadwell JE, Breidenthal RE (1984) Structure and mixing of a transverse jet in incompressible flow. J Fluid Mech 148:405–412
Brundage AL, Plesniak MW, Ramadhyani S (1999) Influence of coolant feed direction and hole length on film cooling jet velocity profiles. Tech Rep ASME 99-GT-35
Burd S, Simon T (1998) Measurements in film cooling flows: hole l/d and turbulence intensity effects. ASME J Turbomach 120:791–798
Cortelezzi L, Karagozian AR (2001) On the formation of the counter-rotating vortex pair in transverse jets. J Fluid Mech 446:347–373
Driver DM (2003) Application of oil-film interferometry skin-friction measurements to large wind tunnels. Exp Fluids 34:717–725
Fric TF, Roshko A (1989) Vortical structure in the wake of a transverse jet. J Fluid Mech 279:1–47
Guo X, Schröder W, Meinke M (2006) Large-eddy simulations of film cooling flows. Comput Fluids 35:587–606
Hale CA (1999) Short hole film cooling hydrodynamics and convective heat transfer in the near-hole region. Ph.D. dissertation. School of Mechanical Engineering, Purdue University, West Lafayette, IN
Hale CA, Plesniak MW, Ramadhyani S (2000a) Film cooling effectiveness for short holes fed by a narrow plenum. ASME J Turbomach 122:553–557
Hale CA, Plesniak MW, Ramadhyani S (2000b) Structural features and surface heat transfer associated with a row of short-hole jets in crossflow. Int J Heat Fluid Flow 21:542–553
Harrington MK, McWaters MA, Bogard DG, Lemmon CA, Thole KA (2001) Full-coverage film cooling with short injection holes. ASME J Turbomach 123:798–805
Jovanović MB, de Lange HC, van Steenhoven AA (2006) Influence of hole imperfection on jet cross flow interaction. Int J Heat Fluid Flow 27:42–53
Kohli A, Bogard D (1997) Adiabatic effectiveness, thermal fields, and velocity fields for film cooling with large angle injection. ASME J Turbomach 119:352–358
Kohli A, Thole KA (1998) Entrance effects on diffused film cooling holes. Tech Rep ASME 98-GT-402
Leylek JH, Zerkle RD (1994) Discrete-jet film cooling: a comparison of computational results with experiments. ASME J Turbomach 116:358–368
Margason RJ (1993) Fifty years of jet in cross flow research. Tech Rep AGARD-CP-534
Miao JM, Ching HK (2006) Numerical simulation of film-cooling concave plate as coolant jet passes through two rows of holes with various orientations of coolant flow. Int J Heat Mass Transf 49:557–574
Monson DJ, Mateer GG, Menter F (1993) Boundary-layer transition and global skin friction measurements with an oil-fringe imaging technique. Aerotech’93, Costa Mesa, CA, SAE 932550
Morton BR, Ibbetson A (1996) Jets deflected in a crossflow. Exp Thermal Fluid Sci 12:112–133
Naughton JW, Brown JL (1997) Uncertainty analysis for oil-film interferometry skin-friction measurement techniques. Tech Rep ASME FEDSM-3475
Naughton JW, Sheplak M (2002) Modern developments in shear-stress measurement. Progr Aerosp Sci 38:515–570
Peterson SD, Plesniak MW (2002) Short hole jet-in-crossflow velocity field and its relationship to film-cooling performance. Exp Fluids 33:889–898
Peterson SD, Plesniak MW (2004a) Evolution of jets emanating from short holes into crossflow. J Fluid Mech 503:57–91
Peterson SD, Plesniak MW (2004b) Surface shear stress measurements around multiple jets in crossflow using the fringe imaging skin friction technique. Exp Fluids 37:497–503
Pietrzyk JR, Bogard DG, Crawford ME (1988) Hydrodynamcic measurements of jets in crossflow for gas turbine film cooling applications. Tech Rep ASME 88-GT-194
Ramsey JW, Goldstein RJ (1971) Interaction of heated jet with a deflecting stream. J Heat Transf 93:365–373
Rudman M (1994) Numerical simulation of a jet in crossflow. Tech Rep International Colloquium on Jets, Wakes and Shear Layers. Commonwealth Scientific and Research Organization, Melbourne, AU
Sinha AK, Bogard DG, Crawford ME (1991) Film-cooling effectiveness downstream of a single row of holes with variable density ratio. ASME J Turbomach 13:442–449
Thole KA, Gritsch M, Schulz A, Wittig S (1997) Effect of a crossflow and the entrance to a film-cooling hole. J Fluids Eng 119:533–540
Walters DK, Leylek JH (1997) A systematic computational methodology applied to a three-dimensional film-cooling flowfield. ASME J Turbomach 119:777–785
Walters DK, Leylek JH (2000) A detailed analysis of film-cooling physics: part I—streamwise injection with cylindrical holes. ASME J Turbomach 122:101–112
Wittig S, Schulz A, Gritsch M, Thole KA (1996) Transonic film-cooling investigations: effects of hole shapes and orientations. Tech Rep ASME 99-GT-222
Wolochuck MC, Plesniak MW, Braun JE (1994) Evaluation of vortex shedding flow meters for HVAC applications. Tech Rep ME-TSPC/HERL-TR-94-1, Purdue University, West Lafayette, IN
Zilliac GG (1996) Further developments of the fringe-imaging skin friction technique. Tech Rep NASA TM-110425, NASA Ames Research Center, USA
Zilliac GG (1999) The fringe-imaging skin friction technique. Tech Rep NASA/TM-1999-208794, NASA Ames Research Center, USA
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Peterson, S.D., Plesniak, M.W. Flow structure and skin friction in the vicinity of a streamwise-angled injection hole fed by a short pipe. Exp Fluids 43, 627–638 (2007). https://doi.org/10.1007/s00348-007-0350-y
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DOI: https://doi.org/10.1007/s00348-007-0350-y