Experimental Studies on Supersonic Cold Flow Mixing with Ramp Mixers

The mixing field in a supersonic cold flow past a set of compression–expansion ramps mounted at the downstream end of a strut, with staged injection at two tandem locations on the strut upstream of the ramps, has been experimentally investigated. Air and helium have been used to inject into a primary stream of air at an inlet Mach number of 2.0. Two test section geometries, one having a flow cross section twice that of the other, have been considered. The larger test section has wall struts as well as a middle strut, whereas the smaller one has the strut only in the middle. Terminal bulk pressure and wall static pressure measurements, and Schlieren visualization have been performed. The Mie scattering technique has been used to obtain the concentration contours of the injectant across the flow cross section at several axial locations downstream of the injection points. The results indicate better mixing with helium injection and less influence of the boundary layer along the test section walls with the la...

[1]  A. Mathur,et al.  Investigation of Base Pressure Behind the Injector Section in a Supersonic Combustion Chamber , 2001 .

[2]  James C. McDaniel,et al.  MOLE-FRACTION IMAGING OF TRANSVERSE INJECTION IN A DUCTED SUPERSONIC FLOW , 1991 .

[3]  David W. Riggins,et al.  Vortex generation and mixing in three-dimensional supersonic combustors , 1993 .

[4]  W. T. Rawlins,et al.  An experimental comparison of swept-ramp injectors in a model scramjet flow , 1996 .

[5]  Kelly Sabroske.  Seeding materials for use in laser anemometry , 1993 .

[6]  Atsuo Murakami,et al.  Alternating-Wedge Strut Injection for Supersonic Mixing and Combustion , 1999 .

[7]  R. Clift,et al.  Bubbles, Drops, and Particles , 1978 .

[8]  Raman Sujith,et al.  Mixing of high speed coaxial jets , 2001 .

[9]  Tetsuji Sunami,et al.  Supersonic mixing and combustion control using streamwise vortices , 1998 .

[10]  Noel T. Clemens,et al.  A planar Mie scattering technique for visualizing supersonic mixing flows , 1991 .

[11]  James C. McDaniel,et al.  Transverse injection into Mach 2 flow behind a rearward-facing step - A 3-D, compressible flow test case for hypersonic combustor CFD validation , 1991 .

[12]  Scott D. Stouffer,et al.  Effects of compression and expansion ramp fuel injector configuration on scramjet combustion and heat transfer , 1993 .

[13]  G. B. Northam,et al.  Evaluation of parallel injector configurations for Mach 2 combustion , 1992 .

[14]  John M. Seiner,et al.  Historical Survey on Enhanced Mixing in Scramjet Engines , 2001 .

[15]  Raman Sujith,et al.  Studies on freejets from nozzles for high-speed mixing applications , 2000 .

[16]  Christopher P. Goyne,et al.  Dual-Mode Combustion of Hydrogen in a Mach 5, Continuous-Flow Facility , 2001 .

[17]  James C. McDaniel,et al.  Experimental investigation of a supersonic swept ramp injector using laser-induced iodine fluorescence , 1994 .

[18]  S. Elghobashi,et al.  On the two-way interaction between homogeneous turbulence and dispersed solid particles. I: Turbulence modification , 1993 .