Study of Interaction between Supersonic Flow and Rods or Jets Surrounded by Porous Cavity

Nao Kuniyoshi, Minoru Yaga, Akito Koda, Isao Teruy, Masaaki Ishikawa

Department of Mechanical System Engineering, University of the Ryukyus, Okinawa, Japan.
Graduate School of Engineering and Science, University of the Ryukyus, Okinawa, Japan.
Makino Milling Machine Co., Ltd., Tokyo, Japan.

DOI: 10.4236/ojfd.2012.24A042                

Abstract

In this experiment, the effects of the combination of jets or rods and a porous cavity on the supersonic flow field are studied by means of visualization of schlieren method and the measurements of wall static pressures and the flow direction in the cavity with the thermal tuft probe. Three cases of jets or rods arrangements are tested in the experiments. As a result, a bow shock wave which is generated by the jets or rods is observed by mean of schlieren method. And it is confirmed that the expansion region appears downstream of the rods but is not in case of the jets pattern. Moreover the pressure ratios of starting shock wave passing through porous cavity for jets pattern differ from that of rods pattern. In the cavity, the flow direction at the measurement position in the cavity is always opposite to the main flow, as long as the starting shock wave is located upstream of the porous cavity for all cases. Difference in the backward flow ratio between the jets and rods patterns is observe after the starting shock wave passes through the porous cavity.

Keywords

Shock Wave; Compressible Flow; Porous Cavity; Bow Shock Wave

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	R. C. Rogers, D. P. Capriotti and R. W. Guy, “Experimental Supersonic Combustion Research at NASA Langley,” AIAA Paper, 1998, pp. 98-2506.
[2]	T. C. Hanson and G. S. Settles, “Particle Temperature and Velocity Effects on the Porosity and Oxidation of an HVOF Corrosion-Control Coating,” Journal of Thermal Spray Technology, Vol. 12, No. 3, 2003, pp. 403-415. doi:10.1361/105996303770348276
[3]	R. Honig, D. Theisen, R. Fink, R. Lachner, G. Kappler, D. Rist and P. Andrsen, “Experimental Investigation of a Scramjet Model Combustor with Injection through a Swept Ramp Using Laser-Induced Fluorescence with Tunable Excimer Lasers,” Symposium (International) on Combustion, Vol. 26, No. 2, 1996, pp. 2949-2956.
[4]	I. A. Waitz, F. E. Marble and E. E. Zukoski, “Investigation of a Contoured Wall Injector for Hypervelocity Mixing Augmentation,” AIAA Journal, Vol. 31, No. 6, 1993, pp. 1014-1021. doi:10.2514/3.11723
[5]	M. J. Barber, J. A. Schetz and L. A. Roe, “Normal, Sonic Helium Injection through a Wedge-Shaped Orifice into Supersonic Flow,” Journal of Propulsion and Power, Vol. 13, No. 2, 1997, pp. 257-263. doi:10.2514/2.5157
[6]	M. Yaga, S. Tabata, P. Doerffer and K. Oyakawa, “Numerical Simulation of Supersonic Mixing Enhancement with Porous Cavity,” AIAA-Paper, 2003, pp. 2003-3461.
[7]	M. Yaga, K. Yamamoto, P. Doerffer and K. Oyakawa, “Study of Interaction between Supersonic Flow and Rods Surrounded by Porous Cavity,” Journal of Thermal Science, Vol. 15, No. 4, 2006, pp. 324-330. doi:10.1007/s11630-006-0324-2
[8]	C. P. Ha?ggmark, A. A. Bakchinov and P. H. Alfredsson, “Measurements with a Flow Direction Boundary-Layer Probe in a Two-Dimensional Laminar Separation Bubble,” Experiments in Fluid, Vol. 28, No. 3, 2000, pp. 236242. doi:10.1007/s003480050383
[9]	N. Kuniyoshi, M. Yaga, A. Koda, I. Teruya and M. Ishikawa, “Experimental Study of Interaction between Supersonic Duct Flow and Jets Surrounded by the Porous Cavity,” Experimental Thermal and Fluid Science, Vol. 40, 2012, pp. 185-194. doi:10.1016/j.expthermflusci.2012.03.011