DIAMOND PORT JET INTERACTION WITH SUPERSONIC FLOW

• Published in: Applied mathematics and mechanics Vol. 26; no. 10; pp. 1332 - 1340
• Main Author: 樊怀国 张春晓 何川
• Format: Journal Article
• Language: English
• Published: College of Power Engineering, Chongqing University, Chongqing 400044, P. R. China%Department of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China 01.10.2005
• Subjects: 交互作用; 交叉流程; 菱形端口; 震动波; counter-rotating vortices; jet interaction with cross flow; interaction shock wave; mixing; diamond injector
• ISSN: 0253-4827; 1573-2754
• DOI: 10.1007/BF03246238

Interaction flow field of the sonic air jet through diamond shaped orifices at different incidence angles （10 degrees, 27.5 degrees, 45 degrees and 90 degrees） and total pressures （0.10 MPa and 0. 46 MPa） with a Mach 5.0 freestream was studied experimentally. A 90 degrees circular injector was examined for comparison. Crosssection Mach number contours were acquired by a Pitot-cone five-hole pressure probe. The results indicate that the low Mach semicircular region close to the wall is the wake region. The boundary layer thinning is in the areas adjacent to the wake. For the detached case, the interaction shock extends further into the freestream, and the shock shape has more curvature, also the low-Mach upwash region is larger. The vortices of the plume and the height of the jet interaction shock increase with increasing incidence angle and jet pressure. 90 degrees diamond and circular injector have stronger plume vorticity, and for the circular injector low-Mach region is smaller than that for the diamond injector. Tapered ramp increases the plume vorticity, and the double ramp reduces the level of vorticity. The three-dimensional interaction shock shape was modeled from the surface shock shape, the center plane shock shape, and crosssectional shock shape. The shock total pressure was estimated with the normal component of the Mach number using normal shock theory. The shock induced total pressure losses decrease with decreasing jet incidence angle and injection pressure, where the largest losses are incurred by the 90 degrees, circular injector.