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Flow Characteristics of Rectangular Underexpanded Impinging Jets

Journal of Thermal Science 2006年第1期15卷 59-64,30页

作者： Minoru YAGA Yoshio KINJO masumi tamashiro Kenyu OYAKAWA Dept. of Mechanical System Engineering University of the Ryukyus Okinawa 903-0213 Japan Mazda Motor Corporation Hiroshima 730-8670 Japan

In this paper, the flow fields of underexpanded impinging jet issued from rectangular nozzles of aspect ratio 1, 3 and 5 are numerically and experimentally studied. Two dimensional temperature and pressure distributions are measured by using infrared camera and the combination of a pressure scanning device and a stepping motor, respectively. The variation of the stagnation pressure on the impinging plate reveals that a hysteretic phenomenon exists during the increasing and decreasing of the pressure ratio for the aspect ratio of 3.0 and 5.0. It is also found that the nozzle of aspect ratio 1.0 caused the largest total pressure loss Pc /p0= 0.27 at the pressure ratio of Po /p0 = 6.5, where Pc is the stagnation center pressure on the wall, P0 the upstream stagnation pressure, Pb the ambient pressure. The other two nozzles showed that the pressure loss Pc / P0 =0.52 and 0.55 were achieved by the nozzles of the aspect ratio 3,0 and 5.0, respectively. The comparison between the calculations and experiments is fairly good, showing the three dimensional streamlines and structures of the shock waves in the jets. However, the hysteresis of the pressure variations observed in the experiments between the pressure ratio of 3.5 and 4.5 cannot be confirmed in the calculations.

关键词： compressible flow shock wave under-expanded rectangular impinging jet CFD.

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Experimental and Numerical Study of Twin Underexpanded Impinging Jets

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Journal of Thermal Science 2003年第3期12卷 255-259页

作者： Minoru Yaga Minoru Okano masumi tamashiro Kenyu Oyakawa Department of Mechanical Systems Engineering Faculty of Engineering University of the RyukyusSenbaru 1 Okinawa 903-0213 JAPANDepartment of Mechanical Systems Engineering Faculty of Engineering University of the RyukyusSenbaru 1 Okinawa 903-0213 JAPANDepartment of Mechanical Systems Engineering Faculty of Engineering University of the RyukyusSenbaru 1 Okinawa 903-0213 JAPANDepartment of Mechanical Systems Engineering Faculty of Engineering University of the RyukyusSenbaru 1 Okinawa 903-0213 JAPAN

In this paper, the dual underexpanded impinging jets are experimentally and numerically studied. The experiments were performed by measuring the unsteady and averaged wall static pressures and by visnalizing density fields using schlieren method. Numerical calculations were also conducted by solving unsteady three dimensional compressible Navier-Stokes equations with Baldwin-Lomax turbulence model. The main parametm''s for the dual jets are the non-dimensional distance between the two nozzle centers H/D covering 1.5, 2.0, the nozzle to plate separation L/D 2.0, 3.0,4.0 and 5.0 and the pressure ratio defined by Po/Pb 1.0-6.0, where D is the diameter of each nozzle exit, Po the stagnation pressure and Pb the back pressure. It is found that the agreement between the experiments and the calculations is good. The fountain flow at the middle of the two jets is observed both in the experiments and the calculation. According to FFT analysis of the experiments for the twin jets,relatively low frequgncy (up to 5 kHz) is dominant for H/D =1.5, L/D =2.0 and pressure rafio po/Pb =3.0 and 5.0,which is confLrmed by the experiments.

关键词：可压缩流体力学冲击波碰撞射流 CFD 计算流体力学喷射流动实验研究数值分析

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