期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Numerical Simulation of the Supersonic Flows in the Second Throat Ejector-Diffuser Systems 被引量:10
1
作者 HeuydongKim ToshiakiSetoguchi 《Journal of Thermal Science》 SCIE EI CAS CSCD 1999年第4期214-222,共9页
The supersonic ejector-diffuser system with a second throat was simulated using CFD. A fully implicit finite volume scheme was applied to solve the axisymmetric Navier-Stokes equations and a standard k-E turbulence mo... The supersonic ejector-diffuser system with a second throat was simulated using CFD. A fully implicit finite volume scheme was applied to solve the axisymmetric Navier-Stokes equations and a standard k-E turbulence model was used to close the governing equations. The flow field in the supersonic ejectordiffuser system was investigated by changing the ejector throat area ratio and the secondary mass flow ratio at a fixed operating pressure ratio of 10. A convergent-divergent nozzle with a design Mach number of 2.11 was selected to give the supersonic operation of the ejector-diffuser system. For the constant area mixing tube the secondary mass flow seemed not to significantly change the flow field in the ejector-diffuser systems. It was, however, found that the flow in the ejector-diffuser systems having the second throat is strongly dependent on the secondary mass flow. 展开更多
关键词 compressible flow supersonic ejector supersonic diffuser shock waves internal flow.
原文传递
Supersonic Flow Structure in the Entrance Part of a Mixing Chamber of 2D Model Ejector 被引量:8
2
作者 Vaclav Dvorak Pavel Safarik 《Journal of Thermal Science》 SCIE EI CAS CSCD 2003年第4期344-349,共6页
The paper deals with experimental and numerical results of investigation into supersonic and transonic flow past a two-dimensional model ejector. Results of optical measurements show a flow structure and flow paramete... The paper deals with experimental and numerical results of investigation into supersonic and transonic flow past a two-dimensional model ejector. Results of optical measurements show a flow structure and flow parameter development in the entrance part of the mixing chamber of the ejector. Numerical results are obtained by means of both the straight solution of shock waves in supersonic flow field using classical relations of parameters of shock waves and the Fluent 6 program. Results of numerical solutions are compared with experimental pictures of flow fields. Flow structure development in the mixing chamber is analysed in detail. 展开更多
关键词 supersonic ejector shock waves shear layers mixing process boundary layer separation.
原文传递
Experimental Investigation on Starting Process of Supersonic Single-stage Air Ejector 被引量:2
3
作者 Zou Jian-jun Zhou Jin Lu Hui-qiang Hu Yong 《Journal of Thermal Science》 SCIE EI CAS CSCD 2012年第4期348-353,共6页
This paper deals with experimental study of flow field of starting process in two-dimensional, single-stage supersonic ejector on different air total pressure. Schlieren pictures of flow field were taken, static press... This paper deals with experimental study of flow field of starting process in two-dimensional, single-stage supersonic ejector on different air total pressure. Schlieren pictures of flow field were taken, static pressure distribu-tions on side wall were measured. The obtained results show that, on critical pressure, the starting main shock waves in ejector oscillated back and forth between the second throat and the middle section of the mixing chamber, it causes the pressure in the second half of the mixing chamber acutely fluctuated .When the working pressure of the active flow is higher than the critical starting pressure, ejector starts normally and the inner flow-field of the mixing chamber keeps stable and the shock waves in the second throat have a certain degree of oscillation . After ejector starts, the operating pressure of the active flow may be lower than the starting pressure . 展开更多
关键词 supersonic ejector start process flow-field shock waves
原文传递
The Effect of Secondary Flows on the Starting Pressure for a Second-throat Supersonic Ejector 被引量:1
4
作者 Chen Jian Wu Jiping +1 位作者 Wang Zhenguo Luo Wenlei 《Journal of Thermal Science》 SCIE EI CAS CSCD 2011年第6期503-509,共7页
The effect of the secondary flow on the starting pressure of a second-throat supersonic ejector has been investigated by adapting the height of the secondary flow inlet.The obtained results show that an optimum value ... The effect of the secondary flow on the starting pressure of a second-throat supersonic ejector has been investigated by adapting the height of the secondary flow inlet.The obtained results show that an optimum value of the secondary inlet height exists,and the starting pressure of the ejector becomes a minimum at that condition.Based on the results of the pressure measurements,a qualitative analysis has been made to clarify the flow behavior and the physical meaning of the performance diagram.It appears that the choking phenomenon of the secondary flow plays an important role in the starting process of the ejector.When the secondary inlet height is relatively small,the choked secondary flow and the supersonic primary flow could be employed to protect the static pressure in the suction chamber from being disturbed by the back pressure effect at a certain primary stagnation pressure,which is lower than the starting pressure for the case of the zero-secondary flow.However,as the secondary inlet height increases and exceeds a critical value,the static pressure in the suction chamber rapidly increases,and the starting pressure of the ejector increases accordingly. 展开更多
关键词 supersonic ejector Second-throat Starting pressure Hysteresis behavior Secondary flow choking
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部