The mixing-chamber length of a supersonic ejector for a zero ejection coefficient

1967 ◽  
Vol 13 (4) ◽  
pp. 303-305
Author(s):  
B. A. Balanin
Keyword(s):  
Chamber Length ◽  
Supersonic Ejector ◽  
Ejection Coefficient ◽  
Mixing Chamber

Experimental Determination of Geometric Parameters for an Annular Injection Type Supersonic Ejector

2006 ◽  
Vol 128 (6) ◽  
pp. 1164-1171 ◽  
Author(s):  
Sehoon Kim ◽  
Sejin Kwon
Keyword(s):  
Secondary Flow ◽  
Static Pressure ◽  
Area Ratio ◽  
Geometric Parameters ◽  
Cross Sectional ◽  
Chamber Length ◽  
Supersonic Ejector ◽  
Mixing Chamber ◽  
Flow Pressure ◽  
Contraction Angle

The effects of four geometric parameters of an annular injection supersonic ejector, namely, the primary nozzle exit-to-throat area ratio, the contraction angle of the mixing chamber, the cross-sectional area and L/D ratio of the second-throat on the performance parameters including the secondary flow pressure, the starting pressure and unstarting pressure were investigated experimentally. The starting pressure exhibits linearly proportional dependence on the throat area ratio when the mixing chamber length is less than a certain critical value. For a longer mixing chamber, the starting pressure is proportional to the mixing chamber length while the unstarting pressure depends on the throat area ratio only. The geometric parameters of the second-throat do not affect the static pressure of the secondary flow. This implies that the secondary flow is aerodynamically choked in the mixing chamber and the static pressure of the secondary flow is determined by the choking condition since the mixing chamber of the annular injection ejector is relatively long. Based on the findings by the experiment, a simplified analytical model was proposed to predict the secondary flow pressure. The predicted secondary flow pressure agrees reasonably well with the measurement for a small contraction angle of the mixing chamber.

scholarly journals Measurement and calculating of supersonic ejectors

2019 ◽  
Vol 213 ◽  
pp. 02097
Author(s):  
Lukas Vojta ◽  
Vaclav Dvorak
Keyword(s):  
Stagnation Pressure ◽  
The Other ◽  
Ansys Fluent ◽  
Supersonic Ejector ◽  
Air Inlet ◽  
Optimum Position ◽  
Constant Area ◽  
Mixing Chamber ◽  
Nozzle Position ◽  
Fluent Software

This paper deals with numerical and experimental investigation of the flow in an air to air supersonic ejector with constant area mixing chamber. The mixing chamber of previous ejector was completely repaired since a scratch from previous turning had been found. As a result, a new geometry of the mixing chamber was created. Several measurements were conducted with different nozzle position (NP): 1 mm, 2 mm and 3 mm. Furthermore, for a given NP, two different values of stagnation pressure of 200 kPa and 300 kPa at the primary air inlet were investigated in more detail. All numerical simulations were performed in the ANSYS Fluent software. It was found that the influence of the position of the nozzle influences the ejection factor only to a certain extent. For the other parameters of the ejector is also a need to find the optimum position of the nozzle. Repair of the mixing chamber has contributed to reduce the pressure difference at the wall of the mixing chamber.

scholarly journals NUMERICAL MODELING AND EXPERIMENTAL RESEARCH OF A LIQUID-LIQUID EJECTORS WITH A CURVED INITIAL MIXING CHAMBER AREA AND WITH DIRECT MIXING CAMERA

2020 ◽  
pp. 88-95
Author(s):  
Salar Kartas ◽  
◽  
Vladimir Panchenko ◽  
Yury Aleksandrov ◽  
◽  
...  
Keyword(s):  
Pressure Drop ◽  
Experimental Studies ◽  
Design Parameters ◽  
Layer By Layer ◽  
Relative Pressure ◽  
Initial Portion ◽  
Ansys Fluent ◽  
Ejection Coefficient ◽  
Mixing Chamber ◽  
Calculation Results

The article presents the results of numerical simulations and experimental studies of a liquid-liquid ejector with a curved initial portion of the mixing chamber. The experiment was conducted on liquid-liquid ejectors, models of which are made on a 3D printer, by the method of layer-by-layer deposition. The influence of possible manufacturing errors of the ejector on its characteristics is estimated. The issues of the use of liquid ejectors designed to work in the field of various predetermined ejection coefficients are considered. The theoretical ejection coefficient and the reasons for reducing the ejection coefficient in real ejectors are determined. The obtained dependences make it possible to determine the optimal design parameters of a liquid ejector and thereby increase its ejection coefficient. The relative pressure drop is shown at a low coefficient and at a high ejection coefficient. The calculated and experimental results of determining the ejection coefficient for liquid ejectors, which are widely used in various fields of technology, are presented. The results of numerical simulation of internal processes in the ANSYS-Fluent hydro-gasdynamic application package flowing in a single-phase liquidliquid ejector based on the study of a small-sized model are presented. As a result of the simulation, a good agreement was obtained between the calculation results of the model corresponding to the real prototype and the experimental data and comparison with the results of other authors. Several conclusions can be drawn from the results of the study. For example, a region of values of the ejection coefficient was found in which the relative pressure drop created by the ejector increases with an increase in the ejection coefficient.

Investigation of Two-Phase Flow in an Effervescent Atomizer

2014 ◽  
Author(s):  
Mona Hassanzadeh Jobehdar ◽  
Aly H. Gadallah ◽  
Kamran Siddiqui ◽  
Wajid A. Chishty
Keyword(s):  
Internal Combustion Engines ◽  
Two Phase Flow ◽  
Separation Bubble ◽  
Phase Flow ◽  
Two Phase ◽  
Chamber Length ◽  
Flat Base ◽  
Mixing Chamber ◽  
Wide Range ◽  
Effervescent Atomizer

Aerated-liquid atomization, also called “effervescent atomization”, is a technique that has a wide range of applications such as gas turbine combustors, internal combustion engines, furnaces and burners, and pharmaceutical sprays. We report on an experimental study conducted to investigate the two-phase flow in an Effervescent atomizer. A novel aerator tube base was implemented and tested. It is observed that the novel configuration suppresses the separation bubble at the trailing edge and results in more uniform and smaller bubbles compared to the standard flat base aerator. It has been found that the more uniform and smaller bubbles are generated as the mixing chamber length is reduced. It is concluded that by using a conical base aerator and by reducing the mixing chamber length, the spray steadiness and the atomization process can be significantly improved.

Flow structure of 2-D supersonic-supersonic ejector mixing chamber

2014 ◽  
Vol 26 (10) ◽  
pp. 101007
Author(s):  
刘盛田 Liu Shengtian ◽  
邱雄飞 Qiu Xiongfei ◽  
李金雪 Li Jinxue ◽  
胡兴伟 Hu Xingwei ◽  
郭建增 Guo Jianzeng
Keyword(s):  
Flow Structure ◽  
Supersonic Ejector ◽  
Mixing Chamber
Sign in / Sign up

Export Citation Format

Share Document