Investigation of the structure of a strong electric discharge in a high-velocity air flow

2004 ◽  
Vol 39 (6) ◽  
pp. 988-998 ◽  
Author(s):  
V. I. Alfyorov
Keyword(s):  
Electric Discharge ◽  
High Velocity ◽  
Air Flow

scholarly journals Parameters of an electric discharge in a mixing layer of a supersonic air flow and an injected gas

2020 ◽  
Vol 1698 ◽  
pp. 012015
Author(s):  
A.A. Firsov ◽  
A.V. Efimov ◽  
N.S. Kolosov ◽  
S.B. Leonov
Keyword(s):  
Electric Discharge ◽  
Air Flow ◽  
Mixing Layer

Periodicities Changes of Nonlinear Oscillatory Behavior of a Fluttering Plate With Periodicity Ratio and Periodicity Change Rate

2013 ◽  
Author(s):  
Liming Dai ◽  
Lu Han
Keyword(s):  
High Velocity ◽  
Nonlinear Dynamic ◽  
Air Flow ◽  
Oscillatory Behavior ◽  
Dynamic Responses ◽  
Change Rate ◽  
System Parameters ◽  
Research Show

This study focuses on diagnosing the periodicity change of nonlinear dynamic responses of a fluttering plate excited by high-velocity air flow. The number and changing multiple-periodicities of the system with the implementation of Periodicity Ratio (PR) are investigated. The multiple-periodicity diagram is generated such that the periodicities and nonlinearity of the systems with respect to the system parameters can be graphically studied. The results of the research show that the number of period of periodicity of the systems increases when certain system parameters increase. Transitional characteristics of the systems are also investigated with Periodicity Change Rate as well.

Semiempirical Analysis of Liquid Fuel Distribution Downstream of a Plain Orifice Injector Under Cross-Stream Air Flow

1982 ◽  
Vol 104 (4) ◽  
pp. 788-795 ◽  
Author(s):  
Ming-hua Cao ◽  
Hong-kun Jiang ◽  
Ju-shan Chin
Keyword(s):  
Ambient Temperature ◽  
Test Data ◽  
High Velocity ◽  
Liquid Fuel ◽  
Air Flow ◽  
Liquid Sheet ◽  
Flow Path ◽  
Preliminary Design ◽  
Fuel Injector ◽  
Fuel Distribution

An improved semiempirical analysis is presented for the liquid fuel distribution downstream of a plain orifice fuel injector under a cross-stream air flow of uniform high velocity and constant ambient temperature. The analysis is based on a simplified “flat-fan spray” model (ε–ψ model). A ε–ψ model is proposed which assumes that the fuel injected through the orifice forms a flat-fan liquid sheet with an average fan angle 2ψ0. Once the droplets have been formed, the trajectory of individual droplets determines the fuel distribution downstream. The validity of the analysis is confirmed by comparison of calculations based on the ε–ψ model and test data obtained from fuel distribution experiments under cross-stream air flow of ambient temperature. The agreement is shown to be very good. The semiempirical analysis presented offers a very useful approach in the preliminary design of the fan air flow path portion of turbofan afterburners.

scholarly journals Experimental Study on Atomization of Plain Jet Injector Under High Pressure Co-Axial Air Flow

1987 ◽  
Author(s):  
Gui Xiang Yang ◽  
J. S. Chin
Keyword(s):  
Experimental Study ◽  
High Velocity ◽  
Drop Size ◽  
Air Flow ◽  
Test Chamber ◽  
Back Pressure ◽  
Air Pressure ◽  
Working Fluid ◽  
Air Velocity ◽  
Pressure Drops

An experimental study has been conducted on the effect of high back pressure on the spray characteristics of a plain jet injector under coaxial high velocity air flow. The air pressures tested range from 1 to 16 atm, the range of air velocity is 60–120 m/s, the pressure drops of injector tested are 200–2000 kpa. Working fluid is water. Injector hole diameter is 0.5 mm. The key feature of the experiment is using a convergent-divergent nozzle to maintain a high air pressure inthe test chamber and at the same time to maintain a high velocity air flow in the atomization zone. Such an experimental arrangement totally eliminates air and droplets recirculation in the test chamber and problem related to slow droplet settling in a commonly used pressurized vessel for high back pressure atomization research. The results show that SMD decreases monotonicly with the increase of back pressure or air velocity, at different air velocities, the effect of air pressure is different. The drop size distribution parameter N in Rosin-Rammler distribution decreases slightly with increase of back pressure or air velocity.

Longitudinal DC electric discharge in a supersonic air flow

2004 ◽  
Vol 49 (7) ◽  
pp. 833-838 ◽  
Author(s):  
V. L. Bychkov ◽  
L. P. Grachev ◽  
I. I. Esakov ◽  
A. A. Ravaev ◽  
K. V. Khodataev
Keyword(s):  
Electric Discharge ◽  
Air Flow

scholarly journals Semi-Empirical Analysis of Liquid Fuel Distribution Downstream of a Plain Orifice Injector Under Cross-Stream Air Flow

1982 ◽  
Author(s):  
Cao Ming-hua ◽  
Jiang Hong-kun ◽  
Chin Ju-shan
Keyword(s):  
Ambient Temperature ◽  
Empirical Analysis ◽  
High Velocity ◽  
Liquid Fuel ◽  
Air Flow ◽  
Liquid Sheet ◽  
Preliminary Design ◽  
Fuel Injector ◽  
Fuel Distribution ◽  
Semi Empirical

An improved semi-empirical analysis is presented for the liquid fuel distribution downstream of a plain orifice fuel injector under cross-stream airflow of uniform high velocity and constant ambient temperature. The analysis is based on a simplified “flat-fan spray” model (ε – ψ model). The ε – ψ model is proposed which assumes that the fuel injected through the orifice forms a flat-fan liquid sheet with an average fan angle 2 ψ0. Once the droplets have been formed, the trajectory of individual droplets determines the fuel distribution downstream. The validity of the analysis is confirmed by comparison of calculations based on the ε – ψ model and test data obtained from fuel distribution experiments under cross-stream air flow of ambient temperature. The agreement is shown to be very good. The semi-empirical analysis presented offers a very useful approach in the preliminary design of the fan air flow path portion of turbo-fan after-burners.

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