scholarly journals Experimental Study of the Jet Engine Exhaust Flow Field of Aircraft and Blast Fences

2015 ◽  
Vol 27 (2) ◽  
pp. 181-190 ◽  
Author(s):  
Haifu Wang ◽  
Liangcai Cai ◽  
Xiaolei Chong ◽  
Hao Geng
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Wind Velocity ◽  
Maximum Rate ◽  
Dynamic Pressure ◽  
Jet Flow ◽  
Engine Exhaust ◽  
Jet Engine ◽  
Jet Nozzle

A combined blast fence is introduced in this paper to improve the solid blast fences and louvered ones. Experiments of the jet engine exhaust flow (hereinafter jet flow for short) field and tests of three kinds of blast fences in two positions were carried out. The results show that the pressure and temperature at the centre of the jet flow decrease gradually as the flow moves farther away from the nozzle. The pressure falls fast with the maximum rate of 41.7%. The dynamic pressure 150 m away from the nozzle could reach 58.8 Pa, with a corresponding wind velocity of 10 m/s. The temperature affected range of 40°C is 113.5×20 m. The combined blast fence not only reduces the pressure of the flow in front of it but also solves the problems that the turbulence is too strong behind the solid blast fences and the pressure is too high behind the louvered blast fences. And the pressure behind combined blast fence is less than 10 Pa. The height of the fence is related to the distance from the jet nozzle. The nearer the fence is to the nozzle, the higher it is. When it is farther from the nozzle, its height can be lowered.

An experimental study of suddenly expanded rectangular jet flow field

1991 ◽  
Vol 18 (1) ◽  
pp. 1-9
Author(s):  
E. Rathakrishnan ◽  
T.J. Ignatius ◽  
Channa Raju
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Jet Flow ◽  
Rectangular Jet

scholarly journals Numerical Simulation and Experimental Study on Flow of Polymer Aqueous Solution in Porous Jet Nozzle

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Minghui Wei ◽  
Chenghuai Wu ◽  
Yanxi Zhou
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Pure Water ◽  
Jet Flow ◽  
Rock Breaking ◽  
Water Jet ◽  
Drilling Process ◽  
Polymer Additive ◽  
Convergent Nozzle ◽  
Jet Nozzle

The addition of a polymer to the jet medium enhances its ability to break rock, and the structure of the nozzle plays a vital role in the full utilization of energy. In this paper, a self-propelled porous jet bit with a support plate is designed, which can prevent the drill bit from jamming due to the jet nozzle against the bottom of the well during the drilling process. And the structural design of the cone-converging nozzle is applied to the forward center nozzle. The polymer additive jet flow field and the pure water jet flow field were compared by numerical simulation and experimental investigation. The results show that the polymer additive jet has a longer isokinetic core, and the rock-breaking volume of the polymer additive jet is much larger than that of the pure water jet, and the optimal spray distance is increased. The forward central jet with the conical convergent nozzle structure has more efficient rock-breaking ability.

Experimental study of impinging jet flow field involving Converging and CD nozzle pair

2018 ◽  
Author(s):  
Malcolm Harmon ◽  
Vikas Nataraj Bhargav ◽  
Prabu Sellappan ◽  
Farrukh S. Alvi ◽  
Rajan Kumar
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Impinging Jet ◽  
Jet Flow

Numerical study of interaction between jet with rudders on slender body at hypersonic condition

2018 ◽  
Vol 32 (12n13) ◽  
pp. 1840019 ◽  
Author(s):  
Long-Fei Li ◽  
Jiang-Feng Wang ◽  
Fa-Ming Zhao ◽  
Yu-Han Wang
Keyword(s):  
Flow Field ◽  
Pressure Distribution ◽  
Free Stream ◽  
Numerical Study ◽  
Jet Flow ◽  
Numerical Results ◽  
Slender Body ◽  
Total Force ◽  
Amplification Factors ◽  
Jet Nozzle

In this paper, a numerical study of the interaction between transverse cold jets on slender body in front of or between X-shape rudders with rudders in the oncoming free stream is presented. Firstly, the flow field at different jet conditions is simulated and analyzed. Then, the total force and moment amplification factors of the corresponding slender body with jet at different locations are analyzed and compared with those results of non-jet flow. Numerical results show that interactions take a great effect to the configuration of the flow field around rudders and the pressure distribution on slender surface. Moreover, the force and moment amplification changes regularly along with the location of jet nozzle.

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