Analysis of Vibrational Relaxation Data in Shock Wave Experiments

1959 ◽  
Vol 30 (6) ◽  
pp. 1631-1632 ◽  
Author(s):  
Kurt E. Shuler
Keyword(s):  
Shock Wave ◽  
Vibrational Relaxation ◽  
Relaxation Data

Analysis of vibrational relaxation regions by means of the Rayleigh-line method

1961 ◽  
Vol 10 (1) ◽  
pp. 25-32 ◽  
Author(s):  
N. H. Johannesen
Keyword(s):  
Heat Transfer ◽  
Shock Wave ◽  
Shock Waves ◽  
Vibrational Relaxation ◽  
Ideal Gas ◽  
Relaxation Frequency ◽  
Rayleigh Line ◽  
Exact Methods ◽  
Real Gas ◽  
Density Distributions

The physics of shock-waves with vibrational relaxation regions is recapitulated, and it is shown that exact methods of analysis can be developed from the classical Rayleigh-line equations by treating the real gas as an ideal gas with heat transfer. By using these methods to analyse experimental records of density distributions in relaxation regions, a large number of local values of the relaxation frequency, rather than a single over-all value, may be obtained from each shock-wave record.

Theoretical and experimental investigations of the reflexion of normal shock waves with vibrational relaxation

1967 ◽  
Vol 30 (1) ◽  
pp. 51-64 ◽  
Author(s):  
N. H. Johannesen ◽  
G. A. Bird ◽  
H. K. Zienkiewicz
Keyword(s):  
Shock Wave ◽  
Vibrational Relaxation ◽  
Experimental Investigations ◽  
Rayleigh Line ◽  
Dimensional Problem ◽  
Density Measurements ◽  
Wave Characteristic ◽  
One Dimensional ◽  
The One ◽  
Theoretical Results

The one-dimensional problem of shock-wave reflexion with relaxation is treated numerically by combining the shock-wave, characteristic, and Rayleigh-line equations. The theoretical results are compared with pressure and density measurements in CO2, and the agreement is found to be excellent.

Effects of Vibrational Relaxation on Weak Shock Wave Structure in Air

2011 ◽  
Author(s):  
Takeharu Sakai ◽  
Yoshikazu Makino ◽  
Yusuke Naka ◽  
Akira Murakami
Keyword(s):  
Shock Wave ◽  
Vibrational Relaxation ◽  
Fluid Dynamic ◽  
Species Conservation ◽  
Weak Shock ◽  
Wave Structure ◽  
Weak Shock Wave ◽  
Conservation Equations ◽  
Wide Range ◽  
Energy Equations

A computational fluid dynamic method is developed to calculate the long range propagation of weak shock wave with the vibrational relaxation in air. Vibrational relaxation kinetics among N2, O2, and H2O is accounted for by solving each species conservation equations with total mass, momentum and energy equations. The conservation equations are solved using a moving grid technique to capture the distortion of the wave during propagation. The propagation of the wave with an overpressure value typically observed in sonic boom on the ground is analyzed using the developed method. The computed results are mainly presented to show the ability to capture a dispersed nature in waves under different humidity conditions due to vibrational relaxation. The present result shows that the variation of a converged wave thickness dependent on a wide range of humidity can be recognized clearly by using the present method.

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