Association of CN in an Expansion Wave

1966 ◽  
Vol 44 (4) ◽  
pp. 1327-1333 ◽  
Author(s):  
S. H. Bauer ◽  
W. S. Watt
Keyword(s):  
Expansion Wave

On expansion waves generated by the refraction of a plane shock at a gas interface

1967 ◽  
Vol 30 (2) ◽  
pp. 385-402 ◽  
Author(s):  
L. F. Henderson
Keyword(s):  
Expansion Wave ◽  
Plane Shock ◽  
Wave System ◽  
Expansion Waves ◽  
Reflected Wave ◽  
Expansion Fan ◽  
New Type ◽  
Self Similar ◽  
Fixed Boundaries ◽  
Mapping Theory

The paper deals with the regular refraction of a plane shock at a gas interface for the particular case where the reflected wave is an expansion fan. Numerical results are presented for the air–CH4 and air–CO2 gas combinations which are respectively examples of ‘slow–fast’ and ‘fast–slow’ refractions. It is found that a previously unreported condition exists in which the reflected wave solutions may be multi-valued. The hodograph mapping theory predicts a new type of regular–irregular transition for a refraction in this condition. The continuous expansion wave type of irregular refraction is also examined. The existence of this wave system is found to depend on the flow being self-similar. By contrast the expansion wave becomes centred when the flow becomes steady. Transitions within the ordered set of regular solutions are examined and it is shown that they may be either continuous or discontinuous. The continuous types appear to be associated with fixed boundaries and the discontinuous types with movable boundaries. Finally, a number of almost linear relations between the wave strengths are noted.

Unsteady Compressible Laminar Boundary-Layer Flow within a Moving Expansion Wave

AIAA Journal ◽  
1981 ◽  
Vol 19 (12) ◽  
pp. 1551-1557 ◽  
Author(s):  
Lang Mann Chang ◽  
Ching-Jen Chen
Keyword(s):  
Boundary Layer ◽  
Laminar Boundary Layer ◽  
Boundary Layer Flow ◽  
Expansion Wave ◽  
Layer Flow

Numerical study on transition structures of oblique detonations with expansion wave from finite-length cowl

2020 ◽  
Vol 32 (5) ◽  
pp. 056108 ◽  
Author(s):  
G. X. Xiang ◽  
X. Gao ◽  
W. J. Tang ◽  
X. Z. Jie ◽  
X. Huang
Keyword(s):  
Finite Length ◽  
Numerical Study ◽  
Expansion Wave ◽  
Transition Structures

Vibrational relaxation of carbon monoxide in an unsteady expansion wave

1977 ◽  
Vol 4 (3-4) ◽  
pp. 357-373 ◽  
Author(s):  
Adel E.M. Nasser ◽  
John W. Cleaver
Keyword(s):  
Carbon Monoxide ◽  
Vibrational Relaxation ◽  
Expansion Wave

Steam Dryer Acoustic Load Predictions in the Main Steam Line Break Event

2008 ◽  
Author(s):  
Jin Yan ◽  
Francis Bolger ◽  
Guangjun Li ◽  
Weimin Dai ◽  
Lev Klebanov
Keyword(s):  
Pressure Difference ◽  
Acoustic Pressure ◽  
Steam Line ◽  
Expansion Wave ◽  
Distribution Area ◽  
Ambient Environment ◽  
Design Basis ◽  
Acoustic Load ◽  
Main Steam Line ◽  
Main Steam

In nuclear reactor design, significant acoustic pressure loads impact the steam dryer hood as a result of the main steam line break outside containment (MSLB) event. When a main steam line breaks, it is assumed that the pipe instantaneously breaks completely open to the ambient environment (double-ended guillotine break). Due to the huge pressure difference between the inside of the reactor pressure vessel (RPV) and surrounding ambient environment, a shock wave will form at the break point and burst into the surrounding environment. At the same time, an expansion wave will travel upstream through the main steam line to the RPV, which results in a pressure reduction on the outside of the steam dryer hood. This expansion wave will create a substantial pressure difference between the two sides of the steam dryer hood with a resultant high stress on the hood. This differential pressure load is the acoustic load used in the structure design evaluations for this event. A key design basis requirement for the steam dryer is to maintain structural integrity during transient, and accident conditions. Demonstration that the steam dryers meet this design basis requires a calculation of the magnitude of the acoustic load on the steam dryer during a MSLB. In this study, Computational Fluid Dynamics (CFD) is used as an alternate calculation method to investigate the phenomenon of MSLB. Transient simulations with fine time steps were carried out. The results show that CFD is a useful tool to provide additional information on the acoustic load as compared to the traditional methods. From the CFD results, the minimum pressure value and its distribution area at different flow times was identified. Through the modeling, an understanding of the detailed transient flow field, particular the acoustic pressure field near the dryer hood during the MSLB was achieved.

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