The disturbances created by boundary layers behind incident shock waves are minimal but are multiplied in the postreflected-shock region and contribute to nonideal behaviors in this region. In this study, a boundary-layer model was used to confirm the link between predicted incident-shock boundary-layer growth and postreflected-shock pressure rise in shock tubes for a wide variety of nonreacting mixture compositions and experimental conditions. The results show that boundary-layer growth and, consequently, postreflected-shock pressure rise are strongly affected by the incident-shock Mach number and specific heat ratio γ of the mixture. In this study, mixtures of Ar, N 2 , and 0.21 N 2 / CO 2 were examined at experimental conditions of approximately 1400–1800 K at an average pressure of 1.73 atm. Although each mixture (with differing γ ) experienced the same range of postreflected-shock conditions ( T 5 and P 5 ), the Mach number span for each mixture was different. This Mach number byproduct of matching T 5 and P 5 for each mixture was a major cause of differences in boundary-layer growth behavior and resulting postreflected-shock pressure rise, with the CO 2 -laden mixture producing the largest postshock pressure (and temperature) rise. Additionally, the measured pressure rise for the high- CO 2 -content mixtures was an order of magnitude greater than for mixtures of pure Ar at the same experimental ( T 5 and P 5 ) conditions.


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    Title :

    Shock-Tube Boundary-Layer Effects on Reflected-Shock Conditions with and Without CO 2


    Contributors:

    Published in:

    AIAA Journal ; 55 , 3 ; 902-912


    Publication date :

    2017-01-19


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English