Abstract
Self-similar flows of a non-ideal gas driven by an expanding piston are studied. The equation of state for such gases is taken in the best suitable form that is found to be fairly accurate at low density region. The shock is assumed to be strong and propagating in a uniform medium at rest. The total energy of the flow between the shock and piston is assumed to be varying with shock radius obeying a power law. Both approximate analytical and numerical solutions are obtained for various values of the parameter that characterises the non-ideal nature of the gas. The influence of this parameter on not only the flow field but also on the shock density ratio, drag coefficient and pressure distribution on the piston surface is studied.
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