Steady Flow in Detonation Wave

Evans Ablow in Section II of their paper (Ref 66, p 131), entitled the Nonreactive Flow, defined the steady flow as a flow in which all partial derivatives with respect to time are equal to zero 

Section II of the paper is subdivided into the following subsections  

Flow Equations Equations of State Sound Speed. 

The differential equations of fluid dynamics express conservation of mass, conse rvation of momentum, conservation of energy and an equation of state. For an adiabatic reversible process, viscosity and heat conduction processes are absent and the equations are 2.1.1 to 2.1.13, inclusive 

A steady flow is called subsonic, sonic, or supersonic at a point as the magnitude of flow velocity If at that point is less than, equal to, or greater than the sound velocity at that point, in the particular coordinate system being used (Ref 66,p 131) 

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