Thermodynamic analysis of counter flow injection

Abstract

Present computational investigation is carried out to reveal the effect of jet and freestream parameters on flow field alteration and associated properties. Further, thermodynamic analysis is also performed to account the irreversibilities in lower and higher enthalpy flows and various opposing conditions with real gas effects. In this regard, a computationally efficient non-equilibrium real gas solver is developed which accounts five species and eleven chemical elementary reactions. After validation of this solver, simulations are performed for various parameters of jet and freestream to examine the real gas effect on flow field and different thermodynamic parameters such as entropy generation rate, exergy destruction etc. The computed result reveals that freestream parameters have minor effect on drag coefficient and flow field but there is monotonic variation in entropy generation rate and exergy destruction for constant momentum ratio of the jet. For given momentum ratio, jet parameters give small reduction in entropy generation rate and exergy destruction while minor alterations in flow field and drag coefficient are observed. Linear reduction in drag coefficient and sharp rise in entropy generation rate and exergy destruction is obtained with momentum ratio of the jet. These proposed thermodynamic parameters and drag coefficient portrayed opposite variation with given freestream or jet parameter for constant jet momentum ratio. Jet momentum ratio is noted to be the major governing parameter for the extent of jet penetration in the freestream flow which restructures the shock wave and recirculation zone resulting in significant drag reduction and flow field alterations for hypersonic reacting flows as well. Larger shock stand-off distance for higher jet momentum ratio gives lesser drag but results in higher entropy generation rate and exergy destruction which makes the process much more irreversible.