Sanal Flow Choking and/or Sonic-fluid-throat Effect Reconfirms the Chapman–Jouguet Condition of Detonation Propagation and Ceases

Abstract

The fundamental understanding of the causes and consequences of phenomenon of the Sanal flow choking and/or Streamtube-flow-choking in non-reacting flows and cardiovascular system (Physics of Fluids 2022) sheds sparks on the analytical predictions of the Chapman–Jouguet conditions of detonation propagation and ceases. Closed-form analytical models correlating with the multitude of parameters are presented herein to assert the threshold condition of deflagration-to-detonation-transition (DDT) in all internal and external flow systems. Our study reveals that the undesirable and spontaneous detonation and/or explosion can be prohibited in all fluid flow systems by retaining the local total-to-static pressure ratio unceasingly lesser than the lower-critical-detonation-index (LCDI). The theoretical studies reveal that relatively high-viscosity and low specific-heat-ratio of the dominant species are susceptible to Sanal-flow-choking and/or Streamtube-flow-choking phenomena due to the sonic-fluid-throat effect in all fluid flow systems. At relatively low viscosity the flow Reynolds number will be quite high, and it generates significant turbulence. The flow turbulence enhances the boundary layer blockage factor causing an early Sanal flow choking and/or Streamtube-flow-choking. In silico results presented in our companion paper (AIAA 2023-1102) are reviewed herein and established conclusively the concept of Streamtube compression and flow choking due to the sonic-fluid-throat effect in reacting flow systems. The perception of sonic-fluid-throat effect described herein is a paradigm shift in chemical rocket propulsion and combustion science as it reconfirms the Chapman–Jouguet (1899) condition of detonation initiation and ends. The concept of sonic-fluid-throat effect in both internal and external flow systems explains physics of detonation chemistry and it further exposes the fundamental cause of environmental/supernova explosion.