The Physics of Detonation Chemistry: A Radical Theory in Predicting the Deflagration to Detonation Transition, Environmental and Supernova Explosions

Kumar, VRS and Nichith, C and Vigneshwaran, S and Ajith, S and Sivabalan, M and Tharikaa, R and Sathyan, P and Vignesh, S and Vishnu, N and Hema Sai, N and Mohammed Niyasdeen, N and Sulthan, ARM and Roshan, VB and Pavithra, M and Amrith, M and Thianesh, UK and Anandmoorthi, - and Mohan, E and Pradeep Kumar, P and Bharath, RS and Oommen, C and Radhakrishnan, PK and Choudhary, SK and Vigneshwaran, R and Surya, B and Akshay Kumar, N and Deviparameswari, K and Sai Shankaran, B and Asher, PK and Merrish Aloy, A and Lohit, V (2021) The Physics of Detonation Chemistry: A Radical Theory in Predicting the Deflagration to Detonation Transition, Environmental and Supernova Explosions. In: AIAA Propulsion and Energy Forum, 2021, 9 -11 August 2021, Virtual, Online.

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Abstract

The theoretical finding of the Sanal flow choking PMCID: PMC7267099 is a methodological advancement in predicting the deflagration-to-detonation-transition (DDT) in the real-world-fluid flows (continuum/non-continuum) with credibility. Herein, we provide a proof of the concept of the Sanal-flow-choking and streamtube-flow-choking V.R.S.Kumar et al., Physics of Fluids 33, 036108 (2021); https://doi.org/10.1063/5.0040440 causing DDT in wall-bounded and free-external flows. Once the streamlines compacted, the considerable pressure difference attains inside the streamtube and the flow gets accelerated to the constricted region for satisfying the continuity condition set by the conservation law of nature. If the shape of the streamtube in the internal/external flow is similar to the convergent-divergent (CD) duct the phenomenon of the Sanal flow choking and supersonic flow development occurs at a critical-total-to-static pressure ratio (CPR) in yocto to yotta scale systems and beyond, which leads to shock wave generation or detonation as the case may be. It has been reported that at the lower critical detonation or hemorrhage index, the CPR of the reacting flow and the critical blood-pressure-ratio (BPR) of the subjects (human being/animal) are unique functions of the heat-capacity-ratio (HCR) of the evolved gas in the CD duct PMC7933821. In silico results are presented herein, with the reacting and non-reacting flow simulation of an internal flow system, to establish the proof of the concept of the Sanal-flow-choking and streamtube-flow-choking causing shock-wave/detonation. Parametric analytical studies have been carried out with different oxidizer-fuel ratio, chamber pressure, geometric variables, and multiple-step combustion for examining the possibilities of detonation due to the Sanal flow choking and streamtube flow choking. In all the case studies we have noticed that the Sanal flow choking and/or streamtube-flow-choking occurs when the total-to-static pressure ratio (TSPR) reaches the critical-pressure-ratio (CPR) in both reacting and non-reacting fluid flow systems. Note that the CPR for flow choking is a unique function of the lowest value of the heat capacity ratio of the local species. We concluded that the limit of the DDT can be extended by increasing the heat capacity ratio of the combustion gas and/or by decreasing the TSPR. The physics of detonation chemistry presented herein sheds light for exploring environmental and supernova explosions. In silico results reported herein provide an authentic answer to many unresolved research questions in the aerospace, astrophysics, biological, chemical, energy, environmental, material, nanoscience and technology. © 2021, American Institute of Aeronautics and Astronautics Inc.. All rights reserved.

Item Type:	Conference Proceedings
Publication:	AIAA Propulsion and Energy Forum, 2021
Publisher:	American Institute of Aeronautics and Astronautics Inc, AIAA
Additional Information:	The copyright for this article belongs to American Institute of Aeronautics and Astronautics Inc, AIAA
Keywords:	Calculations; Combustion; Decomposition; Ducts; Flow of fluids; Forecasting; Shock waves; Specific heat, Convergent-divergent duct; Critical pressure ratio; Deflagration to detonation transition; External flow; Flow choking; Fluid-flow; In-silico; Static-pressure ratio; Stream tubes; Supernovae explosions, Detonation
Department/Centre:	Division of Biological Sciences > Biochemistry Division of Chemical Sciences > Materials Research Centre
Date Deposited:	19 May 2022 06:46
Last Modified:	19 May 2022 06:46
URI:	https://eprints.iisc.ac.in/id/eprint/71893

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