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Simulations of Detonation Quenching and Re-initiation Using a Global Four-Step Combustion Model

Peswani, Mohnish G
http://orcid.org/0000-0002-4824-4712
http://rave.ohiolink.edu/etdc/view?acc_num=case1680380191292479

Abstract Details

2023, Doctor of Philosophy, Case Western Reserve University, EMC - Mechanical Engineering.
In the current study, the quenching and subsequent re-initiation of detonations in irregular premixed hydrocarbon mixtures are investigated using high-resolution numerical simulations. Since appropriate combustion modeling is crucial when simulating the reactive detonation phenomenon, a four-step combustion model is adopted here. First, an investigation of the four-step model is carried out for different reactive mixtures to highlight the model's applicability for detonation applications. In comparison with detailed chemistry mechanisms, the model demonstrates an ability to accurately predict the complete ignition process over a wide range of initial conditions. With the ignition structures and key combustion parameters correctly predicted, it is concluded that the four-step model is an effective and economical tool for studying complex explosion phenomena in situations where pre-combustion temperature and density are constantly changing. In the second half of the study, the four-step combustion model is coupled to an adaptive mesh refinement (AMR)-enabled compressible flow solver to simulate the re-initiation of quenched detonation waves propagating near the critical limit. Two experiments for detonation diffraction and detonation interaction with a single half-cylinder obstacle were successfully simulated. In both cases, the re-initiation of the attenuated detonation was invariably a result of transverse detonation waves. While past attempts using simple chemistry models have failed to capture transverse detonations, for these scenarios, our simulations have demonstrated that the four-step combustion model is able to capture this feature. Thus, it is concluded that to correctly model detonation re-initiation in characteristically unstable mixtures, an applied combustion model should contain at least an adequate description to permit the correct ignition and state variable response when changes in temperature and pressure occur. The re-initiation mechanisms for both cases, along with the propagation of the transverse detonation, are then analyzed in great detail.
Brian Maxwell (Advisor)
Shane Parker (Committee Member)
Steve Hostler (Committee Member)
Bryan Schmidt (Committee Member)
216 p.
Mechanical Engineering
Detonations, Computational Fluid Dynamics, Combustion

Recommended Citations

Citations

  • Peswani, M. G. (2023). Simulations of Detonation Quenching and Re-initiation Using a Global Four-Step Combustion Model [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1680380191292479

    APA Style (7th edition)

  • Peswani, Mohnish. Simulations of Detonation Quenching and Re-initiation Using a Global Four-Step Combustion Model. 2023. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1680380191292479.

    MLA Style (8th edition)

  • Peswani, Mohnish. "Simulations of Detonation Quenching and Re-initiation Using a Global Four-Step Combustion Model." Doctoral dissertation, Case Western Reserve University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=case1680380191292479

    Chicago Manual of Style (17th edition)

case1680380191292479
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© 2023, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.