Nakamura, Tetsu (2010-05). Computational Analysis of Zel'dovich-von Neumann-Doering (ZND) Detonation. Master's Thesis. Thesis uri icon

abstract

  • The Transient Inlet Concept (TIC) involves transient aerodynamics and wave interactions with the objective of producing turbulence, compression and flow in ducted engines at low subsonic speeds. This concept relies on the generation and control of multiple detonation waves issuing from different ?stages? along a simple ducted engine, and aims to eliminate the need for compressors at low speeds. Currently, the Zel?dovichvon Neumann-Doering (ZND) steady, one-dimensional detonation is the simplest method of generating the waves issuing from each stage of the TIC device. This thesis focuses on the primary calculation of a full thermochemistry through a ZND detonation from an initially unreacted supersonic state, through a discontinuous shock wave and a subsonic reaction zone, to the final, reacted, equilibrium state. Modeling of the ZND detonation is accomplished using Cantera, an open-source object-oriented code developed at Caltech. The code provides a robust framework for treating thermodynamics, chemical kinetics, and transport processes, as well as numerical solvers for various reacting flow problems. The present work examines the effects of chemical kinetics on the structure of ZND detonation, by using a detailed chemical kinetics mechanism that involves 53 species and 325 simultaneous reactions (Gas Research Institute 3.0). Using a direct integration of the system of inviscid ordinary differential equations for the ZND detonation, I obtain results for the combination of different fuels (hydrogen and methane) and oxidizers (oxygen and air). The detailed thermochemistry results of the calculations are critically examined for use in a future induced-detonation compression system.
  • The Transient Inlet Concept (TIC) involves transient aerodynamics and wave
    interactions with the objective of producing turbulence, compression and flow in ducted
    engines at low subsonic speeds. This concept relies on the generation and control of
    multiple detonation waves issuing from different ?stages? along a simple ducted engine,
    and aims to eliminate the need for compressors at low speeds. Currently, the Zel?dovichvon
    Neumann-Doering (ZND) steady, one-dimensional detonation is the simplest
    method of generating the waves issuing from each stage of the TIC device.
    This thesis focuses on the primary calculation of a full thermochemistry through a ZND
    detonation from an initially unreacted supersonic state, through a discontinuous shock
    wave and a subsonic reaction zone, to the final, reacted, equilibrium state. Modeling of
    the ZND detonation is accomplished using Cantera, an open-source object-oriented code
    developed at Caltech. The code provides a robust framework for treating
    thermodynamics, chemical kinetics, and transport processes, as well as numerical solvers
    for various reacting flow problems. The present work examines the effects of chemical
    kinetics on the structure of ZND detonation, by using a detailed chemical kinetics
    mechanism that involves 53 species and 325 simultaneous reactions (Gas Research
    Institute 3.0). Using a direct integration of the system of inviscid ordinary differential
    equations for the ZND detonation, I obtain results for the combination of different fuels
    (hydrogen and methane) and oxidizers (oxygen and air). The detailed thermochemistry results of the calculations are critically examined for use in a future induced-detonation compression system.

publication date

  • May 2010