Numerical Investigation of High-Speed Oxy-Fuel Pulsed Detonation for Direct Power Extraction

2021 ◽  
Author(s):  
Shashank Karra ◽  
Sourabh V. Apte
Keyword(s):  
Numerical Investigation ◽  
High Speed ◽  
Direct Power ◽  
Power Extraction ◽  
Pulsed Detonation

Numerical Investigation of High-Speed Oxy-Fuel Pulsed Detonation for Direct Power Extraction

2020 ◽  
Author(s):  
Shashank K. Karra ◽  
Sourabh V. Apte
Keyword(s):  
High Speed ◽  
Kinetic Mechanism ◽  
Chemical Kinetic ◽  
Detonation Waves ◽  
Published Data ◽  
Stoichiometric Ratio ◽  
Direct Power ◽  
Riemann Solvers ◽  
Power Extraction ◽  
Reduced Mechanism

Abstract Oxy-fuel based pulse detonation system can be used for direct power extraction when combined with magnetohydrodynamics (MHD). A space-time conservation element solution element (CE/SE) method is used to investigate the operational envelope of oxy-coal detonations with gaseous methane as a surrogate fuel. The CE/SE method results in a consistent multidimensional formulation for structured/unstructured meshes by providing flux conservation in space and time without the need for complex Riemann solvers to capture solution discontinuities. A modified revised Jones-Lindstedt (JL-R) reaction mechanism accounting for radicals such as O, OH, and H was used as a reduced mechanism to simulate detonation waves from CH4−O2 combustion. The numerical scheme is first verified by comparing predictions with the ZND theory and other published data to show excellent agreement. For shock-induced detonation, the effect of driver shock temperature, pressure, stoichiometric ratio (ϕ) and initial driver shock length, on detonation initiation and propagation was investigated. The simulations accurately predicted detonation velocities, at various ϕ values, compared with available experimental data. The results show that higher gas temperatures and velocities are achieved through oxy-detonations compared to air. The chosen reduced chemical kinetic mechanism, that accounts for radical disassociation, is found to be critical in appropriately limiting heat release during oxy-combustion, thereby predicting detonation temperature and velocity accurately.

Integrated Vehicle Comparison of Turbo-Ramjet Engine and Pulsed Detonation Engine

2002 ◽  
Vol 125 (1) ◽  
pp. 257-262 ◽  
Author(s):  
T. Kaemming
Keyword(s):  
Life Cycle Cost ◽  
High Speed ◽  
Fuel Efficiency ◽  
Pressure Rise ◽  
Propulsion System ◽  
Cross Sectional ◽  
Pulsed Detonation Engine ◽  
Pulsed Detonation ◽  
Large Matrix ◽  
Detonation Engine

The pulsed detonation engine (PDE) is a unique propulsion system that uses the pressure rise associated with detonations to efficiently provide thrust. A study was conducted under the direction of the NASA Langley Research Center to identify the flight applications that provide the greatest potential benefits when incorporating a PDE propulsion system. The study was conducted in three phases. The first two phases progressively screened a large matrix of possible applications down to three applications for a more in-depth, advanced design analysis. The three applications best suited to the PDE were (1) a supersonic tactical aircraft, (2) a supersonic strike missile, and (3) a hypersonic single-stage-to-orbit (SSTO) vehicle. The supersonic tactical aircraft is the focus of this paper. The supersonic, tactical aircraft is envisioned as a Mach 3.5 high-altitude reconnaissance aircraft with possible strike capability. The high speed was selected based on the perceived high-speed fuel efficiency benefits of the PDE. Relative to a turbo-ramjet powered vehicle, the study identified an 11% to 21% takeoff gross weight (TOGW) benefit to the PDE on the baseline 700 n.mi. radius mission depending on the assumptions used for PDE performance and mission requirements. The TOGW benefits predicted were a result of the PDE lower cruise specific fuel consumption (SFC) and lower vehicle supersonic drag. The lower vehicle drag resulted from better aft vehicle shaping, which was a result of better distribution of the PDE cross-sectional area. The reduction in TOGW and fuel usage produced an estimated 4% reduction in life cycle cost for the PDE vehicle. The study also showed that the simplicity of the PDE enables concurrent engineering development of the vehicle and engine.

Component and System Modeling of a Direct Power Extraction System

2016 ◽  
Author(s):  
Omar Vidana ◽  
Mariana Chaidez ◽  
Brian Lovich ◽  
Jad Aboud ◽  
Manuel J. Hernandez ◽  
...  
Keyword(s):  
System Modeling ◽  
Extraction System ◽  
Direct Power ◽  
Power Extraction

scholarly journals Heat Transfer Characterization Methodology for an Oxy-Fuel Direct Power Extraction Combustion System

2018 ◽  
Vol 34 (5) ◽  
pp. 1313-1322
Author(s):  
Luisa Cabrera Maynez ◽  
Ahsan Choudhuri ◽  
Norman Love
Keyword(s):  
Heat Transfer ◽  
Combustion System ◽  
Direct Power ◽  
Power Extraction

scholarly journals Numerical Investigation of the Deposition Characteristics of Snow on the Bogie of a High-Speed Train

2020 ◽  
Vol 16 (1) ◽  
pp. 41-53
Author(s):  
Lu Cai ◽  
Zhen Lou ◽  
Nan Liu ◽  
Chao An ◽  
Jiye Zhang
Keyword(s):  
Numerical Investigation ◽  
High Speed ◽  
High Speed Train
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