Title: Multi-scale modeling of energetic materials under high strain rate loadings
Abstract: Classical cycle analysis relies on the application of the first and second laws of thermodynamics to determine system states and system performance. For power producing devices, a common measure of performance relies on the first law balance, expressed as a ratio of power output to energy input (typically heating). One can also define a performance measure obtained from the second-law balance equation, expressed as a ratio of system performance relative to the ideal Carnot Cycle operating under the same conditions (across the same thermal reservoirs). To motivate a more unified approach, this talk will present a synthesis of both the first and second laws to show how cycle analysis may be conducted to give a universal measure of system performance. The talk will take the audience through a basic “thermo 101” for cycle analysis (refresher) then develop the unified approach, deriving all the same performance measures as a true synthetic construction. This will include Carnot, Rankine, Otto, Diesel, Stirling, and Brayton (jet) cycles. The talk will conclude with how the approach also extends to power-consuming cycles (refrigeration, heat-pump, air-conditioning, etc.). The motivation for this study comes from the author’s interest in performing unified performance analyses for high-speed propulsion systems (jet, ramjet, scramjet). For hypersonic technology development, a comprehensive, systems-level integration and systems engineering could benefit greatly from a unified approach to quantify system performance. The approach presented here provides the groundwork for true systems-level analyses and designs.