Entropy-Based Performance Analysis of Chemical Rockets

Abbas, Mohammad; Riggins, David W.; Watson, Michael D.

doi:10.2514/6.2020-0759

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The adiabatic inlet total pressure loss model used for the turbojet engine is taken from [6]; this approximate model was developed by curve fitting over a wide representation of inlet data versus flight Mach number, as obtained from [35]. Captured streamtube characteristics, including spillage and additive drag, are determined by the specific fuel throttling, flight Mach number, and altitude operating point.…”

Section: Inletmentioning

confidence: 99%

“…Energy utilization formulations that are based on the global control volume approach have been used and validated for a wide range of applications and flow regimes, including multi-dimensional flows and chemically reacting flows [3]. Most applications have focused on hypersonic air-breathing vehicles with ram/scramjet propulsion systems [4] and rocket-powered vehicles [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Energy Utilization and Losses for Jet-Propelled Vehicles

Abbas

Riggins

2021

Aerospace

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The global control volume-based energy utilization balance for an aerospace vehicle is extended to allow for the analysis of jet-propelled vehicles. The methodology is first developed for analyzing the energy utilization and entropy generation characteristics of jet engines without airframe considerations. This methodology, when combined with separate energy utilization analysis for an unpowered airframe, allows for the assessment of a powered vehicle. Wake entropy generation for a powered vehicle is shown to be the summation of the wake entropy generation associated with the propulsion system (no airframe) and the unpowered airframe. The fundamental relationship between overall entropy generation and the flight conditions required for maximum range and endurance of a powered vehicle are also derived. Example energy utilization results obtained for a modeled turbojet engine in off-design operation are provided; wake and engine component entropy generation characteristics are directly related to engine operation and flight conditions. This engine model is then integrated with a legacy (twin-engine) Northrop F-5E Tiger II airframe. The overall entropy generation temporal rate for the vehicle is minimized, as predicted by our analysis, at flight conditions corresponding to maximum endurance. For flight conditions corresponding to maximum range, the overall entropy spatial rate is minimized.

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Section: Inletmentioning

confidence: 99%