Exergy Analysis and Optimization of a Scramjet Engine

Document Type

Article

Publication Date

2023

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Abstract

While traditional engine optimizations only consider the first law of thermodynamics and are typically conducted with thrust as the optimization objective, the highly-coupled nature of the high-speed vehicle serves as significant motivation for constructing an expression for the exergy destruction rate within a scramjet engine flowpath. This enables researchers to compare components with a "like currency" and easily consider where additional resources must be allocated. In the present work, the exergy destruction rate is derived as a synthesis of the energy and entropy balance equations. This is also combined with the exergy supply rate to form the second law efficiency, or exergetic efficiency. This parameter is then optimized using Sandia National Laboratory's Dakota toolkit, where individual flowpaths are created using the DoD HPCMP CREATE-MG Capstone mesh maker and the flowpaths are solved numerically using the DoD HPCMP CREATE-AV Kestrel multi-physics simulation software. This optimization yielded a 3% increase in exergetic efficiency over the traditional RC-22 geometry.

DOI

10.2514/6.2023-2019

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