Alan Lach

Date of Award

12-1992

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Aeronautics and Astronautics

First Advisor

William C. Elrod, PhD

Abstract

This investigation developed a procedure and new analysis tools for identifying retrofit engine designs for use in existing airframes. The goal was to find a replacement engine for the air-to-air fighter, AAF, developed in the textbook Aircraft Engine Design. This paper introduced the ideas of solution surfaces, constraint/thrust diagrams, quality measures and linear regression analysis for the engine design problem. It considered the application of the jet engine design software ACSYS, MISS, and ONX along with statistical analysis software, SAS. Modeling techniques and linear regression analysis were used to minimize iteration while searching a wide range of design variables. Improvements to the design point engine selection process were made through the development of quality measures for choosing appropriate values for bypass ratio and compressor pressure ratio. The analysis tools were assembled into a design scheme for engine retrofit which was then demonstrated with a two-variable and a six-variable design example. The result of the study determined a new baseline engine design for the AAF with increased thrust and decreased fuel consumption. This design process was developed for use by design students in the academic environment.

AFIT Designator

AFIT-GAE-ENY-92D-19

DTIC Accession Number

ADA258822

Comments

The author's Vita page is omitted.

Download

Share

COinS