Date of Award

Spring 1-1-2016

Document Type


Degree Name

Doctor of Philosophy (PhD)


Aerospace Engineering Sciences

First Advisor

Kenneth Jansen

Second Advisor

Peter Hamlington

Third Advisor

Ryan Starkey

Fourth Advisor

Brian Argrow

Fifth Advisor

John Farnsworth


The research contained in this thesis was performed in order to model the external compression axisymmetric inlet portion of a supersonic jet engine in a way that captures the effects of a full 3-D CFD model while maintaining the quickness of a lower dimensional model. This was accomplished by first creating high fidelity 3-D and 2-D models with the CFD code PHASTA. These models were used as base models to both verify and drive the creation of the lower dimensional model. The lower dimensional 1-D model, created in MATLAB, was developed by piecing together established methods with novel ones. In particular, a new approach was developed in order to properly model the dynamics of the inherently three dimensional external compression flow field. With comparison to the higher order PHASTA models, the lower order model proved capable of accurately modeling both the steady state and dynamic response of the the external compression supersonic inlet. This was accomplished approximately 13,000 times more efficiently than using the higher order CFD models. The results of this research provided a lower dimensional supersonic inlet model that maintains the dynamic accuracy of a higher order CFD model while exhibiting the benefit of quick execution time and adaptability allowed by its simpler construction.