Date of Award

Spring 2024

Access Type

Thesis - Open Access

Degree Name

Master of Science in Aerospace Engineering


College of Engineering

Committee Chair

Scott Martin

First Committee Member

William Engblom

Second Committee Member

Eric Perrell

College Dean

James Gregory


The effectiveness of porous bleeders in mitigating unstart phenomena and enhancing isolator effectiveness in a hypersonic scramjet was investigated. Through computational fluid dynamics simulations, the impact of porous bleeder design parameters such as pressure jump coefficient and bleeder size on isolator effectiveness and unstart prevention was evaluated. Results indicated that porous bleeders delayed flow separation and reduced adverse pressure gradients, thereby enhancing isolator performance. Additionally, porous bleeders demonstrated promising capabilities in preventing full unstart events and mitigating oscillatory unstart phenomena.