Date of Award
6-2022
Document Type
Thesis
Degree Name
Master of Science in Astronautical Engineering
Department
Department of Aeronautics and Astronautics
First Advisor
Carl R. Hartsfield, PhD
Abstract
This research explores metal post-processing techniques to effectively reduce the large anomalous protrusions found in small additively manufactured low thrust rocket nozzles. Research has found that nozzles of this kind can experience losses in thrust of over 40%. Analytic theory of adiabatic nozzle flow with viscous losses for additively manufactured nozzles does not align with what has been found when tested experimentally. Compressible flow losses, such as shock wave formation inside the nozzle diverging cone, are likely the leading causes of such loss. Reduction in nozzle irregularities can likely yield results seen in analytic theory with similar performance to traditional subtractive manufacturing methods for low thrust nozzle design. Methods such as abrasive flow machining, electro-polishing, milling, wire EDM skimming, and high-temperature coatings are investigated and tested experimentally to compare laboratory results to analytic theory and traditionally manufactured low thrust nozzles. Nozzle performance increases showed to be greater than 20% across various explored post-processing techniques.
AFIT Designator
AFIT-ENY-MS-22-J-074
DTIC Accession Number
AD1177721
Recommended Citation
Gerhold, Tyler W., "Performance Study of Post-processed Additively Manufactured Low Thrust Nozzles" (2022). Theses and Dissertations. 5490.
https://scholar.afit.edu/etd/5490