Combustion Instability in Lab-Scale HREs with Swirl Injectors: Pre- and Post-Chamber Effects
Elkhshen, M., Hashish, A., Ahmed, M., Ayad, A. (2025). Combustion Instability in Lab-Scale HREs with Swirl Injectors: Pre- and Post-Chamber Effects. EKB Journal Management System, 21(21), 1-11. doi: 10.1088/1742-6596/3070/1/012015
Mohamed Elkhshen; Anwer Hashish; Mahmoud Y. M. Ahmed; Ahmed Farid Ayad. "Combustion Instability in Lab-Scale HREs with Swirl Injectors: Pre- and Post-Chamber Effects". EKB Journal Management System, 21, 21, 2025, 1-11. doi: 10.1088/1742-6596/3070/1/012015
Elkhshen, M., Hashish, A., Ahmed, M., Ayad, A. (2025). 'Combustion Instability in Lab-Scale HREs with Swirl Injectors: Pre- and Post-Chamber Effects', EKB Journal Management System, 21(21), pp. 1-11. doi: 10.1088/1742-6596/3070/1/012015
Elkhshen, M., Hashish, A., Ahmed, M., Ayad, A. Combustion Instability in Lab-Scale HREs with Swirl Injectors: Pre- and Post-Chamber Effects. EKB Journal Management System, 2025; 21(21): 1-11. doi: 10.1088/1742-6596/3070/1/012015

Combustion Instability in Lab-Scale HREs with Swirl Injectors: Pre- and Post-Chamber Effects

International Conference on Aerospace Sciences and Aviation Technology
Volume 21, Issue 21, September 2025, Pages 1-11    PDF (2.62 M)
Document Type: Original Article
DOI: 10.1088/1742-6596/3070/1/012015
Authors
Mohamed Elkhshen* 1; Anwer Hashish2; Mahmoud Y. M. Ahmed3; Ahmed Farid Ayad2
1PhD student, Aerospace Engineering Department, Military Technical College, Egypt.
2Associate Professor, Aerospace Engineering Department, Military Technical College, Egypt.
3Professor. Aerospace Engineering Department, Military Technical College, Egypt.
Abstract
Combustion instability in hybrid rocket engines (HREs) remains a significant challenge, leading to pressure oscillations, vibrations, and potential engine failure. This study aims to mitigate instability while optimizing performance and safety by investigating the effects of oxidizers swirl injector, pre-combustion chamber, and post-combustion chamber lengths.
Using paraffin-based fuels and oxygen, the methodology is based on experimental lab-scale firing tests to analyze the impact of these parameters on combustion dynamics. The research integrates combustion theory, fluid dynamics, and chamber design to identify optimal configurations that reduce instability and enhance fuel regression rates. The study culminates in a proposed engine design that achieves stable combustion and improved performance, offering a pathway to safer and more efficient HREs.
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