Impact of Combustion Chamber Innovations on Jet Engine Development: A Comprehensive Review

The paper reviews the significant influence of combustion chamber technologies on jet engine design, with a focus on innovations such as annular combustors, rich-burn, quick-quench, lean-burn (RQL) combustors, and pulse and rotating detonation combustors (PDCs and RDCs). It provides an overview of their principles, benefits, and operational challenges. The study also highlights advanced cooling techniques, including effusion and film cooling, as well as thermal barrier coatings that minimize thermal and mechanical stress, thereby enhancing durability and reliability. Innovations in fuel injection systems are examined for their precision and ability to maintain combustion stability at high altitudes. A comparison of these combustion chamber technologies, including annular, RQL, and detonation-based combustors, reveals how they enhance jet engine performance, reduce emissions (e.g., NOx, CO, unburned hydrocarbons, and soot, depending on the technology), and decrease fuel consumption. Key challenges include managing thermal gradients and ensuring performance during transient operations. Annular combustors enhance efficiency with a compact design suitable for both commercial and military aviation, while RQL combustors excel in NOx emission control through precise air–fuel mixture management. Despite obstacles in stabilizing detonation waves and ensuring turbine compatibility, these technologies present promising opportunities for substantial reduction in fuel consumption and emissions. Although newly developed cooling techniques effectively address thermal issues, ongoing research is essential for further advancements. Future efforts are expected to focus on hybrid combustor designs that leverage the strengths of various technologies, integrating sustainable aviation fuels (SAFs) and hydrogen while utilizing artificial intelligence (AI) for optimization. This review offers valuable insights into the evolution of jet engine combustion chambers, highlighting pathways for enhanced efficiency and reduced emissions.