High frequency combustion instability in liquid rocket engines: Review

High-frequency combustion instability remains a key challenge in the development of high-performance liquid rocket engines. The physical processes involved have significant characteristics such as cross scale, nonlinearity, and multi-field coupling. Improving the overall understanding of such problems is helpful for systematic research work. This article briefly describes the main characteristics, key physical mechanisms, and research ideas of high-frequency combustion instability in liquid rocket engines, focusing on the research progress in sub-process response mechanisms both domestically and internationally in recent decades. It points out the important significance of studying response mechanisms for different engine combustion rate control processes, summarizes the progress made by different analysis methods, challenges faced, and subsequent development directions, providing reference for engineering management of such issues.