Types of Low Frequency Instabilities in Rotating Detonation Combustors

摘要

Rotating detonation combustors (RDC) offer a significant prospective increase in stagnation pressure across it owing to the presence of one or more rotating detonation waves spinning inside the combustor at the kilohertz regime. Naturally, considerable research impetus has been directed towards this technology in recent years to understand the driving mechanics to harness the associated potential of pressure gain combustion (PGC). One such area of focus has been the off-design operating modes of these devices which cause a myriad of instabilities. The current paper is focused towards the discussion of one such instability regime-low frequency instabilities (LFI)-in RDCs. We review three types of LFIs in RDCs based on prior findings, and propose mechanisms for the same.