Measurements of gas temperatures at 100 kHz within the annulus of a rotating detonation engine

作者：Rein Keith D^*; Roy Sukesh; Sanders Scott T; Caswell Andrew W; Schauer Frederick R; Gord James R

来源：Applied Physics B: Lasers and Optics , 2017, 123(3): 88.

DOI：10.1007/s00340-017-6647-5

Cycle-resolved measurements of H2O temperatures and number densities taken within the detonation channel of a hydrogen-air rotating detonation engine (RDE) at a 100 kHz repetition rate using laser absorption spectroscopy are presented. The laser source used is an MEMS-tunable Vertical-Cavity Surface Emitting laser which scans from 1330 to 1360 nm. Optical access into and out of the RDE is achieved using a dual-core fiber optic. Light is pitched into the RDE through a sapphire window via a single-mode core, retroreflected off the mirror-polished inner radius of the RDE annulus, and collected with the multi-mode fiber core. The resulting absorption spectra are used to determine gas temperatures as a function of time. These measurements allow characterization of the transient-temperature response of the RDE.

• 出版日期2017-3