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

被引:41
作者
Rein, Keith D. [1 ]
Roy, Sukesh [1 ]
Sanders, Scott T. [2 ]
Caswell, Andrew W. [3 ]
Schauer, Frederick R. [3 ]
Gord, James R. [3 ]
机构
[1] Spectral Energies LLC, 5100 Springfield St,Suite 301, Dayton, OH 45431 USA
[2] Univ Wisconsin, 1500 Engn Dr, Madison, WI 53706 USA
[3] Air Force Res Lab, Dayton, OH 45433 USA
来源
APPLIED PHYSICS B-LASERS AND OPTICS | 2017年 / 123卷 / 03期
关键词
DIODE-LASER SENSOR; ABSORPTION-SPECTROSCOPY; PARAMETERS; H2O;
D O I
10.1007/s00340-017-6647-5
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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.
引用
收藏
页数:9
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