An Optical Study of Processes in Hydrogen Flame in a Tube
Abstract
In the present study, to investigate into hydrogen combustion in an air flow, we registered the radiation intensity due to electron-excited OH radicals in the wavelength range 280-340 nm. We examined correlation- and autocorrelation spectra for the local pulsations of glow intensity and acoustic pulsations produced by the flame. The experimental scheme is shown in Fig. I. Gaseous hydrogen was fed into injector, which was positioned in a vertically installed transparent quartz tube. The diameter of the injector hole was d=1 mm. The rate of the hydrogen flow was determined from the pressure drop across a hydroresistance included into the hydrogen supply system. To monitor the emission intensity due to OH radicals, we used an optical system that contained a narrowband optical filter, a quartz lens, and a photomultiplier FEU-39A. The transmission factor of the quartz tube in the UV spectral region was no less than 90%. The flame noise was measured by a piezoceramic sensing element I4310 that was located near the lower end of the quartz tube. Between the tube and the optical system, an opaque screen was installed with a horizontal slot of 3-mm height. The screen could exert displacements along the tube on a traversing gear with a rheochord, which enabled us to scan the emission intensity along the tube length. The output electric signals generated by the optical system, acoustic emission detector, rheochord, and hydrogen flow meter were simultaneously recorded by a multi-channeled magnetograph (NO 67) with a channel bandwidth of 20 kHz. The spectral and correlative analyses were carried out on a personal computer using the recorded data.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2002
- Accession Number
- ADA409119
Entities
People
- A. V. Potapkin
- S. G. Mironov
Organizations
- Russian Academy of Sciences