The interaction of liquid reacting droplets with the pulsating flow in a Rijke-tube combustor
- Inst. Nacional de Pesquisas Espaciais, Cachoeira Paulista, Sao Paulo (Brazil). Lab. Associado de Combustao e Propulsao
- Brigham Young Univ., Provo, UT (United States). Mechanical Engineering Dept.
This paper presents the results of a theoretical investigation on the characteristics of a reacting liquid droplet in the self-generated oscillatory flow of a Rijke-pulse combustor. The droplet motion equation, accounting for droplet evaporation due to combustion, was solved using a fourth-order, Runge-Kutta method. The model was applied to a Rijke-type, alcohol-fired combustor for which experimental data exist to be used as entrance parameters. The main conclusions derived from this study are (1) for a range of droplet initial velocity, pulsating flames of liquid fuels are shorter than the corresponding steady flames because of a reduction in lifetime of droplets with the same initial diameter in the pulsating flow, (2) for a range of droplet initial diameter, time-resolved heat generation rates from pulsating sprays exhibit a preferred frequency equal to twice the frequency of the pulsating flow, and (3) droplet initial diameter, droplet initial velocity, and location of the spray in the tube influence the excitation and maintenance of acoustic oscillations in a Rijke-type combustor based on evaluation of the Rayleigh integral over time and volume in the combustor. The theoretical results presented and discussed herein are supported by experimental observations.
- OSTI ID:
- 445609
- Journal Information:
- Combustion and Flame, Vol. 108, Issue 1-2; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Combustion characteristics of an ethanol spray-fired Rijke-tube combustor in an actively controlled acoustic field
The effect of acoustics on an ethanol spray flame in a propane-fired pulse combustor