Acoustic Waves in Baffled Liquid-Propellant Rocket Emgines
Abstract
A linear and nonlinear acoustic wave analysis has been developed for baffled combustion chambers. Results suggest three important effects of baffles on transverse modes of combustion instability. First, transverse waves can be longitudinalized inside baffle compartments. This may decouple combustion response from oscillatory motions if the processes near the injector face are sensitive to transverse variations in pressure. Second, severe restriction of the transverse component of acoustic velocity fluctuations is observed in baffle compartments. This may be key in stabilizing systems with velocity-sensitive combustion. Third, the frequency of oscillation is decreased with the addition of baffles, in agreement with experiments. One potentially destabilizing effect of baffles is the observed pressure concentration at the injector face. Pressure sensitive processes in this region may enhance instability. Limit cycles were observed for both two- and three-dimensional baffled chambers. Their most remarkable characteristic is high frequency modulation of the limit cycle amplitude.... Combustion instability; Liquid rocket propulsion; Acoustic waves.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1993
- Accession Number
- ADA267260
Entities
People
- J. M. Wicker
- M. W. Yoon
- Vigor Yang
Organizations
- Pennsylvania State University