Liquid Stability Mechanisms Program.
Abstract
The processes participating in liquid rocket engine high frequency combustion instability are not well understood. The Liquid Stability Mechanisms (LSM) program investigated the potential, fundamental mechanisms of vaporization and secondary atomization. Using state-of-the-art diagnostic techniques, the vaporization rate of a droplet exposed to an acoustic perturbation was measured; the results indicate that the transient vaporization response is greatly affected by a pressure pulse. A multiphase, continuous injection droplet vaporization model was used to analytically predict droplet vaporization under oscillatory conditions. These results also indicate that the vaporization response is strongly affected by pressure waves and is capable of supplying enough energy to support an ordered oscillation in the combustion chamber. Shadowgraphic cinematography was employed to study the secondary atomization process in a newly built, high pressure shock tube. Preliminary results were obtained of droplet breakup under Reynolds number and liquid to gas density ratio conditions that match those seen under supercritical conditions were also obtained: these data show a process that differs from typical results at low pressure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1995
- Accession Number
- ADA299059
Entities
People
- Eric L. Peterson
- George B. Cox Jr.
- Tyler T. Evans
Organizations
- Pratt & Whitney