An Experimental Investigation of Combustion Pressure Oscillations in Solid Fuel Ramjets.
Abstract
An experimental investigation of the mechanisms involved in combustion pressure oscillations in solid fuel ramjets was conducted. Dynamic pressure measurements of the combustion chamber and air inlet were recorded, while a series of tests using Plexiglas as a fuel were performed. Combustion chamber geometric changes were systematically made in order to help isolate the causal mechanisms. The air inlet system resonant frequency coupling with reattachment zone flow was found to be the major source of pressure oscillations while bypass air injection was the major source of disturbance to the upstream reattachment region of flow. The combustion efficiency of a vitiated air heater was also evaluated using a gas chromatograph to measure unburned fuel in the exhaust. Negligible unburned gaseous fuel existed for all fuel-air ratios and temperatures. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1984
- Accession Number
- ADA144870
Entities
People
- T. M. Parafiorito
Organizations
- Naval Postgraduate School