A Study of Fluid-Dynamic Pressure Fields on Compressor Reed Valves.
Abstract
Reed values are spring-metal plates which commonly serve as intake and exhaust valves in compressor units of refrigeration systems. This thesis reports on an analytic and experimental study of flow through reed-valve-like inlet geometries. In these inlet geometries, with reservoir pressures up to 2 1/4 times ambient, the flow passed through a hole in a base plate, stagnated, and turned 90 degrees by a disk centered over the hole, and directed radially outward between the base plate and the disk. Cover-plate-like geometries up to 3 times the diameter of the hole in the base plate, as well as modified base-plate geometries, were investigated. The analytic model used one-dimensional (radially symmetric) compressible flow relations to model the inlet geometries in an initial supersonic region which accounted for friction and possible separation. Shock matching techniques were then employed to locate a shock and predict the properties of the flow just behind the shock. Finally, subsonic, insentropic, compressible equations were used to model the flow from the shock to the exit. The analytic modelling was compared with the experimental results and found to satisfactorily explain the qualitative character of the flows, and to some degree the quantitative nature of the flows. The results of this study suggest that reed-valve inlet geometries should have relatively thin and high-lipped inlet configurations so as to minimize total pressure loss. Furthermore, the study indicates that the cover plate of a reed valve should barely cover the inlet to minimize the likelihood of any severe noise and vibration. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1986
- Accession Number
- ADA178584
Entities
People
- Clarence J. Coleman Jr
Organizations
- Air Force Institute of Technology