Pressure exchanging compressor-expander and methods of use

摘要: A novel pressure-exchange compressor-expander is disclosed whereby a high energy primary fluid compresses lower secondary through direct fluid-fluid momentum exchange. The utilizes non-steady flow principles and supersonic to obtain an ejector-compressor which can attain adiabatic efficiencies while having simplicity of construction, small size weight, the low manufacturing cost. This disclosure includes fuel-cell pressurization system humidity control utilizing compressor-expander. turbo-charger for internal combustion engines incorporating exhaust gas recirculation capabilities. Further, air-cycle heat pump suitable aircraft applications