| Abstrakt: |
The author has obtained data on gasdynamic and heat-transfer characteristics of nonstationary flow of a gas in the outlet duct of the centrifugal compressor of a turbocharger for supercharging piston engines. It has been shown that an equalizing grid installed in the outlet duct of the turbocharger centrifugal compressor reduces 2 to 3 times the amplitude of pulsations of the gas-flow velocity in this duct, decreases its turbulence by 30%, and enhances heat transfer in the duct by 13–25% compared to the basic duct without a grid. It has been established that cutting grooves in the indicated channel leads to an increase of 9–12% in the gas turbulence in it; the local coefficient of heat transfer in this duct increases 35% compared to the basic duct. Based on the numerical modeling of processes occurring in the piston-engine′s turbocharger, the authors has demonstrated a positive effect from the equalizing grid being installed in the outlet duct to the turbocharger centrifugal compressor and from the grooves being cut on its walls, which consists in increasing the power of the engine by 2% and its efficiency, by 0.25%. [ABSTRACT FROM AUTHOR] |
Full text from SpringerLink