Patent ID: 7713020
Filing Date: 2010-05-11
Classification: F03B,F03D,F05B,Y02E,Y10S

Abstract:
1. A diffuser for use in apparatus for extracting energy from a flow of liquid, said diffuser comprising a flow passage having an inlet and an outlet and a side wall or walls between said inlet and said outlet, said flow passage having a decreasing cross sectional area inwardly from the inlet to a constricted region between the inlet and the outlet and having an increasing cross sectional area rearwardly and away from the constricted region towards the outlet, said side wall or walls being defined by a plurality of members of an aerofoil cross-section arranged in series between said inlet and said outlet such that other than at the inlet and outlet, the trailing portion of one aerofoil member is adjacent the leading portion of the immediately adjacent trailing aerofoil member and defines a gap or slot therewith whereby a plurality of gaps or slots are provided serially from said inlet to said outlet through which fluid from outside of said diffuser can pass into said flow passage.