Study of Backward Bent Duct Buoy

Small wave power generators for navigation aids were used in practical in this 20 years, large wave power generator for island or land power supply is also developed in this 10 years. Backward Bent Duct Buoy (BBDB) is a new type buoy which has a Horizontal duct openning to backward. Single fuselage and twin fuselage BBDB were tested on a water tank, high electric generation, high energy conversion efficiency by wave,and low drag force by current were observed. Air pressure ratio values for both the backward facing and frontward facing are compared, and the reason of high output of BBDB (backward facing) is explained using water tank data. The floating wave power buoy can be dramatically improved by using the BBDB concept. This BBDB will be the most economical pneumatic wave energy conversion system for the island communities.