Enhancement of Oscillatory Flap Propulsors for Low Speed Flows in Water

摘要

In this report, I summarize some of my efforts in support of the DARPA Powerswim program. This report is broken down into several sections. I begin with a discussion of the kinematics of the Aquaon oscillating foil device (OFD). These kinematics are derived from digital image analysis of underwater video of combat swimmers using the OFD. Next, I derive the propulsive power requirements for divers with two gear configurations. From these results, I am able to derive OFD efficiency requirements and diver swimming duration curves. Then, I discuss wing tip shapes and make suggestions for tip modifications. The next three sections discuss the role of the rear stabilizer wing and make suggestions for modifications that will allow for reduced drag and greater efficiency. This report concludes with the disclosure of an new, folding, more efficient OFD and high performance SCUBA flippers that could be a possible alternative to the OFD.