This report describes an investigation of the performance of air-augmented waterjet thrusters. The investigation is divided into two parts. Part 1 describes a study of reduce heat transfer between the air and water and, thus, increase the thrust. This study is done analytically by solving the appropriate, governing equations. The results indicate that the approach is very worth-while since thrust can be increased ten percent as compared to air-augmentation with small bubbles. Several practical systems are discussed for injecting large air bubbles. Part 2 is an experimental investigation of the thrust produced under a wind range of conditions. The results show that a thrust increase of more than 20 % can be achieved by air-augmentation. Further, the performance improves for larger thrust nozzles. (Author)
Performance of air-augmented waterjet thrusters
Leistung einer luftverstaerkten Wasserstrahl-Schubduese
US Government Reports ; 1-59
1976
59 Seiten
Report
Englisch
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