Thrust Characteristics and Nozzle Role of Water Jet Propulsion
-
- Ni Yongyan
- School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology
-
- Liu Weimin
- School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology
-
- Shen Zhanhao
- National Research Centre of Pumps, Jiangsu University
-
- Pan Xiwei
- National Research Centre of Pumps, Jiangsu University
説明
Surface pressure integration and momentum method were respectively performed to evaluate the impeller thrust and the system thrust of a contra-rotating axial flow water jet propulsion, and an interesting phenomenon so-called thrust paradox was revealed. To explain the paradox, the impeller thrust and the system thrust were physically and theoretically analyzed, the results show that the impeller thrust is head involved and is determined by the hydraulic parameters upstream and downstream the impeller, while the momentum method depicted by a classic equation is valid simply under the best efficiency point. Consequently, the role of a water jet propulsion nozzle was deduced that the nozzle is mainly to limit the flow rate that crosses the impeller and to assure the system working under the best efficiency condition apart from its ability to produce momentum difference. Related mathematical formula expressed the nozzle diameter is the dominant variable used to calculate the working condition of the water jet propulsion. Therefore the nozzle diameter can be steadily estimated by the former expression. The system thrust scaling characteristics under various speeds were displayed lastly.
収録刊行物
-
- International Journal of Fluid Machinery and Systems
-
International Journal of Fluid Machinery and Systems 10 (1), 47-53, 2017
ターボ機械協会、韓国流体機械学会、中国工程熱物理学会、国際水理学会
- Tweet
詳細情報 詳細情報について
-
- CRID
- 1390001205297490688
-
- NII論文ID
- 130005395313
-
- ISSN
- 18829554
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- Crossref
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可
