Day 1 Tue, September 11, 2012最新文献

Influence of Gap Flow on the Cavitating Response of a Rectangular Hydrofoil 间隙流对矩形水翼空化响应的影响

Day 1 Tue, September 11, 2012 Pub Date : 2012-09-11 DOI: 10.5957/pss-2012-006

C. Harwood, A. Ducoin, Y. L. Young

{"title":"Influence of Gap Flow on the Cavitating Response of a Rectangular Hydrofoil","authors":"C. Harwood, A. Ducoin, Y. L. Young","doi":"10.5957/pss-2012-006","DOIUrl":"https://doi.org/10.5957/pss-2012-006","url":null,"abstract":"A commercial URANS solver is used to analyze the cavitating flow field around a rectangular, cantilevered hydrofoil with a small gap between the free end and the wall of a cavitation tunnel. A transport-equation based cavitation model is used along with an artificial compressibility correction for the turbulent eddy viscosity. The objective is to improve the understanding of the unsteady interactions between the 3-D gap flow, sheet-cloud cavitation, gap cavitation, tip vortices, and their dependence on the cavitation index. It is found that the numerically-predicted wetted pressure distributions, cavitation patterns, and load coefficients agree well with experimental measurements and observations. The results suggest that the presence of cavitation significantly modifies the boundary layer flow near the tip and the tunnel wall, disrupts the formation of the tip-leakage vortex, and enhances other secondary flows. Although the numerical model was able to simulate the general dynamics of sheet and gap cavitation, a more refined mesh and higher fidelity turbulence models (e.g. DES or LES) are needed to resolve the fine vortex structures in the tip, tip vortex cavitation, and the highly transient features of 3-D cloud cavitation.","PeriodicalId":213253,"journal":{"name":"Day 1 Tue, September 11, 2012","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115751168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

PTFE Partial Arc Bearing for Large Water-lubricated Tail-shafts 用于大型水润滑尾轴的聚四氟乙烯部分弧轴承

Day 1 Tue, September 11, 2012 Pub Date : 2012-09-11 DOI: 10.5957/pss-2012-003

H. Sada, Tomohiro Tanaka, F. Kikkawa, Yoshimasa Kachu, David W. Hawkins

引用次数: 0

Presentation of Propulsion Machinery Case Stories from DNV Maritime Technical Advisory 介绍来自DNV海事技术咨询公司的推进机械案例

Day 1 Tue, September 11, 2012 Pub Date : 2012-09-11 DOI: 10.5957/pss-2012-008

J. H. Andersen

引用次数: 0

A Hybrid Viscous/Potential Flow Method for the Prediction of the Wetted and Cavitating Performance of Ducted Propellers 一种预测导管螺旋桨湿化和空化性能的粘性/势流混合方法

Day 1 Tue, September 11, 2012 Pub Date : 2012-09-11 DOI: 10.5957/pss-2012-005

S. Kinnas, C. Jeon, Ye Tian

引用次数: 3

Non-Contacting Water Activated Bulkhead Seals: Improved Safety and Reduced Costs 非接触式水激活舱壁密封:提高安全性，降低成本

Day 1 Tue, September 11, 2012 Pub Date : 2012-09-11 DOI: 10.5957/pss-2012-011

C. Ludlow, Adele Cutler, S. Klepper, M. V. van Schoor

引用次数: 0

A Panel Method for the Hydrodynamic PerformancePrediction of a Water-jet and an Inducer 一种用于水射流和诱导器水动力性能预测的面板法

Day 1 Tue, September 11, 2012 Pub Date : 2012-09-11 DOI: 10.5957/pss-2012-004

S. Kinnas, Shu Chang, Alokraj Valsaraj

引用次数: 1

Iterative Design Process for Novel LCAC Composite Shaft 新型LCAC复合轴的迭代设计过程

Day 1 Tue, September 11, 2012 Pub Date : 2012-09-11 DOI: 10.5957/pss-2012-002

Steve Schoenholtz, Darcy Hornberger

{"title":"Iterative Design Process for Novel LCAC Composite Shaft","authors":"Steve Schoenholtz, Darcy Hornberger","doi":"10.5957/pss-2012-002","DOIUrl":"https://doi.org/10.5957/pss-2012-002","url":null,"abstract":"KaZaK Composites, a Plasan Company has designed, fabricated, and demonstrated a novel composite S1/S2 lift fan shaft assembly for the Navy’s Landing Craft Air Cushion (LCAC) vehicle. The shaft is a drop-in replacement for the legacy steel shaft assembly and provides the same performance with less than half the weight. A unique integral coupling design allows for angular misalignment and axial deflection while reducing weight, part count, and assembly time over legacy metal flex packs. Use of advanced carbon composite materials greatly reduces corrosion and its associated maintenance costs. The design is readily adaptable and scalable.\u0000 The focus of this paper is the iterative process of computer based analytical design, prototype manufacture, prototype testing, and failure investigation KaZaK developed to optimize the shaft structure and reduce fabrication costs. The resulting process is a robust, cost-effective method for developing follow-on shaft designs. Utilizing this process, KaZaK’s S1/S2 composite shaft prototype successfully completed an application based, pre-qualification test program that included over-speed testing, static torque proof loading, and fatigue testing in a laboratory environment.","PeriodicalId":213253,"journal":{"name":"Day 1 Tue, September 11, 2012","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126396443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0