ISO 23453:2022 船舶および海洋技術 — 固定ピッチ船舶用プロペラ用フィン付きハブ キャップの設計および製造に関するガイドライン | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, 2 (see www.iso.org/directives ).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents ).

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html .

This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee SC 8, Ship design.

Introduction

A hub cap with fins is an energy-saving device installed behind a propeller instead of a propeller hub cap. It rotates together with the propeller to increase the propulsion efficiency of the ship by decreasing the energy losses caused by hub vortex. To save energy and reduce underwater noise, propeller hub caps with fins are installed on a wide variety of ships.

1 Scope

This document provides general guidelines for design and manufacture of a hub vortex energy-saving device for a fixed-pitch marine propeller. This document can also apply to the design and manufacture of hub vortex energy-saving device for other types of marine propellers.

According to the specific geometrical shape of the propeller and other specifications, it is suggested that hub cap with fins is used in merchant ships.

2 Normative references

There are no normative references in this document.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

3.3

circumferential phase angle

ψ

angle between propeller generator line and hub cap with fins generator line

Note 1 to entry: Figure 1 shows the circumferential phase angle.

Figure 1—Sketch of a propeller and a HCWF geometry

a) Side view	b) Back view

Key

1	propeller disc
2	axial distance between propeller disc and HCWF disc, L
3	HCWF disc
4	generator line of HCWF fin
5	circumferential phase angle, ψ
6	generator line of propeller blade
7	diameter of HCWF, DF
8	diameter of propeller, D

Bibliography