BS 185-9-1970.pdf
《BS 185-9-1970.pdf》由会员分享,可在线阅读,更多相关《BS 185-9-1970.pdf(8页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD OBSOLESCENT MARCH 1987 BS 185-9:1970 Glossary of Aeronautical and astronautical terms Section 9: Propellers UDC 001.4:629.7.035.5 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 03:26:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 185-9:1970 This British Standard, having be
2、en approved by the Aerospace Industry Standards Committee, was published under the authority of the Executive Board of the Institution on 21 July 1970 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/1 Draft for comment 67/28249 ISBN 580 06451 4 A
3、 British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a
4、 front cover, an inside front cover, pages i and ii, pages 1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateC
5、omments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 03:26:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 185-9:1970 BSI 12-1999i Contents Page Section 9. Propellers1 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 03:26:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licen
6、sed Copy: sheffieldun sheffieldun, na, Fri Nov 24 03:26:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 185-9:1970 BSI 12-19991 (Notes on the arrangement and scope of the glossary are contained in the Foreword to Section 1.) Section 9. Propellers No.TermDefinition 9101airscrewAn assembly of aerofoi
7、ls, radially disposed, and designed to rotate in air with or without the application of power. The blade angle of each aerofoil usually varies along its length. balances 9102aerodynamic balance A propeller is in aerodynamic balance when the aerodynamic action on the blades results in no periodic for
8、ces or couples on the mounting. 9103dynamic balanceA propeller is in dynamic balance when the inertial forces due to its rotation result in no periodic forces or couples on the mounting. 9104static balanceA propeller is in static balance if, when concentrically mounted on a spindle supported by knif
9、e-edges, it will remain at rest in any position at any blade angle. 9105blade activity factorA non-dimensional function of the blade planform, used to express the capacity of a blade for absorbing power and defined by the formula: where R = blade tip radius. c = blade chord length at the radius r. 9
10、106blade angleThe angle, normally acute, between the pressure face of an element of a propeller and the plane of rotation. When the pressure face is curved, the blade angle is measured with reference to the chord. 9107blade sweepThe angular deviation of the locus of centroids of blade sections from
11、the radial line tangential thereto at the propeller axis, projected on to the plane of rotation. 9108leading sweepA blade sweep towards the leading edge. 9109trailing sweepA blade sweep towards the trailing edge. 9110blade tiltThe angular deviation of the locus of centroids of blade sections from th
12、e plane of rotation (backward tilt, forward tilt). 9111bossThe central portion of an integral propeller. (Cf. 9118.) 9112diameterThe diameter of the circle described by the tips of the blades. 9113disc areaThe area of the circle described by the tips of the blades. efficiencies 9114free air efficien
13、cyThe ratio of the free air thrust horsepower to the torque horsepower. 9115propulsive efficiencyThe ratio of the propulsive thrust horsepower to the torque horsepower. 9116shaft efficiencyThe ratio of the shaft thrust horsepower to the torque horsepower. 9117geometric pitch PITCH The distance which
14、 an element of a propeller would advance in one revolution when moving along a helix to which the line defining the blade angle of that element is tangential. NOTEThe geometric pitch of an element of a fixed-pitch propeller at the standard radius is usually referred to as the “pitch” of the particul
15、ar propeller, and is marked on it. 9118hub1. In an integral propeller. The detachable part on which the complete propeller is mounted on the propeller shaft. 2. In a propeller with detachable blades. The central portion to which the blade roots are attached. (Cf. 9111.) Licensed Copy: sheffieldun sh
16、effieldun, na, Fri Nov 24 03:26:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 185-9:1970 2 BSI 12-1999 No.TermDefinition 9119nose capA boss or hub fairing fitted co-axially and rotating with the propeller. It does not extend aft of the front of the blade roots. (Cf. 9148.) 9120out-of-alignmentHav
17、ing the blade sweep of one blade different from that of the other(s). 9121out-of-pitchHaving the blade angle of one blade different from that of any other at the same radius. 9122out-of-trackHaving the blade tilt of one blade different from that of the other(s). 9123pitch setting BLADE ANGLE SETTING
18、 The blade angle of adjustable or variable pitch propellers, measured at the standard radius. 9124braking pitchA pitch setting selected to give reverse thrust, either by windmilling at small positive pitch or by power operation at negative pitch. 9125feathering pitchA pitch setting selected to give
19、minimum speed of rotation and approximately minimum drag when the engine is stopped. 9126reverse pitchA negative pitch setting. power losses 9127induced power lossThe power expended in overcoming the drag of the blade elements contributing to thrust. 9128profile-drag power loss The power expended in
20、 overcoming the profile drag of the blade elements of a propeller. 9129pressure faceThe face of a propeller blade formed by the lower boundaries of the blade elements considered as aerofoil sections. 9130propellerA power-driven airscrew designed to produce thrust by its rotation in air. 9131adjustab
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS 185-9-1970 185 1970
链接地址:https://www.31doc.com/p-3730489.html