IEC 62034-2012 蓄电池供电应急灯的自动试验系统

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标准名称：	刮板输送机紧固件 棱头螺栓A型
中标分类：	机械 >> 通用零部件 >> 紧固件
发布部门：	中华人民共和国煤炭工业部
发布日期：	1988-04-13
实施日期：	1988-08-01
首发日期：	1900-01-01
作废日期：	1900-01-01
提出单位：	中华人民共和国煤炭工业部技术发展司
归口单位：	煤炭科学研究院太原分院
起草单位：	哈尔滨煤矿机械研究所
起草人：	丛培建、贾德林
出版社：	中国煤炭工业出版社
出版日期：	1988-08-01
页数：	4页

本标准适用于煤矿井下刮板输送机采用的棱头螺栓A型(以下简称螺栓)。

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Product Code:SAE AIR1191
Title:Performance of Low Pressure Ratio Ejectors for Engine Nacelle Cooling
Issuing Committee:S-12 Helicopter Powerplant Committee
Scope:Method: A general method for the preliminary design of a siingle, straight-sided, low subsonic ejector is presented. The method is based on the information presented in References 1, 2, 3, and 4, and utilizes analytical and empirical data for the sizing of the ejector mixing duct diameter and flow length. The low subsonic restriction applies because compressibility effects were not included in the development of the basic design equations. The equations are restricted to applications where Mach numbers within the ejector primary or secondary flow paths are equal to or less than 0.3.Procedure: A recommended step-by-step procedure is shown.Equations: The equations used in the procedure, as well as their derivations, are given.Sample Calculation: A sample calculation is presented to isllustrate the use of the basic method.