【英文标准名称】:Safetyofhouseholdandsimilarelectricalappliances.Part2-18:Guideforpreparingsafetyrequirementsforbattery-poweredmotor-operatedappliancesandtheirchargingandbatteryassemblies
【原文标准名称】:家用和类似电器的安全.第2部分第18节:电池供电的电动器具及其充电和电池组安全要求的制订导则
【标准号】:IEC60335-2-18-1984
【标准状态】:作废
【国别】:国际
【发布日期】:1984
【实施或试行日期】:
【发布单位】:国际电工委员会(IEC)
【起草单位】:IEC/TC61
【标准类型】:()
【标准水平】:()
【中文主题词】:装载机;家用设备;机动家用设备;蓄电池充电器;指导手册;电池供电的电器;电池供电装置;电气工程;电池组件;安全要求;家用电器;电器
【英文主题词】:
【摘要】:
【中国标准分类号】:Y60;K82
【国际标准分类号】:1470
【页数】:35P;A4
【正文语种】:英语


Product Code:SAE AIR1168/11
Title:Spacecraft Boost and Entry Heat Transfer (STABILIZED Jul 2011)
Issuing Committee:Ac-9 Aircraft Environmental Systems Committee
Scope:The prediction of vehicle temperatures during ascent through the earth?s atmosphere requires an accurate knowledge of the aerodynamic heating rates occurring at the vehicle surface. Flight parameters required in heating calculations include the local airstream velocity, pressure, and temperature at the boundary layer edge for the vehicle location in question. In addition, thermodynamic and transport air properties are required at these conditions.Both laminar and turbulent boundary layers occur during the boost trajectory. Experience has shown that laminar and turbulent heating are of equivalent importance. Laminar heating predominates in importance in the stagnation areas, but the large afterbody surfaces are most strongly affected by turbulent heating. Once the local flow conditions and corresponding air properties have been obtained, the convective heating rate may be calculated for a particular wall temperature. This assumes that the boundary layer flow regime (that is, turbulent, laminar, or transitory) has also been established, so that a heating theory corresponding to the particular flow conditions may be selected.This section presents theoretical methods for computing boost vehicle surface aerodynamic heating rates. First, procedures are given for computing the local flow distributions around the vehicle. Second, methods are given for computing the convective heating rates, using the flow parameters found previously.