标准名称：	轮式工程机械车轮用型钢 技术条件
中标分类：	工程建设 >> 施工机械设备 >> 建筑工程施工机械
替代情况：	被JB/T 7154-2007替代
发布部门：	天津工程机械研究所
发布日期：	1993-11-21
实施日期：	1994-03-01
首发日期：	1900-01-01
作废日期：	2008-02-01
归口单位：	天津工程机械研究所
出版社：	机械工业出版社
出版日期：	2004-04-23
页数：	6 页
批文号：	机械科[1993]629号

本标准规定了轮式工程机械车轮用型钢的型式与尺寸、技术要求、试验方法、检验规则和标志、包装、运输及贮存等。 本标准适用于轮式工程机械车轮用型钢。

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Product Code:SAE AIR1168/11
Title:Spacecraft Boost and Entry Heat Transfer
Issuing Committee:Ac-9 Aircraft Environmental Systems Committee
Scope:The prediction of vehicle temperatures during ascent through the earth驴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.