At High Altitude
At High Altitude
复制标题
在高海拔地区
DOI：
10.1017/s0368393100107771
复制
发表时间：
1937
期刊：
影响因子：
--
通讯作者：
F. W. Lanchester
中科院分区：
文献类型：
--
作者：
F. W. Lanchester
在本文件(第二部分)中，发动机，以及更广泛的动力装置，是从它与海拔的关系来考虑的。讨论主要集中在增压问题上。在简要介绍了各种类型的增压机之后，作者在理想的基础上开始了讨论，在理想的基础上，增压机应该是100%、高效的，并且大气被视为绝热的，就像曾经被认为的那样。然后引入了“国际标准大气”作为修改条件，并在此基础上讨论了增压效率问题。作者根据绝热类型的定律处理这一问题，但采用了不同的指数，并表明这种处理的效率随海拔高度的变化而变化，约为60%至70%。在明确了增压影响温度的难点后，结合热力学图解，对压气机与发动机间的中间冷却问题进行了详细的讨论。然后对螺旋桨进行了讨论，并阐明了变桨距的情况。最后，讨论了表面冷却的问题，它既适用于发动机，也适用于中间冷却器。
In the present paper (Part II) the engine, and more broadly the power plant, is considered in its relation to altitude. The discussion hinges mainly on the question of supercharge. After a brief reference to the various types of supercharger the author opens the discussion on an ideal basis, in which the supercharger is supposed to be 100 per cent, efficient, and the atmosphere is treated as adiabatic, as was at one time supposed. Then the “International Standard Atmosphere” is introduced as modifying the conditions, and after that the question of supercharger efficiency is dealt with. The author treats this on the basis of a law of adiabatic type but with a different index, and shows that this treatment gives an efficiency varying from approximately 60 to 70 per cent, as a function of altitude. The difficulties connected with supercharge as affecting temperature, having been made clear, the subject of inter-cooling between compressor and engine is dealt with at length with the aid of thermodynamic diagrams. Then the propeller is discussed, and the case for variable pitch made clear. Finally, the subject of surface cooling is dealt with, applied both to the engine and to the inter-cooler.