冷却器の装備法(第一報)

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1. It is very important (for the aeroplane designer) to know the characteristics of the radiator system. The analysis for this problem has been treated and the theoretical calculations have been compared with the experimental results. 2. Theory: -In fig.1, p, F, w and c is pressure, sectional area, velocity and coefficient of resistance of the air flow respectively. The equations for the flow of the cooling air are as follows: -[numerical formula]…… (3.1) [numerical formula]…… (3.2) [numerical formula]…… (3.3) [numerical formula]…… (3.4) [numerical formula]…… (3.5) Putting [numerical formula], then the equation (3.3) becomes, [numerical formula]…… (3.3)' where [numerical formula] From equation (3.1) 〜 (3.6), the value of w_2/w_0 will be [numerical formula]… (3.7) where b_1=F_2/F_1, b_4=F_2/F_4 and [numerical formula]. The drag force of the radiator system X_r is [numerical formula] The coefficient of the resistance of the radiater system is [numerical formula]…… (3.10) 3. Comparison of the theoretical calculation with the experimental results. Assume c'=0, then [numerical formula] In the Figs.2〜5, the dotted and full lines show the calculated and the observed values respectively. It is shown by those curves that the calculated values agree fairly well with the experimental results, and that the theoretical formulae are applicable.
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