航空用冷却器の周りの流れと冷却器覆ひ
1936 年 1936 巻 58 号 p. 189-200
詳細
1936 年 1936 巻 58 号 p. 189-200
As the drag horsepower of radiator is nearly proportional to the cubic power of air speed, the speed-up of modern aeroplane makes it desirable to save the resistance. Recently Assistant Prof. Fukatsu, Member of the Aeronautical Research Institute, investigated the nature of flow around radiators by photographing the aluminium-powder scattered on the water. From the experimental results he concluded that the aerofoil-cowlings would be very effective for decreasing the resistance due to vortices produced along the side and that the interference of side-walls or body-walls upon airflow at the inlet of radiators would be considerably reduced by taking some clearance between radiators and side-walls as illustrated in Figs. 1, 2and17, 18.
According to the measurements of drag of actual radiators with the wind-tunnel, the aerofoil-type cowlings are very much effective upon the reduction of the drag as shown in Fig. 5 and the experiments for cooling power reveal that the use of cowlings as no serious influence on the heat dissipating capacity of radiators (Fig 11).
From Figs. 19 and 22 it will be seen that only a small amount of drag is diminished by the side clearance between walls and radiato s and that there is hardly any effect upon cooling power.
