スプリンクラーヘッドに関する研究 (第4報)

多孔形ヘッドの試作とその実験結果について

抄録

1. A new type of the sprinkler head with many orifices was manufactured for trial to irrigate much water in a short time, reducing evaporation loss of water.
2. Basing on the results of both fundamental experiments and calculation, the orifice diameter, inclination angle of nozzles, and number of orifices in the head was determined to ensure an uniform distribution of water over the sprinkling area.
3. The characteristics of the head observed in the experiments were as follows:
(a) The head of this type is effective to distribute water as uniformly as that of the revolving type, if the orifice diameter, inclination angle of nozzles and number of orifices in the head are moderately combined.
(b) An excessive increase of the rate of water application from the head, depending on its construction, makes it more desirable to employ it as a movable head than as a stationary one.
(c) The lengths of ricer and cylindrical part of the nozzle have no effect on the distribution of water.
(d) Water pressure more than 30lbs/in² will bring a satisfactory result, but the pressure lower than 15lbs/in² results in a narrow and uneven distribution of water.