Studies on the Pumping Performance of Power Sprayer (III)

Variations of Pressure and General properties

Abstract

It was the purpose of this study to find out the pressure variations, the torque and the general properties of the power sprayer.
The pressure in the cylinders, air chamber, discharge port, suction port and the torque on crank shaft were measured. In order to calculate the non-dimensional properties, the discharge flow and the over flow were measured.
The pressure and torque variations per one revolution were found from the experimental results. The non-dimensional properties were expressed as a function of K (K: non-dimensional value of discharge pressure).
The following resnlts were obtained.
1. The pressure variations were shown in Fig 3. At the suction and discharge stroke, the fluctuations of the cylinder pressure, the air chamber pressure and the discharge pressure were small.
2. In the power sprayer with no air chamber, the pressure fluctuations in cylinders at the discharge stroke were influenced by the fluctuation of discharge pressure (Fig 5).
3. On the fluctuation of torque, they have 6 peaks per one revolution. As the experimental values included the friction loss, they closely correspond to those calculated by the equation 2 and 5 (Fig 7 and 8).
4. The non-dimensional properties are shown in Fig 10, in which the difference by rotational speed of the power sprayer is found.