Abstract
This study focuses on the influence of dimensionless geometry parameters on the performance and loss coefficient of the throat and diffuser of the water jet pump apparatus. A water jet pump system was designed for a total of nine experimental cases with three different projection ratios and three throat-aspect ratios . The volumetric and pressure ratios - performance parameters are measured at a constant motive pressure and under varying backpressure. The efficiencies of the water jet pump in each configuration were assessed and compared. It was found that increasing 2 or 3 times of projection ratio degrades efficiency about 2% to 5.5%, respectively. Higher projection ratio ( > 1) expands the water jet diameter, which clogs the secondary flow. Hence, the changes in > 3 may have a significant impact on efficiency degradation. Shorter may cause the loss of kinetic energy in the diffuser, while longer reduces momentum transfer on the secondary flow. Moreover, the changes in and influence friction loss coefficient in the throat and diffuser section, and it reduces with increasing of volumetric ratio. It can be concluded that the appropriate value of projection ratio and throat-aspect ratio plays a role in the kinetic energy dissipation. It is also responsible for the location friction process, at a different volumetric ratio. However, the experimental results denoted the best efficiency and loss coefficient was achieved at a low projection ratio ( = 1) and small throat-aspect ratios ( = 5). The best efficiency of the study was about 23.37%.
Highlights
A jet pump is one of the artificial lift equipment, which works by transferring momentum from the high-velocity primary flow to the secondary flow
The projection ratio is related to the momentum transfer and cavitation process, while the throat-aspect ratio is related to the mixing process and friction loss
It reveals that an increase in projection ratio (L∗x) and throat-aspect ratio (L∗t) tends to decrease Qs
Summary
A jet pump is one of the artificial lift equipment, which works by transferring momentum from the high-velocity primary flow to the secondary flow. It has been widely used in various distinct situations and industrial processes. A typical jet pump is mainly composed of a nozzle, a suction chamber, a throat pipe, and a diffuser (see Figure 1(a)). The main features of the jet pump are the absence of rotating parts, simple structure, reliability, durability, and relatively low cost [1]. A good design of jet pump should have 20% to 40% efficiency [2]. According to the efficiency range, the jet pump still faces the inefficiency problem. The phenomena can be analysed by measuring the wall pressure gradient or by capturing the phenomena
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