When designing a multistage centrifugal pump, a number of factors must be taken into account. Among these are the fluctuating flow rates during start-up and the transient effect of the pump's characteristics in the open-state transient state.
Multistage centrifugal pumps and slurry pumps are designed for irrigation and water pressure boosting applications. They can handle pressure reductions of 1 m and are therefore ideal for borehole pumps. The design of a multistage pump consists of a main rotor with six blades for diffusers. This enables the pump to generate higher pressures with each stage.
The core components of a multistage pump are the impeller, the diffuser, the rotor system, and the pump casing. These components can be modeled by using ANSYS Fluent 18.2. A three-dimensional Reynolds time-averaged N-S equation was used to study the internal overflow interface of the centrifugal pump.
The first critical speed of the rotor system is 5270.9 rpm. Its maximum amplitude is 0.033 mm/s. Compared with the rated shaft frequency of 2980 rpm, the first critical speed has a higher amplitude. However, it is not a large difference.
At the rated flow rate, the simulated efficiency was about 1.2 Qd. The simulated efficiency was calculated by using a combination of hydraulic efficiency and turbulence models.
Multistage centrifugal pumps have fascinating transient properties. These include periodic unsteady flow, dynamic interference, and static interference. This paper explores the effect of transients on the open-state transient state and a multistage pump. The purpose of this research is to provide a reference for nuclear power plant safety design.
We used numerical simulation to assess the effect of transients on the open-state flow. Our findings indicate that the flow head hump increases during start-up, but decreases as impeller speed increases. In the open-valve transient, a significant pulsation diffusion loss occurs. Nonetheless, the same distribution exists in each flow channel. Not only does the speed change, but so does the efficiency.
Likewise, the transient effect on the flow through a closed valve is not as pronounced. For the most part, the flow is laminar, but at the impeller outlet, it becomes highly turbulent. In addition to the typical flow characteristics, the internal flow field possesses a process of energy transfer. In particular, an accessory bacteriochlorophyll anion serves as a transitory intermediate during the electron transfer process.
Multistage centrifugal pumps are a type of pump that consists of a structured grid of impellers at various levels of the flow passage. They are designed to improve the efficiency and noise reduction of the design. In this study, the flow passage parts of a multistage centrifugal pump were studied in detail to determine the vibration characteristics.
Flow rate, pressure fluctuation, and the number of stages have been investigated for a cantilever multistage centrifugal pump. Vibration amplitudes are shown to be relatively large under extreme conditions. However, the effects of these variables are relatively small in the low flow conditions.
The dominant frequency for a multistage centrifugal pump can be determined by the blade passing frequency (BPF) and shaft frequency. Under different flow rates and operation conditions, the two frequencies are almost identical. Nevertheless, the amplitude of the dominant frequency is higher in the first stage and decreases as the flow rate increases.
Typical multistage centrifugal pump designs include radial guide vanes, suction chamber, pump casing, and diffuser vanes. It also includes open-valve control, which is the process that allows the motor to maintain the rated speed when linear speed changes occur.
A multistage centrifugal pump has a number of components. These include the impeller, inlet and outlet pipes, and diffuser vanes. All of these components have different properties that affect the pump performance. In this study, a cantilever multistage centrifugal pump was selected as a research model. This pump was used to evaluate vibration patterns under different flow conditions.
Flow rate is an important factor affecting the maximum vibration speed. It also has a significant impact on the flow change. The vibration characteristics were mainly concentrated in the low frequency area. However, certain peaks appeared in 400 to 500 Hz.
The first stage of the pump body showed a dominant frequency of four times the blade frequency. However, the amplitude decreased with increasing flow rate.
In the second and third stages, the dominant frequency was two times the blade frequency. The amplitude at these stages was slightly smaller than that of the first stage. Although the amplitude was lower than that of the first stage under the design flow rate, it was much higher in extreme flow conditions.
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