A Study on the Cavitation and Pressure Pulsation Characteristics in the Impeller of an LNG Submerged Pump

Wei, Li; Li, Shuo; Ji, Leilei; Zhao, Xiuli; Shi, Weidong; Agarwal, Ramesh K.; Awais, Muhammad; Yang, Yang

doi:10.3390/machines10010014

Cited by 15 publications

(5 citation statements)

References 25 publications

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“…LNG is a cryogenic liquid characterized by a low value of latent heat of vaporization, which means that a small amount of heat can lead to vaporization of LNG, pressure increase in the storage system and significant process losses. During vaporization, the change of aggregate state of the substance occurs and a two-phase flow is formed in the pipelines, which additionally leads to a decrease in the throughput capacity of pipelines, as well as disturbances in the operation of dynamic equipment [4]. For example, according to [5], when designing systems with cryogenic centrifugal pumps, the formation of two-phase flow, which can lead to cavitation of the pump, should be avoided.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of cryogenic pipelines insulation selection at small scale liquefied natural gas production and consumption facilities

Bezdenezhnykh,

Beznosov

2024

E3S Web Conf.

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The article analyzes the typical design and materials of thermal insulation of cryogenic pipelines, compares them on the basis of thermal conductivity, and considers the key differences in the regulatory and technical documents of the Russian Federation, the People's Republic of China and the European Union, which should be taken into account in the design of thermal insulation of pipelines at low-tonnage LNG facilities. A number of regulatory requirements in the Russian Federation restrict the use of commonly used materials such as polyisocyanurate and pouleorethane foam without the development of a safety case or the use of additional compensating measures. Thermal insulation structures based on aerogels or foam glass are acceptable, but have a number of shortcomings.

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Section: Introductionmentioning

confidence: 99%

Peculiarities of cryogenic pipelines insulation selection at small scale liquefied natural gas production and consumption facilities

Bezdenezhnykh,

Beznosov

2024

E3S Web Conf.

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“…Pressure pulsation is one of the main causes of vibration and noise in pump devices, and some scholars have carried out studies on the internal pressure pulsation characteristics of pump devices of different structural forms (Chu et al, 1995;Li et al, 2018;Ji et al, 2020;Yang et al, 2021a). Li et al (2021) examine the cavitation performance of an LNG submerged pump and the pressure pulsation characteristics during cavitation excitation using CFD analytical technologies. Jin et al (2019) present an investigation of external flow characteristics and pressure fluctuation of a submersible tubular pumping system by using a combination of numerical simulation and experimental methods.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the internal flow and pressure pulsation characteristics of a submersible tubular electric pump device

Ding²,

Liu³

et al. 2023

Front. Energy Res.

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In order to clarify the non-constant flow characteristics of the impeller and bulb body of the submersible tubular electric pump device, the entire flow rate conduit of the pump device is numerically calculated using the numerical simulation method, focusing on the analysis of the non-constant flow field characteristics of the guide vane body and bulb body and the time–frequency variation law of the pressure pulsation, and the results of the physical model testing confirm the validity of the numerical simulation. The findings demonstrate that the impeller of a submersible tubular electric pump is mostly responsible for the impeller’s inlet pressure pulsation, and the number of impeller blades to the number of peaks and valleys is consistent. Under the high flow rate condition of 1.2 Qd, the pressure fluctuation in the impeller inlet, between the impeller and the guide vane is small, and the main frequency is located at three times the rotational frequency, and the pressure pulsation at the outlet of the guide vane body has no obvious pattern and small amplitude. As the flow rate increases, the peak value of pressure pulsation at each monitoring point in the characteristic section of the pump device gradually decreases. The pressure pulsation peak value varies widely, ranging from 0.058 to 0.15, at each monitoring location of the impeller inlet. The peak value of pressure pulsation at each monitoring point of the impeller outlet fluctuates less due to the change of flow rate. The size and scale of the omega vortex structure in the guide vane body at different moments of the same cycle is small, and the number of vortex structures from the guide vane body inlet to the outlet direction shows a gradual increase in the trend; with a rise in flow rate, there is a tendency for the velocity and deflection angle of the guide vane body outlet and bulb body outlet surface to decrease.

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“…The pressure pulsation of various pump devices, including centrifugal pumps and LNG (Liquefied Natural Gas)submersible pumps, was also explored by several other academics using cuttingedge technologies like Welch and Grid slip, and improved the theory of pressure pulsation, which has contributed to solving the problem of reducing pressure pulsation and the vibration of the device caused by it, and further ensured the safety of pratical engineering. [15][16][17] Regarding the hydraulic performance of the pump devices, the pipe's hydraulic performance has a direct impact on its overall hydraulic efficiency and operational stability. The flow will enter the elbow pipe in a spiral pattern due to the impeller's rotational effort and the guide vane's ability to recover kinetic energy.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the internal biased flow mechanism of the siphon outlet pipe under the action of axial flow pump

Yang,

Sun,

Jin

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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One of the often employed flow structures in vertical pumping stations is the siphon outlet pipe. It has a complicated geometric structure and internal flow field, which directly affects how effectively, safely, and steadily pumping stations operate. The entire flow conduit of the vertical axial flow pump device was adopted as the study object in order to elucidate the mechanism of the internal biased flow of the siphon outlet pipe caused by the axial flow pump under different flow conditions, and the three-dimensional unsteady flow field of the vertical axial flow pump device was numerically solved using the numerical simulation technique. Physical model tests were used to confirm the results of the numerical simulation. The findings demonstrate that there is a horizontal bias in the flow of the inlet surface and outlet surface of the elbow pipe of the siphon outlet pipe, and that when the flow rate rises, the degree of the horizontal bias in the flow gradually diminishes, and the ratio of biased flow gradually decreases. The flow in hump segment presents up-and-down flow, and when the flow rate increases, the ratios of biased flow first rises before falling. The major causes of the production of biased flow in the outlet pipe are residual velocity circulation at the guide vane's outlet, wall constraint at the elbow pipe, and flow inertia; Under various flow conditions, the morphologies of the vortex structures in the outlet pipe vary; the characteristics of the energy conversion of each part of the pump device are disclosed, with the inlet pipe having the lowest proportion of energy conversion. Under the optimal flow condition, the elbow-inlet pipe's proportion of energy conversion is only around 1.04%, and the proportions of the guide vane, 60° elbow pipe, and siphon outlet pipe's energy conversion are significant and fluctuate with time. The proportion of energy conversion in the elbow-inlet pipe and siphon outlet pipe steadily increases as flow rate rises, but the proportion in the guide vane and 60° elbow pipe drops initially before increasing.

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A Study on the Cavitation and Pressure Pulsation Characteristics in the Impeller of an LNG Submerged Pump

Cited by 15 publications

References 25 publications

Peculiarities of cryogenic pipelines insulation selection at small scale liquefied natural gas production and consumption facilities

Peculiarities of cryogenic pipelines insulation selection at small scale liquefied natural gas production and consumption facilities

Numerical analysis of the internal flow and pressure pulsation characteristics of a submersible tubular electric pump device

Numerical analysis of the internal biased flow mechanism of the siphon outlet pipe under the action of axial flow pump

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