Study on the prediction method and the flow characteristics of gas-liquid two-phase flow patterns in the suction chamber

Shao, Changzheng; Bao, Ning; Wang, Sheng; Zhou, Jianfeng

doi:10.1108/hff-08-2021-0588

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…In general, the model of ventilated launch mainly includes an interior ballistic model, a turbulence model [17,18], and governing equations for gas-liquid flow [19,20].…”

Section: Governing Equationsmentioning

confidence: 99%

Effect of Starting Conditions on the Internal Flow Field and Interior Ballistic Performance of an Underwater Ventilated Launch

Zhang,

Hu,

2023

JMSE

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As one of the future main directions for underwater artillery, a ventilated launch can significantly reduce the huge water resistance during the underwater launching process. This paper aims to clarify the effect of starting conditions on the internal flow field and interior ballistic performance of an underwater ventilated launcher. Firstly, a three-dimensional unsteady model of gas–liquid two-phase flow is established. Following, an interior ballistic program of the underwater ventilated launch is developed. A coupling model between interior ballistic and gas–liquid interaction is then established, accounting for the projectile’s dynamic boundary effect and gas–liquid interaction. Subsequently, the simulation accuracy of the model is confirmed. Finally, the effect of parameter adjustments on the internal flow field and interior ballistic properties are contrasted and examined by altering the starting conditions. The results indicate that adjusting the gas injection pressure and projectile starting pressure can effectively regulate the drainage and resistance reduction effect, thereby obtaining the desired interior ballistic performance of the underwater ventilated launch. The findings offer recommendations for future underwater launchers.

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“…In general, the model of ventilated launch mainly includes an interior ballistic model, a turbulence model [17,18], and governing equations for gas-liquid flow [19,20].…”

Section: Governing Equationsmentioning

confidence: 99%

Effect of Starting Conditions on the Internal Flow Field and Interior Ballistic Performance of an Underwater Ventilated Launch

Zhang,

Hu,

2023

JMSE

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“…In order to properly assess the changes in the flow field, numerous researchers utilized high-speed photography to capture images of the flow in the pump during the visualization experiment. 15 Zhao et al 16 and Shao et al 17 utilized HSP technology to photograph the internal flow field of a centrifugal pump in order to study the dynamic behavior of bubbles and their effect on the pump's flow pattern. Different flow patterns were observed in the suction chamber and impeller.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the flow field characteristics of a centrifugal blood pump in a heartbeat cycle

Zhang,

Yang,

Shao

2024

Advances in Mechanical Engineering

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Blood pumps are medical devices that can temporarily or permanently replace the heart to perform the job of blood pumping. To study the internal flow field characteristics of the centrifugal blood pump, high-speed photography (HSP) images of the internal flow in the centrifugal blood pump were taken, and the internal flow field was numerically simulated. According to the heartbeat rule, the visualization experiment method and numerical simulation method for the internal flow of the centrifugal blood pump were developed. The internal flow rule of the centrifugal blood pump during a heartbeat cycle was revealed, as well as the influence of pump construction, flow rate, and other factors on the pump’s flow field. The results indicate that the flow rate and the rotor/stator interference of the blade and volute tongue cause two periodic changes in the pump pressure and velocity. One is the cycle of the heartbeat, and the other is the cycle of the blade’s rotation. The research results are of great significance in reducing the mechanical damage of blood, optimizing the structure of the pump and improving the stability of the centrifugal blood pump.

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“…Rehman et al (2015a) investigated the complex flow behaviour of a centrifugal pump under five different flow rates. Shao et al (2021aShao et al ( , 2021b) used a high-speed camera to conduct visual experiments and study the flow law inside a pump under various operating conditions. Subsequently, research on the noise induced by gasliquid two-phase flow in the pump was conducted, and the noise mechanism caused by the gas-liquid two-phase flow in the pump was preliminarily elaborated.…”

Section: Introductionmentioning

confidence: 99%

Impact of Transient Gas Injection on Flow-Induced Noise in Centrifugal Pumps

2023

JAFM

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The influence of inlet gas volume fractions on flow-induced noise in centrifugal pumps during the transition process of gas injection and the generation mechanism of noise in this process was studied. To this end, numerical simulations of the flow and sound fields as well as visual experiments of the flow field were conducted. The variation laws of the flow field, frequency-domain sound field, and time-domain sound field during the process were investigated. The relationship between the pressure pulsation and flow-induced noise was analysed in detail. The results indicate that it is more reasonable to consider the outlet gas volume fraction as the judgement criterion for the end of the transition process. The axial and blade passing frequencies are characteristic discrete frequencies in this process. The pressure pulsation and sound pressure level at the blade passing frequency are stable in the early stage of the process. Subsequently, they decrease first and then increase in the middle stage and return to a stable state in the final stage. The variation laws of the two exhibit consistency, indicating that the pressure pulsation directly induces a change in the sound pressure level. Furthermore, the injection of gas can weaken the disturbance effect of the blade.

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Study on the prediction method and the flow characteristics of gas-liquid two-phase flow patterns in the suction chamber

Cited by 6 publications

References 30 publications

Effect of Starting Conditions on the Internal Flow Field and Interior Ballistic Performance of an Underwater Ventilated Launch

Effect of Starting Conditions on the Internal Flow Field and Interior Ballistic Performance of an Underwater Ventilated Launch

Analysis of the flow field characteristics of a centrifugal blood pump in a heartbeat cycle

Impact of Transient Gas Injection on Flow-Induced Noise in Centrifugal Pumps

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