Study of the flow in a cryogenic pump under different cavitation inducements by considering the thermodynamic effect

Shao, Changzheng; Zhang, Zhongyuan; Zhou, Jianfeng

doi:10.1108/hff-10-2019-0747

Cited by 12 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many studies have been done on conventional size of the centrifugal pumps. 2,3 As a mechanical equipment, the pump is also developing towards miniaturization, and has begun to enter the fields of precision electronic machinery, space exploration and medical treatment. 4 The micro centrifugal pumps are usually used as cardiac assist or replacement devices in the medical field.…”

Section: Introductionmentioning

confidence: 99%

Study on modeling test method and the critical Reynolds number of a micro centrifugal pump

Bao

Zhao

Shao

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

Self Cite

View full text Add to dashboard Cite

In order to test the performance of the micro centrifugal pump and carry out performance analysis by using water instead of blood as the test medium, a modeling test method of the micro centrifugal pump was proposed in this paper. Dimensional analysis method was applied to study the dimensionless characteristic number of the micro centrifugal pump. The SST (Shear Stress Transport) k-ω model was used to simulate the flow in the prototype pump and model pump. The correctness of the similarity theory and modeling schemes was verified. The performance of the micro centrifugal pump for transporting water and blood was studied under the same working conditions, and the effect of Reynolds number on the performance of the micro centrifugal pump was discussed. The external characteristics of similar pumps can be converted to each other. For similar pumps under different modeling schemes, the pressure and velocity at the corresponding position is proportional. When the micro centrifugal pump that transports blood operates at low rotational speed and low flow rate, the performance of the micro centrifugal pump will change dramatically. The critical Reynolds number of the micro centrifugal pump is determined to be 1200. The similarity criterion between the prototype pump and model pump was established. The modeling schemes of the micro centrifugal pump were formulated. The critical Reynolds number of the micro centrifugal pump was determined. The research results provide a new method for the performance test of the micro centrifugal pump transporting blood.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on modeling test method and the critical Reynolds number of a micro centrifugal pump

Bao

Zhao

Shao

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, the results show that the generation of vortex structure can enhance the turbulent intensity of the flow field, and there is a close relationship between vortex motion, turbulence and cavitation. Yuan et al (2019) carried out a numerical simulation of the cavitation jet flow and studied cavitation-vortex interaction deeply (Zhang et al , 2021; Ohta and Sugiura, 2019; Shao et al , 2020; Han et al , 2020) and the relationship between vorticity and energy loss (Fei et al , 2022). Their numerical results gave the periodic cavitation structure of quasi-steady flow, as well as the corresponding changes of vorticity distribution and large-scale vortex.…”

Section: Introductionmentioning

confidence: 99%

Cavitation characteristics and energy loss in high-pressure differential control valve

Jin

Wen

Wang

et al. 2023

HFF

View full text Add to dashboard Cite

Purpose The purpose of this study is to determine the cavitation flow characteristics of the high-pressure differential control valve. The relationship between cavitation, flow coefficient and spool angle is obtained. By analyzing the relationship between different spool angles and energy loss, the energy loss at different spool angles is predicted. Design/methodology/approach A series of numerical simulations were performed to study the cavitation problem of a high-pressure differential control valve using the RNG k–e turbulence model and the Zwart cavitation model. The flow states and energy distribution at different spool angles were analyzed under specific working conditions. Findings The cavitation was the weakest when the spool angle was 120° or the outlet pressure was 8 MPa. The pressure and speed fluctuations of the valve in the throttle section were greater than those at other locations. By calculating the entropy production rate, the reason and location of valve energy loss are analyzed. The energy loss near the throttling section accounts for about 92.7% of the total energy loss. According to the calculated energy loss relationship between different regions of the spool angle, the relationship between any spool angle and energy loss in the [80,120] interval is proposed. Originality/value This study analyzes the cavitation flow characteristics of the high-pressure differential control valve and provides the law of energy loss in the valve through the analysis method of entropy. The relationship between spool angle and energy loss under cavitation is finally proposed. The research results are expected to provide a theoretical basis for the optimal design of valves.

show abstract

“…The function of the suction chamber of a centrifugal pump is to introduce fluid into the impeller in certain conditions, so as to ensure that the fluid velocity at the impeller inlet meets the requirements. The flow pattern in the suction chamber directly affects the flow in the impeller and other flow passing parts, thus having a great impact on the efficiency and cavitation performance of pumps (Yao et al , 2012; Shao et al , 2020). Therefore, the study of the flow in the suction chamber under the condition of gas-liquid mixed transportation plays an important role in improving the design of centrifugal pumps and ensuring the efficient and stable operation of pumps.…”

Section: Introductionmentioning

confidence: 99%

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

Shao

Bao

Wang

et al. 2021

HFF

Self Cite

View full text Add to dashboard Cite

Purpose The purpose of this paper is to propose a prediction method of gas-liquid two-phase flow patterns and reveal the flow characteristics in the suction chamber of a centrifugal pump. Design/methodology/approach A transparent model pump was experimentally studied, and the gas-liquid two-phase flow in the pump was numerically simulated based on the Eulerian–Eulerian heterogeneous flow model. The numerical simulation method was verified from three aspects: the flow pattern in the suction chamber, the gas spiral length and the external characteristics of the pump. The two-phase flow in the suction chamber was studied in detail by using the numerical simulation method. Findings There are up to eight flow patterns in the suction chamber. However, at a certain rotational speed, only six flow patterns are observed at the most. At some rotational speeds, only four flow patterns appear. The gas spiral length has little relationship with the gas flow rate. It decreases with the increase of the liquid flow rate and increases with the increase of the rotational speed. The spiral flow greatly increases the turbulence intensity in the suction chamber. Originality/value A method for predicting the flow pattern was proposed. Eight flow patterns in the suction chamber were identified. The mechanism of gas-liquid two-phase flow in the suction chamber was revealed. The research results have reference values for the stable operation of two-phase flow pumps and the optimization of suction chambers.

show abstract

Study of the flow in a cryogenic pump under different cavitation inducements by considering the thermodynamic effect

Cited by 12 publications

References 25 publications

Study on modeling test method and the critical Reynolds number of a micro centrifugal pump

Study on modeling test method and the critical Reynolds number of a micro centrifugal pump

Cavitation characteristics and energy loss in high-pressure differential control valve

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

Contact Info

Product

Resources

About