Effects of Structural Parameters on Hydraulic Performance of Flow Regulator

2018 ◽  
Author(s):  
Yong Li ◽  
Xuemei Zong ◽  
Xiaoming Yuan ◽  
Shiyi Zhao
Keyword(s):  
Structural Parameters ◽  
Hydraulic Performance ◽  
Flow Regulator

scholarly journals Multiple Parameters and Target Optimization of Splitter Blades for Blood Pumps Using CFD and Neural Networks

2020 ◽  
Author(s):  
Zheqin Yu ◽  
Jianping Tan ◽  
Shuai Wang
Keyword(s):  
Neural Networks ◽  
Axial Length ◽  
Structural Parameters ◽  
Optimization Method ◽  
Hydraulic Performance ◽  
Performance Impact ◽  
Multiple Parameters ◽  
Micro Piv ◽  
Blood Pumps ◽  
Optimization Parameters

Abstract Background: The splitter blade is an improved structure effective in traditional pumps. However, applying splitter blades to blood pumps is a complex optimization problem with multiple parameters and objectives, because structural parameters, blood circulation dynamics, and blood damage need to be considered simultaneously. This study aims to obtain the performance impact of the splitter blade and make it well used in blood pumps through CFD and neural networks.Results: This study combines CFD and neural networks. And hydraulic experiments and PIV technology were used. In the optimization study, the number of blades, axial length, and circumferential offset are optimization parameters, and hydraulic performance and hemolytic prediction index are optimization targets. The study analyzes the influence of each parameter on performance and completes the optimization of the parameters. In the results, the optimal parameters of the number of blades, axial length ratio, and circumferential offset are 2, 6 °, and 0.41, respectively. Under optimized parameters, hydraulic performance can be significantly improved. And the results of hemolysis prediction and micro PIV experiments reflect that there is no increase in the risk of hemolytic damage.Conclusion: This study provides a method and ideas for improving the structure of the blood pump. The established optimization method can be effectively applied to the design and research of blood pumps with complex, high precision, and multiple parameters and targets.

scholarly journals Simulating the Effects of Structural Parameters on the Hydraulic Performances of Venturi Tube

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Yanqi Sun ◽  
Wenquan Niu
Keyword(s):  
Pressure Difference ◽  
Critical Pressure ◽  
Structural Parameters ◽  
Pressure Coefficient ◽  
Head Loss ◽  
Hydraulic Performance ◽  
Outlet Section ◽  
Minimum Pressure ◽  
Absorption Ratio ◽  
Contraction Ratio

The effects of Venturi structural parameters on its hydraulic performance were studied, which provided theoretical basis for the design of Venturi injector. With an inlet diameter of 50 mm, based on the method of computational fluid dynamics (CFD), the effects of the structural parameters (such as throat taper, throat contraction ratio, and throat length) on their hydraulic performance (such as outlet faceted average velocity, minimum pressure, and critical pressure) were studied under different inlet pressures and pressure differences between inlet and outlet. A power function relationship existed between the mean velocity in outlet section and pressure difference, with an approximate flow stance index of 0.53. Minimum pressure occurred in the throat inlet wall and there was a linear relationship between the minimum pressure and the pressure difference at the inlet and outlet. The throat contraction ratio was the main factor on the effect of Venturi injector performance, which was positively correlated with outlet velocity, negatively to critical pressure, the minimal in-tube pressure, coefficient of local head loss, and fertilizer absorption ratio. For designing Venturi injector, contraction ratio should be reasonably selected according to the coefficient of local head loss and fertilizer absorption ratio.

scholarly journals Experimental and Numerical Study on Hydraulic Performance of Chevron Brazed Plate Heat Exchanger at Low Reynolds Number

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1076
Author(s):  
Yi Zhong ◽  
Kai Deng ◽  
Shenglang Zhao ◽  
Jinlin Hu ◽  
Yingjie Zhong ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Power Law ◽  
Numerical Study ◽  
Structural Parameters ◽  
Hydraulic Performance ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
Brazed Plate Heat Exchanger

Few experiments have been performed to investigate the hydraulic performance in a chevron brazed plate heat exchanger (BPHE) with the narrow channel at lower Reynolds number. The hydraulic characteristics of seven types of chevron BPHEs were investigated experimentally and numerical simulation revealed the effects of structural parameters on hydraulic performances. The correlations between friction factor f and Re were fitted out based on more than 500 sets of pressure drop data. The research results show that there is a power-law between f and Re; which has a similar trend but a different amplitude for different plates, and the exponent of the power-law could be approximate to a constant. Numerical results show that the pressure drop Δp is positively correlated with the corrugated angle and spacing, however, negatively correlated with the corrugated height. Research on the hydraulic performance is significant for the optimal design of BPHE.

scholarly journals Investigation on the Characteristics of a Combination Microflow Control Valve

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yuqi Wang ◽  
Xinhui Liu ◽  
Jinshi Chen ◽  
Yafang Han ◽  
Siyuan Liu ◽  
...  
Keyword(s):  
Flow Rate ◽  
Structural Parameters ◽  
Flow Characteristics ◽  
Control Valve ◽  
Hydraulic Systems ◽  
Flow Area ◽  
Port Area ◽  
Rate Fluctuation ◽  
Calculation Results ◽  
Flow Regulator

Flow control valves have broad application prospects in aviation hydraulic systems. This paper proposes a combination microflow control valve (CMCV) instead of the traditional valve to optimize the performance. Influences of structural parameters of CMCV on its characteristics are numerically investigated to determine the static and dynamic characteristics of CMCV. The calculation results indicate that there is a negative feedback control between stages of the flow regulator, the orifice pressure drop is compensated, and the flow regulation deviation is reduced. The orifice area and the flow regulator valve port area have significant effects on flow characteristics. The diameter of orifice, the spring stiffness, the number of throttle holes, and the ultimate displacement of sleeve are positively correlated with the flow rate stability value of the valve. The valve port flow area gradient and initial overlap of the flow regulator affect the flow rate fluctuation range and response time of CMCV.

scholarly journals Structure design and thermal-hydraulic performances study on tube-on-sheet heat exchanger

2020 ◽  
pp. 311-311
Author(s):  
Fei Wang ◽  
Guifeng Gao ◽  
Zhilong Lu ◽  
Gaoyun Zhou ◽  
Linghui Chen ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Heat Exchanger ◽  
Low Temperature ◽  
Structural Parameters ◽  
Hydraulic Performance ◽  
Structure Design ◽  
Structure Parameters ◽  
Hydraulic Characteristics ◽  
Main Structure ◽  
Fin Length

A numerical investigation is performed to study the thermal-hydraulic performances of tube-on-sheet heat exchanger. Especially, this paper is focused on the effects of the structure parameters (fin angles, fin lengths, fin pitches, fin widths and tube arc radius) on the thermal-hydraulic characteristics of the heat exchanger. The heat exchanger optimized structural parameters are obtained. The results reveal that main structure parameters on thermal-hydraulic performance are fin angle, fin length, fin pitch and fin width. Furthermore, decreasing the fin angle, fin pitch and fin width or increasing the fin length cause thermal hydraulic performance to increase. In addition, main structure parameters on low temperature corrosion are tube arc radius and fin length. Decreasing the tube arc radius and fin length can mitigate low temperature corrosion. Furth, stainless steel is choosing as the material for the heat exchanger to reduce corrosion.

Optimal design of a high homogeneous and small-size shim coil for atomic spin gyroscope based on 0-1 linear programming

2020 ◽  
Vol 64 (1-4) ◽  
pp. 165-172
Author(s):  
Dongge Deng ◽  
Mingzhi Zhu ◽  
Qiang Shu ◽  
Baoxu Wang ◽  
Fei Yang
Keyword(s):  
Linear Programming ◽  
Power Consumption ◽  
Low Power ◽  
Optimization Design ◽  
Structural Parameters ◽  
Axial Position ◽  
Low Power Consumption ◽  
Optimal Method ◽  
Atomic Spin ◽  
Shim Coil

It is necessary to develop a high homogeneous, low power consumption, high frequency and small-size shim coil for high precision and low-cost atomic spin gyroscope (ASG). To provide the shim coil, a multi-objective optimization design method is proposed. All structural parameters including the wire diameter are optimized. In addition to the homogeneity, the size of optimized coil, especially the axial position and winding number, is restricted to develop the small-size shim coil with low power consumption. The 0-1 linear programming is adopted in the optimal model to conveniently describe winding distributions. The branch and bound algorithm is used to solve this model. Theoretical optimization results show that the homogeneity of the optimized shim coil is several orders of magnitudes better than the same-size solenoid. A simulation experiment is also conducted. Experimental results show that optimization results are verified, and power consumption of the optimized coil is about half of the solenoid when providing the same uniform magnetic field. This indicates that the proposed optimal method is feasible to develop shim coil for ASG.

A Possible Basis for Nondestructive Characterization of Ropes of Nylon 6

1997 ◽  
Vol 503 ◽  
Author(s):  
H. Jiang ◽  
M. K. Davis ◽  
R. K. Eby ◽  
P. Arsenovic
Keyword(s):  
Tensile Strength ◽  
Service Life ◽  
Fiber Diameter ◽  
Structural Parameters ◽  
Crystal Form ◽  
Nylon 6 ◽  
Remaining Service Life ◽  
Nondestructive Characterization ◽  
Fractional Content

ABSTRACTPhysical properties and structural parameters have been measured for ropes of nylon 6 as a function of the number of use operations. The fractional content of the α crystal form, sound velocity, birefringence, tensile strength and length all increase systematically and significantly with increasing the number of use operations. The fractional content of the γ crystal form and fiber diameter decrease with use. These trends indicate that the measurement of such properties and structural parameters, especially the length, provide a possible basis for establishing a reliable, rapid, and convenient nondestructive characterization method to predict the remaining service life of nylon 6 ropes.

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