Effects of oil channels and oil flow rate on cooling performance of closed circuit axial piston transmission

The oil injection method was studied to maximize the cooling performance of an electric vehicle motor with a hairpin winding. The cooling performance of the motor using the oil cooling method is proportional to the contact area of the oil and the coil. A numerical analysis was conducted to examine the effect of the spray nozzle type on the oil flow. The dripping nozzle forms the thickest oil film on the coil, making it the most effective for cooling of hairpin-type motors. Subsequently, an experimental study was conducted to optimize the nozzle diameter and number of nozzles. When the inlet diameter and number was 6.35 mm and 6, the oil film formation rate was 53%, yielding the most uniform oil film. Next, an experiment was performed to investigate the effects of the oil temperature and flow rate on the oil flow. The oil film formation rate was the highest (83%) when the oil temperature was 40 °C and the flow rate was 6 LPM.

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Mathematical Modeling to Estimate the Critical Oil Flow Rate for Sand Production Onset in the Mansouri Oil Field with a Stabilized Finite Element Method

Journal of Porous Media ◽

10.1615/jpormedia.v12.i4.80 ◽

2009 ◽

Vol 12 (4) ◽

pp. 379-386 ◽

Cited By ~ 1

Author(s):

A. Kohandel Shirazi ◽

D. Mowla ◽

F. Esmaeilzadeh

Keyword(s):

Mathematical Modeling ◽

Finite Element Method ◽

Finite Element ◽

Flow Rate ◽

Oil Field ◽

Sand Production ◽

Stabilized Finite Element ◽

Stabilized Finite Element Method ◽

Oil Flow ◽

Element Method

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Cooling Performance Analysis of Outside Fins of the Closed Circuit Axial Piston Transmission

Machines ◽

10.3390/machines9010017 ◽

2021 ◽

Vol 9 (1) ◽

pp. 17

Author(s):

Chen Yang ◽

Long-jie Yu ◽

Junhui Zhang ◽

Jin-yuan Qian

Keyword(s):

Heat Transfer ◽

Heat Dissipation ◽

Mechanical Energy ◽

Closed Circuit ◽

Moderate Increase ◽

Frictional Loss ◽

Fin Thickness ◽

Axial Piston ◽

Positive Effect ◽

Peak Value

Realizing conversion between fluid power and mechanical energy, the closed circuit axial piston transmission (CCAPT) plays a vital and indispensable role in miscellaneous industries. The frictional loss and leakage loss inside the system give rise to the inevitable temperature rise. In order to prolong the life of the device, a cooling structure on the outside of the CCAPT is designed for promoting heat dissipation. Based on the relevant heat transfer law and the temperature distribution of internal machinery elements, a spiral fin structure is designed at the shell side. With the help of numerical simulation, the effects of fin height, fin pitch, and fin thickness on the thermal performance are studied. The flow field and temperature field on the outside of the fin structure are obtained as a guidance for enhancing heat dissipation effect. Results indicate that the area of rotating elements tend to accumulate heat, where more attention should be paid for a better cooling effect. In addition to this, a moderate increase of fin height, fin pitch and fin thickness has a positive effect on heat transfer enhancement. The peak value of Nusselt number is obtained with a fin height of 7.5 mm, which is about 2.09 times that of the condition without the fin structure. An increase in fin pitch improves both heat transfer performance and comprehensive performance at the same. When fin pitch is 30 mm, Nusselt numberincreases 104% over the original condition.

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Role of Shearing Dispersion and Stripping in Wax Deposition in Crude Oil Pipelines

Energies ◽

10.3390/en12224325 ◽

2019 ◽

Vol 12 (22) ◽

pp. 4325

Author(s):

Zhihua Wang ◽

Yunfei Xu ◽

Yi Zhao ◽

Zhimin Li ◽

Yang Liu ◽

...

Keyword(s):

Crude Oil ◽

Flow Rate ◽

Critical Flow ◽

Wax Deposition ◽

Dominant Effect ◽

Critical Flow Rate ◽

Oil Pipelines ◽

Oil Flow ◽

Shearing Mechanism

Wax deposition during crude oil transmission can cause a series of negative effects and lead to problems associated with pipeline safety. A considerable number of previous works have investigated the wax deposition mechanism, inhibition technology, and remediation methods. However, studies on the shearing mechanism of wax deposition have focused largely on the characterization of this phenomena. The role of the shearing mechanism on wax deposition has not been completely clarified. This mechanism can be divided into the shearing dispersion effect caused by radial migration of wax particles and the shearing stripping effect caused by hydrodynamic scouring. From the perspective of energy analysis, a novel wax deposition model was proposed that considered the flow parameters of waxy crude oil in pipelines instead of its rheological parameters. Considering the two effects of shearing dispersion and shearing stripping coexist, with either one of them being the dominant mechanism, a shearing dispersion flux model and a shearing stripping model were established. Furthermore, a quantitative method to distinguish between the roles of shearing dispersion and shearing stripping in wax deposition was developed. The results indicated that the shearing mechanism can contribute an average of approximately 10% and a maximum of nearly 30% to the wax deposition process. With an increase in the oil flow rate, the effect of the shearing mechanism on wax deposition is enhanced, and its contribution was demonstrated to be negative; shear stripping was observed to be the dominant mechanism. A critical flow rate was observed when the dominant effect changes. When the oil flow rate is lower than the critical flow rate, the shearing dispersion effect is the dominant effect; its contribution rate increases with an increase in the oil flow temperature. When the oil flow rate is higher than the critical flow rate, the shearing stripping effect is the dominant effect; its contribution rate increases with an increase in the oil flow temperature. This understanding can be used to design operational parameters of the actual crude oil pipelines and address the potential flow assurance problems. The results of this study are of great significance for understanding the wax deposition theory of crude oil and accelerating the development of petroleum industry pipelines.

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The Performance Analysis and Experimental Research of Multiple Oil Ports Axial Piston Pump which Able to Control the Movement of Differential Cylinder Directly in the Closed Circuit

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.308-310.388 ◽

2011 ◽

Vol 308-310 ◽

pp. 388-400

Author(s):

Xiao Gang Zhang ◽

Long Quan

Keyword(s):

Digital Simulation ◽

Flow Distribution ◽

Closed Circuit ◽

Piston Pump ◽

Distribution Area ◽

Axial Piston Pump ◽

Hydraulic Pump ◽

Asymmetric Flow ◽

New Type ◽

Axial Piston

In order to realize that an asymmetric flow piston pump can control an asymmetric differential cylinder, a proposal about the application of an asymmetric flow-distributing axial piston pump is put forward. The new type of piston pump can output the flows with two different values to control the movement of the differential cylinder directly in the closed circuit and realize much ideal result of the control of the differential cylinder by a single pump. Also a simulation model of the hydraulic pump is established under the circumstance of SimulationX software, considering the characteristics of the movement of an individual piston, the oil compressibility, and the flow distribution area changed with the rotation angle. The key data of the pump is defined by means of digital simulation. In particular, an analysis is made on the dimension of the unloading groove of the port plate and the characteristics of the flow pulse of the pump. Furthermore, an experimental model pump is manufactured, the basic performances of the pump is tested on the experimental platform at various rotatory speeds such as pressure, flow and noise, in the end the accuracy of the principle is verified.

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Cooling Performance Enhancement of Air-Cooled Condensers by Guiding Air Flow

Energies ◽

10.3390/en12183503 ◽

2019 ◽

Vol 12 (18) ◽

pp. 3503

Author(s):

Huang ◽

Chen ◽

Yang ◽

Du ◽

Yang

Keyword(s):

Mass Flow Rate ◽

Mass Flow ◽

Flow Rate ◽

Heat Dissipation ◽

Performance Enhancement ◽

Cooling System ◽

Wind Effects ◽

Cooling Performance ◽

Air Cooled Condensers ◽

Arc Shape

Adverse wind effects on the thermo-flow performances of air-cooled condensers (ACCs) can be effectively restrained by wind-proof devices, such as air deflectors. Based on a 2 × 300 MW coal-fired power generation unit, two types (plane and arc) of air deflectors were installed beneath the peripheral fans to improve the ACC’s cooling performance. With and without air deflectors, the air velocity, temperature, and pressure fields near the ACCs were simulated and analyzed in various windy conditions. The total air mass flow rate and unit back pressure were calculated and compared. The results show that, with the guidance of deflectors, reverse flows are obviously suppressed in the upwind condenser cells under windy conditions, which is conducive to an increased mass flow rate and heat dissipation and, subsequently, introduces a favorable thermo-flow performance of the cooling system. When the wind speed increases, the leading flow effect of the air deflectors improves, and improvements in the ACC’s performance in the wind directions of 45° and –45° are more satisfactory. However, hot plume recirculation may impede performance when the wind direction is 0°. For all cases, air deflectors in an arc shape are recommended to restrain the disadvantageous wind effects.

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An Experimental Investigation of Oil-Buffered Shaft Seal Flow Rates

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.3239679 ◽

1985 ◽

Vol 107 (1) ◽

pp. 170-180

Author(s):

W. N. Shade ◽

D. E. Hampshire

Keyword(s):

Experimental Investigation ◽

Flow Rate ◽

Primary Objective ◽

Shaft Seal ◽

Flow Rates ◽

Process Gas ◽

Face Seals ◽

Oil Flow ◽

Seal Oil ◽

Oil Exposure

An experimental investigation was conducted to identify an optimum oil-buffered shaft seal for use on centrifugal compressors, with the primary objective being minimal seal oil exposure to process gases that cause seal oil degradation or are toxic. Types of seals tested included smooth bore cylindrical bushings, spiral groove cylindrical bushings, radial outward-flow face seals, and radial inward-flow face seals. The influence of shaft speed, gas pressure, seal oil differential pressure, oil bypass flow rate, and oil supply temperature on process side seal oil flow rate was determined. The investigation revealed some surprising relationships between seal oil flow rates and the escape of process gas.

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Predicting oil flow rate through orifice plate with robust machine learning algorithms

Flow Measurement and Instrumentation ◽

10.1016/j.flowmeasinst.2021.102047 ◽

2021 ◽

Vol 81 ◽

pp. 102047

Author(s):

Abouzar Rajabi Behesht Abad ◽

Pezhman Soltani Tehrani ◽

Mohammad Naveshki ◽

Hamzeh Ghorbani ◽

Nima Mohamadian ◽

...

Keyword(s):

Machine Learning ◽

Flow Rate ◽

Learning Algorithms ◽

Machine Learning Algorithms ◽

Orifice Plate ◽

Oil Flow

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A Method for Automatic Measurement of Oil Flow Rate

International Journal Of Scientific Advances ◽

10.51542/ijscia.v2i6.9 ◽

2021 ◽

Vol 2 (6) ◽

Author(s):

Rzayev Ab.G. ◽

Asadova R.Sh. ◽

Gurbanov Z.G.

Keyword(s):

Control Systems ◽

Flow Rate ◽

Measuring Equipment ◽

Automatic Measurement ◽

Oil Industry ◽

Centralized Control ◽

Two Phase ◽

Oil Flow

The article deals with a problem related to the oil industry, in particular to measuring equipment, and can be applied to centralized control systems measuring the flow rate of two-phase (oil and water) three-component output of a group of wells.

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