scholarly journals Heat Dissipation Performance of Loader-Digger Cooling System based on Simulation and Test Data

2020 ◽  
Author(s):  
Lei Li ◽  
Xi Chen ◽  
Di Liu ◽  
Hong-gen Zhou ◽  
Haiyan Wu
Keyword(s):  
Flow Field ◽  
Heat Dissipation ◽  
Cooling System ◽  
Internal Flow ◽  
Torque Converter ◽  
Balance Test ◽  
Cooling Fan ◽  
Cooling Chamber ◽  
Flow Field Characteristics ◽  
Air Cooler

Abstract High temperature of the radiator group is harmful to the power system and hydraulic system. In order to improve the heat dissipation performance of the loader, the flow field characteristics of the cooling chamber are analyzed by simulation and heat balance test. Firstly, the mathematical model of heat flow is established. Secondly, the flow field in the cooling chamber under different speeds is simulated based on CFX. And then the influence of fan position and internal flow field distribution on radiator performance is studied. Through the simulation of four different distances, it is concluded that the optimal distance between cooling fan and radiator is 76mm. Finally, a testing system is built for the temperature acquisition of engine water radiator, torque converter oil radiator, hydraulic oil radiator and air-to-air cooler of the hood structure, and then the simulation results are verified. The test results show that the heat dissipation performance of the whole machine meets the requirements after optimization, and the optimized scheme can make the loader-digger in an efficient and energy-saving operation state.

scholarly journals Heat Dissipation Performance of Loader-Digger Cooling System based on Simulation and Test Data

2020 ◽  
Author(s):  
Lei Li ◽  
Xi Chen ◽  
Di Liu ◽  
Hong-gen Zhou ◽  
Haiyan Wu
Keyword(s):  
Flow Field ◽  
Heat Dissipation ◽  
Cooling System ◽  
Internal Flow ◽  
Torque Converter ◽  
Balance Test ◽  
Simulation And Optimization ◽  
Cooling Chamber ◽  
Flow Field Characteristics ◽  
Air Cooler

Abstract High temperature of the radiator group is harmful to the power system and hydraulic system. In order to improve the heat dissipation performance of the loader, the flow field characteristics of the cooling chamber are analyzed by simulation and heat balance test. Firstly, the mathematical model of heat flow is established. Secondly, the flow field in the cooling chamber under different speeds is simulated based on CFX. And then the influence of fan position and internal flow field distribution on radiator performance is studied. Through the simulation of four different distances, it is concluded that the optimal distance between cooling fan and radiator is 76 mm. Finally, a testing system is built for the temperature acquisition of engine water radiator, torque converter oil radiator, hydraulic oil radiator and air-to-air cooler of the hood structure, and then the simulation and optimization results are verified.

scholarly journals An intelligent loader-digger heat balance system based on simulation and wireless sensor networks

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Lei Li ◽  
Xi Chen ◽  
Di Liu ◽  
Hong-gen Zhou ◽  
Haiyan Wu
Keyword(s):  
Flow Field ◽  
Heat Balance ◽  
Heat Dissipation ◽  
Internal Flow ◽  
Test System ◽  
Wireless Sensor ◽  
Balance Test ◽  
Balance System ◽  
Cooling Chamber ◽  
Flow Field Characteristics

Abstract High temperature of the radiator group is harmful to the power system and hydraulic system. In order to improve the heat dissipation performance of the loader, the flow field characteristics of the cooling chamber are analyzed by simulation and heat balance test. Firstly, the mathematical model of heat flow is established. Secondly, the flow field in the cooling chamber under different speeds is simulated based on CFX. And then the influence of fan position and internal flow field distribution on radiator performance is studied. Through the simulation of four different distances, it is concluded that the optimal distance between cooling fan and radiator is 76 mm. Finally, the heat balance test system based on wireless sensor network is established, and the simulation results are verified. The test results show that the heat dissipation performance of the whole machine meets the requirements after optimization. In this paper, the proposed scheme can dynamically adjust the heat dissipation performance and make the loader excavator in an efficient and energy-saving operation state.

scholarly journals An Intelligent Loader-Digger Heat Balance System based on Simulation and Wireless Sensor Networks

2020 ◽  
Author(s):  
Lei Li ◽  
Xi Chen ◽  
Di Liu ◽  
Honggen Zhou ◽  
Haiyan Wu
Keyword(s):  
Flow Field ◽  
Heat Balance ◽  
Heat Dissipation ◽  
Internal Flow ◽  
Test System ◽  
Wireless Sensor ◽  
Balance Test ◽  
Balance System ◽  
Cooling Chamber ◽  
Flow Field Characteristics

Abstract High temperature of the radiator group is harmful to the power system and hydraulic system. In order to improve the heat dissipation performance of the loader, the flow field characteristics of the cooling chamber are analyzed by simulation and heat balance test. Firstly, the mathematical model of heat flow is established. Secondly, the flow field in the cooling chamber under different speeds is simulated based on CFX. And then the influence of fan position and internal flow field distribution on radiator performance is studied. Through the simulation of four different distances, it is concluded that the optimal distance between cooling fan and radiator is 76mm. Finally, the heat balance test system based on wireless sensor network is established, and the simulation results are verified. The test results show that the heat dissipation performance of the whole machine meets the requirements after optimization. In this paper, the proposed scheme can dynamically adjust the heat dissipation performance and make the loader excavator in an efficient and energy-saving operation state.

Pressure Drop Mechanisms Generated in a Cooling System Enclosure of Construction Machinery

2021 ◽  
Author(s):  
Takashi Kawano ◽  
Masaki Fuchiwaki
Keyword(s):  
Pressure Drop ◽  
Flow Field ◽  
Cooling System ◽  
Three Dimensional ◽  
Reduced Pressure ◽  
Exhaust Port ◽  
Pressure Drops ◽  
Cooling Fan ◽  
Flow Field Characteristics ◽  
Heavy Construction

Abstract A potential way to reduce cooling system noises generated by heavy construction machines is to generate the required cooling airflow with a low fan speed, and one way to accomplish this is to optimize the ventilation path through which the airflow generated by the cooling fan must travel. However, while the computational fluid dynamics (CFD) approach would be effective for modeling the three-dimensional (3D) pressure drop characteristic of such systems, there have been few reports aimed at clarifying the loss generation mechanisms or suggesting minimization methods based on flow field viewpoints. Accordingly, in this study, we visualize the 3D flow field characteristics of an electric cooling fan system installed within the cooling enclosure of a heavy construction machine and investigate the details of the system’s pressure drop mechanisms. Our results confirm that airflow pressure declines in areas other than the radiator account for more than half of the reduced pressure experienced by the whole system. Additionally, we found that, in the exhaust side enclosure, pressure drops increased because the exhaust port outlet shapes were not optimized to the annular airflow of the cooling fan. Most notably, we found that in the region before reaching the exhaust port outlets, the airflow from the fan repeatedly collides with obstacles within the enclosure, thus producing stagnation and turbulence that exacerbates pressure drops before being expelled into the outside environment.

Experimental study on the effect of different components collocations on flow of automotive cooling fan

2019 ◽  
Vol 234 (1) ◽  
pp. 270-282 ◽  
Author(s):  
Suping Wen ◽  
Yuwei Hao ◽  
Zhixuan Zhang ◽  
Yifei Wang
Keyword(s):  
Flow Field ◽  
Flow Structure ◽  
Heat Dissipation ◽  
Cooling System ◽  
Flow Data ◽  
Engine Cooling ◽  
Cooling Fan ◽  
Downstream Region ◽  
Piv Measurement ◽  
Series Of Experiments

The flow structure in the downstream region of the cooling fan has great impact on engine heat dissipation. An integrated PIV measurement system was designed and constructed to understand the flow field behind the cooling fan. In order to analyze the influence of interaction of different components on flow structure in downstream region, a series of experiments were conducted in four arrangements at three flow coefficients. The flow field was evaluated by velocity profile, vorticity, and turbulent intensity. These flow data reflect the effect of isolated components and their combinations quantitatively. This work provides useful information for engine cooling system design.

scholarly journals Automobile Radiator’s Engineering and Analysation

2020 ◽  
Vol 9 (5) ◽  
pp. 554-558
Keyword(s):  
Flow Rate ◽  
Heat Dissipation ◽  
Cooling System ◽  
Volume Flow Rate ◽  
Air Flow ◽  
Temperature Drop ◽  
Inlet Temperature ◽  
Air Flow Rate ◽  
Air Velocity ◽  
Cooling Fan

The shape of a radiator cover is crucial either in determining the pattern of air flow or in increasing the same through the radiator core thereby increasing the thermal efficiency, thus making it a necessity to understand it. Moreover the parts circumjacent to the core namely the upper tank, lower tank, cooling fan, fins, tubes, etc promote the air flow rate. Also it is to note that the air flow rate of discharge gases from radiator core is one of the prime factors in determining the automobile cooling system. Initially factors such as temperature, pressure, air flow rate that affect the performance are obtained in order to derive out the entities of operation. One of the observations that can be made through this paper is that as the volume of the coolant increases, the rate of heat dissipation increases, also parameters like inlet temperature and volume flow rate of coolant, air velocity, temperature drop and drop in pressure of coolant are factors that contribute in radiator performance evidently.

Numerical Analysis of Flow Field Characteristics in Three-Z-Shaped Ultrasonic Flowmeter

2012 ◽  
Vol 226-228 ◽  
pp. 1829-1834 ◽  
Author(s):  
Jing Yuan Tang ◽  
Jian Ming Chen ◽  
Hong Bin Ma ◽  
Guang Yu Tang
Keyword(s):  
Flow Field ◽  
Cross Sections ◽  
Flow Direction ◽  
Fluid Velocity ◽  
Internal Flow ◽  
Reynolds Stress Model ◽  
Ultrasonic Flowmeter ◽  
Developed Turbulence ◽  
Fluid Field ◽  
Flow Field Characteristics

The flow field characteristics in U-typed bend has been extensively studied for transit time ultrasonic flowmeters designing, but for the flowmeter with three-Z-shaped round pipe there is still lack of corresponding research. This paper presents a computational fluid dynamics (CFD) approach for modeling of the three-Z-shaped ultrasonic flowmeter and studying of internal fluid field characteristics based on Reynolds stress model (RSM). The fluid velocity profile in the three ultrasound path is obtained using CFD and secondary flow in cross section also is analyzed. The simulation results show that the internal flow fields in the flowmeter are not fully developed turbulence with asymmetric axial velocity distribution and dramatic changes along the flow direction, and there are obvious secondary cross flows on theirs cross-sections. The CFD simulations provide useful insights into the flow field associated with ultrasonic flowmeters design.

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