Research of Smoke Isolating with Air Curtain at Ship’s Tunnel

2012 ◽  
Vol 516-517 ◽  
pp. 111-114
Author(s):  
Xiao Jun Zhu ◽  
Chen Hua Zhong
Keyword(s):  
Heat Exchange ◽  
Flow Field ◽  
Air Curtain ◽  
Heat Control ◽  
The Way

The rapid spreading of poisonous smoke is the main reason which causes death in ship fires. Ships always have long tunnels to traveling passengers or cargos. Because of their longness and straightness, smoke diffuses rapidly. Fire doors are used to stop the smoke from spreading into other parts in vessels. When the fire doors are closed, the way for evacuation is also closed. So it’s important for the professionals to develop a kind of smoke-preventing device which can let people pass by when stopping the smoke. The air curtain is a kind of smoke isolating device which is used to decrease the heat exchange in supermarket or freezer. This paper analyzes flow field, the heat control and the smoke isolating ability of air curtain used in the ships’ long tunnels with different jet angles and initial velocities. At last, a suitable angle is proposed.

Numerical Simulation of Eddy Air-Curtain Dust Controlled Flow Field in Hard Rock Mechanized Driving Face

2012 ◽  
Vol 214 ◽  
pp. 440-444
Author(s):  
Wei Min Cheng ◽  
Wen Nie ◽  
Gang Zhou ◽  
Jun Lei Yang ◽  
Wen Zhou Du ◽  
...  
Keyword(s):  
Flow Field ◽  
Hard Rock ◽  
Equation Model ◽  
Polymer Materials ◽  
Radial Clearance ◽  
Air Curtain ◽  
Controlled Flow ◽  
Full Face ◽  
Local Dust ◽  
The Mathematical Model

The author established the mathematical model of single-phase flow of gas based on the k-ε two-equation model and numerically simulated the eddy air-curtain dust controlled flow field in hard rock mechanized driving face with the help of FLUENT software.The result showed that, after all the pressure ventilation blown out by the radial clearance of mural cylinder, a full-face eddy air-curtain flow field is formed at the roadway section, forming the air-curtain dust controlled flow field that presses the tunneling place equally in front of the driver of roadheader. After the application of the development of new light polymer materials radial cylinder eddy air-curtain dust controlled system was adopted in hard rock mechanized driving face of north conveyor main roadway, reducing the local dust concentration effectively.

scholarly journals Heat exchange performance optimization of a wheel loader cooling system based on computational fluid dynamic simulation

2018 ◽  
Vol 10 (11) ◽  
pp. 168781401880398 ◽  
Author(s):  
Chao Yu ◽  
Sicheng Qin ◽  
Yang Liu ◽  
Bosen Chai
Keyword(s):  
Heat Exchange ◽  
Flow Field ◽  
Thermal Management ◽  
Cooling System ◽  
Management Model ◽  
Maximum Deviation ◽  
Engine Compartment ◽  
Wheel Loader ◽  
Exchange Performance ◽  
Transmission Oil

This study establishes a thermal management model to improve the heat exchange performance and uniformity of the flow-field distribution in the engine compartment of a wheel loader. Flow-field analyses are performed for an XG956 wheel loader in a virtual wind tunnel using the combined engine compartment thermal management model and computational fluid dynamics. The Fluent calculations revealed various problems. For example, the inlet flow rate at both sides of the engine compartment is small, which accounts for about 8.5% of the total flow, and the flow uniformity of radiator becomes worse with the increase in the air flow. The original cooling system is improved based on the simulation results and then verified by field testing. A comparison of the test data with the simulations indicates that the values obtained using the thermal management model of the engine compartment are largely in agreement with the experimental values, with a maximum deviation of the heat transfer rate at the rated speed of 5.1%. The research method presented in this article could further help to increase the productivity of the non-road mobile machinery cooling system and lower design costs. The temperature of pressurized air, hydraulic oil, transmission oil, and engine cooling fluid decreased by 22.5%, 8.7%, 2.2%, and 8.4% in the improved loader, respectively.

scholarly journals Application of CFD technique for modelling of the thermoacoustic engine

2011 ◽  
Vol 32 (3) ◽  
pp. 175-190 ◽  
Author(s):  
Sebastian Rulik ◽  
Leszek Remiorz ◽  
Sławomir Dykas
Keyword(s):  
Flow Field ◽  
Numerical Modelling ◽  
Fluid Mechanics ◽  
Computational Technique ◽  
Thermoacoustic Engine ◽  
The Way

Application of CFD technique for modelling of the thermoacoustic engineThe paper is concerned with an important issue from the field of thermoacoustics - the numerical modelling of the flow field in the thermoacoustic engine. The presented way of modelling is based on the solution to fundamental fluid mechanics equations that govern the flow of compressible, viscous, and heat-transferring gas. The paper presents the way of modelling the thermoacoustic engine, the way of conducting calculations and the results which illustrate the correctness of the selected computational technique.

Numerical Simulation of Air Curtain Used in the Cold Store through Different Models

2013 ◽  
Vol 749 ◽  
pp. 554-560
Author(s):  
Jing Xie ◽  
Chen Miao ◽  
Zhi Li Gao ◽  
Jian Bing Shi ◽  
Tai Wang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Flow Field ◽  
Numerical Models ◽  
Air Flow ◽  
Boussinesq Approximation ◽  
Optimal Model ◽  
Air Curtain ◽  
Cold Store ◽  
Operation Rule

Air curtains are commonly used to cut off air flow between the cold store and hot environment, and reduce heat and mass transfer in order to maintain the low temperature in the cold store. CFD can be used to predict operation rule of air curtain used in the cold store intuitively and modelling is the most important part of numerical simulation of air curtain used in the cold store. In this study, different numerical models including standardmodel (with and without boussinesq approximation) and RSM (with and without boussinesq approximation) were used to simulate the temperature field and air flow field in the cold store and operation rule of air curtain used in the cold store after air curtain opened for 60s. Meanwhile, the actual operation of air curtain used in the cold store was tested and the simulation values were compared with the experimental values. The results showed that the velocity of the central mainstream decayed slowly, but the velocity of both sides of air curtain decayed fast. The optimal model used to predict the temperature field and air flow field in the cold store and operation rule of air curtain used in the cold store was standardmodel with boussinesq approximation, the relative error was within 20%. The optimal model can be used to predict the temperature field and air flow field in the cold store during different times in the future research.

Modeling for 3-D Temperature Field of Oil-Immersed Transformer

2011 ◽  
Vol 199-200 ◽  
pp. 1487-1491
Author(s):  
Su Xiang Qian ◽  
Ju Wu Xu ◽  
Xiao Jun Gu
Keyword(s):  
Temperature Field ◽  
Heat Exchange ◽  
Flow Field ◽  
Computer Experiment ◽  
Geometrical Model ◽  
Actual Situation ◽  
Traditional Methods ◽  
Ansys Cfx

The knowledge of temperature field of oil-filled transformer directly related to the judgment of overheated fault. There are mainly heat exchange, convection and their coupling in the transformer. Lot of traditional methods are not enough direct-viewing, and ignore the actual situation. The geometrical model of the transformer first modeled by Solidworks, and then ANSYS CFX is used to simulate the temperature field and flow field. Get a set of computer experiment result which can be reference. This computer experiment bring forth the method and effect of the simulate using that software, and make a foundation for the research of transformer overheated fault.

CFD Simulation of Insulation Performance of Air Curtain Used in the Cold Store

2013 ◽  
Vol 404 ◽  
pp. 425-431
Author(s):  
Chen Miao ◽  
Jing Xie ◽  
Zhi Li Gao ◽  
Zi Zhen Du ◽  
Jin Lin Zhu
Keyword(s):  
Flow Field ◽  
Cfd Simulation ◽  
Flow Distribution ◽  
Simulation Accuracy ◽  
Air Curtain ◽  
Hot Air ◽  
Cold Store ◽  
Simulation And Experiment ◽  
The Times ◽  
Insulation Performance

In order to realize the optimization of insulation performance of air curtain used in the cold store. The unsteady state simulation of the flow field of air curtain used in the cold store was studied by the CFD software to predict variation of the flow field in the cold store after door and air curtain were opened and the time of the flow field of the cold store arriving to be uniform. The experimental verification was also taken. The simulation results reflected that the temperature of the upper area closing to the door increased first and then decreased, then increased. The intrusive hot air destroyed the original uniform air flow distribution and caused the formation of the swirling eddy. When the whole flow field of the cold store was uniform, the swirling eddy disappeared. The re-circulation moved forward the lower left side of the cold store, which was caused by the intrusive hot air. Local mesh refinement could improve the simulation accuracy and be useful to analyse the flow characteristic of the air curtain. The times of the flow field in the cold store arriving to be uniform predicted by the numerical simulation and experiment after door and air curtain being opened were 5 min and 6 min, respectively. This study will provide useful references for optimization of insulation performance of air curtain.

Studies of heat regulation in the sheep, with special reference to the Merino

1950 ◽  
Vol 1 (2) ◽  
pp. 200 ◽  
Author(s):  
DHK Lee
Keyword(s):  
Heat Exchange ◽  
Special Reference ◽  
Heat Balance ◽  
Present Knowledge ◽  
Thermal Physiology ◽  
Animal Body ◽  
Animal Economy ◽  
The Way

This paper is a tentative application to a particular animal, the sheep, of concepts concerning heat regulation in "warm-blooded" animals, built up over ten years of laboratory, field, and library inquiry. The heat exchange between the animal and its environment is first analysed in a quantitative, physical fashion, and the deficiencies in present knowledge are pointed out. The ways in which the animal body attempts to maintain a heat balance are next considered, and the secondary consequences of these processes to the animal economy indicated. The paper concludes with a brief consideration of the comparative aspects. It is essentially a formulation of the way in which the thermal physiology of any animal should be considered, using the sheep as a convenient example. Many of the data are drawn from work carried out under the author's direction.

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