摘要 :
Based on the infrared temperature measurement technology, in this paper, the effect of the purge flow from the upstream slot on the film cooling performance of the annular cascade endwall was studied experimentally. GE's E~3 turbi...
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Based on the infrared temperature measurement technology, in this paper, the effect of the purge flow from the upstream slot on the film cooling performance of the annular cascade endwall was studied experimentally. GE's E~3 turbine first stage stator blades is selected as the experimental reference blade type in this experiment. In the current experiment, effects of different slot locations, slot ejection angles and slot profiles on the endwall film cooling effectiveness were taken into account. Under the influence of endwall secondary flow, the film cooling is mainly concentrated on the front part of the channel and close to the suction side of the blade, while there is almost no cooling effect close to the pressure side of the blade in the channel. With the increase of the distance between the blade leading edge and the slot, the endwall film cooling performance is reduced. While the distance increasing from 0.15C_x to 0.45C_x, and the peak endwall film cooling effectiveness is reduced by 78%, 68% and 58% respectively when the mass flow ratio (MFR) is 1.0%, 1.5%, and 2.0%. As the slot ejection angle is reduced, the endwall film cooling performance can be effectively improved. When the slot ejection angle increased from 45° to 90° , the peak endwall film cooling effectiveness decreases by 17%, 15%, and 13% respectively at the mass flow ratio (MFR)=1.0%,1.5% and 2.0%. And the convergent slot can effectively improve the endwall cooling film formed by slot jet compared to the reference slot. When the mass flow ratio are MFR=1.0%, 1.5%, and 2.0%, the peak endwall film cooling effectiveness at the convergent slot is increased by 50%, 20%, and 15% comparing to the reference slot.
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摘要 :
Based on the infrared temperature measurement technology, in this paper, the effect of the purge flow from the upstream slot on the film cooling performance of the annular cascade endwall was studied experimentally. GE's E~3 turbi...
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Based on the infrared temperature measurement technology, in this paper, the effect of the purge flow from the upstream slot on the film cooling performance of the annular cascade endwall was studied experimentally. GE's E~3 turbine first stage stator blades is selected as the experimental reference blade type in this experiment. In the current experiment, effects of different slot locations, slot ejection angles and slot profiles on the endwall film cooling effectiveness were taken into account. Under the influence of endwall secondary flow, the film cooling is mainly concentrated on the front part of the channel and close to the suction side of the blade, while there is almost no cooling effect close to the pressure side of the blade in the channel. With the increase of the distance between the blade leading edge and the slot, the endwall film cooling performance is reduced. While the distance increasing from 0.15C_x to 0.45C_x, and the peak endwall film cooling effectiveness is reduced by 78%, 68% and 58% respectively when the mass flow ratio (MFR) is 1.0%, 1.5%, and 2.0%. As the slot ejection angle is reduced, the endwall film cooling performance can be effectively improved. When the slot ejection angle increased from 45° to 90° , the peak endwall film cooling effectiveness decreases by 17%, 15%, and 13% respectively at the mass flow ratio (MFR)=1.0%,1.5% and 2.0%. And the convergent slot can effectively improve the endwall cooling film formed by slot jet compared to the reference slot. When the mass flow ratio are MFR=1.0%, 1.5%, and 2.0%, the peak endwall film cooling effectiveness at the convergent slot is increased by 50%, 20%, and 15% comparing to the reference slot.
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More and more attentions were got by people about the research on mining truck driving comfort. As the vibration transfer terminal, cab is one of the important part of mining truck vibration control. In this paper, based on partic...
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More and more attentions were got by people about the research on mining truck driving comfort. As the vibration transfer terminal, cab is one of the important part of mining truck vibration control. In this paper, based on particle damping technology and its application characteristics, through the discrete element modeling, DEM & FEM coupling simulation and analysis, lab test verification and actual test in the truck, particle damping technology was successfully used in driver's seat base of mining truck, cab vibration was reduced obviously, meanwhile applied research and method of particle damping technology in mining truck vibration control were provided.
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A viscous fan clutch with double grooves is taken as a studying example for measuring its slip and surface temperatures. The grooves between driving and driven plate of the viscous clutch are filled with silicone-oil in this study...
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A viscous fan clutch with double grooves is taken as a studying example for measuring its slip and surface temperatures. The grooves between driving and driven plate of the viscous clutch are filled with silicone-oil in this study. Experimental methods and test rig to measure the slip and surface temperatures for a viscous clutch are discussed. The relations of the clutch slip and clutch surface temperatures with the change of the input speed are measured.
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摘要 :
A viscous fan clutch with double grooves is taken as a studying example for measuring its slip and surface temperatures. The grooves between driving and driven plate of the viscous clutch are filled with silicone-oil in this study...
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A viscous fan clutch with double grooves is taken as a studying example for measuring its slip and surface temperatures. The grooves between driving and driven plate of the viscous clutch are filled with silicone-oil in this study. Experimental methods and test rig to measure the slip and surface temperatures for a viscous clutch are discussed. The relations of the clutch slip and clutch surface temperatures with the change of the input speed are measured.
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摘要 :
The midwater trawl is used widely in many oceanic fisheries. In this study, the midwater trawl dynamical behavior was simulated and modeled with the mathematical mechanic equations based on R language platform. A lump-mass and spr...
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The midwater trawl is used widely in many oceanic fisheries. In this study, the midwater trawl dynamical behavior was simulated and modeled with the mathematical mechanic equations based on R language platform. A lump-mass and spring method was used to build the physical model. The huge mathematical stiff differential equations were solved by an implicit algorithm. On the R platform, the programming, simulation and visualization of the model were done quickly. The three-dimensional dynamical behavior of the midwater trawl in steady flow was presented successfully and the effectiveness of this method was verified. And the results were accord with the actual measured data in the ocean.
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摘要 :
The midwater trawl is used widely in many oceanic fisheries. In this study, the midwater trawl dynamical behavior was simulated and modeled with the mathematical mechanic equations based on R language platform. A lump-mass and spr...
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The midwater trawl is used widely in many oceanic fisheries. In this study, the midwater trawl dynamical behavior was simulated and modeled with the mathematical mechanic equations based on R language platform. A lump-mass and spring method was used to build the physical model. The huge mathematical stiff differential equations were solved by an implicit algorithm. On the R platform, the programming, simulation and visualization of the model were done quickly. The three-dimensional dynamical behavior of the midwater trawl in steady flow was presented successfully and the effectiveness of this method was verified. And the results were accord with the actual measured data in the ocean.
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RFID is a high-tech, which has a unique advantage in data collection and data transmission. Data mining is a powerful data analysis and data processing technique. With modern aviation industry developing rapidly today, a great dea...
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RFID is a high-tech, which has a unique advantage in data collection and data transmission. Data mining is a powerful data analysis and data processing technique. With modern aviation industry developing rapidly today, a great deal of information and automation technology is also used in air materials management system to improve efficiency. The air materiels management system designed in this paper is based on RFID and data mining. In this paper the concept, system composition and advantages of RFID are introduced. The establishment of the basic framework of air materials management system is discussed,which includes RFID data collection system and the design of management system application. The importance of application of the data analysis module is emphasized.
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摘要 :
RFID is a high-tech, which has a unique advantage in data collection and data transmission. Data mining is a powerful data analysis and data processing technique. With modern aviation industry developing rapidly today, a great dea...
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RFID is a high-tech, which has a unique advantage in data collection and data transmission. Data mining is a powerful data analysis and data processing technique. With modern aviation industry developing rapidly today, a great deal of information and automation technology is also used in air materials management system to improve efficiency. The air materiels management system designed in this paper is based on RFID and data mining. In this paper the concept, system composition and advantages of RFID are introduced. The establishment of the basic framework of air materials management system is discussed,which includes RFID data collection system and the design of management system application. The importance of application of the data analysis module is emphasized.
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Traditional evaluation method of camouflage texture effect is subjective evaluation. It's very tedious and inconvenient to direct the texture designing. In this paper, a systemic and rational method for direction and evaluation of...
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Traditional evaluation method of camouflage texture effect is subjective evaluation. It's very tedious and inconvenient to direct the texture designing. In this paper, a systemic and rational method for direction and evaluation of camouflage texture designing is proposed. A new camouflage texture evaluation method based on WSSIM (Weight structural similarity) is given to access the effects of camouflage texture at first. Then nature image features between the camouflage texture and the background image are calculated to help direct the designing camouflage texture. Primary experimental results show that the proposed method is helpful for evaluation and design of the camouflage texture.
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