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RISS 인기검색어
- 검색키워드
- 저자 : Cao Dengfeng (검색결과 4 건)
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Dengfeng Yang,Li’ang Cao,Yang Liu,Zhilian Zhang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.10
Based on the analysis of the plateau performance for a 6 cylinder 8.6 L turbocharged diesel engine, a novel gas turbocharging system (GTS) is proposed to recover the engine power at high altitudes. Besides, a rolling-reflux combustor is designed to meet the structural requirements of GTS as well as to reduce the flow loss. Both the structure of the rolling-reflux combustor and the cycle thermal calculation of the GTS were described in detail in present work. The performance changes and the fuel consumption rate with engine speed at different altitudes of the GTS are compared to the original engine. Results show that when the altitude changes from 3 km to 5 km, the torque and power of the diesel engine with GTS can be recovered to that at sea level. Then, the particle image velocimetry (PIV) test is performed to study the cold flow field at the cylinder head of the rolling-reflux combustor, and the flow conditions are analyzed in detail. Finally, the flow bench is built and the aerodynamic experiment is carried out to verify the effectiveness of GTS.
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Dengfeng Yang,Li’ang Cao,Ce Yang,Dazhong Lao,Harold Sun 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.6
In this work, the influence of thickness and solidity of guide vane on the unsteady flow of a radial inflow turbine with variable nozzle has been numerically studied. Three vanes with the thickness changes from 0.3 to 0.1 and the solidity changes from 1.43 to 2.86, were chosen for this study. By investigating the unsteady flow field, it is found that the vane with low thickness and high solidity (vane B) can reduce shock by 75 % compared to the vane with high thickness and low solidity (base model); meanwhile, it can also mitigate the nozzle endwall leakage flow thus improves the flow uniformity of rotor inlet. As the intensity of shock and nozzle leakage flow were mitigated, the aerodynamic loading fluctuation of rotor blade can be weakened effectively, which will lead to improved rotor blades forced response. However, at small opening, vane B shows about 0.5 % lower efficiency than the base model; at large open condition, the efficiency degradation of vane B is up to 1.4 %. Therefore, there is a trade-off between the efficiency and forced response when choosing the nozzle vane solidity and thickness.
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Research of Condition Health Sample Model based on Bootstrap Method for Hydropower Unit
Zhou Ye,Tang Shu,Cao Dengfeng,Pan Luoping 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.3
In this paper, long term trend data from condition monitoring systems of hydropower units was used to separate to grid cells based on the water head and active power, and to build the health sample model for abnormal evaluation. For the problem of insufficient monitoring samples on non-rated operating conditions, Bootstrap method is introduced for sample expansion and confidence interval calculation, thereby to achieve limit optimize settings of health sample of hydropower unit condition data, which is more approximate to practical engineering than normal approximation method, and has achieved a good result.
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Turbine Efficiency Measurement by Thermodynamic Test Method
Zhou Ye,Pan Luoping,Cao Dengfeng 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.4
According to the requirement of IEC60041, the paper introduces various turbine efficiency measurement methods, and analyzes their feature and difficulties, then gives a detailed introduction for the principle and requirement of thermodynamic test method. With an example of turbine efficiency test implemented in Costa Rica, the paper gives a complete test procedure and data calculation for thermodynamic method. Finally, a comparison and verification among thermodynamic method, ultrasonic method and Winter-Kennedy method has been made, the result shows that it has great advantage and effectivity for thermodynamic method when using in flow measurement of high water head turbine.
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