Entity

Time filter

Source Type

Shenyang, China

You X.-M.,Northeastern University China | Meng L.,Shenyang Blower Group Co. | Li L.-X.,Northeastern University China | Wen B.-C.,Northeastern University China
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2010

The mechanical properties of the closed impeller assembly in a heavy-duty turbine compressor was investigated under actual operating conditions. Based on FEM and nonlinear contact theory, the size and distribution of stress of the assembly were analyzed structurally in assembling process and under variable operating conditions. The results showed that the assembly cannot fail structurally due to the internal stress caused during its assembling. There are stable and non-stable operating regions of a closed impeller assembly and most of those assemblies will malfunction structurally if they work at a speed over 12?000?r/min. The analysis method proposed is highly practical in applications as a reference for the study on mechanical properties of other rotor assemblies. Source


Zhou S.-H.,Northeastern University China | Li C.-F.,Northeastern University China | Wang K.-Y.,Shenyang Blower Group Co. | Wen B.-C.,Northeastern University China
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2014

Due to the random characteristics of wind speed, the transmission system in wind turbine gearbox would produce complex vibration, which can cause internal structure fatigue of the drive system. In order to analyze the performance of the gearbox, the wind turbine gearbox system was divided into three-class gear transmission, and the dynamical models of spur gear, helical gear and planetary gear were built. On this basis, the dynamical model of the whole wind turbine gearbox system was established. The vibration differential equations of the drive system were derived through the Lagrange's equation, considering the meshing stiffness, meshing damping, comprehensive meshing error, eccentricity, gravity, bending-torsional coupling and support bearing. The model provides some theoretical reference for the characteristic analysis and vibration control of similar wind turbine gearbox system. Source


Liu T.,Xian Jiaotong University | Qi D.,Xian Jiaotong University | Tan J.,Xian Jiaotong University | Wang R.,Shenyang Blower Group Co. | Han F.,Xian Jiaotong University
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | Year: 2011

Research was done to improve the performance of a centrifugal compressor with adjustable inlet guide vanes. The concept of the ″equivalent prewhirl radius″ of the guide vane passage was proposed, and the method for improving the performance of a centrifugal compressor with adjustable inlet guide vanes was presented by increasing the equivalent prewhirl radius of the guide vane passage to raise the flow efficiency of the inlet guide vanes. Then several improvement schemes were designed for the guide vane passage of a TR400 single-stage and double-supporting-type centrifugal compressor, and for each improvement scheme, 3-dimensional numerical simulation was conducted on the flow field inside the compressor with the software NUMECA. The simulation result shows that when the best scheme is applied, the efficiency of the compressor increases by 0.6%-2.1%, and it increases more when the setting angle of the inlet guide vanes is large. This effect can be obtained for both positive prewhirl and negative prewhirl, while the profile and the airfoil of the vanes remain almost unchanged. Source


You X.-M.,Shenyang Ligong University | You X.-M.,Northeastern University China | Meng L.,Shenyang Blower Group Co. | Wen B.-C.,Northeastern University China
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2010

In order to understand mechanism of "bending shaft" during and after assembly occurred in the closed impeller assembly of large turbine compressor and to avoid this fault, an impeller assembly was studied by using FEM and the nonlinear contact theory. The magnitude and distribution of stress on the contact area between the hub and shaft were examined from end of assembly process until it became steady. Based on the obtained data, the structure of the impeller assembly was optimized to rationalize the contact stress distribution and its assemblability. The whole compressor test with the improved impeller assembly demonstrates that the fault rate of "bending shaft" has been reduced substantially. Source

Discover hidden collaborations