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Wang G.-X.,Harbin Engineering University | Xu W.,Harbin Engineering University | Hu H.-Z.,Csic Harbin No 703 Research Institute | Guo L.-J.,Harbin Engineering University
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2013

By using both traditional static analytic method and contact finite element one, with the integral and complex assembly model serving as the calculation models respectively, verified was the fatigue strength of the connecting rod assembly of a diesel engine, and compared and analyzed were the above-mentioned two methods. Finally, the tension and compression stress and strain tests of the connecting rod electronically measured by a static force were designed and completed. The test results show that the stress of the connecting rod will increase linearly with an increase of the load. In the regions where the stress is small, the calculated values will be slightly bigger than the actually measured ones, however, the simulated and calculated values in the main stress region will be always relatively accurate and the overall calculated stress value will be relatively in agreement with the test one. Therefore, the effectiveness and reliability of both methods in question for analyzing the strength of the connecting rod assembly are verified. Source


Gao L.,Harbin Engineering University | Zheng Q.,Harbin Engineering University | Li D.-X.,Csic Harbin No 703 Research Institute | Chen H.,Harbin Engineering University
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2013

To enhance the off-design performance of a high pressure steam turbine, the rear-loaded blade profiles were used to improve the stator blades in the two last stages of the above-mentioned turbine and the aerodynamic performance tests were performed of the prototype and improved blade plane cascade at various Mach numbers and attack angles. The test results show that the improved rear-loaded blade profiles can shorten the length of the counter-pressure gradient section at the outlet of the suction surface of the blade, thus reducing the counter pressure gradient value and enhancing the adaptability of the blades to various attack angles. In the meantime, the thin trailing edges of the rear-loaded blade profiles can reduce the width of the wake zone. In various versions, the blade loss of the improved blade profiles is invariably lower than that of the prototype. The test results show that to optimize the stator blade profiles and replace the diaphragms with new ones can both enhance the off-design condition performance of the high pressure steam turbine and produce better economic benefits. Source


Zheng H.-T.,Harbin Engineering University | Li Y.-J.,Harbin Engineering University | Li Y.-J.,Csic Harbin No 703 Research Institute | Cai L.,Csic Wuhan No 701 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014

By using the software Fluent, the authors studied the ignition location and flame propagation process in the combustor of a gas turbine with the optimum ignition location, turbulent flow flame propagation speed and flame propagation characteristics of the combustor being obtained. It has been found that it is capable of finding out the optimum ignition location inside the combustor by using the method gradually shortening the flame core radius. At the optimum ignition location, there exists a secondary return flow zone and its presence ensures a successful ignition while the main flow return zone plays a role of stabilizing the flame. The secondary and main flow return zones play an irreplaceable role in the ignition process of the combustor. The vaporization of the oil drops leads to a delay of the ignition and the turbulent flow flame propagation speed is around 6.5 m/s. Source


Xu N.,Harbin Institute of Technology | Xu N.,Csic Harbin No 703 Research Institute | Liu Z.-S.,Harbin Institute of Technology | Dong Y.-Y.,Harbin Institute of Technology | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

Aiming at larger vibration problems of gas turbine rotor in transition states, the transient rotor dynamic model was established. The thermal deformation of the rotor was equivalent to the bending excitation force based on the analysis of rotor thermal deformation. The transient response characteristics of the rotor under the bending excitation force in the process of fast start-up, those under thermal deformation and unbalanced coupling excitation, and the transient response characteristics of the rotor with thermal deformation decaying in the start-up process were analyzed. The study results provided a theoretical basis for studying gas turbine rotor thermal-induced vibration characteristics. ©, 2015, Chinese Vibration Engineering Society. All right reserved. Source


Long Y.-L.,Harbin Engineering University | Xu L.-M.,Csic Harbin No 703 Research Institute | Yu J.-L.,Csic Harbin No 703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2012

Based on a speed triangle design conception for elementary stages with a large deflection angle, a numerical calculation was performed of a total of 324 flow fields of a plane cascade by using a CFD software, including three air inlet mach numbers, six air inlet angles, three pressure diffusion factors, three cascade solidities and two blade profile maximal thickness ratios. To enhance the performance of the new type cascade, an artificial neural network was employed to constitute an approximate function based on the database sample space and the genetic algorithm was used to look for new designs and predict their aerodynamic performances. Furthermore, the mid-arc line and thickness distribution were optimized and the total pressure loss coefficient has decreased by 14.48% after the optimization. Source

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