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Ge L.-S.,Shanghai University | Wang H.-G.,Shanghai University | Liu J.-L.,Csic Harbin No703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014

By using three models, i. e. MPC, MPC+beam and MPC+rbe2, the authors simulated the riveted impeller of a centrifugal fan. By employing the Optistruct solver of the software HyperWorks, the authors calculated the modal of the three models and the distribution of the stress produced by the centrifugal force. The calculation results indicate that different models exert no influence on the modal and vibration, however, exercise certain influence on the intrinsic frequency. During the modal analysis, when the rigidity of the rivets is far greater than that of the parts connected, it is recommended to use MPC model. When the rigidity of the rivets is greater than that of the parts connected, it is recommended to adopt MPC+rbe2 model. When the rigidity of the rivets is close to that of the parts connected, it is recommended to use MPC+beam model. The riveting places and locations nearing the hub rims have a relatively big and concentrated stress and the maximum stress appears at the riveting places in the rim of the hub. When the strength of a riveted structure is being quantitatively analyzed, it is recommended to use the MPC+beam model. When the stress distribution of a riveted structure is being qualitatively analyzed, it is recommended to use the MPC model. Source


Long Y.-L.,Harbin Engineering University | Xu L.-M.,Csic Harbin No703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2010

For a helium compressor, if the law for designing a conventional air compressor was adopted, its pressure ratio in any single stage would be small and an excessively large number of stages shall be required. To this end, a speed triangle at a big deflection angle applicable for helium was analyzed and described. On the basis of a calibration first conducted of the turbulent flow model and mesh division being chosen, the fluid analytic software Fluent was employed to perform a numerical simulation of the helium flow fields in the cascades with a big deflection angle. The numerical simulation results show that compared with the conventional design, when the inlet mach number ranges from 0.466 to 0.7013, the power increment of the elementary stage designed by using the blade profile under discussion can be increased several times, thus reducing several times over the number of stages in the helium compressor while the efficiency of the blade profile still attains from 0.939 to 0.894. Basically, no separation phenomena emerge in its flow field. Source


Yi S.,Harbin Engineering University | Li S.-Y.,Harbin Engineering University | Xu Z.-Q.,Csic Harbin No703 Research Institute | Yang Z.-W.,Csic Harbin No703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014

In the light of such specific features as several signs of a fault during the actual operation of the fuel system of a gas turbine and difficulty in obtaining single and standard fault data, put forward was a method for diagnosing any faults of a fuel system based on a self-organized neural network. The method in question chosen proper fault characteristic parameters of the fuel system to form a sound and correct analytic network for diagnosing any faults by establishing a model for diagnosing faults of a fuel system. With the operating state of the fuel system of an industrial gas turbine serving as an example to conduct an analysis, the operation data of the following three monitoring parameters were chosen as the sample input for the fault diagnostic model, namely, the opening degree of the gas valve, pressure difference of the gas valve and gas control pressure, and the three types of commonly seen fault were chosen as the output of the network, namely, gas pipeline leakage, clogging of the gas filter and fault of the gas valve.With the actual operation data serving as the sample of the network under the test, the actual operation fault of the gas turbine in question was tested.The test results show that the method under discussion can be used to effectively diagnose three typical faults of the fuel system and at the same time can support on-line diagnosis, thus meriting a relatively good application value for engineering projects. Source


Wang Y.-T.,Harbin Institute of Technology | Wu S.-H.,Harbin Institute of Technology | Chen M.,Csic Harbin No703 Research Institute | Wang J.-Z.,Csic Harbin No703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2011

Heat balance calculation is crucial for calculating the thermodynamic performance of a marine turbo-charged boiler. By performing an analysis and explanation in the light of the structural and operation features of a turbocharged boiler with its turbocharged unit doing work, the authors have proposed a method for calculating the heat balance and thermal loss of a marine turbocharged boiler with the heat absorbed by the air interlayer being taken into account, presented a formula for calculating the heat entered into the furnace and various losses, especially the thermal loss and heat isolation coefficient of the turbocharged unit and performed a thermodynamic check calculation of the turbocharged boiler with or without the influence of the air interlayer. The calculated results approximate to the actual conditions. The calculation method being proposed by the authors can provide reference for thermodynamic performance calculation of marine turbocharged boilers. Source


Zhang L.,Csic Harbin No703 Research Institute | Liu M.-Z.,Csic Harbin No703 Research Institute | He Z.-B.,Csic Harbin No703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014

By using the numerical simulation method, studied were the air diffusion combustion characteristics of a central air supply flue duct type firing device in a heat recovery steam generator. Under the operating condition of a fuel gas flow rate being 20 m3/h, a contrast of the numerical simulation results of the axial temperature distribution and NOx concentration distribution at the outlet with the test ones shows that they are in good agreement and proves that the calculation model is correct. The further calculation results indicate that with an increase of the excess air coefficient and the oxygen content of air or a decrease in air temperature, the maximum speed of the gas in the main stream will increase, however, the maximum speed area, speed attenuation characteristics of the main stream and the axial and radial distribution of CH4 component will change not big. When the air excess coefficient is low, the oxygen content is high and the air temperature is high, the flame will be of a “slender” type and to this contrary, the flame will be of a “stubby” type. When the air excess coefficient is low, the oxygen content is low and the air temperature is high, the temperature distribution of the flame will be more uniform. To increase the excess air coefficient and decrease the oxygen content and temperature of air can effectively reduce the NOx emissions at the outlet. In addition, the CO concentration is only relevant to the excess air coefficient (i. e. the air flow rate) but irrelevant to the oxygen content and the temperature of air. Source

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