Csic Harbin No703 Research Institute

Harbin, China

Csic Harbin No703 Research Institute

Harbin, China
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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.


Xu N.,Harbin Institute of Technology | Xu N.,Csic Harbin No703 Research Institute | Wang Q.,Harbin Institute of Technology | Liu Z.,Harbin Institute of Technology | Yang F.,Harbin Institute of Technology
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2016

Thermal stress is one of the most important parameters in turbine rotors undergoing transient thermal impact, and it directly influences the safety and life of turbine rotors. Based on thermoelastic coupling derivation and finite element simulation, we analyzed the two types of typical turbine rotor structures undergoing transient thermal impact and investigated the transient thermal stress, temperature distributions, and resulting rule changes of the rotor structure parameters. In addition, to better understand the asymmetric thermal impact phenomenon of the turbine rotor when in operation, we investigated the heat conduction of the turbine rotor while undergoing circumferential asymmetric thermal impact. The results show that transient thermal stress on the turbine rotor is greater than the steady state thermal stress, and the rotor is affected by the corner radius, disk thickness, and disk to shaft ratio. These results could be used as a reference in early design stage for estimating the thermal fatigue life of a turbine rotor. © 2016, Editorial Department of Journal of HEU. All right reserved.


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.


Kang L.,Csic Harbin No703 Research Institute | Zhang X.-F.,Csic Harbin No703 Research Institute | Wang C.,Csic Harbin No703 Research Institute | Luo X.-M.,Harbin Steam Turbine Works
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014

Marine steam turbines are characterized by their multiple operating conditions and variable rotating speeds etc. actual operating peculiarities. The authors have performed an aerodynamic optimization of the long blades in the last stage of a low pressure steam turbine under the multi-operating conditions by using a numerical simulation method and a contrast and analysis of the overall performance and loss coefficients of the prototype blade, retrofitted blade and bent blade under two operating conditions. The research results show that the retrofitted blade and bent blade can make the reaction of the blade along the blade height be more uniform and through the optimization, the attack angle values along the blade height under the off-design operating conditions are smaller, thus enhancing the efficiency by 0.5%-1% at the rated load while heightening the economic performance under the low load operating conditions far more than those above-mentioned. The retrofitted blade and rear-loaded blade can enhance the performance under the off-design operating conditions by around 4% and 7%, thus attaining the original intention: under the precondition that the efficiency at the rated load is not becoming lower, the economic performance under the low load operating conditions can enhance by a large margin.


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.


Ji G.-M.,Csic Harbin No703 Research Institute | Wu Q.,Csic Harbin No703 Research Institute | Wang C.,Csic Harbin No703 Research Institute | Wu Y.,Csic Harbin No703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2011

Analyzed was the current status concerning applications of gas turbines in natural gas pump units (GPU). It is noted that gas turbines constitute the key equipment items for realizing applications of long distance gas and oil transmission technologies. Around such applications, some imaginations and suggestions were given for China to develop and apply them in gas turbines and establish Chinas own gas turbine industry. It is also pointed out that industrial/marine gas turbines should be developed by tightly focusing on the demands of China, the principles of starting from a high start point, one machine for multiple purposes and wide applications, followed, and a proper power grade for the unit under development for applications, carefully chosen. The adoption of a generalization design can achieve multiple purposes. The use of an "Aquarius" device together with a COGAS one in a gas turbine-driven compressor set/pump group can attain the aim of enhancing both the power output and efficiency.


Cheng D.-M.,Csic Harbin No703 Research Institute | Chen M.,Csic Harbin No703 Research Institute | Ji Q.-Z.,Csic Harbin No703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014

Boiler steel-made smoke stacks pertain to high-rise structures and the wind load calculation plays a key role in structural design. In the light of the differences existing in American and Chinese specification for steel-made smoke stacks, the basic wind speed, along-the-wind-direction wind load calculation and lateral wind vibration were compared and analyzed. With two engineering projects serving as examples, their wind load calculation results were compared. It has been found that the basic wind speeds stipulated in the specifications of both countries cannot be used at a same time and a conversion is needed, and the conversion factor of 1.45 is considered as relatively sound and reasonable. The along-the-wind-direction wind load as calculated as per this conversion factor is basically identical to that as calculated as per the other specification. For a same engineering project, the lateral wind vibration results judged by using the specifications of both countries may be different and the wind load design value of the structure may also be not identical. To guarantee the safety of foreign-related projects, the structure should meet all relevant requirements stipulated in American and Chinese standards.


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, reviewed was the influence of the root air on the air flow characteristics of a fuel oil swirling burner thus designed under the supercharging condition. By analyzing the corresponding returning flow zone distribution, velocity distribution and resistance characteristics etc. in various flow areas for the root air, the authors concluded that for the swirling burner under discussion, the influence of the root air on the supercharged air flow characteristics mainly reflects the magnitude of the air quantity passing through the root, i.e. the opening area of the combustion stabilizer and is irrelevant to the mode for drilling holes and the diameter of a single hole. Among them, the ratio of the area of the holes and the surface area of the combustion stabilizer f/F=0.18 was regarded as the optimum parameter. The axial speed distribution on various representative sections corresponding to the various areas of the flow path for the root air all assumed a shape of "M"while the tangential speed distribution took a shape of "N". When f/F=0, the location of the stagnation point in the central returning flow zone lagged behind by 0.17 as compared with those when f/F=0.18 and f/F=0.36.When f/F=0.54, there existed no stagnation point in the central returning flow zone. The resistance loss occurred during the air flowing through the locations of the blades and the combustion stabilizer occupied a highest proportion of the total resistance loss. Both the total flow resistance and the area of the flow path for the root air assumed a monotone descending linear relationship. The relative error of the resistance coefficient between the calculated value and the test one was invariably lower than 2%, further proving that the calculation model thus chosen is rational.


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.


Wu P.,Csic Harbin No703 Research Institute | Cao T.-Z.,Csic Harbin No703 Research Institute | Zhang C.-X.,Csic Harbin No703 Research Institute | Li M.-J.,Csic Harbin No703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2015

To make a gas turbine to meet the requirements for pollutant emissions, one must perform an optimized design of the structure of its combustor. At present, all the world-advanced low emission combustors adopt the dry type fuel deficiency premixed combustion technology, the key measure of which is to control the premixed uniformity of fuel in the combustion zone, the more uniform the fuel premixed, the less the high temperature zones in locals and the less the NOxproduced. For a dry type premixed combustor, the structure of its swirler exercises important influence on the uniformity of fuel premixed. Therefore, the authors mainly studied the structure of the swirler in the combustor of a gas turbine, analyzed the influence of the swirling direction, swirling number, fuel and air momentum ratio of the swirler on the NOx emissions and then looked for the optimized structure of the swirler. It has been found that the optimized swirler should be one with two stages combined along the same direction, the swirling number in the second stage should be 0.7, the fuel and air momentum ratio 0.058, the amount of NOx emissions at the outlet of the combustor 16.6 mg/m3, the total pressure loss coefficient 5.96% and the maximum non-uniformity of the temperature at the outlet 9.6%. ©, 2015, Harbin Research Institute. All right reserved.

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