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Li T.,Harbin Institute of Technology | Bian X.,Harbin Institute of Technology | Huang H.-Y.,Harbin Institute of Technology | Ma H.-H.,Csic No703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014

Developed was a heat conduction solution-seeking program based on the three-dimensional non-structural grid. Through a contrast with the analytic solutions, it has been verified that the weighted least square method has a higher precision than the Green function method when seeking solutions to the gradient. The heat conduction program with a three-order precision based on the weighted least square method was coupled with the program HIT-3D for calculating the flow field in cascades to accomplish a gas-heat coupled calculation. The 5411 test conditions for MARKII blades were numerically simulated and with the help of the turbulent flow model available in the program HIT-3D, the influence of the transition on the heat transfer calculation was studied. It has been found that the temperature predicted by using the BL model has a greatest difference from the test value, being up to 10% at the transition point. As the software has an ability to simulate the transition, the temperature error in the transition zone calculated by using the BL+AGS transition model, SST-Gama model and q-ω model is relatively small, being around 5%. It can be seen that the turbulent flow models with the transition being taken into account can better predict the temperature on turbine blades. Source


Zhang K.,Csic No703 Research Institute | Li Y.-S.,Csic No703 Research Institute | Zheng B.-L.,Tongji University
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2010

For a large-sized high-speed gear rotor system, mass non-equilibrium may produce a periodic centrifugal inertia force and cause vibrations to the system, affecting its strength and service life. Based on MSC.ADAMS, a bowed and twisted coupled vibration model for a gear system was established with two circumstances being taken into account, namely, engagement type coupling and rotor dynamic type one. The gears were processed as a rigid body while the shaft was treated as a flexible one. By adopting a multiple flexible body kinetics analytic method, a numerical simulation was performed and the dynamic excitation forces of the gears and the whirling trajectory of the gear centers under the condition of rotor whirling caused by the normal engagement and mass non-equilibrium of the gears were obtained. On this basis, an analysis and comparison was made to provide an underlying basis for the kinetic analysis of the gear box. A finite element model for such a purpose was established in MSC.Patran. By utilizing MSC.Nastran, a transient kinetic analysis was performed of the gear box, and the vibration characteristics of the box body under two eddy whirling operating conditions caused by the normal engagement and mass non-equilibrium of the gears were obtained respectively. Source


Tan Z.-Y.,Harbin Engineering University | Han Q.,Csic No703 Research Institute | Zheng H.-T.,Harbin Engineering University | Li Q.,Csic No703 Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2010

The chemical recuperative cycle represents an advanced gas turbine-based one. To systematically study its thermodynamic performance, established was an entropy-temperature diagram for the above cycle based on a thermodynamic analysis of the cyclic process, and defined was a relative growth rate of the heating value of the fuel. Moreover, a mathematical expression for the thermal efficiency of the cycle was derived along with an analysis and calculation of the cyclic performance. It has been found that the chemical recuperative cycle features a relatively high efficiency and its maximal value can be over 55%. The optimum pressure ratio of the cycle in question depends on the optimum pressure ratio of the gas turbine-based simple cycle. Hence, the chemical recuperative cycle can be regarded as one, not restricted by the pressure ratio. The depth of the fuel-steam conversion in the chemical recuperative cycle is relatively heavily affected by the exhaust gas temperature. The lower the exhaust gas temperature, the less the growth rate of the heating value of the fuel. Source


Xu N.,Csic No703 Research Institute | Wang X.,Csic No703 Research Institute | Zhang M.,Harbin Institute of Technology | Xu F.-C.,Harbin Institute of Technology
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2012

By using the pulsation excitation method, studied was the law governing the influence of the structural parameters of an excruded oil film damper in a marine gas turbine on its damping characteristics. The research results show that the effective length and the oil film radius clearance of the damper have a remarkable influence on the damping characteristics. However, when the eccentricity is in a range of 0-0.3, such an influence is not big. Furthermore, the tiny bubbles and noise signals in the oil film during the test process have certain influence on the test results while the pulsation excitation has little influence. In the meantime, the feasibility of the present test and study scheme was also verified. Source


Zhang L.,Csic No703 Research Institute | Liu M.-Z.,Csic No703 Research Institute | Zhang D.,Harbin Institute of Technology
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2013

A numerical simulation study was performed in detail of the flow characteristics of the tangentially fixed blade type swirling burners in a supercharged boiler and the simulation results under the normal temperature and pressure condition were compared with the flow resistance value in the test and the boundary of the central return flow zone provided in the literature No. 11, thus it is verified that the calculation model chosen by the authors is correct. It has been found by analyzing the calculation results of the return flow zone distribution at various air inlet widths, velocity distribution and resistance coefficient under the pressure boosting condition that when the geometrical dimensions are similar and other structural parameters are kept unchanged, the air inlet width will assume a single-value corresponding relationship. When the diffusion angle at the air outlet is constant and the swirling intensity is between 1 and 1.35, a central return flow zone will be formed and favorable to the ignition of the fuel and the stability of the combustion. With an increase of the air inlet width, the uniformity of the air distribution will get worse, the maximum axial return flow speed (absolute value) in the central return flow zone will become smaller, the maximum axial speed in the main flow zone will become bigger, the axial speeds in various sections along the flow direction will totally assume a "M"-shaped distribution, the tangential speeds will all take on a "N"-shaped distribution, the resistance coefficient will exhibit a good positive proportional relationship with the swirling flow intensity. The foregoing is identical to those given by the literature No.15, further proving that the calculation model chosen by the authors is rational. Source

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