Rotor-bearing dynamic research on an E-type gas turbine-generator set
In this paper, every rotor in the shafting of an E-type gas turbine-generator set is simplified for numerical simulation. Finite element analysis on lateral critical speed, unbalance response and stability is carried out systematically. The simplified model and the conclusions would provide a reference for designing another similar type gas turbine-generator set.
Investigation on the Vibration Characteristics of the Shafting for a Gas-steam Combined Cycle Units
In this paper,the vibration characteristics of the shafting for a gas-steam combined cycle Units were studied.First,rotors were modeled,then the bending critical speeds and unbalance response of the shafting system were calculated by finite element model.The torsional vibration natural frequencies and two-phase short circuit response of the shafting were calculated by transfer matrix method at the same time.Finally the shafting vibration safety was also analysed.
Effects of reservoir volume on performance of pulse tube cooler.
A pulse tube cooler has the advantages of long-life and low-vibration over conventional cryocoolers such as G-M and Stirling coolers because of the absence of moving parts at low temperature. On the other hand, the combination of a reservoir and orifice is indispensable to optimize the performance of pulse tube coolers. In order to make the pulse tube cooler compact for practical applications, the volume of reservoir should be minimized. This paper analyzes the effects of the reservoir volume on the thermodynamic performance of various components in a simple orifice and a double-inlet pulse tube cooler by combining a linearized model with a thermodynamic analysis. Expressions of entropy production for those components are presented. The results show that the reservoir volume has a significant influence on the entropy production in the various components when the reservoir to pulse tube volume ratio is smaller than about 5. The ratio is important to determine the minimum reservoir volume for a pulse tube cooler. Optimum settings for a double-inlet pulse tube cooler are also discussed.