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Application of innovative solutions to improve the efficiency of the LPC flow part of the 220 MW NPP steam turbine

Rusanov Andrii, Subotin Viktor, Shvetsov Viktor, Rusanov Roman, Palkov Serhii, Palkov Ihor, Chugay Marina

Archives of Thermodynamics

2022

Vol. 43, no 1

63--87

The results of the gas-dynamic calculation of the low-pressure cylinder flow part of the K-220-44 type steam turbine intended for operation at nuclear power plants are presented. The ways of the flow part improvement were determined. Some of those ways include the use of innovative approaches that were not previously used in steam turbines. The design of the new flow part was carried out on the basis of a comprehensive methodology implemented in the IPMFlow software package. The methodology includes gas-dynamic calculations of various levels of complexity, as well as methods for analytical construction of the spatial shape of the blade tracts based on a limited number of parameterized values. The real thermodynamic properties of water and steam were taken into account in 3D calculations of turbulent flows. At the final step, end-to-end 3D calculations of the lowpressure cylinder that consists of 5 stages were performed. The technology of parallel computing was applied in those calculations. It is shown that due to the application of innovative solutions, a significant increase in efficiency can be achieved in the developed low-pressure cylinder.

A Computational Investigation of a Novel Explosive: DNTF

Zhang Ch., Shu Y., Wang X., Wu X., Zhao X.

Central European Journal of Energetic Materials

2005

Vol. 2, nr 2

45-53

Computational investigation including molecular structure, crystal density, heat of formation, relative specific impulse, heat of detonation, detonation velocity and pressure on dinitrofurazanfuroxan (DNTF) was performed by quantum chemistry (density functional theory and Beck 3LYP hybrid density functional with 6-31G (d, p) basis set), molecular mechanics (Dreiding forcefield) and Monte Carlo methods. It can be deduced that DNTF is moderately sensitive and the N9-O10 bond is the weakest in the molecule and the trigger spot of decomposition by the molecular structure analyses. The mean values of the computational results of DNTF are: heats of formation of gas (HOF) and crystal state - 1113.8 and 992.5 kJ mol-1 respectively; heat of detonation (HOD) - 7119.0 kJ kg-1; relative specific impulse vs. HMX - 1.135; detonation velocity and pressure - 9.10 km s-1 and 38.3 GPa respectively. As a result, DNTF is more powerful than HMX and is a promising melt-cast explosive for its possessing high power, moderate sensitivity, low melting point and thermal stability. Additionally, the simulation data is consistent with experiment. So these methods can also be applied to other HEDM (high energetic density materials) designs.