Interpolation-analytical method of taking into account real properties of gases and fluids

Authors

  • Андрей Викторович Русанов Institute of Problems of Mechanical Engineering A.N. Podgorny NAS Str. Dm. Pozharsky 2/10, Kharkov, Ukraine, 61046, Ukraine

DOI:

https://doi.org/10.15587/1729-4061.2013.14864

Keywords:

interpolation-analytical method, approximation of equations, gas dynamic processes, turbine setting

Abstract

The article proposed the interpolation-analytical method of taking into account the actual properties of working fluids in calculation of three-dimensional gas-dynamic processes. The method is based on the approximation of the complex thermodynamic functions by simpler dependencies. These dependencies are the equation of state of a perfect gas with variable coefficients of compressibility. The variables of compressibility are calculated with the help of interpolation third-order polynomials on arrays of thermodynamic values obtained with more complex equations of state, such as the modified equation of state of Benedict-Webb-Rubin. This approach provides sufficient accuracy of the thermodynamic values in the whole range of work of modern and advanced steam turbines (maximum error does not exceed ± 0,1%), but it does not require a significant increase in computational cost. It was shown that this method provides more accurate calculation of the flow in a five-stage low-pressure cylinder of the steam turbine with the experimental data compared to calculations that use simple equations of state. 

Author Biography

Андрей Викторович Русанов, Institute of Problems of Mechanical Engineering A.N. Podgorny NAS Str. Dm. Pozharsky 2/10, Kharkov, Ukraine, 61046

Doctor of Technical Sciences

Deputy Director for Science, Department Head in hydro power machines

References

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Published

2013-06-19

How to Cite

Русанов, А. В. (2013). Interpolation-analytical method of taking into account real properties of gases and fluids. Eastern-European Journal of Enterprise Technologies, 3(10(63), 53–57. https://doi.org/10.15587/1729-4061.2013.14864

Issue

Vol. 3 No. 10(63) (2013): APPLIED INFORMATION TECHNOLOGY

Section

Industry control systems

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Copyright (c) 2014 Андрей Викторович Русанов

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