Development of a method for accelerated assessment of the relative gain in the input technical work in the compression process and the polytropic index of the final parameters in a piston compressor with a two-phase working fluid

The paper proposes a method in determining a relative gain in the technical work supplied during the compression process and the polytropic index of the final parameters of the two-phase working fluid compression process using a simplified method based on applying the interpolation polynomials constructed for the multidimensional space. It is determined by the main independent variables that are significantly influencing the objective functions: relative number and average radius of the injected liquid droplets, injection pressure and the crankshaft speed. The constructed regression polynomials of the first and second order are describing alteration in the objective functions quite well depending on the independent variables. For the first-order polynomial, standard deviation is 2.0 ... 2.6 %, for the second-order polynomial — 1.0 %. The obtained polynomials could be used in both the research purposes and practice.
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