Calculation and experimental research of influence of vapor ionization on the parameters of wet steam flow in supersonic nozzle

• Main Authors: Тарелин, А. А., Орловский, В. П., Ковалев, А. С., Нечаев, А. В.
• Format: Article
• Language: Russian
• Published: Journal of Mechanical Engineering 2016
• Subjects: steam turbine; mathematical model; ionization; nonequilibrium; condensation jump; experimental test bench; efficiency; УДК 621.165; 51.380; паровая турбина; математическая модель; ионизация; неравновесность; скачок конденсации; экспериментальный стенд; КПД; парова турбіна; математична модель; іонізація; нерівноважність; стрибок конденсації; експериментальний стенд; коефіцієнт корисної дії
• Online Access: https://journals.uran.ua/jme/article/view/71843

The main features of the developed mathematical model and program complex designed on its basis that allows calculating the parameters of no equilibrium vapor condensation for the channels of adjusted geometry, taking into account volume condensation on both homogeneous and heterogeneous embryos are studied. It was found that the change in absolute values of the pressures along the flow of the nozzle obtained by calculation is in good coincidence with the experimental data. It is stated that a number of experimental studies to determine the effect of heterogeneous condensation nuclei obtained by ionization of vapor on the steam flow parameters in supersonic nozzles are carried out for the first time. For this purpose experimental bench with different capacity of steam generators were created; vapor ionizers of corona and barrier type were designed; convergent-diffuser supersonic nozzles with different Mach numbers were designed and manufactured. The possibility of reducing losses from hypothermia and condensation jumps by vapor ionization that can help to improve the efficiency and compartment’s power of wet steam stages of full-scale turbines is shown. It is found that the ionization efficiency of the steam is higher when pressure is higher and steam temperature is closer to its saturation line