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Modernisation of the last stage in the low- pressure cylinder of a steam turbine using CFD and optimisation techniques

Rusanov A. V., Paschenko N. V., Yakovlev V. A., Yershov S. V.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2008

nr 133

291--298

The results of gas dynamic improvement of the last stage in the low-pressure cylinder of a steam turbine are presented. The turbine stage performance and the 3D flow patterns were obtained with the CFD solver FlowER. Stage modernisation was carried out in two ways. First, stage blade sections were renovated, and then the 3D blade shape was optimised using the CFD and optimisation techniques. The optimised stage has stator blades with a compound lean at the hub and a compound sweep at the tip. The efficiency of the improved stage is higher by roughly 2 percent at nominal flow conditions and is up to 10 percent for low flow rate conditions as compared to that of the original stage.

Cryoadsorption as universal route to dihydrogens of high and ultrahigh individual purity

Parbuzin V. S., Yakovlev V. A., Lukyanov A. A., Leshchev Y. A.

Ars Separatoria Acta

2003

No. 2

84-96

The paper describes a new efficient cryoadsorptive method of dihydrogens p-H2, o-H2, HD, o-D2, p-D2, HT, DT, T2 separation with moving temperature gradient on the adsorbent fixed bed. The method was developed at the Department of Chemistry, Moscow State University, as a result of many years’ experimental and theoretical investigations. The separation method, and corresponding periodical action apparatus named MTGA (Moving Temperature Gradient Adsorption), and MGU DETRA (Multispecious Gas Separator-Upgrader: DEuterium, TRitium, Adsorption), respectively, are applied to prepare individual dihydrogens in very pure isotopic or nuclear-spin forms. In this paper, the basic design and possibilities of a typical three – stage laboratory adsorption separative cascade are given. The cascade was used to prepare two gases of ultrahigh isotopic purity (99.9998 mol.% deuterium and 99.98 mol.% deuterium hydride HD) for the first time. Moreover, the paper presents the results of successful studies on enriching microquantities of tritium-containing molecules HT, DT, T2 from macrocomponents H2 and D2.