Investigation and modeling of thermal air convection and transport of local precipitation during winter operation of the service spillway at the Sayano-Shushenskaya HPP

Autor: V. V. Belikov, V. N. Koterov
Rok vydání: 2012
Předmět:
Zdroj: Power Technology and Engineering. 46:190-197
ISSN: 1570-1468
1570-145X
Popis: After the failure at the Sayano-Shushenskaya HPP, the need has arisen for prediction of winter operating conditions of the service spillway, since, it had previously not been placed in service at negative ambient temperatures. . For this purpose, coworkers of the JSC NIIES and the Computer Center at the Russian Academy of Sciences conducted a scientific-research study during the fall and winter of 2009 – 2010 on the subject “Prediction of the effect of the water-ice cloud in the air beyond the spillway of the Sayano-Shushenskaya HPP during the winter,” some results of which are presented in this paper. As we know, passage of water at the Sayano-Shushenskaya HPP with the generating sets idle occurred during the winter of 20092010 only over the service spillway, all 11 bays of which were operated at the minimum opening (half stage). Despite the fact that operation at half stage provided minimal aeration of the flow, and, as a consequence, minimum generation of water droplets in the toe basin and minimal transport of droplets and frozen mist to the crest of the dam by ascending air flows, this, everything being equal, led to the two following negative consequences: — rapid formation of thick ice layers on the faces of the spillway chutes and platforms adjacent to the toe basin (for example, on the crane trestle of the spillway dam (Fig. 1), and on the section of the separating abutment near the spillway; and, — formation and transport (Fig. 2) of solid precipitation (ice grit, snow), which are deposited on the more remote platforms (for example, on the balcony above the open section of the spillway, the crest of the dam, the roof of the machine room, etc.). These effects were observed in the period when the mean-daily air temperature in the region of the Sayano-Shushenskaya HPP had been consistently negative. The objective of this study was to evaluate by computational means (using both empirical relationships, and also mathematical modeling) the rate of ice formation and precipitation (liquid and solid) on platforms of the HPP (Fig. 1), for example, at the level of crane trestle of the spillway, where direct measurements were impossible.
Databáze: OpenAIRE
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