نوع مقاله : مقاله پژوهشی
نویسندگان
گروه آموزشی آیرودینامیک، مجتمع دانشگاهی هوافضا، دانشگاه صنعتی مالک اشتر، تهران، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Entropy serves as a key parameter in achieving the theoretical limits of performance and quality in many engineering applications. In this paper, the three-dimensional analysis of entropy generation, local entropy generation and exergy destruction of turbine stator vane by udf code has been done. The current innovation is to measure the exergy destruction rate of the turbine three-dimensional vane with the help of FLUENT. The k-ω (SST) and Spalart-Allmaras models are suitable for prediction of proper effective viscous and thermal conductivity. Due to the sensitivity to the vane tip and the wake flows, k-ω (SST) model obtained the mean value of entropy generation on the reference line by about 85% more than the Spalart-Allmaras model. Local entropy generation has increased with respect to the scale from the root to the tip of the vane. The difference between the values of local entropy generation and the second law of thermodynamic for k-ω (SST) and Spalart-Allmaras models are 7.4% and 10.2%, respectively. Approximate turbulence coefficients have been introduced with the aid of a custom field function that increases the local entropy generation about 130% on the reference line. The k-ω (SST) model calculated the exergy destruction value of a turbine stage (according to Gouy-Stodola theorem) of 1098 kW, which is 4 times the size of the two-dimensional mode due to the scale. The values of local entropy generation calculated in comparison with the stator vane of the turbine of the authentic paper are validated, which has acceptable adaptation.
کلیدواژهها [English]
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