Numerical Simulation of the effect of passive control method by changing tip geometry on the performance of the axial turbine

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Abbasi Sarallah; Gholamalipour Afshin

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Journal: Modares Mechanical Engineering Year:2018 | Volume:18 | Issue:4 Page(s): 62-70

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Title

Numerical Simulation of the effect of passive control method by changing tip geometry on the performance of the axial turbine

Author(s)

Abbasi Sarallah | Gholamalipour Afshin | Issue Writer Certificate

Keywords

Axial turbineQ1

tip leakage flowQ1

passive controlQ1

numerical simulationQ1

Abstract

Turbine tip leakage flow is one of the effective factors in reducing the efficiency and performance of Axial turbines, which can also destroy turbine blades. Accordingly, it is important to identify and control the tip leakage flow. In this paper, the effect of tip clearance sizes and changes in tip shape as a passive control method on tip structure and total turbine flow performance is investigated. For this purpose, the flow loss in a two-stage Axial turbine is performed using the CFX software. In order to ensure the accuracy of the results, the turbine performance curves were compared with the experimental results which good consistency has been observed. Considering the four cases for tip clearance size (0. 5% to 3% of blade span), the turbine performance curves and pressure loss have been derived. It was found that increasing the tip clearance size leads to reduced efficiency and increased losses in the Axial turbine. In the following, we examine the application of the passive control method through the change of the tip geometry. In this regard, the shape of the blade tip is somehow considered that the tip clearance size is variable from leading edge to trailing edge. The results show that in these cases, tip leakage flow and the resulting vertices are weakened, which leads to a decrease in the rotor loss coefficient. Observing the flow contours results in lower temperatures in the blade region due to the formation of a weaker tip leakage flow, which helps cooling the turbine blades.

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APA: Copy

Abbasi, Sarallah, & Gholamalipour, Afshin. (2018). Numerical Simulation of the effect of passive control method by changing tip geometry on the performance of the axial turbine. MODARES MECHANICAL ENGINEERING, 18(4 ), 62-70. SID. https://sid.ir/paper/179492/en

Vancouver: Copy

Abbasi Sarallah, Gholamalipour Afshin. Numerical Simulation of the effect of passive control method by changing tip geometry on the performance of the axial turbine. MODARES MECHANICAL ENGINEERING[Internet]. 2018;18(4 ):62-70. Available from: https://sid.ir/paper/179492/en

IEEE: Copy

Sarallah Abbasi, and Afshin Gholamalipour, “Numerical Simulation of the effect of passive control method by changing tip geometry on the performance of the axial turbine,” MODARES MECHANICAL ENGINEERING, vol. 18, no. 4 , pp. 62–70, 2018, [Online]. Available: https://sid.ir/paper/179492/en

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