Noise Reduction of Gas Turbine Unit Gas Paths by Lining Their Turns
DOI:
https://doi.org/10.24160/1993-6982-2023-1-93-99Keywords:
noise reduction, lined turn, gas turbine unitAbstract
Specific features of reducing the noise emitted from gas turbine unit (GTU) gas paths by lining their turns are analyzed. This problem is relevant for high-capacity GTUs when their gas paths cause exceeding of sanitary standards in the surrounding area. Methods for reducing the noise of gas paths by using various types of silencers are considered. One of the methods is to line the GTU exhaust path turns with sound-absorbing material. The noise suppression effect obtained from the lining of gas paths turns is compared with the effects obtained from using the known methods. It is shown that the lining of gas path turns allows the noise level to be additionally reduced while featuring the minimal pressure drop in comparison with that in using other silencers. A technical solution for reducing noise by lining for GTUs is given. The additional noise level reduction obtained in the case of lining the GTU gas path turn with sound-absorbing panels was up to 8 dBA. For the GTU exhaust paths in which the flow velocity in the gas conduits is 30–50 m/s at temperatures of 300–450°C, the efficiency decreases by 12–20%, respectively, for the above-mentioned velocity variation limits. To determine the pressure drop in turns of a complex shape, which are encountered in real GTU paths, mathematical simulation was used. For the problem considered, the simulation was carried out in the Solidworks Flow Simulation software, using which the pressure drop values were determined. Methods for additionally decreasing the pressure drop across the lined turn by fitting it with non-profiled blades were analyzed. It has been found that the installation of non-profiled blades in a direct turn makes it possible to reduce the turn pressure drop coefficient by 1.63–1.7 times in comparison with the original version and by 2.5–2.6 times in comparison with the lining without the use of blades. The effect the number of blades has on the turn pressure drop was studied. It has been shown that with increasing the number of blades from 3 to 4, the local pressure drop coefficient remains almost unchanged.
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Для цитирования: Тупов В.Б., Тараторин А.А., Скворцов В.С. Снижение шума газовых трактов газотурбинных установок облицовкой поворотов // Вестник МЭИ. 2023. № 1. С. 93—99. DOI: 10.24160/1993-6982-2023-1-93-99.
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For citation: Tupov V.B., Taratorin A.A., Skvortsov V.S. Noise Reduction of Gas Turbine Unit Gas Paths by Lining Their Turns. Bulletin of MPEI. 2023;1:93—99. (in Russian). DOI: 10.24160/1993-6982-2023-1-93-99.
