A Frequency Model of Vibrational Processes in Gas-Turbine Drives of Compressor Stations of Main Gas Pipelines

Chekardovskiy, M N; Chekardovskiy, S M; Razboynikov, A A; Ponomareva, T. G.

doi:10.1088/1757-899x/154/1/012023

Cited by 2 publications

(1 citation statement)

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“…The selected frequencies are corresponding to the values encountered in compressor sections of gas turbines. [28][29][30] The main flow and heated injection air temperatures are 297.65 K and 349.15 K, respectively. When the difference between the temperature of the injection air and the mainstream is large, the density ratio becomes an important parameter and its changes should be considered along with the changes of the blowing ratio.…”

Section: Strouhal Numbersmentioning

confidence: 99%

Effect of pulse injection on film cooling performance: Experimental and numerical investigation

Abadi

Zirak

Zargarabad

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, the influence of pulsating air on film cooling of a flat plate at different frequencies and blowing ratios are experimentally and numerically investigated. Square wave pulsed flow is generated at four frequencies of 2, 10, 50, and 100 Hz corresponding to Strouhal numbers of 0.00254, 0.0127, 0.0636, and 0.1271, respectively, and at five blowing ratios of 0.5, 1, 1.5, 2.4, and 3. Reynolds-averaged Navier−Stokes equations are resolved to analyze the coolant film effectiveness based on parameters set in the experiments. The [Formula: see text] model used for turbulent modeling. The obtained results showed that the performance of pulsating cooling decreases with increasing of blowing ratio at the same flow as steady state conditions. The difference between numerical and experimental values for the centerline film effectiveness shows good adaptation at the distances of the injection hole downstream. The lift-off of the local jet increased under pulsation. Increasing the pulse frequency increases the overall efficiency of film cooling. The maximum mean centerline pulsating film cooling effectiveness is obtained at Strouhal number of 0.0636 and a blowing ratio of 0.5, and the minimum value is for Strouhal number of 0.00254 and a blowing ratio of 3. For pulsed flow, the maximum discrepancy of the mean centerline film effectiveness between experimental and numerical results was 17.82%.

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Section: Strouhal Numbersmentioning

confidence: 99%