Effect of Rear Baffle Structure on Leakage Characteristics and Temperature Distribution of Finger Seals
In order to study the leakage characteristics and temperature distribution in finger seals with different rear baffle structures,the sealing area of the finger seals was treated as a porous medium model,four kinds calculation models were established,including standard,pressure balance,through-cavity and wing finger seals.Computational fluid dynamics was used to solve the models,and the hysteresis effect,leakage characteristics and temperature distribution of the finger seals with different rear baffle structures was studied at different differential pressures and rotational speeds.The results show that the hysteresis effect of standard and pressure balance finger seals is similar,while the hysteresis effect of through-cavity and wing finger seals is lower than that of standard and pressure balance finger seals.The pressure difference has the greatest impact on the leakage of the through-cavity finger seal,and the smallest impact on the leakage of the standard fin-ger seal.The rotational speed has the greatest impact on the standard finger seal,and the least impact on the wing finger seal.At the same pressure difference and rotational speed,the standard finger seal has the highest maximum temperature,while the wing finger seal has the lowest maximum temperature,indicating that frictional heat has the least impact on the wing finger seal.Research shows that the wing finger seal has a similar hysteresis effect to the through-cavity seal,but its leakage rate is lower than that of the through-cavity seal,and the wing finger seal has a longer service life at the same pressure difference and speed.The research results are of some guiding significance for the optimization design of fingertip seals.
rear baffle structureporous mediumhysteresis effectleakage characteristicstemperature distribution
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