Influence of Leaned Blade Leading Edge on Forced Response of Turbine

HUANG Zhi; MA Chaochen

doi:10.3969/j.issn.1001-2222.2023.03.004

Vehicle Engine ›› 2023, Vol. 0 ›› Issue (3) : 22-27. DOI: 10.3969/j.issn.1001-2222.2023.03.004

Influence of Leaned Blade Leading Edge on Forced Response of Turbine

HUANG Zhi^1，2，MA Chaochen²

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Abstract

Aiming at the problem of easy occurrence of high-cycle fatigue failure in the radial flow turbine of a vehicle turbocharger during operation, the fluid-solid coupling method was used to compare and analyze the internal flow field and forced response of turbine with different leaned leading edge of impeller. The results show that a certain leaned angle between the leading edge of blade and the trailing edge of the guide vane can reduce the rotor-stator interference. The passage vortices of leaned leading edge impeller near the blade pressure side are stronger than those of the vertical leading edge model, resulting in the decrease of turbine efficiency. The vertical design of blade cuts with the wake of guide vane at the same time in the entire blade height range, which increases aerodynamic excitation, and the leaned leading edge of blade can reduce the wake interference. In addition, the suction side pressure of leaned leading edge model is smaller than that of the vertical leading edge model, and the potential field of guide vane has a stronger interference effect on the vertical leading edge impeller. Considering the influence of the leaned angle on the efficiency and the maximum dynamic stress, a reasonable leaned angle is obtained, and hence the maximum dynamic stress of impeller decreases considerably under the first-order and second-order harmonic pressures.

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/ mso-hansi-font-family: 宋体">vehicle turbocharger;radial turbine;blade;forced response

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HUANG Zhi，MA Chaochen. Influence of Leaned Blade Leading Edge on Forced Response of Turbine[J]. Vehicle Engine. 2023, 0(3): 22-27 https://doi.org/10.3969/j.issn.1001-2222.2023.03.004