A progressive optimization for the inverse design of blade profile based on sequential quadratic programming

Xiao, Nan; Liu, B; Jin, Jianmin

doi:10.1243/0954406jmes387

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…Inlet flow conditions have an important impact for boundary layer on its development, separation and transition [5][6]. Along history, wind tunnel experiment is always an important method for research.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Boundary Layer Characteristics on Blade Surface under Different Inlet Flow Conditions

Bo¹,

Liu²,

Zhao³

et al. 2010

EPE

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In this paper, an experimental study is conducted on cascade boundary layer under different inlet conditions. New method is used to measure the total pressure in blade surface boundary layer directly using total pressure probe. Total pressure in both suction and pressure surfaces are acquired at different inlet conditions by changing incidence angle and inlet Mach number. In addition, a series of parameters related to boundary layer characteristics are calculated. The objective of the experiment is to investigate the influence of inlet flow conditions on them. The results indicate that influence of incidence angle is significant when other conditions are the same. Displacement thickness, momentum thickness as well as other parameters display some disciplines for variation. In contrast, inlet Mach number has only a small influence in that boundary layer becomes a litter thinner with increasing Mach number. Comparisons of experimental results with theoretical expectations demonstrate that the method in this experiment is effective and reliable.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Boundary Layer Characteristics on Blade Surface under Different Inlet Flow Conditions

Bo¹,

Liu²,

Zhao³

et al. 2010

EPE

View full text Add to dashboard Cite

show abstract

Numerical simulation of rail surface-initiated rolling contact fatigue in the switch panel of railway turnouts

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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Considering the complex characteristics of the track structure in railway turnouts, it is difficult and also expensive to experimentally study rail damages; therefore, numerical methods are an effective alternative. This study presents a numerical method to simulate rail surface-initiated rolling contact fatigue in the switch panel of railway turnouts. This method includes simulation of the vehicle–turnout wheel–rail dynamic interaction, analysis of the wheel–rail multipoint non-Hertzian rolling contact that considers the relative motion between the switch and stock rails, and calculation of the accumulated rail surface-initiated rolling contact fatigue. The accumulated rail surface-initiated rolling contact fatigue after the vehicles passed a turnout switch panel 80 times (the average number of vehicles running on the Chinese high-speed railway lines per day) in the through route with facing move was simulated based on this procedure. The result showed that the maximum surface-initiated rolling contact fatigue damage of the switch rail and the stock rail was 1.57 × 10−2 and 0.62 × 10−2, respectively. Surface-initiated rolling contact fatigue in the switch rail mainly occurred at the gauge angle, and in the stock rail it mainly occurred at the center of the rail. In addition, the influence of track parameters (rail inclination, track gauge, and friction coefficient) is analyzed. The friction coefficient influenced the rail surface-initiated rolling contact fatigue. When the coefficient exceeded 0.3 in particular, the rail rolling contact fatigue damage increased sharply. Hence, suitable friction control measures should be taken during rail maintenance in order to mitigate the rail surface-initiated rolling contact fatigue damage, e.g. by keeping the wheel–rail friction coefficient below 0.3.

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A progressive optimization for the inverse design of blade profile based on sequential quadratic programming

Cited by 2 publications

References 15 publications

Experimental Investigation of Boundary Layer Characteristics on Blade Surface under Different Inlet Flow Conditions

Experimental Investigation of Boundary Layer Characteristics on Blade Surface under Different Inlet Flow Conditions

Numerical simulation of rail surface-initiated rolling contact fatigue in the switch panel of railway turnouts

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