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RISS 인기검색어
- 검색키워드
- 저자 : Linqi Liu (검색결과 3 건)
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The effect of cooling conditions on convective heat transfer and flow in a steam-cooled ribbed duct
Linqi Shui,Jianmin Gao,Xiaojun Shi,Jiazeng Liu,Liang Xu 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1
This work presents a numerical and experimental investigation on the heat transfer and turbulent flow of cooling steam in a rectangularduct with 90° ribs and studies the effect of cooling conditions on the heat transfer augmentation of steam. In the calculation, the variationrange of Reynolds is from 10,000 to 190,000, the inlet temperature varies from 300°C to 500°C and the outlet pressure is from 0.5MPa to6MPa. The aforementioned wide ranges of flow parameters cover the actual operating condition of coolant used in the gas turbine blades. The computations are carried with four turbulence models (the standard k-ε, the renormalized group (RNG) k-ε, the Launder-Reece-Rodi(LRR) and the Speziale-Sarkar-Gatski (SSG) turbulence models). The comparison of numerical and experimental results reveals that theSSG turbulence model is suitable for steam flow in the ribbed duct. Therefore, adopting the conjugate calculation technique, further studyon the steam heat transfer and flow characteristics is performed with SSG turbulence model. The results show that the variation of coolingcondition strongly impacts the forced convection heat transfer of steam in the ribbed duct. The cooling supply condition of a relativelow temperature and medium pressure could bring a considerable advantage on steam thermal enhancement. In addition, comparing theheat transfer level between steam flow and air flow, the performance advantage of using steam is also influenced by the cooling supplycondition. Changing Reynolds number has little effect on the performance superiority of steam cooling. Increasing pressure wouldstrengthen the advantage, but increasing temperature gives an opposite result.
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Yongzhi Wang,Mengbo Liu,Shaoming Liao,Qiong Yi,Junzuo He,Linqi Liu,Zhiqun Gong,Kaiying Li 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.5
Press-in open caisson method, which sinks into soil with the aid of mechanical pressure without excavation, is becoming an important method of construction in extremely soft foundations. However, many engineering problems are prone to occur in the construction of caissons, such as sinking and large deformation. In this study, the stratigraphic response model, such as soil migration during the press-in process of open caisson, is focused on. Through model tests of soil and caissons, the migration patterns of each part of the soil were carried out, and the mechanism underlying the stratigraphic response pattern was investigated. The three primary conclusions are as follows: 1) The bottom edge foot of caisson produces lateral extrusion on surrounding soil in the range of 10 cm (20%H) below, resulting in lateral movement of soil. 2) two kinds of plug, i.e., “wedged” and “unwedged” plugs exist, and the driven forces for the soil migration can be divided into three stages, i.e., caused by soil plug with active arch, by soil plug with passive arch and caused by soil squeezing effect. 3) there is a significant linear correlation between the soil plug changes, the horizontal movement of the deep soil body, and the displacement of the surface uplift. The soil plugging effect and squeezing effect are interacted and enhanced with each other. This study provides a new understanding of the stratigraphic response in the construction of press-in open caissons, andguides safety control of open caissons construction.
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Solution Method and Application Verification of the K-curve as a Highway Transition Curve
Bing-hong Pan,Changpeng Wen,Kaiming Wang,Changjiang Liu,Linqi Chen 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.7
Because of the singular form and low flexibility of the clothoid as a highway transition curve in highway horizontal alignment, the K-curve, whose ratio of the chord-tangent angle to the tangential angle at any point is fixed, was proposed in a previous work, including the corresponding parametric equations and basic characteristics, and its high flexibility and various shapes were proved. Here, the application and verification of the K-curve in highway alignment is further studied. The solution methods of the K-curve for different connections are given. Through theoretical calculations and specific real-world examples, the geometric positions and lateral forces of the K-curve and the clothoid under different connection conditions are compared. The results show that the difference between the K-curve and clothoid in the above two aspects under a straight line-to-circle connection is greater than that under a circle-to-circle connection as an egg curve, and although the lateral force coefficient of the K-curve is smaller than that of the clothoid, the K-curve suffers from rapid change in the lateral force coefficient and a higher lateral acceleration change rate. Finally, the application conditions of the K-curve for highway alignment design are given with consideration of the centrifugal acceleration change rate.
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