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- 저자 : Penghui Qiu (검색결과 2 건)
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Water film covering characteristic on horizontal fuel rod under impinging cooling condition
Zhang Penghui,Wang Bowei,Chen Ronghua,Su G.H.,Tian Wenxi,Qiu Suizheng 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11
Jet impinging device is designed for decay heat removal on horizontal fuel rods in a low temperature heating reactor. An experimental system with a fuel rod simulator is established and experiments are performed to evaluate water film covering capacity, within 0.0287e0.0444 kg/ms mass flow rate, 0 e164.1 kW/m2 heating flux and 13.8e91.4C feeding water temperature. An effective method to obtain the film coverage rate by infrared equipment is proposed. Water film flowing patterns are recoded and the film coverage rates at different circumference angles are measured. It is found the film coverage rate decreases with heating flux during single-phase convection, while increases after onset of nucleate boiling. Besides, film coverage rate is found affected by Marangoni effect and film accelerating effect, and surface wetting is significantly facilitated by bubble behavior. Based on the observed phenomenon and physical mechanism, dry-out depth and initial dry-out rate are proposed to evaluate film covering potential on a heating surface. A model to predict film coverage rate is proposed based on the data. The findings would have reliable guide and important implications for further evaluation and design of decay heat removal system of new reactors, and could be helpful for passive containment cooling research.
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Bolt Loosening Localization at Flange Joints Using Wind-Induced Response for High-Rise Tower
Baifeng Ji,Qian Xiong,Panpan Xing,Penghui Qiu,Wei-lian Qu 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5
Under long term wind load, the bolt looseness occurring at the joints of tower legs will reduce the wind-resistant capability, increasing the wind-induced displacement responses and aff ecting the serviceability of the high-rise steel tower. In order to detect the bolt looseness locations of the fl ange assembling joints of leg members in high-rise steel tubular tower structures, a new bolt loosening localization at fl ange joints method using wind-induced response for high-rise tower was presented in this paper. Wind-induced vertical strain response root variance of fl ange assembling joint on the tower vertical bar is defi ned as the identifi cation parameter of the bolt looseness damage. Then, the normalized wind-induced vertical strain response root variance is defi ned as the damage index of bolt loose-ness damage, thereby eliminating the impact of wind loads of diff erent magnitudes on damage identifi cation. When the damage index exceeds the threshold, it can be considered that the bolt looseness damage occurs in fl ange assembling joint, thereby to realize the damage identifi cation. The results both numerical analyses of a practical transmission tower and scaled model wind tunnel experiment of a steel tubular tower show that the proposed method is effi cient and noise immunity on the bolt looseness location detection for high-rise tower.
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