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Your search keyword '"Xu, Zhirong"' showing total 4 results
Start Over Author "Xu, Zhirong" Publisher iop publishing
4 results on '"Xu, Zhirong"'

2. First-principles study of a new BP2 two-dimensional material.

Author

Gu, Zhizheng, Yu, Shuang, Xu, Zhirong, Wang, Qi, Duan, Tianxiang, Wang, Xinxin, Liu, Shijie, Wang, Hui, and Du, Hui

Subjects
BAND gaps, MOLECULAR dynamics
Abstract

Two-dimensional materials have a wide range of applications in many aspects due to their unique properties. Here we carry out a detailed structural search and design of the BP2 using the first principles method, and find a new PMM2 sheet. The analysis of the phonon dispersive curves shows that the 2D PMM2 is dynamic stable. The study of molecular dynamics shows that the 2D PMM2 can be stable under high temperature, even at 600 K. Most importantly, when a suitable strain is applied, the structure can exhibit other electronic properties such as direct band gap semiconductor. In addition, the small strain can tune the band gap value of the PMM2 structure to around 1.4 eV, which is very close to the ideal band gap of solar materials. Therefore, the 2D PMM2 may have potential applications in the field of photovoltaic materials. [ABSTRACT FROM AUTHOR]

Published
2022
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4. Influence of thrust fins on hydrodynamic performance of pod propeller

Author

Zhenqiu Yao, Xu Zhirong, Wenyu Liu, and Hongjie Ling

Subjects
Point of delivery, Propeller, Thrust, Geology, Marine engineering
Abstract

Based on the viscous flow theory, the influence of the arrangement and geometrical changes of the thrust fins on the hydrodynamic performance of the pod propeller is studied by using the sliding grid technology and the commercial fluid calculation software FINE / marine.The results show that the extension of the thrust fin can slightly increase the resistance performance and propulsion efficiency of the pod propeller while significantly reducing the lateral force of the pod.Changing the circumferential position of the thrust fin can change the magnitude and even the direction of the total lateral force of the nacelle without affecting the resistance of the propeller. The thruster is the most efficient when the circumferential angle of the thrust fin is 60 degrees.When the initial angle of attack of the fin is in the range of -4 to 8, the angle of attack is larger, the efficiency of the thruster is higher, the total lateral force is smaller, and the cabin resistance is smaller. However, after the angle of attack is greater than 4 degrees, the cabin resistance is no longer reduced.

Published
2020

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