Asymmetries and similarities of yawed rotor wakes

Author:

Xiong Xue-Lu12ORCID,Laima Shujin12ORCID,Li Hui123ORCID

Affiliation:

1. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China

2. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China

3. Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China

Abstract

This paper describes an experimental study of the asymmetries and self-similarity/self-preservation of yawed rotor wakes and the similarity between different yaw angle scenarios. The wake asymmetry is found to increase with increasing yaw angle and also increases in the streamwise direction before the wake reaches a state of self-similarity. Furthermore, if we divide the profiles into left and right parts, the normalized profiles are the same for different streamwise locations even in the region where the profiles have not reached a state of self-similarity. The relation between the asymmetry of the velocity deficit profiles and the yaw angle is derived theoretically and validated by the present experimental measurements. A critical yaw angle is determined for the similarity in the streamwise evolution of the wake between different yaw angle scenarios. Specifically, there is a similarity between different yaw angle scenarios when the yaw angle is below the critical value. The results of this study will be helpful in understanding yawed rotor wakes and establishing a yawed rotor wake model.

Funder

National Natural Science Foundation of China

China Scholarship Council

Department of Science and Technology of Guangdong Province

Natural Science Foundation of Heilongjiang Province

Postdoctoral Scientific Research Development Fund of Heilongjiang Province

Heilongjiang Touyan Team

Fundamental Research Funds for the Central Universities

Publisher

AIP Publishing

Subject

Condensed Matter Physics,Fluid Flow and Transfer Processes,Mechanics of Materials,Computational Mechanics,Mechanical Engineering

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