干旱区生态环境知识资源中心(Arid): A Computational Study on Rotor and Fuselage Configuration Effect on Rotorcraft Brownout

Arid

DOI	10.4050/JAHS.67.012001012001-1
	A Computational Study on Rotor and Fuselage Configuration Effect on Rotorcraft Brownout
	Ghosh, Sayan; Rajagopalan, R. Ganesh
通讯作者	Ghosh, S (corresponding author)，Iowa State Univ, Dept Aerosp Engn, Ames, IA 50011 USA.
来源期刊	JOURNAL OF THE AMERICAN HELICOPTER SOCIETY
ISSN	0002-8711
EISSN	2161-6027
出版年	2022
卷号	67 期号:1
英文摘要	Rotorcraft brownout is an in-flight visibility restriction caused by clouds of sand and dust particles during landing, takeoff, and near-ground flight operations in arid desert terrain. This complex phenomenon is caused by the entrainment of dust, sand, and ground particles by rotor downwash and is compounded by fuselage geometry and its orientation with respect to the ground. Highly unsteady wind velocities are common in near-ground operations and play a significant role in the particulate cloud's behavior that creates the brownout condition. Experiments and flight tests to understand brownout are challenging, expensive, and risky. Alternatively, computational fluid dynamics (CFD) has been used extensively over the past few decades to study rotorcraft aerodynamics. However, there are additional computational challenges associated with modeling the dust particle transport in a brownout. In this work, a computationally efficient Eulerian-based framework has been developed to model rotorcraft brownout. The flowfield is modeled by Reynolds averaged Navier-Stokes (RANS) equation and is solved using the SIMPLER algorithm. Turbulence properties are modeled using Realizable k - epsilon equations, while the rotor is modeled as a momentum source to focus on the global flowfield rather than the flow near the rotors. The Eulerian approach for both the flowfield and the dust transport allows computationally efficient and rapid analysis, taking an order of few hours in a single CPU to a fraction of an hour using GPU-based computation. In this work, results from two sets of experiments are presented. At first, a study on the fuselage's effect on brownout with respect to height for a single-rotor configuration in hover is demonstrated. Next, a study on the brownout characteristics of three rotor-fuselage configurations in hover, namely single-rotor, tandem-rotor, and quad-rotor, is presented. It has been observed that the ground friction velocity profile and flowfield vorticity around the rotorcraft play a significant role in dust cloud behavior. Additionally, the body forces and interference due to the fuselage plays a vital role in the formation of brownout dust clouds. The experiments showed that the quad-rotor is worst affected in terms of size and height of the dust clouds. However, the tandem-rotor has been found to be worst in the terms of average dust density.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000741642300003
WOS关键词	PREDICTION
WOS类目	Engineering, Aerospace
WOS研究方向	Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376809
作者单位	[Ghosh, Sayan; Rajagopalan, R. Ganesh] Iowa State Univ, Dept Aerosp Engn, Ames, IA 50011 USA; [Ghosh, Sayan] Iowa State Univ, New York, NY USA; [Ghosh, Sayan] GE Res, Engn, New York, NY USA
推荐引用方式 GB/T 7714	Ghosh, Sayan,Rajagopalan, R. Ganesh. A Computational Study on Rotor and Fuselage Configuration Effect on Rotorcraft Brownout[J],2022,67(1).
APA	Ghosh, Sayan,&Rajagopalan, R. Ganesh.(2022).A Computational Study on Rotor and Fuselage Configuration Effect on Rotorcraft Brownout.JOURNAL OF THE AMERICAN HELICOPTER SOCIETY,67(1).
MLA	Ghosh, Sayan,et al."A Computational Study on Rotor and Fuselage Configuration Effect on Rotorcraft Brownout".JOURNAL OF THE AMERICAN HELICOPTER SOCIETY 67.1(2022).