The Force and Pressure of A Diffuser-Eqipped Bluff Body in Ground Effect  

Oleh:

Senior, Andrea E. ; Zhang, Xin

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Fluids Engineering vol. 123 no. 1 (2001), page 105-111.
Topik: pressure; force; pressure; diffuser - eqipped; bluff body

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ89.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

The force and pressure behaviour of a generic diffuser in ground effect were investigated. The diffuser model is a bluff body with a rear diffuser at 17 deg to the horizontal, and side - plates. Measurements were conducted in a low speed wind tunnel equipped with a moving ground facility. Techniques employed were force balance, pressure taps, and surface flow visualization. The diffuser flow in ground effect was characterized by vortex flow and three - dimensional flow separation. Four types of force behavior were observed : (a) down - force enhancement at high ride heights characterized by an attached symmetric diffuser flow, (b) maximum down - force at moderate ride heights characterized by a symmetric diffuser flow and separation on the diffuser ramp surface, (c) down - force reduction at low ride heights characterized by an asymmetric diffuser flow and flow separation, and (d) low down - force at very low ride heights, also characterized by an asymmetric diffuser flow and flow separation. The down - force reduction near the ground is attributed to flow separation at the diffuser inlet and subsequent loss of suction in the first half of the diffuser.

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