Effect of Boattail Angle on Pressure Distribution and Drag of Axisymmetric Afterbodies under Low-Speed Conditions

被引：17

作者：

Tran, The Hung ^{[1
]}

Ambo, Takumi ^{[1
]}

Chen, Lin ^{[1
]}

Nonomura, Taku ^{[1
,2
]}

Asai, Keisuke ^{[1
]}

机构：

[1] Tohoku Univ, Dept Aerosp Engn, Sendai, Miyagi 9808579, Japan

[2] JST, Sendai, Miyagi 9808579, Japan

来源：

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES | 2019年 / 62卷 / 04期

关键词：

Axisymmetric Afterbody; Afterbody Pressure Drag; Base Drag; MSBS; Aerodynamic Characteristics; BASE; REDUCTION;

D O I：

10.2322/tjsass.62.219

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

This study is focused on the effect of boattail angle on the pressure distribution and drag force of axisymmetric afterbodies under low-speed conditions. Experiments were conducted on three conical boattails with angles of 10 degrees, 14 degrees and 20 degrees. The diameter-based Reynolds number is approximately 4.3 x 10(4) under the experimental conditions. Two types of flows, a fully-attached flow (beta = 10 degrees) and a flow with a separation bubble (beta = 14 degrees, 20 degrees), were observed. The aerodynamic drag measurements were conducted using both a strut-supported model and a support-free (levitated) model. The results show that boattail model with the angle of 20 degrees has a relatively large effect on the pressure distribution. The pressure drag resulting from pressure distribution on the vertical plane indicates that the model with a boattail angle of 14 degrees has the lowest drag. A good trend in agreement between afterbody drag (measured using pressure taps) and total aerodynamic drag (measured using the levitated system) was obtained. The effect of strut support on pressure distribution at different polar angles is also explained in this study.

引用

页码：219 / 226

页数：8

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