Effects of swept-angle on leading-edge separation bubble characteristics

Abstract

The major objective of the present study is to get a better understanding of the yawed leading-edge separation bubble. Experiments has been carried out to verify the effects of swept-angle on leading-edge separation bubble characteristics and stalling characteristics. Detailed wall pressure distribution, wall pressure fluctuation and surface-shear fluctuation were measured in the leading-edge separation bubble region for five swept-wing models with different swept-angle. For a given angle of attack, separation \& transition points move downstream and the total bubble length increases with increasing absolute value of swept-angle. The reverse flow region of separation bubble has very vigorous fluctuations and the transition region of separation bubble has a characteristic fluctuating frequency.