S弯进气道内旋流的有源涡控研究

 本文给出了来流攻角为30°和40°、进口带分离区的方转圆截面S弯扩压管道内进行抽气形式的有源涡控的气流特性。研究表明,随涡控抽气量增加,旋流明显减小,当抽气量足够大时,整体涡基本被消除;出口平均总压损失下降;总压畸变减小;管道出口流量增大。因此,抽气形式的有源涡控是抑制旋流、减少出口总压平均损失、改善S弯进气道出口流场的有效措施。

VORTEX CONTROL INVESTIGATION OF SWIRL IN S-SHAPED DIFFUSER

The paper presents the characteristics of the flow through a S-shaped rectangular-round diffusing intake with a vortex control device. The diffuser was tested at 30° and 40° incidence. There is a separated flow region at bottom wall near throat of the duct. The vortex control device was set there, with which the line vortex was sucked out. The investigation shows that as suction increases the swirl can be depressed, even the bulk vertex disappears nearly if suction is large enough, and the total pressure coefficient η and total pressure distortion DC go down greatly. Hence, the method of vortex control is available for removing swirl, decreasing total pressure loss, and improving flow field in S-shaped intake.