导管螺旋桨不同桨叶的叶梢泄露涡分析

Analysis of tip leakage vortex of different blade in ducted propeller

为了深入探讨叶梢泄露涡的流动机理,研究了导管螺旋桨中桨叶螺距比与盘面比对叶梢泄露涡的影响,以及不同桨叶中叶梢泄露涡、叶梢负荷与叶梢泄露流三者之间的关联.采用数值方法对不同桨叶的导管螺旋桨流场进行了模拟分析.结果表明:当螺距比增大,叶梢泄露涡逐渐远离桨叶吸力面,涡核空化数降低;当盘面比增大,叶梢泄露涡的轨迹基本不变化,涡核空化数提高;叶梢泄露流通过与叶梢泄露涡之间的流动剪切作用影响叶梢泄露涡的发展;叶梢泄露流流速受到叶梢负荷的影响,负荷越高的位置,叶梢泄露流的速度也越高.

The effects of pitch ratio and blade area ratio on the tip leakage vortex （ TLV） were studied in a ducted propeller. Furthermore, the relationship among the TLV, tip loading and tip leakage flow （ TLF） of different blades was discussed. The flow field of the ducted propeller with several different blades was numerically simulated and analyzed and the results showed that as the pitch ratio increased, the tip leakage vortex moved away from the suction side of the blade, and the core cavitation number decreased. As the blade area ratio grew, the vortex core trajectory did not alter, and the vortex core cavitation number rose. The TLV was influenced by TLF through flow shearing, while the TLF was controlled by the tip loading, the velocity of TLF at the position with heavier loading was higher.