【摘要】 计算并分析了高马赫数情况下,直叶片及正弯20°叶片在攻角分别为0°、±10°、±20°及±30°的情况下的流场结构. 采用的数值方法为具有TVD性质的三阶精度GODUNOV格式,湍流模型为B-L代数模型. 计算结果表明,在较大的攻角范围内,正弯叶片可以减小叶栅流道内通道涡的强度,并且由于两端壁的附面层被吸入主流,使得正弯叶片中的能量损失减小. 攻角越大,正弯叶片的作用越明显.更多还原

【Abstract】 The flow field structure and loss distribution of straight and positively curved blade under the condition of different incidences, which includes 0°、±10°、±20° and ±30°, at high Mach number are studied systematically. The numerical method used is the third order GODUNOV scheme with TVD property and the turbulence model is B-L algebraic model. Since the boundary layer at both endwalls are sucked into the main stream, the results indicate that under the condition of high outlet Mach number, the total energy loss in cascade can be decreased in case of all studied incidences. The larger the incidences, the more considerable the effect of positively curved blade on controlling secondary flow.更多还原