【摘要】 采用数值模拟方法,研究扇形周向角度、导流板结构形式以及低能流体抽吸对扇形叶栅试验件出口流场周向均匀性和可测量流道数量的影响.在考虑实验室风洞流量条件的基础上,通过对比分析导叶、静叶出口马赫数和气流角的周向分布,确定具有最佳周期性的扇形叶栅设计方案为具有110°扇形周向角、斜导流板且无抽吸的设计方案.研究结果表明,在亚声速来流条件下,增加流道数量(扇形角度)有助于提高扇形叶栅周期性;导流板采用斜导流板形式且无抽吸方案,可以获得具有较好周期性的试验件流场,可测流道数可以增加到5个.更多还原

【Abstract】 Numerical simulation was used to study the influence of circumferential angle, structure of the guide plate and low-energy fluid suction on the sector cascade outlet uniformity and measurable number of runners. On the basis of considering the flow conditions in the laboratory wind tunnel, by comparing and analyzing the circumferential distribution of Mach number and flow angle at the outlet of guide vane and stator vane, the optimum design scheme of sector cascade was determined to be a design scheme with 110 degree sector circumferential angle, oblique guide plate and no suction. Results show that increasing the number of channels(sector angle) is helpful to improve the periodicity of sector cascade under the condition of subsonic flow, and the flow field with better periodicity can be obtained with inclined guide plate form and no suction scheme, and the number of measurable runner can be increased to 5.更多还原