平面叶栅风洞流场品质的被动调控策略
Passive control strategy for flow quality of linear cascade wind tunnel
蔡明 1高丽敏 1晋文浩 1雷祥福1
作者信息
- 1. 西北工业大学动力与能源学院,西安 710129;西北工业大学翼型、叶栅空气动力学国家级重点实验室,西安 710129
- 折叠
摘要
为了提升高负荷叶型的平面叶栅试验流场品质以保证试验数据的可靠性和准确性,建立了平面叶栅流场品质的评价参数,提出了中间流线型上端壁及其与出口可调尾板组合的两种被动调控方案.采用试验验证的数值模拟方法研究了以上两种方案对高负荷平面叶栅流场品质的调控策略.结果表明:两种调控方案均能够有效抑制上端壁区域的流场恶化,进而提升平面叶栅的来流准确性、流场周期性以及二维性.采用与平面叶栅理想中间流线相匹配的上端壁安装角和周向距离,以及尾板安装角时,两种方案对流场品质的提升效果最好.中间流线型上端壁组合出口尾板方案优于中间流线型上端壁方案,使叶栅中间3个叶片通道的进口马赫数偏差不超过±0.005,来流攻角偏差不超过±0.3°;叶栅进口和出口马赫数的周期性偏差不超过0.005,气流角的周期性偏差不超过0.3°;设计攻角下叶栅轴向速度密度比(AVDR)达到1.1,叶栅二维性较好.两种调控方案对叶栅大攻角工况的流场品质调节具有很好的适用性.
Abstract
To improve the flow quality of linear cascade tests with high-loading blade sections and ensure the reliability and accuracy of test data,the evaluation parameters of flow quality of linear cascade were established,and two passive control schemes of intermediate streamlined upper end-wall and its coupling with outlet adjustable tailboards were proposed.The control strategies of the above two schemes on the flow quality of high-loading linear cascade were studied by numerical simulation method verified by experiments.The results showed that both schemes can effectively suppress the deterioration of flow field near the upper end-wall area,thus improving the inflow accuracy,flow periodicity and two-dimensionality of cascade.When the set angle and gap of the upper end-wall and the tailboard angle matched the ideal intermediate streamline of cascade,the two schemes presented the best improvement on the flow quality.The scheme of intermediate streamlined end-wall combined outlet tailboards was superior to the intermediate streamlined end-wall scheme,such that the inlet Mach number deviation of the central three blade passages was less than±0.005,and the incidence angle was less than±0.3°.And the periodicity deviation of inlet and outlet Mach numbers shall not exceed 0.005,and the periodicity deviation of inlet and outlet flow angles shall not exceed 0.3°.The axial velocity density ratio(AVDR)of cascade was 1.1 at the incidence angle of 0°.The two control schemes showed good applicability to the flow quality adjustment of cascade at high incidence angle.
关键词
平面叶栅试验/端壁改型/尾板/流场品质/准确性/周期性Key words
linear cascade test/end-wall modification/tailboards/flow quality/accuracy/periodicity引用本文复制引用
基金项目
国家科技重大专项(2017-Ⅱ-0001-0013)
高等学校学科创新引智计划(111计划)(B17037)
国家自然科学基金重点项目(51790512)
出版年
2024
NETL
NSTL
万方数据