| 刘一雄1，2，3 ，丛佩红 1，2 ，郭勇1 ，杨治中 1 ，郑茂军 1.喘振载荷作用下风扇转静子碰摩研究[J].航空发动机,2023,49(2):112-117 |
| 喘振载荷作用下风扇转静子碰摩研究 |
| Study on Blade and Stator Rub-impact Under Surge Load |
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| DOI： |
| 中文关键词: 喘振 尺寸链 热态间隙 碰摩响应 转静子碰摩 风扇叶片 航空发动机 |
| 英文关键词:surge dimensional chain hot clearance rubbing response blade and stator rubbing fan blade aeroengine |
| 基金项目:航空动力基础研究项目资助 |
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| 中文摘要: |
| 某风扇试验件在进入喘振后发生转静子碰摩故障，转子叶片与其上游静子叶片的尾缘发生碰摩并产生掉块、卷边等损
伤。为明确故障发生的原因，结合数值仿真和试验结果排除了共振和颤振的发生。根据压力脉动数据确定了喘振载荷，并考虑在
喘振作用下轴向力轻载反向、转速升高、机匣变形、静子叶片变形等因素的影响，开展了基于尺寸链的转静子叶片热态间隙分析，
对叶片在喘振载荷作用下的碰摩响应进行了模拟分析。结果表明：在喘振载荷短时冲击作用下，转子叶片向后缘方向产生3.42 mm的
变形，收敛型风扇通道使得径向间隙明显减小，叠加风扇转速升高、轴向力轻载反向等因素，转子叶片叶尖尾缘轴向向后的位移超
出机匣涂层覆盖区域0.41 mm，导致尾缘与机匣基体的径向间隙为-0.44 mm，进而发生径向碰摩；在多次往复的大冲击载荷作用
下，转子叶片向前与上游静子叶片发生轴向碰摩。合理设置机匣耐磨涂层长度和流道倾角可以有效降低喘振过程中碰摩的风险。 |
| 英文摘要: |
| A fan component experienced a rub-Impact fault during the surge process and the middle-stage fan blades rubbed with its
upstream stators，leading to metal shedding and edge curling. In order to clarify the causes of the fault，numerical simulation and test data
analysis were conducted and the occurrence of resonance and flutter were excluded. The surge load was estimated by analyzing the fluctua?
tion pressure data. The analysis of blade and stator hot clearance based on dimensional chains during surge was conducted considering the
surge-induced effects，such as light/reversed axial load，rotor speed rise，casing deformation，blade and stator deflection，etc. The rub?
bing response of the blade and rotor was analyzed using transient simulation. The results show that under the short-duration impact of surge
load，the fan blade trailing edge deflected downstream by 3.42 mm，resulting in the reduction of radial tip clearance since the fan passage
is convergent. Combining the influences of fan speed rise and light/reversed axial load on the tip axial clearance，the axially displaced
blade tip trailing edge exceeded the casing coating area by 0.41 mm，causing a -0.44 mm tip clearance between the blade trailing tip and
the casing substrate，indicating a radial rubbing. Under the repeated huge impact loadings，the blade deflected upstream and collided with
the stator. Appropriate design of the axial dimension of abradable coating and the flow passage incidence angle can effectively reduce the
risk of rubbing in case of a surge. |
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