热流固耦合下某航空叶片变形机理仿真分析

Simulation Analysis of Deformation Mechanism of an Aviation Blade under Thermal-Fluid-Structure Coupling

为了研究热流固耦合作用下航空叶片的变形机理,通过建立精细的单向与双向热流固耦合模型,对叶片在不同环境温度(进口总温)下的变形规律和变形机理进行了深入分析。结果表明:热流固耦合作用对叶片的变形具有显著影响,温度和压力是主要影响因素;在双向热流固耦合时,随着环境温度的升高,叶片的最大变形从293 K时的0.477 0 mm增大到1 573 K时的2.105 1 mm;当环境温度为293 K时,双向耦合叶片的应力应变主要集中在叶片根部,且在叶片前缘和后缘出现最大等效应力820.21 MPa以及最大等效弹性应变0.005 6;在环境温度为293 K时,单向和双向热流固耦合叶片最大变形分别为0.397 6和0.477 0 mm,最大等效应力分别为795.53和820.21 MPa,单向耦合叶片最大变形和最大等效应力相对于双向耦合的偏差分别为16.64%和-3.01%;随着环境温度的升高,单向和双向热流固耦合叶片最大变形的差值越大。

In order to study the deformation mechanism of aviation blades under thermal-fluid-structure coupling,the deformation rule and deformation mechanism of blades under different ambient temperatures(total inlet temperature)were deeply analyzed by establishing fine unidirectional and bidirectional ther-mal-fluid-structure coupling models.The results show that the thermal-fluid-structure coupling has a sig-nificant effect on the deformation of the blade,and the temperature and pressure are the main influencing factors.Under bidirectional thermal-fluid-structure coupling,the maximum deformation of the blade in-creases from 0.4770 mm at 293 K to 2.1051 mm at 1573 K with the increase of ambient temperature.When the ambient temperature is 293 K,the stress-strain of the bidirectional coupling blade is mainly concentrated at the root of the blade,and the maximum equivalent stress of 820.21 MPa and the maxi-mum equivalent elastic strain of 0.0056 appear at the leading edge and trailing edge of the blade;when the ambient temperature is 293 K,the maximum deformation and maximum equivalent stress of unidirec-tional and bidirectional thermal-fluid-structure coupling blades are the closest,which are 0.3976 and 0.4770 mm as well as 795.53 and 820.21 MPa,respectively.The deviations of the maximum deforma-tion and maximum equivalent stress of unidirectional coupling blades from that of the bidirectional coupling blades are 16.64% and-3.01%,respectively.With the increase of ambient temperature,the difference of maximum deformation between unidirectional and bidirectional thermal-fluid-structure coupling blades increases.