Structural strength analysis of twin-web turbine disk for aero-engines
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摘要:
面向高推质比航空发动机设计要求,以某航空发动机单辐板涡轮盘为基准,采用ANSY Fluent数值计算温度场和ABAQUS计算应力场,对比分析了单辐板涡轮盘和双辐板涡轮盘周向应力、径向应力和Von-Mises等效应力分布特点;重点研究了双辐板涡轮盘辐板倾角(
θ )变化(8°≤θ ≤ 12°)对双辐板涡轮盘应力水平影响规律。结果表明:与基准单辐板涡轮盘相比,双辐板涡轮盘结构减重效果明显,θ =8°,9°,10°,11°和θ =12°双辐板涡轮盘质量分别降低22.78%、23.23%、23.42%、23.2%以及23.16%。双辐板双传力路径结构特征使得双辐板涡轮盘的载荷和应力分布更加均匀,θ =12°双辐板涡轮盘应力水平在所研究倾角范围内最优,其最大周向应力、最大Von-Mises等效应力、关键点最大平均周向应力和关键点最大Von-Mises等效应力分别比θ =8°双辐板涡轮盘降低了15.66%、16.03%、15.65%和17.09%。未来进行双辐板涡轮盘结构设计时,应该将辐板倾角θ 作为关键因素。Abstract:In response to the design requirements of high thrust-to-weight ratio aero-engines, a single-web turbine disk of an aero-engine was selected as the benchmark. The temperature field was numerically calculated using ANSYS Fluent and the stress field was calculated using ABAQUS. The distribution characteristics of circumferential stress, radial stress and Von-Mises equivalent stress of single-web and twin-web turbine disks were compared and analyzed. The influence law of the web inclination angle (
θ ) on the stress level of the twin-web turbine disk was mainly studied. Results show that compared with the reference single-web turbine disk, the structural weight reduction effect of the twin-web turbine disk is obvious. The weights of the twin-web turbine disks withθ =8°,θ =9°,θ =10°,θ =11° andθ =12° are reduced by 22.78%, 23.23%, 23.42%, 23.2% and 23.16% respectively. The structural characteristics of the twin-web transmission path make the load and stress distribution of the twin-web turbine disk more uniform. The stress level of the twin-web turbine disk withθ =12° is the best in the study range, and its maximum circumferential stress, maximum Von-Mises equivalent stress, maximum average circumferential stress at the key points and maximum Von-Mises equivalent stress at the key points are respectively reduced by 15.66%, 16.03%, 15.65% and 17.09% compared with the twin-web turbine disk withθ =8°. In the future, the web inclination angleθ should be regarded as a key factor when designing the structure of the twin-web turbine disk. -
表 1 GH4169物性表
Table 1. GH4169 material properties table
参数 温度t/℃ 20 100 200 300 400 500 600 700 热膨胀系数α/10−6 K−1 13.2 13.5 13.6 13.8 14 14.6 15 15.4 弹性模量 E/GPa 223 217 213 207 201 194 187 179 导热系数 $ \lambda $/(W/(m$ \cdot $K)) 9.3 9.98 11.26 12.54 14.07 15.66 17.47 18.15 泊松比 $ \mu $ 0.4 0.39 0.38 0.3 0.3 0.31 0.31 0.32 表 2 单辐板与双辐板涡轮盘质量对比
Table 2. Mass comparison between single-web and twin-web turbine disks
参数 单辐板涡轮盘 双辐板涡轮盘 θ=8° θ=9° θ=10° θ=11° θ=12° m/kg 0.340547 0.26296 0.261422 0.260776 0.26153 0.26166 Δm/kg 0 0.07758 0.079125 0.079771 0.07901 0.07889 降幅/% 0 22.78 23.23 23.42 23.20 23.16 -
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