摘要
为了解某航空发动机空气涡轮起动机包容结构对其包容性的影响,采用LS-DYNA软件对空气涡轮起动机的包容性进行数值仿真,并在高速旋转试验台上开展了多次包容性试验。试验中采用涡轮盘预制裂纹的方式,使涡轮均匀破裂成3块,针对不同厚度的包容结构和不同的包容环支承结构分别进行包容试验。试验结果表明:在厚壁包容结构试验中轮盘碎块飞出,包容效果不理想;在薄壁包容结构试验中轮盘碎块击穿内层壳体并撞击包容环,轮盘碎块无飞出,包容效果较为理想;在薄壁包容结构试验中采用螺钉固定支承结构,第1次试验成功包容,第2次试验中涡轮盘被包容但组件倒翻,在第3次试验中采用凸台加固支承结构成功包容,表明选用合适的包容结构及其支承结构对确保其具备有效的包容能力十分重要。研究结果对空气涡轮起动机的包容结构设计有很好的指导意义。
In order to understand the influence of the containment structure of an aeroengine air turbine starter on its inclusiveness,the numerical simulation of the inclusiveness of the air turbine starter was carried out by using the software of LS-DYNA. Several inclusiveness tests were carried out on a high-speed rotating test-bed. In the tests,the turbine was cracked evenly into three pieces by the way of prefabricating cracks on the turbine disk. The containment tests were carried out for the containment structures with different thickness and the supporting structures with different supporting rings. The experimental results show that in the test of thick wall containment structure,the turbine disk fragments fly out and the containment effect is not satisfactory. In the test of thin wall containment structure,the turbine disk fragments break through the shell of the inner layer and impact the containment ring,the turbine disk fragments do not fly out and the containment effect is satisfactory. The screw-fixed support structure is adopted in the test of thin wall containment structure and the first test is successful. In the second test,the turbine disk is contained but the module turns over. In the third test,the support structure strengthened by convex abutment is successful. It is shown that it is very important to select suitable containment structures and supporting structures to ensure that it has effective containment ability. The study results have great significance for the design of containment structure of the air turbine starters.
引文
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