摘要
为探索某次试验过程中燃气发生器点火故障的原因,从超声波检测、有限元数值模拟、水压爆破三个方面对燃烧室壳体进行了研究,基本认定燃烧室壳体不大于2.0mm缺陷不会对燃气发生器工作性能造成影响。从三台燃气发生器地面联合试验性能数据、试验后壳体外形数据可以看出,燃气发生器点火压强峰、点火起动时间、平均工作压强一致性较好,再一次佐证了上述研究结果。从可视缺陷试验分析可知,在铝合金铸锭熔铸过程中未能有效控制工具变形,造成铝管熔铸生产开头、收尾时间偏长,是导致异常情况的原因。在热挤压条件下铸锭被挤压成厚壁铝合金管材过程中,原来存在于铸锭当中的夹杂沿挤压方向多呈线形分布。后续工作中管材毛坯在出厂前全部进行超声波检测,符合AA级的才能用于燃烧室壳体的机加。采用措施后交付的30台燃烧室壳体均通过了天地试验的考核。一方面证明了改进措施的有效性,另一方面证明了超声波检测、有限元分析、水压爆破试验的正确性。
In order to explore ignition failure causes with the gas generator, chamber shell are wholly researched from ultrasonic testing, numerical simulation of finite element and water pressure blasting. Primarily thinking the defective equivalent diameter is not more than 2.0mm that is not introduced action influence for the working performance with the gas generator. With the three gas generators from performance and chamber shell shape dimension data indicate that, ignition pressure peak value, ignition starting time, average working pressure are more accordant, once more that provide proof test. The visual defecting mechanism testing results show that the unusual circumstance of equipments deformation is leaded to the chamber failure that the time of beginning and ending is longer than before because of aluminum tube fusion-cast. In the hot extrusion, majority slag material is crush-forming into the linear distribution in the extrusion direction that is existed in the aluminum tube cast. Therefore ultrasonic inspection is carried out for the tube blank. The detecting grade is large AA that is used into checked acceptance and machining operation. The 30 chamber shells passed the ground and flight test after taking measures. On one hand that indicates availability of taking measures, on the other hand that give the correctness of ultrasonic testing, numerical simulation of finite element and water pressure blasting.
出处
《战术导弹技术》
北大核心
2016年第6期58-64,共7页
Tactical Missile Technology
