A Blade Release Method for FBO Test

作者：He, Z.; Xuan, H.^*; Bai, C.

来源：Experimental Techniques, 2018, 42(3): 311-318.

DOI：10.1007/s40799-018-0233-6

• FBOtest
• Fan blade
• Release method
• Heating
• Target speed
• Additional kinetic energy

The FBO certification test is enforced before a new civil turbofan engine can be allowed to enter into production. This test is extremely expensive. Thus, an accurate and reliable blade release method is quite essential. Traditional notched blade method and pyrotechnic method have some disadvantages such as labor-intensive or undefined energy added. In this paper, a new blade release method by locally heating the dovetail of blade was developed. A hole was drilled along the dovetail of blade to introduce a weak cross-section and provide the mounting space for the heater. Being locally warmed up, the blade can be released under centrifugal pull load, due to the inverse relationship between the material tensile strength and temperature. FEM models were established to analyze the stress and temperature in the designed structure. A heating system was designed to realize the heating. A FBO containment test was conducted successfully using this method. The fan blade was released at the target speed exactly. Meanwhile, no additional kinetic energy was introduced. This method shows a potential to improve efficiency and reduce cost for FBO tests.

• 出版日期2018-6
• 单位浙江大学