Trisection grooving prefabrication method for disc, blade and shaft integrated turbine rotor with ultrahigh rotation speed

Abstract

The invention belongs to a burst rotation speed prediction technology and relates to a trisection grooving prefabrication method for a disc, blade and shaft integrated turbine rotor with ultrahigh rotation speed. The required burst rotation speed can be obtained accurately through groove prefabrication. The method mainly adopts an average stress method for theoretical calculation, and an initial grooving structure is obtained. In combination with a nonlinear finite element analysis method, the trisection burst rotation speed of the disc, blade and shaft integrated turbine rotor with the ultrahigh rotation speed is subjected to numerical simulation analysis, impact factors of a grooving process, a grooving width d, a grooving radius r and a grooving depth h are determined, and the grooving structure is further optimized. A gradual grooving method is adopted during a burst test, the residual sectional area after continuous grooving is a product of the square of the quotient when the burst rotation speed lower limit is divided by the burst rotation speed upper limit and the residual sectional area before grooving, and grooving is performed until the required burst rotation speed is obtained. With adoption of the method, the test times are reduced remarkably, the test efficiency is improved, the test cost is reduced, the method has higher practical application values, and the reliability of a starter system is improved, and the performance of a starter is optimized.

Description

technical field [0001] The invention relates to the field of aviation auxiliary power, in particular to a turbine rotor used for an aviation starter. Background technique [0002] The air turbine starter rotor runs at a very high speed. When the rotor parts (blades, discs, sealing rings, etc.) accidentally fall off or are damaged during work, they will be thrown out with huge energy under the action of huge centrifugal force . At this time, if the containment device cannot contain it, the debris flying out at high speed and high energy will pose a great threat to surrounding products and personnel. The speed of large engines is 10,000-20,000 rpm, the speed of medium-sized engines is about 40,000 rpm, and the speed of starter turbines is mostly 60,000 rpm or higher. Therefore, it is very important to determine the containment capacity of the containment ring to ensure the safety of the aircraft. The importance of rotor rupture speed prediction technology as the core technol...

AI Technical Summary

Problems solved by technology

At this time, if the containment device cannot contain it, the debris flying out at high speed and high energy will pose a great threat to surrounding products and personnel

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