Optimization design method for asymmetric leading edge structure of turbine blade based on uniform design

Abstract

The invention discloses an optimal design method for an asymmetric front edge structure of a turbine blade based on uniform design, and belongs to the field of gas turbine engines. Firstly, mathematical modeling is carried out, then a control variable is adopted to carry out trial calculation and reduction on a design parameter change range, finally, uniform design is adopted to optimize asymmetric leading edge structure design parameters in the reduction range, a calculation sample is generated, numerical calculation is carried out, and a result with the minimum total pressure loss is obtained. According to the method, it is guaranteed that design parameters of the asymmetric leading edge have the statistical characteristic of uniform distribution, and each level of each factor can be subjected to one time and only one time of test, so that the coupling effect between parameter changes can be weakened, and an ideal optimization result can be obtained through the least number of tests. The control effect of the result obtained through the method on the total pressure loss is far greater than the control effect of the result obtained through simple control variable trial and error calculation.

Description

technical field [0001] The invention belongs to the field of gas turbine engines, and in particular relates to an optimization design method based on a uniformly designed asymmetrical leading edge structure of a turbine blade. Background technique [0002] There is a very complex secondary flow vortex system in the turbine end area, and the secondary flow loss has an important impact on the turbine efficiency and even the performance of the entire engine. The secondary flow loss caused by the secondary flow eddy system is the main component of the end zone loss. Therefore, from the perspective of weakening / suppressing the vortex, domestic and foreign scholars have proposed many methods to control the secondary flow in the end zone. As a simple and low-cost control method, leading edge trimming has shown broad application prospects in turbine end-zone flow control. [0003] Zess et al. first applied a band-like structure to the leading edge of the blade root of a turbine gu...

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Problems solved by technology

Although the control variable trial and error method is used to optimize the design parameters of the leading edge structure to a certain extent, the optimization process relies on the regularity of the cascade loss after modifying a single design parameter, and does not consider the coupling of different design parameter changes. The effect of the effect on the flow control effect, the screening of the calculation sample is not balanced and not comprehensive

But if you calculate one by one according to the permutation and combination, n design variables, each variable has m cases, you need to calculate at least m n As a result, the number of samples increases exponentially, and the workload is too huge

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