Turbine blade profile line design method

Abstract

The invention relates to a turbine blade profile line design method. The method includes the following steps that an appropriate elliptic arc or a circular arc is selected according to a new secondary curve expression; after the appropriate geometric curve is selected, some relational expressions of determined control parameters are built by the adoption of a good blade profile which has passed the intensity and aerodynamic performance test, so that the relational expressions include the factors of the strength and aerodynamic performance naturally, the newly-formed blade profile cannot deviate from the good aerodynamic performance and intensity performance; in the aerodynamic performance and intensity calculation process, some reliable empirical formulas are referenced. The turbine blade profile line design method has the advantages that the appropriate elliptic arc, the parabolic arc and the double-curve arc can be selected for the new secondary curve expression to express the required curve segment, and the expression is further provided with the elastic spline feature, the secondary curve affine transformation feature is reflected, any stretching, compression and bending can be conducted, and thus the curve is modified conveniently to adapt to the requirements of aerodynamic performance and intensity calculation.

Description

technical field [0001] The invention relates to a method for designing a profile, in particular to a method for designing a profile of a turbine blade. Background technique [0002] Turbo-compression fluid machinery is the most critical rotating machinery in various important industries. Its work efficiency, reliability and safety have always been the focus of attention in the academic and business circles. The efficiency and reliability of the unit play a very important role in the economic benefits of the enterprise. In the design of the blade profile of this type of fluid machinery, the design of the impeller should not only have high efficiency for a single design condition, but also have a design that can meet multiple design conditions, high-efficiency variable condition performance, and large kick. Comprehensive advances in vibration margin. Therefore, in the design of the impeller, the best effect should be achieved by controlling the number of blades, the clearanc...

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Problems solved by technology

From the perspective of turbo fluid machinery impeller design process, for any design parameter or user requirement, generally many feasible schemes can be made, and then the designer selects the best scheme, such as using nonlinear programming, which belongs to The problem of optimal design can be attributed to the solution of optimization proposition. From the perspective of optimization theory, for a system that can be described by algebraic equations, it can be solved by mathematical programming theory, but for a system described by differential equations, such as N-S equations The internal flow of the turbomachinery can only be solved by the optimal control theory, but the calculation of this method is quite cumbersome and error-prone, so it is necessary to develop a simple calculation method to design the linear shape of the turbine blade, which was not found after searching The same or similar method as the present invention

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