Design method of irregular air film cooling hole

Abstract

The invention discloses a design method of an irregular air film cooling hole. The method is characterized in that the irregular air film cooling hole is designed; basic data of various holes are determined; a calculating model is built; the expansion area ratio is calculated; the mutual influence among the parameters and the influencing mechanism are fully researched. The design method is beneficial for guiding engineering practice. According to the method, the common irregular air film cooling hole is subjected to numerical simulation under different efflux angles and divergence angles; different modelling parameters, including thermal insulation cooling efficiency under air blowing area, momentum ratio and speed ratio, a section temperature field in the hole, and temperature and speed fields in the hole, are compared and matched to obtain modelling parameters to be matched; the hole type and the parameter changing rules are summarized to find out the optimal modelling parameters of certain hole type, thus the hole type parameters can be inversely solved based on the optimal modelling parameters; and a simple and easy-implementing design method is supplied to design the irregular air film cooling hole.

Description

technical field [0001] The invention relates to the field of design of air film holes of gas turbine engines, in particular to a method for designing air film cooling holes of heavy-duty gas turbines for power generation, aeroengines and ship gas turbines. Background technique [0002] Cylindrical air film holes are the most commonly used and easiest film cooling hole type for aero-engines, but a large number of studies have shown that special-shaped air film holes can effectively weaken the penetration of air film jets in the mainstream, making the air film The jet is easy to attach to the wall under the action of the mainstream, so as to obtain better film cooling effect. It is a hot issue in the current film cooling research to try to obtain a better film cooling effect at the same or less cold air mass flow rate by designing a better hole pattern. [0003] In recent years, Thole et al. proposed a standard expansion shaped hole: 7-7-7 hole, That is, the forward-inclined...

AI Technical Summary

Problems solved by technology

Although there are many studies on fan-shaped holes and forward-inclined fan-shaped holes, they often focus on the influence of a certain structural parameter or boundary condition on the cooling characteristics of special-shaped holes. Research

Moreover, the influence of various parameters is intricate, in order to guide engineering practice, it is necessary to summarize a design rule that is easy for engineers to use

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