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International Conference on Computer Simulation in Physics and Beyond IOP Publishing IOP Conf. Series: Journal of Physics: Conf. Series 1163 (2019) 012022 doi:10.1088/1742-6596/1163/1/012022 cylindrical cross-sections of prototype blade are separated layer by layer (figure 2(a)), rotated by rotation axis according to αav in a way that the farthest from axis cross-section is rotated by αav and all other are rotated proportionally to selected cross-section radius (figure 2(b)). (a) (b) (c) Figure 2. Modification of the geometric model of the turbine blade prototype: the allocation of the meridional cross-sections (a), rotate the meridional cross-sections (b), completion of sections and construction of the modified blade (c). To reduce stresses in the impeller hub, decrease of a blade thickness is carried out by means of reducing thickness of profiles on the back part of a wheel (figure 2(c)). Model of a blade is designed considering turbine flow section and based on obtained basic profiles (figure 2(c)). On the second stage, the wheel of initial impeller is combined with obtained blades. Coupling of elements is realized by means of a fillet with a radius of 1,4·10-3 m. Then comparison of cross sections in initial blade and modified one is carried out. Profile analysis showed that they are partially deviated from radial direction in both sides. It can positively affect on centrifugal forces loads, because they will compensate each other. Strength analysis in conditions of a nominal mode is conducted in designed turbine impeller to control the effectiveness of a suggested method. Minimal safety factor of a modified turbine impeller increased to 1.18. In this case the most loaded place is a blade joint with a wheel on a circumference. That’s why it’s offered to investigate and chose the most effective variant considering gasdynamic and strength parameters. In this research practical measures are offered to reduce equivalent stresses in the most loaded areas: variant 1 with a radius of the fillet increased to 5·10-3 m in joint of a blade and a wheel (figure 3(a)), variant 2 with a triangle support (figure 3(b)), variant 3 with a parabolic support (figure 3(d)). The foundation of suggested configuration variants is strengthening of a blade joint with a wheel in a circumference by means of supports of different configurations. The first variant has good strength parameters, but increasing of a fillet diameter leads to decrease of gasdynamic parameters of flow and efficiency more than 1.5% because of geometric impediment for gas fluid during its movement in a turbine flow section. The second variant allows to avoid changes in the flow section, but, due to fact that thickness of a wheel in circumference is limited, blade support in stress raiser has a small thickness and low value of safety factor. To enhance blade support in the third variant, back blade surface was changed without any changes in configuration of a flow section in turbine. Radius of connection conic and flat back surfaces of blade are increased. In figure 3c a turbine blade is shown in a meridian section view of the impeller and also an area of strengthened material in the blade. Interface diameter from flat surface to conic one was increased without changes in an outlet blade edge. 3PDF Image | Development of radial turbines in low power Gas turbine engines
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