High-efficiency mixed flow turbine
A technology of turbine and mixed flow, which is applied in the direction of supporting components of blades, engine components, machines/engines, etc., and can solve problems such as difficult design
Inactive Publication Date: 2009-12-16
大同北方天力增压技术有限公司
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Common turbines have three types: axial flow, radial flow, and mixed flow. As far as the working method is concerned, the mixed flow type is a mixed mode between the axial flow type and the radial flow type. The turbocharger is more effective, but the disadvantage is that the design is difficult and prohibitive
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[0057] Such as figure 1 As shown, the disc 3 is a semi-open disc, and the turbine blades 1 have twelve pieces in total. The turbine blade 1 is composed of a blade convex surface 4 and a blade concave surface 5 ( Figure 6 ). The airfoil curve adopts the double equation model.
[0058] Along the turbine inlet width b T1 The blade installation angle β 1Distribution law: In order to reduce the vortex loss at the turbine inlet on the convex surface of the blade, when the blade is obliquely cut along the airflow direction, the shape of the blade should match the relative velocity of the airflow, that is, a so-called "obliquely cut forward curved turbine" is formed. It is realized by adjusting the profile curve and blade thickness distribution law. Figure 7 shows β 1 distribution rule.
[0059] The blade thickness along the hub and outer base cylinder is as Figure 6 As shown, its thickness is related to the size of the turbine, the number of blades, the strength of the bla...
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The invention provides a high-efficiency mixed flow turbine, which is applicable for diesel engine turbo-chargers in ships and on land, and aims to improve the turbo charging effectiveness of an internal-combustion engine. The turbine comprises turbine blades, a hub and a wheel disc, wherein the wheel disc is a semi-open wheel disc; the blade-shaped curve of the turbine blades adopts a double equation mode; the coordinate along the shaft line direction of the turbine is shown as the right equation: in the equation, c1, b2 and c2 are undetermined coefficients of the equation, which are determined according to the maximum axial height Zm of the blades, the mounting angle beta 2p of the blades on the average diameter D2p of the turbine outlet and the subtended angle theta b of the blades; for the mixed flow turbine, in general, Zm / D1p is equal to between 0.4 and 0.5, beta 2p is equal to between 30 and 40 degrees; theta b is equal to 360 degrees / number of blades of 2 to 5 degrees; D1p is the average diameter of the turbine inlet, and D2p is equal to [(D plus D0) / 2]; and the p1, p2 and q2 are indexes of the equation, which affect the curve changing rule of the blade-shaped curve, generally, the values of the indexes of the equation are between 1.8 and 3.0.
Description
technical field [0001] The invention relates to a mixed-flow turbine, which belongs to the technical field of variable capacity machines. Background technique [0002] The turbine is a key part of the turbocharger that rotates at high temperature at high speed. Its function is to convert the exhaust gas energy of the internal combustion engine into mechanical work that drives the compressor to rotate at high speed coaxially. Common turbines have three types: axial flow, radial flow, and mixed flow. As far as the working method is concerned, the mixed flow type is a mixed mode between the axial flow type and the radial flow type. The turbocharger is more effective, but the disadvantage is that the design is difficult and prohibitive. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a high-efficiency mixed-flow turbine that can improve the effectiveness of turbocharging of in...
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IPC IPC(8): F01D5/14
Inventor 董复兴朱爱国韩国强张晋东冯云虎王鑫
Owner 大同北方天力增压技术有限公司