A Design Study of Radial Inflow Turbines with Splitter Blades in Three-dimensional Flow PDF Download
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Author: William Djaja Tjokroaminata
Publisher:
ISBN:
Category :
Languages : en
Pages : 240
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Author: William Djaja Tjokroaminata
Publisher:
ISBN:
Category :
Languages : en
Pages : 240
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Book Description
Author: Yi-Lung Yang
Publisher:
ISBN:
Category :
Languages : en
Pages : 316
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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781792948770
Category :
Languages : en
Pages : 32
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Book Description
In the two papers on the 'Theory of Blade Design for Large Deflections' published in 1984, a new inverse design technique was presented for designing the shape of turbomachinery blades in three-dimensional flow. The technique involves the determination of the blade profile from the specification of a distribution of the product of the radius and the pitched averaged tangential velocity (i.e., r bar-V(sub theta), the mean swirl schedule) within the bladed region. This is in contrast to the conventional inverse design technique for turbomachinery blading in two dimensional flow in which the blade surface pressure or velocity distribution is specified and the blade profile determined as a result; this is feasible in two-dimensional flow because the streamlines along the blade surfaces are known a priori. However, in three-dimensional flow, the stream surface is free to deform within the blade passage so that the streamlines on the blade surfaces are not known a priori; thus it is difficult and not so useful to prescribe the blade surface pressure or velocity distribution and determine the resulting blade profile. It therefore seems logical to prescribe the swirl schedule within the bladed region for designing a turbomachinery blade profile in three-dimensional flow. Furthermore, specifying r bar-V(sub theta) has the following advantages: (1) it is related to the circulation around the blade (i.e., it is an aerodynamic quantity); (2) the work done or extracted is approximately proportional to the overall change in r bar-V(sub theta) across a given blade row (Euler turbine equation); and (3) the rate of change of r bar-V(sub theta) along the mean streamline at the blade is related to the pressure jump across the blade and therefore the blade loading. Since the publications of those two papers, the technique has been applied to the design of a low speed as well as a high speed radial inflow turbine (for turbocharger applications) both of which showed definite improvements...
Author: Massachusetts Institute of Technology. Gas Turbine Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages : 65
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Author: Mehrdad Zangeneh
Publisher:
ISBN:
Category : Turbines
Languages : en
Pages : 0
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This paper is concerned with the design of a high speed, 5 inch diameter radial-inflow turbine for medium-sized diesel engine turbocharger applications. The turbine was designed by a newly developed fully three dimensional compressible inverse design method, in which the blade shapes are computed for a specified distribution of rV̄ø. The designed blades had non-radial blade filaments and therefore the impeller was carefully analyzed for its structural integrity. This was achieved by the iterative use of a three dimensional structural and vibration analysis program and the design method. The impeller was made by a casting process. The performance of the new impeller was measured and then compared with three other impellers, one conventional and two experimental. The new impeller performed substantially better than all the baseline turbines and showed a 5.5% improvement in the total-to-static efficiency over the conventional turbine, 2.5% of which was attributable to the aerodynamically superior blade shape computed by the three dimensional inverse design method. The improvement in efficiency was not just confined to the design point and an appreciable improvement could be observed at off-design conditions.
Author: M. Zangeneh-Kazemi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 496
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Author: M. Zangeneh-Kazemi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 504
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Author: Mehrdad Zangeneh
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 0
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Book Description
A fully three dimensional compressible inverse design method for the design of radial and mixed flow machines is described. In this method the distribution of the circumferentially averaged swirl velocity, or r V̄ Ø on the meridional geometry of the impeller is prescribed and the corresponding blade shape is computed iteratively. Two approaches are presented for solving the compressible flow problem. In the approximate approach, the pitchwise variation in density is neglected and as a result the algorithm is simple and efficient. In the exact approach, the velocities and density are computed throughout the three dimensional flow field by employing Fast Fourier Transform in the tangential direction. The results of the approximate and exact approach are compared for the case of a high speed (subsonic) radial-inflow turbine and it is shown that the difference between the blade shapes computed by the two methods is well within the manufacturing tolerances. The flow through the designed impeller is analysed by using three dimensional inviscid and viscous time marching programs and very good correlations between the specified and computed r V̄ Ø is obtained.
