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Institute of Turbomachinery and Fluid Dynamics
Logo Leibniz Universität Hannover
Institute of Turbomachinery and Fluid Dynamics
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Turbomachinery Design

Field of Application

    • Axial Turbomachines: Fans, compressors, turbines, diffusors
    • Centrifugal Turbomachines:  Compressors, turbines, inlet guide vanes, volutes, diffusors

    Description

    The common design process of turbomachinery can be divided into multiple design steps. This design process is given in Figure 1. Additionally, Figures 2-5 exemplify this design process of a variable inlet guide vane for turbocharger applications.

    At first, the basic machine type is defined in the preliminary design using dimensionless parameters. Thereby the basic dimensions (e.g. size, rotational speed, stage number, etc.) can be determined using similarity laws to transfer the technical findings of existing machines to the current case. Subsequently, a detailed examination of the performance of the turbomachine is made on the basis of empirical loss correlations. This yields the basic performance charts and an estimate of the achievable efficiency.

    In the detailed design phase, the geometry of the turbomachine is concretized and the 3-dimensional contour is generated. This detailed geometry is subjected to 3D flow- and strength analysis. The evaluation of these results allows the identification of improvement opportunities, which can then be introduced into the process chain.

    After the performance improvement cycle has been reiterated to an acceptable level, a prototype can be manufactured to allow experimental examination of the machine. The results of this investigation can then be used for the improvement of the design tools to make their performance predictions more precise.  

    Several tools for preliminary design and performance prediction are available at the TFD. These tools can be classified into commercial programs, and programs developed at the TFD. The commercial programs have the benefit that they have shown their validity due to their use in the industry for many years. Examples for these programs are the products of CONCEPTS NREC, ANSYS and Numeca. Additionally the TFD possesses own programs for the preliminary design and the performance prediction of turbomachines. These programs feature the possibility to inspect and modify the source code, to adjust the program to the demands of the individual machine.

       Design Tools Available at the TFD:

      • Preliminary design:

        • CONCEPTS NREC
        • Vista, ANSYS
        • Preliminary and performance prediction tools developed at the TFD

      • Detailed design:

        • CONCEPTS NREC
        • BladeGen, ANSYS
        • Autoblade/ Fine Design 3D, NUMECA
        • Solid Edge
        • NX 8
        • PTC Creo
        • Solid Works

       

      Contact

      Markus Schödel, M.Sc.