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Aerodynamic Inverse Design Of Multistage Turbomachinery Blading
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Book Synopsis Aerodynamic Inverse Design of Multistage Turbomachinery Blading by : Benedikt Roidl
Download or read book Aerodynamic Inverse Design of Multistage Turbomachinery Blading written by Benedikt Roidl and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A recently developed inverse method for single blade rows is extended to 2-D and quasi 3-D multi-stage application. In that method, the pressure distribution on the blade surfaces or alternatively, the blade loading and their thickness distribution are specified and the blade shape is sought using a virtual wall movement. The blade walls move with a virtual velocity distribution that is derived from the difference between the current and the target pressure distribution on the blade surfaces. The scheme is fully consistent with the viscous flow assumption and it is implemented into the time accurate solution of the Reynolds-Averaged Navier-Stokes equations that are expressed in an arbitrary Lagrangian-Eulerian (ALE) form to account for mesh movement. A cell-vertex finite volume method of the Jameson type is used to discretize the equations in space; time accurate integration is obtained using dual time stepping. An algebraic Baldwin-Lomax turbulence model is used for turbulence closure. In order to extend the present method to multistage applications a mixing plane approach using flux averaged flow conditions is employed to couple the vane (stator) and blade (rotor) regions and non-reflecting boundary conditions are implemented at the interface between the two regions to account for short distances between blade leading and trailing edges and the corresponding inlet and exit boundaries. The method is validated on two different cases. Finally three different stages are redesigned: The E/TU-3 single stage turbine, the E/TU-4 2.5 stage turbine and the E/CO-5 2.5 stage compressor. For all cases presented in this thesis the blade pressure distributions and pressure loadings, respectively were selected as design variables, and, by modifying the original profile, it was possible to improve the aerodynamic performance.
Book Synopsis Aerodynamic Inverse Design of Turbomachinery Blading in Two-dimensional Viscous Flow by : Kasra Daneshkhah
Download or read book Aerodynamic Inverse Design of Turbomachinery Blading in Two-dimensional Viscous Flow written by Kasra Daneshkhah and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic Design and Optimization of Turbomachinery Blading by : Temesgen Teklemariam Mengistu
Download or read book Aerodynamic Design and Optimization of Turbomachinery Blading written by Temesgen Teklemariam Mengistu and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamic shape optimization of gas turbine blades is a very challenging task, given e.g. the flow complexity, the stringent performance requirements, the structural and manufacturing constraints, etc ... This work addresses the challenge by automating the optimization process through the development, implementation and integration of state-of-the-art shape parametrization, numerical optimization methods, Computational Fluid Dynamics (CFD) algorithms and computer architectures. The resulting scheme is successfully applied to single and multi-point aerodynamic shape optimization of several cascades involving two-dimensional transonic and subsonic, viscous and inviscid flow in compressor and turbine cascades. The optimization objective is to achieve a better aerodynamic performance, subject to aerodynamic and structural constraints, over the full operating range of gas turbine cascades by varying the blade profile. That profile is parameterized using a Non-Uniform Rational B-Splines (NURBS) representation, which is flexible accurate and capable of representing the blade profiles with a relatively small number of control points for a given tolerance. The NURBS parameters are then used as design variables in the optimization process. The optimization objective is determined from simulating the flow using an in-house CFD code that solves the two-dimensional Reynolds-Averaged Navier-Stokes (or Euler) equations using a cell-vertex finite volume method on an unstructured triangular mesh and turbulence is modeled using the Baldwin-Lomax model. To save computing time significantly, Artificial Neural Network (ANN) is used to build a low fidelity model that approximates the optimization objective and constraints. Moreover, to reduce the computing wall-clock time, the optimization scheme was parallelized on an SGI ALTIX 3700 machine using Message Passing Interface (MPI), resulting in a parallelization efficiency of almost 100%. Different numerical optimization methods (genetic algorithm, simulated annealing and sequential quadratic programming) were developed, tested and implemented for the different parts of this work. The present choice of objective function and optimization methodology results in a significant improvement in performance for all the cascades that were optimized, without violating the design constraints. The use of ANN results in a ten-fold speed-up of the design process and the scheme parallelization allows for further reduction of the wall-clock time.
Book Synopsis Aerodynamic Inverse Design of Transonic Turbomachinery Cascades by : Majīd Aḥmadī
Download or read book Aerodynamic Inverse Design of Transonic Turbomachinery Cascades written by Majīd Aḥmadī and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An aerodynamic inverse design method for turbomachinery cascades is presented and is implemented in a finite volume method. In this design method, the mass-averaged swirl schedule and the blade thickness distribution are prescribed. The design method then provides the blade shape that would accomplish this loading by imposing the appropriate pressure jump across the blades and satisfying the blade boundary condition, the latter implies that the flow is tangent to the blade surfaces. This inverse design method is implemented using a cell-vertex finite volume method which solves the Euler equations on unstructured triangular meshes. A five-stage Runge-Kutta pseudo-time integration scheme is used to march the solution to steady state. Non-linear artificial viscosity is added to eliminate pressure-velocity decoupling and to capture shocks. Convergence is accelerated using local time stepping and implicit residual smoothing. The boundary conditions at inflow and outflow are based on the method of characteristics. The finite volume discretization method is validated against some standard cases of internal flow as well as linear cascades. The inverse design method is first validated for three different cascades namely, a parabolic cascade, a compressor cascade and a turbine inlet guide vane. It is then used to obtain a shock-free design of an impulse transonic cascade and of the ONERA transonic compressor cascade. A parametric study has shown that the blade profile is rather sensitive to the prescribed loading distributions and that, in most cases, a smooth loading distribution results in a shock-free cascade design.
Book Synopsis Aerodynamic Inverse Design of Transonic Turbomachinery Cascades by :
Download or read book Aerodynamic Inverse Design of Transonic Turbomachinery Cascades written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic Design of Turbomachinery Blading Three-dimensional Flow: an Application to Radial Inflow Turbines by : Massachusetts Institute of Technology. Gas Turbine Laboratory
Download or read book Aerodynamic Design of Turbomachinery Blading Three-dimensional Flow: an Application to Radial Inflow Turbines written by Massachusetts Institute of Technology. Gas Turbine Laboratory and published by . This book was released on 1991 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic Design of Turbomachinery Blading for Arbitrary Swirl Distribution by : Yi-Lung Yang
Download or read book Aerodynamic Design of Turbomachinery Blading for Arbitrary Swirl Distribution written by Yi-Lung Yang and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inverse Design of Turbomachinery Blading for Arbitrary Blade Thickness in Three-dimensional Transonic Flow by : Y. L. Lang
Download or read book Inverse Design of Turbomachinery Blading for Arbitrary Blade Thickness in Three-dimensional Transonic Flow written by Y. L. Lang and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Orlando, FL, Jun 2 - Jun 5, 1997.
Book Synopsis Aerodynamic Design of Turbomachinery Blading in Inlet Shear Flows by : Yi-Lung Yang
Download or read book Aerodynamic Design of Turbomachinery Blading in Inlet Shear Flows written by Yi-Lung Yang and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic analysis of multistage turbomachinery flows in support of aerodynamic design, ASME 99-GT-80 by : John J. Adamczyk
Download or read book Aerodynamic analysis of multistage turbomachinery flows in support of aerodynamic design, ASME 99-GT-80 written by John J. Adamczyk and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Indianapolis, Indiana, June 7-June 10, 1999.
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781792948770 Total Pages :32 pages Book Rating :4.9/5 (487 download)
Book Synopsis Three-Dimensional Flow in Radial Turbomachinery and Its Impact on Design by : National Aeronautics and Space Adm Nasa
Download or read book Three-Dimensional Flow in Radial Turbomachinery and Its Impact on Design written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-03 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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...
Download or read book Research & Technology 2002 written by and published by DIANE Publishing. This book was released on with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three-dimensional Inverse Method for Turbomachinery Blading Design by : Alain Demeulenaere
Download or read book Three-dimensional Inverse Method for Turbomachinery Blading Design written by Alain Demeulenaere and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine and Aeroengine Congress &Exhibition Birmingham, UK - June 10-13, 1996.
Book Synopsis Unsteady Aerodynamics & Aeromechanics of Multi-Stage Turbomachinery Blading by :
Download or read book Unsteady Aerodynamics & Aeromechanics of Multi-Stage Turbomachinery Blading written by and published by . This book was released on 2002 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: An integrated experiment-theory approach included collaboration between Pratt & Whitney, Duke University, and Purdue University. A benchmark-standard multistage transonic research compressor was developed by modifying the Purdue High-Speed Axial Compressor to feature new IGV and stator rows representative of modern high pressure compressors. A quantitative understanding and predictive capability for multi-stage blade row forced response was developed by analytically and experimentally investigating the fundamental flow phenomena. Experiments at Purdue investigated and quantified the interacting blade row unsteady aerodynamics and resulting vane vibration and stress response. Duke University developed a new computationally efficient unsteady aerodynamic analysis of multistage flows associated with flutter and forced response. The inherently small damping of complex higher order modes was addressed by investigating techniques to control the flow induced vibrations. The issue of robustness was also considered.
Download or read book The Republic of Nicaragua written by and published by . This book was released on 1977 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NAS Technical Summaries: Numerical Aerodynamic Simulation Program, March 1991 - February 1992 by :
Download or read book NAS Technical Summaries: Numerical Aerodynamic Simulation Program, March 1991 - February 1992 written by and published by . This book was released on 1992 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Blading Design for Axial Turbomachines by :
Download or read book Blading Design for Axial Turbomachines written by and published by . This book was released on 1989 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lecture series deals with two main topics - design methods and their principles, limitations an application to axial compressors and turbines, experience.
