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Blade element theory

About: Blade element theory is a research topic. Over the lifetime, 1537 publications have been published within this topic receiving 22517 citations.


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TL;DR: In this article, a harmonic balance technique for the analysis of two-dimensional linear (small disturbance) and nonlinear unsteady flows in multistage turbomachines is presented, where each blade row is modeled using a computational grid spanning a single blade passage.
Abstract: A harmonic balance technique for the analysis of two-dimensional linear (small-disturbance) and nonlinear unsteady flows in multistage turbomachines is presented. The present method uses a mixed time-domain/frequency-domain approach that allows one to compute the unsteady aerodynamic response of multistage machines to both blade vibration (the flutter problem) and wake interaction (the forced response problem). In general, the flowfield may have multiple excitation frequencies that are not integer multiples of each other, so that the unsteady flow is (sometimes) aperiodic in time. Using our approach, we model each blade row using a computational grid spanning a single blade passage. In each blade row, we store several subtime level solutions. For flows that are periodic in time, these subtime levels span a single time period. For aperiodic flows, the temporal period spanned by these subtime level solutions is sufficiently long to sample the relevant discrete frequencies contained in the aperiodic flow. In both cases, these subtime level solutions are related to each other through the time-derivative terms in the Euler or Navier-Stokes equations and boundary conditions; complex periodicity conditions connect the subtime levels within a blade passage, and interrow boundary conditions connect the solutions among blade rows. The resulting discretized equations, which are mathematically steady because time derivatives have been replaced by a pseudospectral operator in which the excitation frequencies appear as parameters, can be solved very efficiently using multigrid acceleration techniques. In this paper, we apply the technique to both flutter and wake-interaction problems and illustrate the influence of neighboring blade rows on the unsteady aerodynamic response of a blade row.

110 citations

Journal ArticleDOI
TL;DR: In this paper, the use of material in a 2.5 m long fibreglass composite wind turbine blade is discussed. And a program was written to create a detailed finite element mesh of the blade, using design data from blade element theory and panel code predictions, in a format suitable for direct input into a commercially available finite element software package.

102 citations

Journal ArticleDOI
R. Malki1, Alison Williams1, T.N. Croft1, Michael Togneri1, Ian Masters1 
TL;DR: In this paper, a model based on blade element momentum theory is developed for the prediction of tidal stream turbine performance in the ocean environment, through the coupling of the BEM method with computational fluid dynamics, the influence of upstream hydrodynamics on rotor performance is accounted for.

99 citations

Journal ArticleDOI
TL;DR: In this article, an actuator disc model based on the Blade Element Theory is implemented for the simulation of the rotor effects, assuming a 3D, steady state flow, the Reynolds-averaged Navier-Stokes equations are solved, along with the Reynolds Stress Model to account for the anisotropy of atmospheric turbulence.

99 citations

Journal ArticleDOI
Sunil K. Sinha1
TL;DR: In this article, the effect of the rotary inertia and gyroscopic moments as a result of both shaft bending as well as staggered blades flexing in-and-out of the plane of the disk was investigated.

98 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202328
202249
202116
202012
201916
201823