Dramatic changes to aircraft design are on the horizon meet ambitious efficiency and emissions targets. This will bring about in role of aero-engines, requiring a greater degree high fidelity, coupled modelling. To bridge wide range spatial temporal scales, modern turbomachinery employs modelling fidelities during different stages for engine components. High fidelity methods such as Large Eddy Simulation (LES) have been successfully applied numerous complex flows where traditional...

Flows throughout different zones of turbines have been investigated using large eddy simulation (LES) and hybrid Reynolds-averaged Navier–Stokes-LES (RANS-LES) methods contrasted with RANS modeling, which is more typically used in the design environment. The studied cases include low high-pressure turbine cascades, real surface roughness effects, internal cooling ducts, trailing edge cut-backs, labyrinth rim seals. Evidence presented that shows LES RANS-LES produces higher quality data than...

A framework for improving cell design and providing researchers with low-cost, open-source, 3D-printed redox flow battery test cells.

In this paper, we investigate the coupled interaction between a new short intake design with modern fan in high-bypass ratio civil engine, specifically under off-design condition of high incidence. The is expected to be much more significant than that on conventional intake. performance both intake-alone and rotor-alone configurations are examined isolation. Subsequently, comprehensive understanding two-way presented. This includes effect angles attack (AoA) tolerance (FoI) circumferential...

Abstract Theoretical methods are developed to understand the effect of non-uniform grids on Flux Reconstruction (FR) in multi-dimensions. A better theoretical understanding wave angle and grid deformation is established. FR shown have a smaller variation properties than some finite difference counterparts. Subsequent numerical experiments Taylor–Green Vortex with jittered elements show localised regions expansion contraction. The this had Nodal DG-like schemes was increase dissipation,...

A finite element procedure, which includes geometric stiffening, and centrifugal Coriolis terms resulting from the use of a rotating coordinate system, has been developed to compute mode shapes frequencies structures. Special application this capability made Darrieus, vertical axis wind turbines. In parallel development effort, technique for modal testing turbine established measure parameters directly. Results predictive experimental techniques are compared over wide range rotational speeds.

Industrial legacy codes usually have had long pedigrees within companies, and are deeply embedded into design processes. As the affordability availability of computing power has increased, these found themselves pushed service as large eddy simulation solvers. The approximate Riemann solver Roe, which is frequently used core method in such codes, shown to need much user care when adopted discretisation scheme for simulation. A kinetic energy preserving (KEP) scheme—which retains same...

Strong aerodynamic coupling can make the high fidelity simulation of a number critical aero-engine components prohibitively expensive — particularly within timeframes industrial design cycles. This paper develops body force based hierarchy approaches to modelling effects blade rows. These are envisaged as allowing computationally parts coupled systems be resolved much more cheaply, rendering cost overall manageable. Simulation that exists between flow around an intake and its fan is...

Flows throughout different zones of turbines have been investigated using Large Eddy Simulation (LES) and hybrid Reynolds-Averaged Navier-Stokes-LES (RANS-LES) methods contrasted with RANS modelling, more typically used in the design environment. Cases studied include low high-pressure turbine cascades, real surface roughness effects, internal cooling ducts, trailing edge cut-backs labyrinth rim seals. Evidence is presented that shows LES RANS-LES produces higher quality data than RANS/URANS...

The paper discusses an experimental and theoretical investigation of low speed turbulent flow over transverse rigid wavy surfaces having a wavelength on the order boundary layer thickness. In addition results investigations laminar short waves long (wavelength much greater than thickness) walls are presented. Surface pressure net drag measurements obtained for symmetric asymmetric in agreed with Navier-Stokes spectral code indicated no significant reduction. Several wave configurations did...

An assessment of various automatic block topology generation techniques for creating structured meshes has been performed in the first part paper. The objective is to find out optimal blocking methods generating suitable flow simulations. comparison carried using an adjoint-based error analysis generated by these topologies. Different functions and numerical schemes have used this assessment. It found that, general, medial axis-based approaches provide yields better accuracy computing...

The measurement accuracy of the temperature/pressure probe mounted at leading edge a turbine/compressor blade is crucial for estimating fuel consumption turbo-fan engine. Apart from error itself, also introduces extra losses. This again would compromise overall engine efficiency. paper utilizes high-fidelity numerical analysis to understand complex flow around and quantify loss sources due interaction between its instrumentation. With inclusion leading-edge probes, three-dimensional...

Intakes of reduced length have been proposed with the aim producing aero-engines higher efficiency and weight. As intake decreases, it is expected that stronger effects fan on flow over lip will be seen. If cannot ignored, a low-cost but still accurate model great importance for designing short-intake. In this paper, low order rotor/stator model, immersed boundary method smeared geometry (IBMSG), has further developed validated rig test case. The improved IBMSG more robust than original....

Preprocessing remains one the main bottlenecks in computational fluid Dynamics simulations of flows involving complex geometries as advances algorithm development, turbulence modelling and parallel computing are made. To this end, two approaches presented here to efficiently deal with order reduce preprocessing time manual effort. First, a hybrid blocking approach, combining medial axis-based method level set iso-surface is aid block topology generation for subsequent structured meshing 3D...

Labyrinth seals are extensively used in gas turbines to control leakage between components. In this research, the effects of geometry on sealing performance investigated. To obtain best performance, an investigation is undertaken into possibility optimising labyrinth seal planforms using a genetic algorithm (GA). Large Eddy Simulation (LES) for its ability accurately capture complex unsteady behaviour type flow. Three hundred LES calculations carried out. By making use large number...

Filtering is often used in Large Eddy Simulation with a global filter width, instead here width the reference domain of high order Flux Reconstruction considered.It shown via Von Neumann analysis how filtering effects dispersion and dissipation scheme when spatially temporally discretised.With it being that stabilises by upto 25% for forth FR.The impact on error production calculated, highlighting reduction convective velocity caused showing numerically accuracy.Finally, turbulent...

Abstract Leading edge instrumentation used in compressor and turbine blades for jet-engine test rigs can cause significant obstruction lead to a marked increase downstream pressure loss. Typical such scenario could be Kiel-shrouded probe with either thermocouple or pitot-static tube temperature/pressure measurement. High fidelity analysis of coupled blade requires the generation high-quality mesh which take amount an engineers time. The application immersed boundary method (IBM) large eddy...

Diffusing S-shaped ducts can be important components in the integration of aero-engines and airframe design. Wellborn et al., at Internal Fluid Mechanics Facility NASA Lewis Research Centre, conducted a comprehensive experimental study diffusing S-duct Here, range computational methods are applied to geometry that was used this experiment, along with two more on geometrically similar experiments which were ONERA. Some RANS turbulence closure models found effective few cases for predicting...

Previous attempts have been made to optimize the performance of film-cooling slots for cutback trailing edges, but these involved use steady calculation methods, which shown be inappropriate accurately capturing behavior this class flows. Here, an unsteady method (large-eddy simulation on a coarse grid, or very large-eddy simulation) is used compute flow. To take advantage enormous parallel capacity modern supercomputers and distributed computing nets, as well relatively low cost simulation,...

The measurement accuracy of the temperature/pressure probe mounted at leading edge a turbine/compressor blade is crucial for estimating fuel consumption turbo-fan engine. Apart from error itself, also introduces extra losses. This again would compromise overall engine efficiency. paper utilizes high-fidelity numerical analysis to understand complex flow around and quantify loss sources due interaction between its instrumentation. With inclusion probes, three dimensional phenomena develop,...