Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"Annular Combustor"”.
-
Heat Transfer and Flow Characteristic Study in a Low Emission Annular Combustor
Modern Dry Low Emissions (DLE) combustors are characterized by highly swirling and expanding flows that makes the convective heat load on the combustor liner gas side difficult to predict and estimate. A coupled experimental-numerical study of swirling flow and its effects on combustor liner heat …
-
Heat Transfer and Flow Measurements in Gas Turbine Engine Can and Annular Combustors
… radial swirler performance in a gas turbine can combustor was conducted by investigating the correlation between combustor flow field geometry and convective heat transfer at cold flow conditions for Reynolds numbers of 50,000 and 80,000. Flow velocities were measured using Particle Image …
-
3D Numerical Simulation to Determine Liner Wall Heat Transfer and Flow through a Radial Swirler of an Annular Turbine Combustor
… heat transfer characteristics of a gas turbine annular combustor with radial swirlers, over a Reynolds number range from 50,000 to 840,000. A three dimensional hybrid mesh of around twenty five million cells is created for a periodic section of an annular combustor with a single radial swirler. …
-
Sensitivity analysis and optimization in low order thermoacoustic models
… different configurations: a Rijke tube, a choked combustor, a longitudinal combustor, a generic lean premix prevaporized annular combustor and the laboratory scale annular combustor built in Cambridge University Engineering Department. The continuous and discrete adjoint equations for the low …
-
Transient Phenomena in Annular Combustors
… transient phenomena related to the operation of annular gas turbine combustors, namely ignition and blow-off. The experiments were conducted on complex multi-burner geometries, close to realistic combustors, to provide a wide data set including stability limits, flame regimes and physical …
-
Computational Fluid Dynamics Investigation of Oscillatory Behaviour in Annular Combustors
… been undertaken on predicting this behaviour in annular combustors. The complexity of the annular design can give rise to an additional set of intricate oscillations due to the presence of interactions between neighbouring flames. The project is concerned with capturing trends in oscillatory …
-
Influence of Fuel Inhomogeneity and Stratification Length Scales on Detonation Wave Propagation in a Rotating Detonation Combustor (RDC)
… over the traditional constant pressure combustor. These detonation-based engines are also known as Pressure Gain Combustion systems (PGC) and Rotating Detonation Combustor (RDC) is a form of PGC, in which the detonation wave propagates azimuthally around an annular combustor. Prior …
-
Shape optimization for thermoacoustic instability with an adjoint Helmholtz solver
… heated Rijke tube and a turbulent swirl combustor in 2D. Both systems exhibit an unstable longitudinal mode. We parametrize the shapes using B-splines, calculate the shape derivatives and apply the most stabilizing changes until we make the systems stable. We then study the case of a 30kW …
-
Shape Optimization of Annular Combustors with an Open Source Parallelized Thermoacoustic Helmholtz Solver
Thermoacoustic instability occurs in gas turbine combustors due to the dynamic coupling between heat release rate and acoustic oscillations. If the unsteady heat release rate is sufficiently in phase with the acoustic pressure, then the amplitude of the acoustic pressure intensifies. This increases …
-
Real-time data assimilation in nonlinear dynamical systems
… thermoacoustics of a hydrogen-based laboratory combustor using data from raw sensors’ measurements (which may be subject to measurement bias). We generalize the bias-regularized ensemble Kalman filter (r-EnKF) to infer both biases in the model and in the measurement, and we design an echo state …