A blackbox optimization of volumetric heating rate for reducing the wetness of the steam flow through turbine blades

Optimization of the Pitch to Chord Ratio for a Cascade Turbine Blade in Wet Steam Flow

Offshore wind energy is a sustainable renewable energy source that is acquired by harnessing the force of the wind offshore, where the absence of obstructions allows the wind to travel at higher and more steady speeds. Offshore wind has recently grown in popularity because wind energy is more powerful offshore than on land. Prior to the development of floating structures, wind turbines could not be deployed in particularly deep or complicated seabed locations since they were dependent on fixed structures. With the advent of floating structures, which are moored to the seabed using flexible anchors, chains, or steel cables, wind turbines can now be placed far offshore. The deployment of floating wind turbines in deep waters is encouraged by several benefits, including steadier winds, less visual impact, and flexible acoustic noise requirements. A thorough understanding of the physics underlying the dynamic response of the floating offshore wind turbines, as well as various design principles and analysis methods, is necessary to fully compete with traditional energy sources such as fossil fuels. The present work offers a comprehensive review of the most recent state-of-the-art developments in the offshore wind turbine technology, including aerodynamics, hydromechanics, mooring, ice, and inertial loads. The existing design concepts and numerical models used to simulate the complex wind turbine dynamics are also presented, and their capabilities and limitations are discussed in detail.

https://www.mdpi.com/1996-1073/16/1/2/pdf?version=1671778577

Floating Offshore Wind Turbines: Current Status and Future Prospects

Optimization of the Trailing Edge Inclination of Wet Steam Turbine Stator Blade Towards the Losses Reduction

New knowledge in multidisciplinary methodology is presented in this article for the design, aerodynamic optimization, and model validation of an adaptive wing prototype. The optimization framework integrates the design, the finite element analysis, and the model validation. A computational fluid dynamics model of the adaptive wing and the flow in its vicinity was developed and validated with experimental metrics, such as the lift, the drag, and the lift-to-drag ratio. A new genetic algorithm strategy was chosen to find the optimized airfoil shapes for the prototype’s upper surface. The reliability of the proposed methodology was investigated through the design, manufacture, and testing of a wing prototype proposed for the UAV S45. The experimental and simulated results have shown a low drag production and a high lift-to-drag ratio of the adaptive wing prototype that will translate into a reduction in fuel consumption and an increase in cruising flight range and therefore into climate improvement.

/pdf/new-validation-methodology-of-an-adaptive-wing-for-uav-s45-23xwp5a8.pdf

New Validation Methodology of an Adaptive Wing for UAV S45 for Fuel Reduction and Climate Improvement

Energy Loss on Fractional Deposition in Last Stages of Condensing Steam Turbine due to Blade Shape and Moisture Droplet Size

Abstract Electric vertical take-off and landing (eVTOL) aircraft with multiple lifting rotors or prop-rotors have received significant attention in recent years due to their great potential for next-generation urban air mobility (UAM). Numerical models have been developed and validated as predictive tools to analyze rotor aerodynamics and wake dynamics. Among various numerical approaches, the vortex method is one of the most suitable because it can provide accurate solutions with an affordable computational cost and can represent vorticity fields downstream without numerical dissipation error. This paper presents a brief review of the progress of vortex methods, along with their principles, advantages, and shortcomings. Applications of the vortex methods for modeling the rotor aerodynamics and wake dynamics are also described. However, the vortex methods suffer from the problem that it cannot deal with the nonlinear aerodynamic characteristics associated with the viscous effects and the flow behaviors in the post-stall regime. To overcome the intrinsic drawbacks of the vortex methods, recent progress in a numerical method proposed by the authors is introduced, and model validation against experimental data is discussed in detail. The validation works show that nonlinear vortex lattice method (NVLM) coupled with vortex particle method (VPM) can predict the unsteady aerodynamic forces and complex evolution of the rotor wake. 

https://aia.springeropen.com/track/pdf/10.1186/s42774-022-00111-3

Review of vortex methods for rotor aerodynamics and wake dynamics

The discrepancy between Navier Stokes Fourier-based CFD and aero thermodynamic flight test data becomes noticeable from altitudes above 50 km. It is argued that this gap is due to the shortcomings of the conventional Navier-Stokes-Fourier model. To investigate the cause of the shortcomings, we revisited the derivation of the continuum models from the Boltzmann-Curtiss kinetic equations for diatomic and polyatomic gases. We investigated the effects of bulk viscosity, vibrational energy, and rarefaction on the hypersonic flow around a two-dimensional cylinder and supersonic flow past a cavity. In addition, we analyzed the flow field in detail using a new complete compressible vorticity transport equation including the bulk viscosity. 

Bidesh Sengupta

Papers

Energy Loss on Fractional Deposition in Last Stages of Condensing Steam Turbine due to Blade Shape and Moisture Droplet Size

Review of vortex methods for rotor aerodynamics and wake dynamics

Review of vortex methods for rotor aerodynamics and wake dynamics

Effects of bulk viscosity, vibrational energy, and rarefaction on flow and vorticity fields around simple bodies at hypersonic speeds