Jayakrishnan Radhakrishnan

• Manipal Institute of technology

Co-rotating, counter, and contra-rotating Vertical Axis Wind Turbines (VAWTs) offer higher power yields than singular turbines due to synergetic interactions, making them ideal for rooftop applications. This study focuses on enhancing the efficiency of a Contra-Rotating VAWT (CR-VAWT) using a ducted airborne configuration. A wind gathering device (...

Leading-edge tubercles, inspired by the flippers of humpback whales, are widely adopted passive flow control devices to enhance the aerodynamic performance of various lifting surfaces. This experimental study investigates the implementation of sinusoidal and triangular tubercles on H-type Vertical Axis Wind Turbine blades to analyze their effects o...

Amongst the various natural and readily available renewable energy sources, wind has been one of the most sought-after sources for energy generation due to its virtually inexhaustible nature and availability over vast geographical areas. The rise in urbanization and the development of high-rise buildings have shown great potential for local wind po...

With Vertical Axis Wind Turbines (VAWTs) showing promising capabilities in the recent years, lately there has been an increase inresearch towards the performance enhancements of said VAWTs, respectively. The following study emphasizes on the conceptual design optimization of a Contra-Rotating VAWT (CR-VAWT) using Taguchi method and CFD. Using the T...

The study of insect-inspired flapping robo drones is exciting and ongoing, but creating realistic artificial flapping robots that can effectively mimic insect flight is difficult due to the transmission mechanism's need for lightweight and minimal connecting components. The objective of this work was to create a system of constructing a flapping su...

Insect RoboFlyers are interesting and active focuses of study but producing high-quality flapping robots that replicate insect flight is challenging., due to the dual requirement of both a sophisticated transmission mechanism with light weight and minimal intervening connections. This innovative mechanism was created to address the need for a produ...

In recent days, enhancement of Vertical Axis Wind Turbines (VAWTs) by mitigating flow deteriorating effects like dynamic stalling, unsteady wake is given great importance. The following article focuses on implementing four different tubercles on the blades’ leading edge and studying its performance and flow characteristics using CFD techniques. Res...

The ability of Horizontal & Vertical Axis Wind Turbine (HAWT & VAWT) to harness the incoming wind is limited due to several factors such as structural constrains, fatigue problems, geographical and ecological issues, noise pollution, vibrational & acoustic losses. Diffuser Augmented Wind Turbine (DAWT) exploits the concepts of velocity augmentation...

Implementing small and medium sized vertical axis wind turbines (VAWT) in rural and urban regions is of focus for many countries including India. Counter rotating vertical axis wind turbine is relatively simple in design and has better aerodynamic performance compared to conventional VAWT. This paper computationally investigates the performance of...

Objective of review is to study tyre aerodynamics which aims to reduce emissions, fuel intake and to improve the efficiency of automobiles. Tyre is one of the most essential part of vehicle as it plays a major part in ensuring safety of the vehicle, aerodynamics of a rotating tyre contributes about 33% of total vehicle drag. Decrease in drag can le...

The impetus towards sustainable energy production and energy access has led to considerable research and development on decentralized generators, in particular diffuser-augmented wind turbines. This paper aims to characterize the performance of diffuser-augmented wind turbines (DAWTs) using high-lift airfoils employing a three-step computational an...

Diffuser Augmented Wind Turbines(DAWTs) offers more energy efficient of production of wind power as compared to conventional wind turbines. In this article, the mass flow rate of air through the diffuser is increased by addition of slits at the inlet section and designing of the diffuser is done using airfoils. The Reynolds Averaged Navier Stokes E...

Fossil fuel is the major source of energy and is a fast depleting resource. The phenomenal increase in fossil fuel consumption has adversely affected carbon footprint impacting our environment. With strict environmental regulations in place, the focus towards renewable sources of energy is gaining momentum supported by recent advancement in technol...

Diffuser Augmented Wind Turbines (DAWTs) are used in harnessing of wind energy in a more efficient way compared to the conventional wind turbines. In this article, the mass flow rate through the shroud is increased by the addition of flanges at the aft of the shroud. Using Reynolds Averaged Navier Stokes Equation along with k-ω SST turbulence model...

Diffuser Augmented Wind Turbines(DAWTs) offers more energy efficient of production of wind power as compared to conventional wind turbines. In this article, the mass flow rate of air through the diffuser is increased by addition of slits at the inlet section and designing of the diffuser is done using airfoils. The Reynolds Averaged Navier Stokes E...

Abstract. The present study aims to analyze the basic aerodynamic performance of a Diffuser Augmented Wind Turbine (DAWT) using high lift generating airfoils in the diffuser cross-section that encloses the turbine. The study is a Computational Fluid Dynamics (CFD) analysis of the flow across the rotor blades and through the diffuser, which is carri...

Diffuser Augmented Wind Turbines (DAWTs) are an efficient method of harnessing wind power compared to conventional wind turbines. This article mainly focuses on the design and analysis of diffuser casing of various with various design parameters. Reynolds Averaged Navier Stokes equations in conjunction with k-ω SST turbulence model was used to anal...

Stability analysis of a lighter-than-air wind energy system is carried out by solving the Reynolds Averaged Navier-Stokes (RANS) equations in two dimensions using commercial CFD solver ANSYS Fluent. Not disregarding experimental and high fidelity methods, the present analysis is characterized by a low computational cost and high accuracy. The light...

The present study aims to asses the aerodynamic performance of Diffuser Augmented Wind Turbine (DAWT) using high lift generating airfoils in the construction of the shroud/diffuser. The study is a Computational Fluid Dynamics (CFD) analysis which is carried out using Reynolds Averaged Navier-Stokes (RANS) simulations. The flow across the duct and r...

An overview of the Lattice Boltzmann Method has been presented with an in house algorithm for the numerical simulation of fluid flow around a circular cylinder. The linearization of the collision operator has been discussed for distributions not close to the local equilibrium state, and numerical simulation has been carried out for stable initial c...

Horizontal axis wind turbines (HAWTs) are scaled down to incorporate rotor blades that usually have a diameter ranging from two to four meters in length. A common misconception with regard to selection of airfoils followed by subsequent designing of rotor blades involves the use of NACA airfoils and other conventional high Reynolds number airfoils....

The ideal supersonic intake was designed using the Theta-Beta-Mach relations and a CAD modelling software. After the design was done the optimization part was carried out. Initially the easy method of cowl deflection angle variation was used to get the optimum results at a particular angle and then the pressure recovery was maximized using the inta...