This paper investigates the dynamics of an electromagnetic vortex bladeless wind turbine (VBWT) with a tunable mechanism. The tunable mechanism comprises a progressive-rate spring that is attached to an oscillating magnet inside an electromagnetic coil. The spring stiffness is progressively adjusted as the wind speed changes to tune the turbine fundamental frequency to match the shedding frequency of the vortex-induced vibration (VIV) due to the wind flow crossing over the oscillating mast. Coupled nonlinear equations of motion of the tunable turbine are developed using the lumped-mass representation and Lagrange formulation. Numerical results show that the tunable turbine performs effectively beyond a threshold wind speed. An analytical expression of the threshold speed is derived based on the mechanical fundamental frequency of the turbine. The analytical results are in reasonable agreement with the numerical evaluations. At a given wind speed past the threshold, the tunable turbine has an optimum spring stiffness at which the output power is maximum. Numerical studies also show that the output power of the 2 m long tunable turbine is tens of times larger in comparison to a conventional bladeless turbine. For example, at a wind speed of 4.22 m/s, the output rms power of the tunable turbine is around 1105 mW versus 17 mW of the conventional VBWT. The power can be further maximized at an optimum external load. This research work demonstrated the feasibility and merits of the proposed tunable mechanism to enhance the overall performance of the bladeless wind turbine.
This paper investigates the dynamics of an electromagnetic vortex bladeless wind turbine (VBWT) with a tunable mechanism. The tunable mechanism comprises a progressive-rate spring that is attached to an oscillating magnet inside an electromagnetic coil. The spring stiffness is progressively adjusted as the wind speed changes to tune the turbine fundamental frequency to match the shedding frequency of the vortex-induced vibration (VIV) due to the wind flow crossing over the oscillating mast. Coupled nonlinear equations of motion of the tunable turbine are developed using the lumped-mass representation and Lagrange formulation. Numerical results show that the tunable turbine performs effectively beyond a threshold wind speed. An analytical expression of the threshold speed is derived based on the mechanical fundamental frequency of the turbine. The analytical results are in reasonable agreement with the numerical evaluations. At a given wind speed past the threshold, the tunable turbine has an optimum spring stiffness at which the output power is maximum. Numerical studies also show that the output power of the 2 m long tunable turbine is tens of times larger in comparison to a conventional bladeless turbine. For example, at a wind speed of 4.22 m/s, the output rms power of the tunable turbine is around 1105 mW versus 17 mW of the conventional VBWT. The power can be further maximized at an optimum external load. This research work demonstrated the feasibility and merits of the proposed tunable mechanism to enhance the overall performance of the bladeless wind turbine.
Warm, soft, and rich, nothing beats a piece of this homemade naan bread recipe alongside your favorite rich curry.
If you're aiming to eat healthier and shed pounds without losing out on taste or battling hunger, low-calorie, high-protein meals could be your solution! This post will guide you through 25 effortless and scrumptious recipes that are both low in calories and high in protein. These meals will simplify sticking to a nutritious diet and keep you satisfied!
This recipe for the Perfect Oven Pot Roast, in fact, is the perfect meal. The meat is slow cooked in the oven with carrots and onions until the meat is fall-apart-tender and the carrots are tender crisp.
You need to try these healthy high protein meal prep lunch ideas to up your daily protein intake while eating delicious and satisfying meals!
Hier findest du 25 Rezepte für die Heißluftfritteuse. Schnapp dir deinen Air Fryer und probier dich durch!
This is 10 Supercute FREE Amigurumi Dog Crochet Patterns that's easy to follow and very beginner friendly! These patterns are perfect for every child and will be their best friend! Most of the patterns use a soft yarn that's perfect for a baby to cuddle with the dog. These Dog patterns are some of my
Indulge in the rich and hearty flavors of authentic Ukrainian Borscht. Allow those delicious red beets come to life! And learn the secrets to creating a bowl of soup that will transport you directly to the heart of Ukraine.
These Panko Crusted Chicken Breasts are perfectly crunchy on the outside and juicy and tender on the inside.
Simple and delicious homemade roasted tomato sauce from fresh tomatoes
With just a few simple ingredients, you can create beautiful and delicious charcuterie boards for beginners that everyone will love.
16 Make-Ahead Cold Lunch Ideas to Prep for Work This Week - Try prepping these awesome cold lunch ideas when you can't reheat your lunch!
Easy Red Enchilada Sauce is made with just a few simple ingredients, and is more flavorful and healthier than the canned stuff!
Facile et délicieuse cette quiche Lorraine est composée d'une pâte brisée, d'œufs, de crème fraiche et de lardons fumés. Recette facile.
Lentil curry is one of our best lentil recipes as it’s easy to make, it can be frozen for those lazy weeknights, and it’s full of flavor, vitamins, and antioxidants.
Looking for breakfasts with 30 grams of protein? From a cheeseburger frittata to high protein pancakes to a delicious smoothie, you'll love...
These easy 30-minute dinner recipes are high in fiber and low in saturated fat to help support a healthy level of cholesterol.
