Turbine Definition and 546 Threads

Please help me with this, In Reheat Rankine cycle, we first Expand the steam partially in a high pressure turbine and then reheat it again . How is this partial expansion in high pressure turbine done ? in the sense, what is the procedure followed to have only partial expansion of steam...

Hi all, I am not able to physically understand the term "load" when we refer to Single Shaft Gas Turbine engines used for power generation purposes. What is causing the torque on the Gas Turbine (GT) to change? Again how the speed is maintained constant while the torque is varied? For a single...

I have often wondered why conventional large wind turbines have evolved with their generators and gearboxes in the nacelle at the top of the tower where they are hard to reach and maintain. Despite this fact, I wish to believe that there may be benefits to a conventional horizontal shaft wind...

I understand that work done if we have (510,000 Kg or 5,000,000 N) of water falling 30 meters (like in a dam) would just be 5,000,000N * 30m= 150,000,000 Newton meters. But how would one measure the work captured by a turbine for a river that say travels 50km/h. I guess assuming the same mass...

I have been interested in (the concept of) large frame industrial combustion turbine supercharging since the early 90's. However, although I believe the concept has merit and has been done successfully in at least one location nearly 3 or 4 decades ago, the concept has not evolved since...

Hey guys, I am starting with the course for wind energy and although i have a pretty good knowledge until now , but I am still confused about somethings which i hope some of you will help me to clear :) Q1. Ok ... so why is there a twist in the blade? I mean wouldn't it be much...

Glad it's Friday? I will be if you can help me with this :D : I'm trying to understand an equation about calculating the power extracted by the blades of a wind turbine. I have spent a couple of hours going over it but still not making much more sense. I'm trying to find out why P =...

Dear All, I am estimating a future problem while still in erection phase for 60 MW steam turbine. I may need your help to estimate a solution. Due to some reason my process heater is not able to generate steam at the desired pressure (other parameters including Temperature and Flow rate...

I'm trying to design or find a design for a steam turbine that recycles it's water, or at least a large percentage of it, to prevent refilling of a boiler tank. My thoughts; The turbine will be powered by steam heated through copper tubing which is fed from a large unheated, (or partially...

Good day! I was thinking of building a horizontal-axis wind turbine and testing various blade designs but i can't afford a generator to test the power output of each variation. Is it sensible/possible to get the output without a generator? Can equations in finding torque be used? Thank...

I am making a small vertical savonius type wind turbine and would like some general rule guidelines. I am using 14awg magnetic wire--70 turns (2"oval) and ceramic block 1" x 2" x.375" magnets. I am hoping to get the most power possible at lower wind speeds. Is there a rule that states a...

I am going to design 10 kw, Permanent Magnet, Direct Drive Wind Turbine Generator. The main problem is, how to determine the rotational speed of the Wind Turbine. This is important for me because I have to design the PMG and its rated rpm values...

This isn't a homework problem, but i embarrassingly keep getting stuck on this simple problem.. Suppose my turbine's blades are flat surfaced. the green lines represent the wind towards the black turbine blade at the right. the blade is drawn as an edge view, such that you'd be looking...

Hi! I'v been looking into this for way too long and have come to that point where nothing makes sense, hoping you guys could help me out! :smile: Basically i have been given a net head of 20m and need to provide a micro hydro turbine with 5kW of power for over one minute. What i want to...

Can anyone tell me what is alarm loging? I m working on a gas turbine,there is a problem in its controller.my instrument fellow told me that alarm loging is not working,I m from mechanical engineering background. Thanks in advance

Hi, Just wondered why the rotor of a gas turbine (generally inside) is not made stationary and the casing (drum that surrounds the rotor) made to rotate...kind of reversed gas turbine... One limitation i thought about was the combustion can placement... Any other views as to why we don't see...

I have seen modern steam turbines with velocity compounding, they start with impulse stage then reaction stages,can anyone tell me, why There is a impulse stage first,why not a reaction stage first?

Homework Statement A wind turbine has a rotor (its rotating section) which has a moment of inertia I = 1.26 × 10^7 \text{kgm}^2. At peak output, with the rotor completing 0.25 \text{ revolutions per second}, the turbine produces a power of P = 3\text{MW}. The tips of the rotor blades sweep out...

Hi I have been looking for some simple equations that describe the turning moments on the rotor as wind direction changes. I know this can be relatively complex but I am looking for simplified equations. Has anyone got any information where I can find these? The wind turbine is a small...

Hi From what I understand as the rotor yaws, there are gyroscopic forces that act upon it and the magnitude of these depends on the speed of yawing (e.g. 10 degrees per second). What happens to the rotor rotational speed during yawing? Does it slow down? Is the aim to slow down the rotor...

Hi, I went through many resources but I am not able to understand as to what stall/surge means for an axial compressor means. I am not able to imagine or correlate it. I want to physically understand what happens in a compressor when it is stalled. For eg: Can a ceiling fan stall when the angle...

Is there such a thing (other than wind) as a slow speed turbine? If not is it an efficiency issue or what? Turbines seem to be able to put out high horsepower but at a cost of speed. By that I mean its too fast to get useable torque at low speeds. With gas being the source of power and not...

Hi - I know someone must have thought of this already, so maybe you can help me understand. When I look at some of these modern wind turbines, the blades seem massively long. I see this lumbering set of blades moving slowly and I imagine that the bulk of the wind does not even touch the...

Homework Statement Exhaust gas at 400°C and 1 bar from internal-combustion engines flows at the rate of 125 mol s-1 into a waste-heat boiler where saturated steam is generated at a pressure of 1,200 kPa. Water enters the boiler at 20°C (T_σ), and the exhaust gases are cooled to within 10°C of...

Hi, this is my first post on this forum, although I've often referred to many posts for random information, so thanks to all the people who dedicate time to other peoples questions, I greatly appreciate it. This is my first attempt for something like this and my knowledge of physics is very...

My classmates and I are working on a senior design project where we optimize a baseline turbofan for supersonic cruise. We are a little confused about when to use polytropic vs isentropic efficiencies. I have read to begin with isentropic, however is there anyone who could explain a little more...

I'm doing a survey on the topic of "gas turbine blades stress analysis" to see what areas are not focused on in this subject. I've found that not many people talk about the aerodynamic forces on the blade. Am I missing something, are they included in the calculation or are they too small to...

I can't find anything I can make heads or tails out of so if you guys can help I thank you. I would like to design a wind turbine and be able to get as much power as I can out of each of it's coils. If I start with a magnet that is 1.1811" in Diameter and it is .125" thick with a grade of N52...

Im building a turbine engine and I am having trouble figuring out the hole sizes for the burner can, my problem is that I am not using a compressor section but rather using an air compressor for the air intake so I can't use the standard formula, can I? If I know my blad diameter and the flow...

hello, i am looking for a book that has a brief intro on vertical axis wind turbine and specially on savonius turbine. I need all the necessary equations to design one. I went through google search but din't find any that contains equations. I don't even know whether this section is...

Hello, so I am building a small turbine engine and i need to know the best angle for the blades. Any help would be very helpful, thank you.

For a uni project one of my concepts is to use the exhaust heat of a formula student car to boil water and use the steam to either spin a turbocharger or an electric generator to produce electricity. How would i calculate how fast i could get the turbine to spin? What equations do i use? And...

Hello, I'm new to this board. I have a engineering question about the coolant pumps used to maintain reactors. I have been studying the basics of a PWR. I notice the pumps are fed mostly by electricity. While I see the logic and efficiency of that..I am left wondering why the space on...

We were given a project to fabricate and analyze hydroelectric power generation system. My question is what will be the shape of Pv diagram for turbine. I think it would be a point because during the process the pressure and specific volume of liquid water do not change.

First of all, I have read some of the previous posts that related to this topic, but they are closed. I am not looking to solve the world's energy crisis, but I was wondering if there was a way to harness some of the energy given off as friction from the drag of a car. I was looking at some of...

Homework Statement Run-of-the-river projects harness power from the natural flow and elevation drop of a river. In the Brandywine project, water is diverted from the river into a pipe (r=0.75 m) in which it flows down the hill, through the turbine, and returns to the river. The project at...

Hi I am having difficulty explaining to my mechanical engineering supervisors the following: When a pumped storage unit is in generation mode, synchronised to the grid and in steady state and the guide vanes/wicket gates are opened more to allow more water flow and therefore more power...

Hello physics forum, I am currently trying to figure out how to pick a generator for a horizontal axis mini wind turbine based on specs. I plan on buying a DC motor to use as a generator with blades directly attached to motor shaft. My goal is for the motor to be most efficient at 25mph wind...

I am preparing for a re-exam, this is a problem from the exam I took, but I can't see what I did wrong and why. Homework Statement Case: A turbine that is producing work dW is powered by compressed air (treated as a diatomic ideal gas). Known quantities: P_0, P_f, T_0 Wanted...

Hello, would someone know where could one purchase a radial inflow microturbine of diameter 1 - 2 cm All I need is a contact web address or similar of the manufacturer or seller. Many thanks

barring a few exceptions i read that it is because they aren't effecient at small scale. can someone elaborate on that? also, would even smaller turbines need some time to start up?

Homework Statement Modern wind turbines can convert up to 30% of the kinetic energy of the incoming wind blowing through their blades to electricity. Assuming that the wind at a proposed offshore location blows steadily at 20 knots, how much electrical power can be generated from a turbine...

Hi guys, in gas turbines, the blades of the turbine are twisted.I have searched it and as far I understand it has to do with the angle of attack,as the blade has the shape of an aerofoil.Does anyone know why are they twisted? Why they could not just have an angle without been twisted? I would...

With large wind turbines which have AC generators why do they convert from AC to DC and then back to AC before connecting to the grid, why not just connect straight from generator to the grid without converting? Very confused please can someone explain!

Thank you for reading. Turbine engines have been used earlier by Chrysler. If throttle response is a reason they aren't prevalent there are many ways to reduce it. If I am not wrong, the compressor can have variable geometry vanes(similar to VGTs) and thereby reduce lag. I learned that it...

Assuming you have an electric car that can go 100miles at 70mph on a single charge, what kind of range could you get with the following configuration? An electric car that runs off the main battery bank. Vents on the outside of the car funnel air to a Tesla turbine while the car is in motion...

Hello everyone. I'm new to the forum. I'm an engineer...admittedly perhaps not a great one. I wanted to know about a typical automotive fixed geometry turbocharger. Generally it seems that the compressor is larger than the turbine. Despite being more mass flow on the turbine side. :confused...

Please help! Steam turbine. Given parameters: turbine speed, steam flow, steam inlet and outlet pressures, nozzle and blade velocity coefficients, blade angles and blade velocity. I can find all efficiencies. How could I calculate number of stages required and the actual power produced?

Salutations... I am new to this and have a project that I am working on for power generation in high wind conditions and could use some enlightenment. I am using a proprietary, lite weight turbine (impeller) design, enclosed in a duct, that has the following dimensions: 4 blade turbine...