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I am supposed to solve this by using Airy stress function. We have the general formulas for the stresses sigma_r, sigma_theta, and tau_rtheta. However, I do not quite understand what the boundary conditions are. I understand that sigma_theta when theta = beta, which is the normal stress of the...

@SparWeb I thought so too unfortunately :\ well all I can do is wait then @rb1957 it is the Cl value for every incoming wind speed. I am not sure, but I think it has nothing to do with the blade.. rather the airfoil (?) Here is two other plots just to compare with the curve above. One is Cl vs...

QBlade has submodules named "Rotor BEM Simulation" and "HAWT BEM Simulation". In both of these submodules, they can provide a "lift coefficient vs angle of attack" plot for every wind speed/TSR. These Cl vs alpha plots are different than the one produced by XFOIL. In fact, I have never seen a...

@rb1957 I am puzzled as well. But let me show you my calculations. Below is the twist and pitch data for my wind turbine rotor. Twist is obtained automatically from QBlade twist optimization tool I calculate my angle of attack based on this diagram. theta (relative wind angle) = beta +...

Hello. I designed a 3 bladed HAWT rotor with airfoil S1210 12% from UIUC database. Now, I must validate the results using a blade element momentum method (Chapter 6, sub chapter 6.1 and 6.8 in the book "Gasch, R., & Twele, J. (2012). Wind Power Plants Fundamentals, Design, Construction and...

Thanks again for the replies, everyone. @rb1957 The design points are chosen, and it is indeed at a specific rate (190 rpm because it is a small wind turbine). Designing the blade with the unloading function as you mentioned might be too complex for my application and capability, but I will...

@RRiver Thanks for the reply. Indeed, and it is an interesting topic as well! @rb1957 Thanks for the reply. I see. I looked up the stuff earlier and the closest things to an equation are diagrams showing the angle components in a turbine blade. It is as you explained. Thanks! @3DDave Thanks...

Greetings. I am trying to calculate the performance characteristics (thrust, torque, power) of a wind turbine rotor using the blade element momentum method (Chapter 6, sub chapter 6.1 and 6.8 in the book "Gasch, R., & Twele, J. (2012). Wind Power Plants Fundamentals, Design, Construction and...

To Danlap Thanks! So I'll check the flow characteristics especially around vena contracta. It shouldn't reach critical pressure though, the pressure is only around 270 psia max. while all the gas components have Pcr above 400 psia. I have addressed Cv, maximum working P at given T (according...

Ah, what I mean by repurpose is using the DBQ valve (which is supposed to handle water and steam) to handle fuel gas. I have conducted control valve sizing for my process of interest. The results show that the DBQ valve can handle the process. However I have to make sure that the valve will not...

To LittleInch Thanks! I've submitted a query to the vendor. However I'm still curious about the practical issues you mentioned. Can you give me some examples? From what I know, leakage is an important factor. But since the control valve is also applicable for steam, logically it should do fine...

Can we repurpose a water & steam valve for fuel gas application? This fuel gas consists of common gases such as CO2, N2, and hydrocarbons with molecular weight of 40. The valve is a DBQ Fisher class 900 valve https://www.spartancontrols.com/~/media/resources/fisher/d/dbq%20info.pdf What are...

Thank you for the responses! Because of the complexity I decided to use HYSYS with a process coworker. It works!

In a gas compressor plant, a gas mixture containing 16 different gases with known composition enters a gas scrubber. The inlet and outlet pressure and temperature is known. Question: 1. How can we calculate the flow rate (mass or volumetric, but preferably volumetric) of the condensate or the...

From the many sources that I read (skimmed), for some reason flashing always has a liquid feed example/diagram... never a gas feed. Can I do isothermal flashing calculations with a gas feed then?

To MortenA, LittleInch, chemlite Thanks a lot! I'll look into isothermal flashing and Prode. If it's too complicated I'll use HYSYS. [thumbsup2]

In a gas compressor plant, a gas mixture (containing 16 different gases) goes out of a compressor discharge into a cooler/condenser. Pressure and temperature at condenser inlet and outlet is known. In the cooler outlet, there will be both condensed gas and the remaining uncondensed gas. How can...