Question

QUESTION 1: A hydro-electric plant is planned for a site where the available head is 286 m with an average flow of 42 m3/s.

1.1 What is the available hydraulic power? ANS: 117.84 MW

1.2 Assuming an overall efficiency of 88% and a runner rotational speed of 450 rpm, what is the dimensionless specific speed? ANS: NSt = 0.705 rads

1.3 What kind of turbine is suggested for this application? In order to predict the operational performance of the turbine, it is decided to do tests on a 1:20 scale model turbine operating under a head of 4 m. 1.3 At what speed is the model expected to run at? ANS: 1064.36 rpm

1.4 What flow rate would have to be provided for the model? ANS: 0.012 m3/s

1.5 What power is the model expected to deliver? ANS: 487.27 W

Answer #1

A Francis turbine has the following information:
Pressure head supply into turbine HNet = 300 m of water, • Q =
10 m3/s, • N = 400 rev/min, • Runner diameter Drunner = 3m, •
Runner inlet width Br = 0.5 m, • Velocity (absolute) at the inlet
Vai = 15 m/s, • Draft tube gives 2 m height before water exits, •
Overall efficiency ɳo = 80 % Assuming radial outlet and ignore
losses across the guide vanes and...

A Francis turbine operates with the following data:
Head: 100m; Flow rate 36 m3/s; Speed: 410rev/min; Outer radius of
runner 0.6m; Absolute flow angle: 72◦; Velocity: 36m/s;Exit swirl
angle: 0◦ Calculate the effective runner width (i.e. ignoring
blockage) and relative flow angle at inlet, the power output and
efficiency. Answers: 0.859 m,37.3◦,31.8 MW,90.0%

TURBINE IMPULSE - PELTON WHEEL
QUESTION 1:
The nozzles of a
4-jet Pelton wheel turbine, each have a diameter of 125 mm and the
velocity of each water jet is 96 m/s. The available head at the
nozzles is 500 m. The blade velocity is 46% of the jet velocity.
The turbine has a hydraulic efficiency of 85% (i.e. nozzles
included). The friction across the buckets is 6% from entry to
exit.
Sketch the vector diagram showing all
details. Calculate:...

Ten turbines are installed in a hydroelectric power station,
each with a diameter of 4.5 m impeller and each generating a
mechanical power of 54 MW at 107 rpm and with an efficiency of
93.8%, for a net head of 65 m. A) Determine the specific speed of
each turbine in dimensionless form and in units of the American
system. B) What type of turbine should have been selected? Justify
your answer. B) Calculate the flow that passes through each...

Part II
HAWT DESIGN QUESTIONS
Hint: questions 1-3 are answered in terms of the definition of
Cp.
1. Doubling power output requires what % increase in diameter?
_______ Why? ___________________
2. Doubling wind speed provides what % increase in power?
_______ Why? __________________________
3. Reducing air density by 10% changes power by what percentage?
Increase or decrease in power?
________________________________________________________________________________
4. Doubling wind speed requires what change in rpm (to provide
same efficiency)? (Hint: Dynamic similarity requires same tip speed...

Please answer the following Case
analysis questions
1-How is New Balance performing compared to its primary rivals?
How will the acquisition of Reebok by Adidas impact the structure
of the athletic shoe industry? Is this likely to be favorable or
unfavorable for New Balance?
2- What issues does New Balance management need to address?
3-What recommendations would you make to New Balance Management?
What does New Balance need to do to continue to be successful?
Should management continue to invest...

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