Determine the rotational speed of the impeller

Assignment Help Mechanical Engineering

Reference no: EM131057260

a. Write down the advantages and disadvantages of using free-vortex guide vanes upstream of the impeller of a high-pressure ratio centrifugal compressor. What other sorts of guide vanes can be used and how do they compare with free-vortex vanes?

b. The inlet of a centrifugal air compressor has a shroud diameter of 0.2 m and a hub diameter of 0.105 m. Free-vortex guide vanes are fitted in the duct upstream of the impeller so that the flow on the shroud at the impeller inlet has a relative Mach number, M1,rel = 1.0, an absolute flow angle of α1 = 20°, and a relative flow angle β1= 55°. At inlet the stagnation conditions are 288 K and 105 Pa. Assuming frictionless flow into the inlet, determine

i. the rotational speed of the impeller;

ii. the air mass flow.

c. At exit from the radially vaned impeller, the vanes have a radius of 0.16 m and a design point slip factor of 0.9. Assuming an impeller efficiency of 0.9, determine

i. the shaft power input;

ii. the impeller pressure ratio

Reference no: EM131057260

Questions Cloud

Assume the stanitz expression for the slip factor : the absolute Mach number of the flow at the impeller tip given that the radial velocity at that location is 30 m/s;

Approximate the size of a molecule : Approximation of Avogadro's Number Using Glass Beads and Monomolecular Film & Approximate the size of a molecule and the number of oleic acid molecules in a mole of oleic acid.

What is the molar concentration : Carbonated cola is more acidic than coffee or even orange juice because cola contains phosphoric acid. What is the molar concentration of H3O+ in a cola that has a pH of 4.240?

Examine the ethical environment in which mcdonalds operates : Critically examine the ethical environment in which McDonalds operates and consider the impact this has upon its business behaviour and performance.

Determine the rotational speed of the impeller : At exit from the radially vaned impeller, the vanes have a radius of 0.16 m and a design point slip factor of 0.9. Assuming an impeller efficiency of 0.9,

What is the freezing point of a solution : What is the freezing point of a solution that contains 28.9 g of urea, CO(NH2)2, in 295 mL water, H2O? Assume a density of water of 1.00 g/mL.

Question regarding the precipitation reaction : Let us assume that Cr(OH)3(s) is completely insoluble, which signifies that the precipitation reaction with NaOH(aq) (presented in the transition) would go to completion.

Article from money about felony disenfranchisement : Reread the article from money about felony disenfranchisement. Write one detailed paragraph in response. Explain the situation- what's happening? Then give your opinion about it. How should felons be treated in the voting system? Why?

What about the worst-case scenario : Sloan Transmissions, Inc., has the following estimates for its new gear assembly project: price = $1,600 per unit; variable costs = $320 per unit; fixed costs = $2.7 million; quantity = 78,000 units. Suppose the company believes all of its estimates ..

User Account

All Pages