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# (Solved): Volumetric Flow Rate, Q=25(m^(3))/(m)in; Working Fluid: Water at STP Impeller #I: \omega _(I)=3,000 ...

Volumetric Flow Rate,

Q=25(m^(3))/(m)in

; Working Fluid: Water at STP Impeller #I:

\omega _(I)=3,000rpm;,

Impeller #II:

\omega _(II)=-3,000rpm

Degree of Reaction: Impeller # I -

R=0.50

; Impeller # II:

R=

95mm

37.5mm

Assume flow is axial at BOTH Section 1 and at Section 4. Assume blade angles equal corresponding flow angles. Perform your calculations at the mean radius as defined in Peng (Pg. 45). FIND: Blade peripheral speed at mean radius for Impeller I,

U_(I)

. SECTION # 1 At Section #1, determine: Absolute Velocity,

V_(1)

, and Relative Velocity,

W_(1)

. Draw the Vector diagram of velocity vectors at Section #1, to scale. Determine the blade angle,

\beta _(b1)

on Impeller I. SECTION # 2 At Section #2, determine: Absolute Velocity,

V_(2)

, and Relative Velocity,

W_(2)

. Draw the Vector diagram of velocity vectors at Section #2, to scale. Determine the blade angle,

\beta _(b2)

on impeller #I. Determine the Power,

P_(s1)

, required for impeller #I. Determine the total Pressure rise from Sections 1 to 2. Sketch to scale (using drawing instruments) the blade on impeller # I. SECTION # 3 At Section #3, determine: Absolute Velocity,

V_(3)

, and Relative Velocity,

W_(3)

. Draw the Vector diagram of velocity vectors at Section #3, to scale. Determine the blade angle,

\beta _(b3)

on impeller # II. SECTION # 4 17.At Section #4, determine: Absolute Velocity,

V_(4)

, and Relative Velocity,

W_(4)

. Draw the Vector diagram of velocity vectors at Section #4, to scale. Determine the blade angle,

\beta _(b4)

on impeller # II. Sketch to scale (using protractor, etc.) the blade on Impeller # II. Determine the Power,

P_(sII)

, required for impeller # II. Determine the total Pressure rise from Sections 3 to 4. Determine the Degree of Reaction,

R_(I)

, of impeller # II. OVERALL: Determine the total Power,

P_(s,TOTAL)

in horsepower needed to operate the pump. Determine the total Pressure Rise,

\Delta p|_(1-4)

provided by the pump. Find the overall Degree of Reaction,

R_(I+II)

, accross both impellers. Sketch both blades side by side.

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