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=
unknown GIVEN: Blade Tip Radius:
95mm
; Blade Hub Radius:
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.