(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)=-3,000rpmDegree of Reaction: Impeller # I -
R=0.50; Impeller # II:
R=unknown GIVEN: Blade Tip Radius:
95mm; Blade Hub Radius:
37.5mmAssume 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.
