A Francis turbine is installed with a vertical draft tube. The top of the draft is 1 m below thecenterline of the spiral casing while the tail race water level is 3 m from the top of the draft tube. There is no velocity of whirl at the top or bottom of the draft tube and leakage are negligible. The elevation of water from the reservoir to the centerline of the turbine casing is 50 m, and water velocity at the inlet is 5 m/sec. Discharge is 2.5 m³/sec, hydraulic efficiency is 86%. Overall efficiency if 83%. Determine the reading of a pressure gage(in psi) if one is installed at the penstock just before the water inlet to the turbine.
A Francis turbine is installed with a vertical draft tube. The top of the draft is 1 m below thecenterline of the spiral casing while the tail race water level is 3 m from the top of the draft tube. There is no velocity of whirl at the top or bottom of the draft tube and leakage are negligible. The elevation of water from the reservoir to the centerline of the turbine casing is 50 m, and water velocity at the inlet is 5 m/sec. Discharge is 2.5 m³/sec, hydraulic efficiency is 86%. Overall efficiency if 83%. Determine the reading of a pressure gage(in psi) if one is installed at the penstock just before the water inlet to the turbine.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A Francis turbine is installed with a vertical draft tube. The top of the draft is 1 m below thecenterline of the spiral casing while the tail race water level is 3 m from the top of the draft tube. There is no velocity of whirl at the top or bottom of the draft tube and leakage are negligible. The elevation of water from the reservoir to the centerline of the turbine casing is 50 m, and water velocity at the inlet is 5 m/sec. Discharge is 2.5 m³/sec, hydraulic efficiency is 86%. Overall efficiency if 83%. Determine the reading of a pressure gage(in psi) if one is installed at the penstock just before the water inlet to the turbine.
ANSWER: 69. 35
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