ultra low head turbine
TRANSCRIPT
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FINAL PRESENTATIONON
Study of Ultra Low Head Turbine for N
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NISCHAL POKHAREL (32102)
PRADEEP PARAJULI(32098)PRATIK KOIRALA(32117)
REJIT DULAL(32081)
TEAMWOR
K
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Background
Objectives
Ultra low head(ULH) turbine : Introduction
Scope of work
Methodology
Operational principle
Work accomplished Problem faced
Conclusion
Project overview
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BACKGROUND
Hydropower Status of Nepal
Problem and Solutions Small projec
affordable c
Project concern
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OBJECTIVES
Investigate the existing hydropower and identify core issues forvery low head hydropower
Findings regarding the aesthetics of the ultra-low head turbiits reliability, functionality and selection of sites and future
proceedings for the design.
Design and the installations arrangementhe ultra-low head turbine
Design of the test
turbine and data a
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Ultra low head(ULH) turbine : Introduct
Ultra low-hea
Head : lessthan 5 m
Applicableeven natur
man-marivers an
canals wlittle or n
water stor
capacit
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SCOPE AND LIMITATIONS
Study of possibility of Ultralow
head turbine and the possible area of installation(Terai and man made canals)
Simple prototype design and design
consideration of the canal required(no velocity
triangle analysis)
Electrical components (ge
Study of metallurgical pro
and hub material for turb
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METHODOLOGY
Literature review
Consultation
Web search
Email
Books
Site visit
Panauti canal
(discharge
measurement andposibility ofapplicationn)
Model preparation
First model
Second model
Third model
Model testing
Test at irrigation canearby roshi khola
(panauti)
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CONTD..
= (
) F
= (
)
Where, =(
)
which is drop in water level due to velocity.
=
Q= flow rate
v2=(d1/d2)v1
v2= downstream velocity
V1= upstream velocity
Counteracting force due
acceleration
Force due to pressure
difference
Thus power output,,
= ( ) ( )
And the efficiency, =
=
()
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WORKS ACCOMPLISHED
Visit to Rossi kholaCanal
Model preparation and testing
(along design)
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First Model
Second Model
Third Model
CONTD..
Fig :Successful modification of our model
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Discharge and head measurement at RossiKholacanal Discharge obtained by Floatation method= 1.093 /
Depth of canal= 1.305
Both head (below 5 )and discharge ( 10 /) arewithin the required range for ULH turbine
Concluded site to be favorable for it.
Development of the model design
First Model
o Tested in Rossi kholacanal
o Rotates in anticlockwise directionwith 20
o But deviation in static pressuredifference principle due to lack ofhub
Second Model
o Deviation corrected byit and blades attached t
o Expected to test it in frMechanics Lab and asstesting was done
o But not tested
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Testing of model :
Consultation with Associate.Prof. Dr.
Dimitar Kisliakov ,Dept. of Hydraulicengg,Bulgariaabout design parameter.
Inability to test due to the problem of:
1. Presence of side plate that block
water passage.
2. Inaccurate ratio of blade and the hub
3. Also, leakage problem
Fig Isometric view of second model
Fig Assembly arrangement for second mod
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Fig: Isometric view of third model Fig: Different views of
Design of third Model:
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CONTD.. Third Model:
oSmall model was prepared with some design considerations
oBoth hub and blades made up of PVC pipe
oSlots was made on hub to attach blades to increase strength
oSealing done by M-seal
oGeometric specifications:
Consists of 8 curved blades with a preferred angle of 20
degrees. The blade depth, T = 10.6 cm
The hub diameter, D =15.24 cm
The projected blade length (L) parallel to the axis of hub=23 cm [to maintain the relation (L
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CONTD..
Also following assumptions are to be made while testing it
Hub diameter = 1.2 to 1.25 times headdifference (to reduce the turbulence lossesduring blade entry upstream)
d2= blade depth T but not less than 0.7 T (tomake significant efficiency)
The projected blade length parallel to hub axis
not less than 0.7 times the canal width to allowwater from sides.
Fig: Top view of
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jn
Canal
reservior
pump
Site Selected for testing
Direction of flow of water
In front of FluLab
Closed loop w
Pump (18 L/s
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Failure of testing in the planned
site at nearby fluid lab due toinsufficient discharge .
Plannin
own ca
of testinearby
THEN
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CANAL SEPCIFICATION
Use of wooden plank.
Width of base of the canal= 35 cm
Height of the side planks of the canal= 42 cm
Length of each wooden planks= 220 cm
Bearing (SKF 6205) was used to adjust the shaft(diamater 2.the canal wall
Turbine fitted at distance of 150cm from intake.
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TEST SETUPTURBINE HUB
SHAFT
TURBINE BLADESIDEWAYS LOSS BLOCKAGE
INTAKE WATER
LEVELOUTLET WATER
LEVEL
BEARING
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MODEL TESTING AND RESULT
Tested on the site nearby roshi khola .
Discharge varied by varying the area of
intake of canal.
Upstream velocity noted
Upstream height noted
Rpm noted
Efficiency and ideal pow
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Data analysis
v2 d1 H Q Fp Fa Po Pi efficiency
0.65 0.14 0.07 0.016 12.8 5.2 5.0 11.00 45.14
0.70 0.15 0.08 0.017 14.4 6.4 5.6 13.47 41.81
0.75 0.16 0.09 0.018 16.0 7.7 6.2 16.15 38.48
0.79 0.17 0.10 0.019 17.5 9.1 6.7 19.07 35.15
0.84 0.18 0.11 0.021 19.0 10.6 7.1 22.20 31.82
0.89 0.19 0.12 0.022 20.4 12.2 7.3 25.56 28.49
0.93 0.2 0.13 0.023 21.7 13.9 7.3 29.15 25.16
0.98 0.21 0.14 0.024 23.0 15.7 7.2 32.96 21.83
1.03 0.22 0.15 0.025 24.3 17.6 6.8 36.99 18.50
1 2 3 4
Q 0.016 0.017 0.018 0.019 0
Po 5.0 5.6 6.2 6.7
0.000
1.000
2.000
3.000
4.000
5.000
6.000
7.000
8.000
outputpower
Graph showing thdischarge and ou
T =gHQ
= 39.71 Nm
The torque calculated for the head difference of 12 cm is
N= 12 rpm, H= 12 cm
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Problems Faced
Very few source ofinformation
Insufficient discharge at theplanned cannel to test Solutio
Design of own
selecting the te
Testing at the icanal near Ros
GANTT CHART
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GANTT CHARTS.N Activity March April May June
1. Concept
development
2. Literature review
3. Model preparationfor testing
4. Site Selection for
testing
5. Progress report
and midterm
presentation
6. Material
collection and test
rig preparation
7. Testing of the
model and data
analysis
8. Final
Presentation
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CONCLUSION AND RECOMENDAT
Learned about design criteria of the ULH turbine
Universal test rig needed to be prepared
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THANK
YOU