ultra low head turbine

8/10/2019 Ultra Low Head Turbine

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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

ultra low head turbine

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