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OSSBERGER-Turbine

OSSBERGER Turbines are basically individually tailored to the operating

conditions to be encountered on a barrage (head/water flow)

Operating range:

!eads" ! # $%& $''

ater flows"" * # '%'+ ,- ./s

ower" 0 # ,& -''' 1

Principle

The OSSBERGER turbine is a radial and partial adission free strea

turbine 2ro its specific speed it is classified as a slow speed turbine Theguide vanes ipart a rectangular cross3section to the water 4et 5t flows

through the blade ring of the cylindrical rotor% first fro the outside inward%

then after passing through the inside of the rotor fro the inside outward

This flow pattern also has the advantage in practice that leaves% grass and

wet snow% which when the water enters are pressed between the rotor

http://www.ossberger.de/cms/pt/hydro/calculo-de-precos-turbina-hidraulica/http://www.ossberger.de/cms/pt/hydro/ossberger-turbine/envelope/http://www.ossberger.de/cms/index.php?eID=tx_cms_showpic&file=125&md5=be1906358f9bb10354b2e96c282e309e7c5f87cf&parameters%5B0%5D=YTo0OntzOjU6IndpZHRoIjtzOjQ6IjgwMG0iO3M6NjoiaGVpZ2h0IjtzOjQ6IjYw&parameters%5B1%5D=MG0iO3M6NzoiYm9keVRhZyI7czo0MToiPGJvZHkgc3R5bGU9Im1hcmdpbjowOyBi&parameters%5B2%5D=YWNrZ3JvdW5kOiNmZmY7Ij4iO3M6NDoid3JhcCI7czozNzoiPGEgaHJlZj0iamF2&parameters%5B3%5D=YXNjcmlwdDpjbG9zZSgpOyI%2BIHwgPC9hPiI7fQ%3D%3Dhttp://www.ossberger.de/cms/index.php?eID=tx_cms_showpic&file=124&md5=ce243e8fd52fd4f4ea01eb94b143d42c253cb454&parameters%5B0%5D=YTo0OntzOjU6IndpZHRoIjtzOjQ6IjgwMG0iO3M6NjoiaGVpZ2h0IjtzOjQ6IjYw&parameters%5B1%5D=MG0iO3M6NzoiYm9keVRhZyI7czo0MToiPGJvZHkgc3R5bGU9Im1hcmdpbjowOyBi&parameters%5B2%5D=YWNrZ3JvdW5kOiNmZmY7Ij4iO3M6NDoid3JhcCI7czozNzoiPGEgaHJlZj0iamF2&parameters%5B3%5D=YXNjcmlwdDpjbG9zZSgpOyI%2BIHwgPC9hPiI7fQ%3D%3Dhttp://www.ossberger.de/cms/pt/hydro/calculo-de-precos-turbina-hidraulica/http://www.ossberger.de/cms/pt/hydro/ossberger-turbine/envelope/


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vanes% are flushed out again by the eerging water 3 assisted by centrifugalforce 3 after half a revolution of the rotor Thus the self3cleaning rotor never

becoes clogged

here the water supply re6uires% the OSSBERGER is built as a ulti3cell

turbine The noral division in this case is ,"$ The sall cell utilises salland the big cell ediu water flow ith this brea1down% any water flowfro ,/7 to ,/, adission is processed with optiu efficiency This

e8plains why OSSBERGER turbines utilise greatly fluctuating water supplies

with particular efficiency

Efficienc

The ean overall efficiency of OSSBERGER turbines is calculated at 9': for

sall power outputs over the entire operating range These efficiencies arenorally e8ceeded Efficiencies of up to 97: are easured in the case of

ediu3si;ed and bigger units

2igure - clearly illustrates the superiority of the OSSBERGER turbine in thepartial load range Sall rivers and water courses often have reduced water

flow for several onths of the year hether or not power can be generatedduring that tie depends on the efficiency characteristics of the particular

turbine Turbines with high pea1 efficiency% but poor partial load behaviour

produce less annual power output in run3of3river power stations with afluctuating water supply than turbines with a flat efficiency curve

Picture 3: Efficiency characteristic of an OSSBERGER turbine developed from the 3 efficiencycurves of a 1 : 2 division compared ith the !rancis turbine"

Guide !anes

http://www.ossberger.de/cms/fileadmin/content/hydro/ossberger_turbine/1-2-03.pdfhttp://www.ossberger.de/cms/fileadmin/content/hydro/ossberger_turbine/1-2-03.pdf


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5n the subdivided OSSBERGER turbine the adission of feed water iscontrolled by two balanced profiled guide vanes which divide the water flow%

direct it and allow it to enter the rotor soothly independent of the openingwidth Both guide vanes are fitted very precisely into the turbine casing

They 1eep the aount of lea1age so low that in the case of sall heads the

guide vanes ay serve as shut3off devices


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have ultiple interposed support plates The rotors are carefully balancedprior to final assebly

Bearings

The ain bearings of OSSBERGER turbines are fitted with standardisedspherical roller bearing inserts Roller bearings have undeniable advantages

in water turbines provided that the design of the bearing housing prevents

any lea1age or condensation occurring This is the essential feature of thepatented bearing construction in OSSBERGER turbines >t the sae tie the

rotor is centred in relation to the turbine casing part fro an annual

grease change the bearing does not re6uire any aintenance

"raft Tube

5n its design principle% the OSSBERGER turbine is a free3strea turbine 5n

the ediu to low head range a draft tube is essential however 5t serves

reconcile the need for high3water safety and loss3free utilisation of the fullhead On a free3strea turbine with a wide operating range therefore the

suction water colun ust be controllable if the turbine is to be constructedas a draft tube turbine This is achieved by eans of an ad4ustable air inlet

valve which regulates the vacuu in the turbine casing 5n this way even

heads of as little as $ can be fully utilised by OSSBERGER draft tubeturbines

Operating c#aracteristics

?ue to its very design% cavitation does not occur in an OSSBERGER turbineThe turbine is always arranged above the tailwater level So essential

savings are obtained with regard to the civil costs The achine can also berun within the whole range of adission without restrictions ?ue to the

relatively low run3away speed of OSSBERGER Turbines serial generators can

be used @Aeep it siple@ was the watchword when developing theOSSBERGER turbine 5t is designed for continuous operation over a period of

decades and can be run without any special aintenance e6uipent 5t isfre6uently installed and coissioned by non3e8perts 3 especially in third

world countries

$o%-Cost "esign &or'ula

Great environental awareness eans striving to harness natural forceswithout wasting aterials or haring the environent% eg generating

electricity fro recycled energy sources The use of hydroelectric plants is


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liited however by one a4or factor" the high investent costs associatedwith the design and planning and the construction of achinery and

hydraulic engineering onsultant engineers and turbine anufacturers havetherefore attepted to reduce the overall costs by standardising water

turbines This possible course with large turbines leads% however% to

probles in the design of sall water turbines connected with the water flowand annual range of fluctuation in the water supply OSSBERGER turbines

are built fro standardised coponents which can be configured accordingto re6uireents% that is according to the water flow and head of the

particular barrage% to produce a tailor3ade plant This odular syste

facilitates low3cost anufacture whilst still designing the functions to suit theparticular pro4ect

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