INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
TURBINAS TURBINAS HIDRÁULICAS HIDRÁULICAS 1.- FORMULAS Y NOMENCLATURA: FORMULARIO (TURBINAS PELTÓN) •
Q=V.A Donde; Q= caudal V= velocidad A= área
A=
Donde; A= área d=diámetro del rodete
A=
Donde; A= área dch= diámetro del chorro.
Q=V.
Donde; Q= caudal dch= diámetro del chorro. V= velocidad
U=
Donde; U= velocidad periférica o velocidad absoluta del álabe
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO d= diámetro del rodete N= rpm
Donde; Pa= potencia til! potencia restituida! potencia al freno! potencia del e"e Q= caudal #= altura neta = peso espec$fico del a%ua nt= rendimiento total & rendimiento %lobal. P=Q.
#
Donde; P=Potencia P=Potencia te&rica 'potencia absorbida absorbida o potencia neta=potencia neta=potencia hidráulica puesta de la turbina( Q= caudal = peso espec$fico del a%ua #= altura neta
U=).*+ Donde; U= velocidad periférica o velocidad absoluta del álabe %= fuer,a de %ravedad #= altura neta
=).- Donde; =velocidad absoluta del fluido 'a la entrada( %=fuer,a de %ravedad
a disposici&n disposici&n
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO = nmero espec$fico de revoluciones = rpm =rendimiento total = caudal #= altura neta
Donde; =potencia interna /=fuer,a tan%encial = velocidad periférica o velocidad absoluta del álabe 'a la entrada( •
0h=
FORMULARIO FORMULARIO (TURBINAS FRANCIS Y KAPLAN)
=
Donde; 0h= 1endimiento hidráulico #u= Altura te&rica #= Altura neta = Velocidad periférica & velocidad absoluta del álabe 'a la entrada( = 2omponente periférica de la velocidad absoluta del fluido 'a la entrada( = Velocidad periférica & velocidad absoluta del álabe 'a la entrada( = 2omponente periférica de la velocidad absoluta del fluido 'a la entrada( %= /uer,a de %ravedad Q= 3 4 Q=caudal
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO = área til a la entrada del rodete 'e"emplo5 los álabes ocupan un 67 del área til a la entrada del rodete! de ser as$! 3 es i%ual a 8))7967! es decir! 3= -:7( Q= 3 4 Q=caudal = diámetro a la salida del rodete = ancho del rodete = 2omponente meridional de la velocidad absoluta del fluido = = área til a la salida del rodete! de suponerse afilados los álabes 3=8.
m= Donde; = 2omponente meridional de la velocidad absoluta del fluido 'a la entrada( = diámetro a la salida del rodete = ancho del rodete = ancho del rodete = diámetro a la entrada del rodete = 2omponente meridional de la velocidad absoluta del fluido 'a la salida(
/=Q '
(
Donde; /= fuer,a tan%encial e"ercida por el chorro sobre las cucharas. Q= caudal = densidad del a%ua.
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
Donde; U= velocidad periférica o velocidad absoluta del álabe d= diámetro del rodete N= rpm
Donde; Pa= potencia til! potencia restituida! potencia al freno! potencia del e"e Q= caudal = peso espec$fico del a%ua nt= rendimiento total & rendimiento %lobal. < Donde; =potencia interna = potencia til! potencia restituida! potencia al freno! potencia del e"e = potencia de ro,amiento mecánico
Donde; =potencia interna /=fuer,a tan%encial = velocidad periférica o velocidad absoluta del álabe 'a la entrada(
=Q Donde; Q= caudal =potencia interna
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
Donde; #=altura neta =altura te&rica = Perdidas interiores
0h=
Donde; 0h= rendimiento hidrául"co #=altura neta =altura te&rica
0m!=
Donde; 0m= rendimiento mecánico =potencia interna = potencia til! potencia restituida! potencia al freno! potencia del e"e
0t!=
Donde; 0t= rendimiento total o %lobal = potencia til! potencia restituida! potencia al freno! potencia del e"e P= potencia neta
0i!=
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
= Donde; = radio de entrada del rodete = radio de salida del rodete >cuaci&n de ?ernoulli
Donde; Pe= Presi&n de entrada Ve= Velocidad de entrada @e= cota de entrada #= Altura neta Ps= Presi&n de salida @s= 2ota de salida Vs= Velocidad de salida = Densidad del a%ua %=fuer,a de %ravedad
Donde; = nmero espec$fico de revoluciones
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
•
D*"$&' ," &',"$". R%* P'$"!+ ,"#+&&'+,+ %'& + $/&!+ (P+).
•
E!"&@+ ," 4'&&' !' +%&'="4+,+ (
• •
.
>l primer dato ue arro"a el problema es la velocidad del chorro =)mBs 'velocidad del chorro( A continuaci&n continuaci&n debemos debemos llevar 8+)) 8+)) ltsBmin a 8
=8) =8))) lts lts! 8mi 8min=C) =C)se%
Q=8+)) Q=)!):+ Aplicando Aplicando la si%uiente si%uiente ecuaci&n ecuaci&n del caudal caudal Q=V.
Donde; Q= caudal dch= diámetro del chorro. V= velocidad Despe"ando el diámetro del chorro obtenemos;
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO dch=)!):8FF m >l enunciado nos dice ue diámetro del rodete es F) veces maEor al diámetro del chorro entonces; d= F).dch d= F). ')!):8FF(
,;6.* De esta manera resolvemos la primera inc&%nita del problema. Procedemos a calcular las rpm'revoluciones por minuto( de la turbina mediante la si%uiente ecuaci&n! u=
Donde; u= velocidad periférica o velocidad absoluta del álabe d= diámetro del rodete N= rpm Despe"ando N'rpm( se obtiene ue! N=
'>cuaci&n 8(
Para poder continuar debemos calcular u'velocidad periférica(! el enunciado nos dice ue; u=).+
'>cuaci&n :(
e tiene ue! por teor$a ue la velocidad absoluta del fluido a la entrada es aproGimadamente = Donde; =velocidad absoluta del fluido 'a la entrada(
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO u=).+ u=F+mBs >l valor de u=F+mBs E el d=).C*m deben ser sustituidos en la ecuaci&n 8! N=
N;169&%* Ahora procedemos procedemos a calcular la potencia desarrollada desarrollada por la turbina turbina mediante mediante la ecuaci&n; ecuaci&n; Donde; Pa= Potencia til! potencia restituida! potencia al freno! potencia del e"e Q= 2audal = Peso espec$fico del a%ua nt= 1endimiento total & rendimiento %lobal 1ecordemos ue tenemos los si%uientes datos5 Q=).):+ =-68) #=:*-.6Fm >l problema no arro"a nin%n dato referente al rendimiento de la turbina! por lo ue se asume un rendimiento total del 8))7! es decir! nt=8 Pa=').):+(.'-68)(.':*-.6F(.'8(
P+;1128 P+;1128 ; 1128 666 Para calcular calcular la ener%$a del chorro no aprovechada ' b
l t d l flfl id '
debemos conse%uir la velocidad
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
i no se toma en cuenta la fricci&n en los álabes; Del trián%ulo de entrada deducimos
=')9 F+(mBs = F+mBs Por relaci&n de trián%ulos
= en
.
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO /inalmente;
=C!8))-mBs ustituimos en la ecuaci&n de la ener%$a del chorro no aprovechada;
2.2 U!+ $/&!+ P"$'! @&+ + >58 RPM 3 #/ +$/&+ !"$+ "# ," 6*9 ,"#+&&'+ /!+ %'$"!+ "! " "" ," 1669 /;6.8
9 1;6. 6.5 5
. E E &"! &"!, ,*" *"! !$' $'$+ $+ ," ," + + $/ $/&! &!++ "# "# 6 6.. L+ L+
="',+, + + "!$&+,+ ," + $/&!+ "# 198 *7#. C+/+&: D*"$&' ," &',"$". C+/,+. ("! $&'#7#"@) • •
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
d=
Donde; u= velocidad periférica o velocidad absoluta del álabe d= diámetro del rodete N= rpm
Lenemos los si%uientes datos5 N=F+1PI u=8+!**mBs d=
,;695* Ahora calculamos calculamos el caudal despe"and despe"ando o de la ecuaci&n; ecuaci&n;
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
Mlevamos de
Bse% a ltsBse% como lo pide el enunciado;
Q=)!:8:
J ; 2129 $#7# Aplicando Aplicando la si%uiente si%uiente ecuaci&n ecuaci&n del caudal caudal Q=V.
Donde; Q= caudal dch= diámetro del chorro. V= velocidad Despe"amos el diámetro del chorro obtenemos; dch=
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO Para este planteamiento planteamiento la presi&n de salida es la presi&n atmosférica atmosférica Ea ue las turbinas pelton no tienen carcasa! por ser la presi&n atmosférica nuestro punto de referencia la presi&n de salida será cero!
Ma velocidad de salida también será cero Ea ue el análisis se hace en el punto de choue entre el chorro de a%ua E loas cucharas de la turbina 'en este punto haE un cambio de direcci&n del chorro(
>l chorro sale del inEector a una cota i%ual a la ue impacta contra las cucharas de la turbina! entonces @e9@s=).
#= Nos ueda la si%uiente ecuaci&n! despe"ando Pe tenemos ue!
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO '!"! ," *+!*"$&' ," "!$&+,+9 + %&"#! &"+$=+ "# ," >+&. S" ,"#%&"+&! +# %&,,+#. C+/+&. C+/+& + %'$"!+ ,"#+&&'+,+ %'& " *'$'&. A continuaci&n continuaci&n debemos debemos llevar 8+)) 8+)) ltsBmin a 8
=8) =8))) lts lts! 8mi 8min=C) =C)se%
Q=8+)) Q=)!):+ P8=Cbar P:=Cbar Planteamos la ecuaci&n de ?ernoulli desde el punto ubicado a +m por deba"o del punto de coneGi&n del man&metro 'este punto representa ahora nuestro punto de entrada(. Nuestros datos serán5
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO P=Q.
#
Donde; P=Potencia te&rica 'potencia absorbida o potencia neta=potencia hidráulica puesta de la turbina( Q= caudal = peso espec$fico del a%ua #= altura neta
a disposici&n
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO P= Potencia neta Pa= Potencia til potencia restituida! potencia al freno! potencia en el e"e. nt= rendimiento total o %lobal. ustituimos Pa= !F+JK E nt=+7 P= P= -.68)JK
2.8 U!+ U!+ $/& $/&!+ !+ F&+! F&+!# # $"! $"!"" +# +# #@/" #@/"!$" !$"## +&+ +&+$" $"&# &#$ $+#9 +#9
;26* ;2 6*99
;>66 ;>6 6 *9 *9 2;6<9
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO Lenemos O: =8CmBs Por Pitá%oras encontramos c :m;
c:m= c:m= c:m=c: =O:m=-!-)*mBs 2omo Q8=Q: entonces!
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO c8= c8= c8=6.*C:mBs Procedemos a calcular el caudal! Q=4.d8b8c8m Q=caudal = diámetro a la entrada del rodete = ancho del rodete
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO Donde; #u= Altura te&rica = Velocidad periférica & velocidad absoluta del álabe 'a la entrada( = 2omponente periférica de la velocidad absoluta del fluido 'a la entrada( = Velocidad periférica & velocidad absoluta del álabe 'a la entrada( = 2omponente periférica de la velocidad absoluta del fluido 'a la entrada( %= /uer,a de %ravedad
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
Donde;
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
N=
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO ," + $/"&+ ," "!$&+,+ 1*9 ,*"$&' ," $/' ," +#%&+! "! + #"! ,'!," "#$ '!"$+,' " *+!*"$&' M#;186*.
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
Donde;
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INSTITUTO POLITECNICO NACIONAL ESCUELA SUPERIRO DE INGENIERIA MECANICA MECANICA Y ELECTRICA UNIDAD AZCAPOTZALCO
olo nos ueda sustituir las presiones E despe"ar #! n&tese ue las presiones están en unidades
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