trazado del alabe de un rotor radial

7/23/2019 Trazado Del Alabe de Un Rotor Radial

1/11

TRAZADO DEL ALABE DE UN ROTOR RADIAL, POR EL

METODO DE LOS PUNTOS

Si se considera que vara entre los valores limites 1y 2en funcin del radio(en ventiladores se recomienda una variacin lineal) se podr obtener el alabe

por sementos llevando peque!os valores de "r y tra#ando por cada uno de ellos

un elemento de alabe que forma el correspondiente nulo $ %ste es un proceso

de interacin& esta interacin es me'or efectuarla por clculo& de la siuiente

manera

Se determina cada nulo central a cada valor de r

Sea el nulo PDA= a partir del radio *'o OA=r 1

%n el "+,-+& cuyo lado +- es el arco correspondiente del nulo de y cuyo

arrelo de - es ./0& se tiene

PT=r . (d ) ...(1)

+or otro lado

PT=P T

t an ( )...(2)


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nde +,-dr

3ualando (1) y (2)

r .(d)=P T/tan()=dr / tan( )

nde d=dr /( r . tan())

3nterando entre r1 y r2 =r

1

r2

dr

rxtan( ) en radianes

=180

r1

r2

dr

rxtan() %n rados se4aesimales

+ara ventiladores se refiere variacin lineal de con r

=1+a (rr 1 )(3)

+ara nuestro dise!o se tuvo como dato

1 5/0 1 617 mm r1 18. mm

2 ./0 2 598$8 mm r2 269$98 mm

+ara r=r2y =2 : en (6)

90=40+a.(237.75159)a=0.634920634921

;inalmente la variacin lineal quedara de la siuiente manera


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=40+(0.634920634921).(r159)

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trazado del alabe de un rotor radial

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