Question

Steam enters a rotor of an axial turbine with an absolute velocity V1 320 m/s at an angle = 73°. The axial velocity remains constant. The blade speed is U 165 m/s. The rotor blades are equiangular so that. Draw the velocity triangles. Find 1) the runner velocity (take runner diameter to be 1.12 m) 2) Inlet axial absolute velocity 3) Inlet tangential absolute velocity ative velocity 5) the relative flow angle 2814 rpm b. 2019 rpm c. 1970 rpm d. 3200 rpm 93.55 m/s f. 306 m/s a. 86.1 m/s 288.12 m/s 97 m/s 320 m/s 141 m/s 210 m/s . 321 m/s n. 56.43 deg X 44.12 deg p. 50.12 deg

Answer 1

Please refer following image for solution

Given an-llet vedociny jet oet angle e, = 73 Steam veiocity lo is constnt- Seed blade The U165 ls Blacles are equittngua = f, - f, Sclution Inlet Oute Var --Vw2 is velocity (Hacde Speed) then RPM can be tound S gi vendiomee 1The u pine? given TI ON 6 0 6 0 . N TT X 12 N 2813 63 2814 Epm ar a N 2814 2prn To ind In le t velocity d /ow, whiel & aie e wil considei, Inied velocity iogie veioeity arg ke a igh angled iangle hese, vi, & V,, toms Enown V sin Inet tangential elocity Iner arial veiocity also Vw V, Cosa Vw 320 Cos7 3 Vw 93.S m/c ans ) -.

eanyential velocity (V\ Can be give n a cipbirel cbove V,v sin 20 Sin 7.3 V 306. 0 R 306 -ans t Vi, =306 my 4 Inkt be cund by conidszing 2clative velocity tostned y V, (,-U Can A siangle VE 306 mis V,-U 93.S5-165 s that blode velocity U is moie an negutive sign Vlocity ^ whil, so the velociry iangle can be iediawn V 306 m/S V-Vw, 71- M5 mis here V (v-V Vw V2,- -C306)-2 Relative low ange , Vi tan,-U-Vw . tari'/30 71.5 76-85