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Steam issues from the nozzle with a velocity of 1000 m/s in a De Laval turbine. The nozzle angle is 20°, mean blade velocity is 350 m/s. The inlet and outlet angles of the blades are equal. The mass of the steam flowing through the turbine per second is 0.3 kg. Calculate the tangential force on the blades. Take blade velocity coefficient as 0.8.

Correct Answer: 318 N
Cbl = 350 m/s, C1 = 1000 m/s, α = 20°, K = 0.8, ṁ = 0.3 kg/sec, θ = Ф Steps of Construction – Select a suitable scale and draw a line LM to represent Cbl (= 350 m/s). At point M make angle of 20° (α) and cut length MS to represent the velocity 1000 m/s. Produce L to meet the perpendicular drawn from S at P. Thus inlet triangle is completed. By measurement: θ = 30.4°, Cr1 = 681.7 m/s θ = Ф = 30.4° Cr2 = KCr1 = 0.8(681.7) = 545.36 m/s At point L, make an angle of 30.4° (Ф) and cut the length LN to represent Cr2(= 545.36 m/s). Join MN. Produce M to meet the perpendicular drawn from N at Q. Thus outlet triangle is completed. By measurement: Cw1 = 939.69 m/s and Cw2 = 120.38 m/s Tangential force on the blades = ṁ (Cw1 + Cw2) = 0.3(939.69 + 120.38) = 318.021 N ≈ 318 N

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In a De laval turbine, steam leaves nozzle with a velocity of 1300 m/s. The nozzle angle is 25° and the mean blade speed is 500 m/s. The inlet and outlet blade angles are equal. Find out work done per kg of steam if the blades of the turbine are frictionless.

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In a reaction turbine, the fixed blades and the moving blades are of the same shape but reversed in direction. The mean blade speed is 30 m/s. The absolute velocity of the steam leaving the nozzle is 90 m/s and the absolute velocity of steam leaving the moving blade is 64 m/s. Determine the nozzle angle.

If for a certain simple impulse turbine, the blade inlet and outlet angles are 35° and 30° respectively and the relative velocity of steam to moving blade at entrance and exit are 350 m/s and 320 m/s respectively, determine the axial thrust on the bearings. The turbine has a steam flow rate of 20 kg/s.