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The design of a single-stage axial-flow turbine is to be based on constant axial velocity with axial discharge from the rotor blades directly to the atmosphere. The following design values have been specified: Mass flow rate 16.0 kg/s Initial stagnation temperature, To1 1100 K Initial stagnation pressure, Po₁ 230 kN/m² Density of blading material, p 7850 kg/m³ Maximum allowable centrifugal stress at blade root 1.7 x 10³N/m² Nozzle profile loss coefficient, Yp = (Po1- Poz)/(Po2 - P₂) = 0.06 Taper factor for blade stressing, K = 0.75 In addition the following may be assumed: Atmospheric pressure, p3 102 kPa Ratio of specific heats, y 1.333 Specific heat at constant pressure, Cp 1150 J/(Kg K) In the design calculations values of the parameters at the mean radius are as follows: Stage loading coefficient, = AW/U² =1.2 Flow coefficient,= C/U= 0.35 Isentropic velocity ratio, U/C -0.61 where Co = (2 (h01 - h3ss)) 0.5 Determine (i) the velocity triangles at the mean radius; (ii) the required annulus area (based on the density at the mean radius);

The design of a single-stage axial-flow turbine is to be based on constant axial velocity with axial discharge from the rotor blades directly to the atmosphere. The following design values have been specified: Mass flow rate 16.0 kg/s Initial stagnation temperature, To1 1100 K Initial stagnation pressure, Po₁ 230 kN/m² Density of blading material, p 7850 kg/m³ Maximum allowable centrifugal stress at blade root 1.7 x 10³N/m² Nozzle profile loss coefficient, Yp = (Po1- Poz)/(Po2 - P₂) = 0.06 Taper factor for blade stressing, K = 0.75 In addition the following may be assumed: Atmospheric pressure, p3 102 kPa Ratio of specific heats, y 1.333 Specific heat at constant pressure, Cp 1150 J/(Kg K) In the design calculations values of the parameters at the mean radius are as follows: Stage loading coefficient, = AW/U² =1.2 Flow coefficient,= C/U= 0.35 Isentropic velocity ratio, U/C -0.61 where Co = (2 (h01 - h3ss)) 0.5 Determine (i) the velocity triangles at the mean radius; (ii) the required annulus area (based on the density at the mean radius);

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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The design of a single-stage axial-flow turbine is to be based on constant axial velocity with axial discharge from the rotor blades directly to the atmosphere. The following design values have been specified: Mass flow rate 16.0 kg/s Initial stagnation temperature, T01 1100 K Initial stagnation pressure, po₁ 230 kN/m² Density of blading material, p 7850 kg/m³ Maximum allowable centrifugal stress at blade root 1.7 x 10 N/m² Nozzle profile loss coefficient, YP = (P01- Poz)/(Po2 - P₂) = 0.06 Taper factor for blade stressing, K = 0.75 In addition the following may be assumed: Atmospheric pressure, p3 102 kPa Ratio of specific heats, y 1.333 Specific heat at constant pressure, Cp 1150 J/(kg K) In the design calculations values of the parameters at the mean radius are as follows: Stage loading coefficient, = AW/U² =1.2 Flow coefficient,= Cx/U= 0.35 Isentropic velocity ratio, U/C -0.61 where Co= (2 (h01 - h3ss)) 0.5 Determine (i) the velocity triangles at the mean radius; (ii) the required annulus area (based on the density at the mean radius);
Transcribed Image Text:The design of a single-stage axial-flow turbine is to be based on constant axial velocity with axial discharge from the rotor blades directly to the atmosphere. The following design values have been specified: Mass flow rate 16.0 kg/s Initial stagnation temperature, T01 1100 K Initial stagnation pressure, po₁ 230 kN/m² Density of blading material, p 7850 kg/m³ Maximum allowable centrifugal stress at blade root 1.7 x 10 N/m² Nozzle profile loss coefficient, YP = (P01- Poz)/(Po2 - P₂) = 0.06 Taper factor for blade stressing, K = 0.75 In addition the following may be assumed: Atmospheric pressure, p3 102 kPa Ratio of specific heats, y 1.333 Specific heat at constant pressure, Cp 1150 J/(kg K) In the design calculations values of the parameters at the mean radius are as follows: Stage loading coefficient, = AW/U² =1.2 Flow coefficient,= Cx/U= 0.35 Isentropic velocity ratio, U/C -0.61 where Co= (2 (h01 - h3ss)) 0.5 Determine (i) the velocity triangles at the mean radius; (ii) the required annulus area (based on the density at the mean radius);
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