Draft Tube Pressure Recovery Calculator

Hydraulic Turbines (Francis & Kaplan): Calculate diffuser kinetic energy conversion, suction head, runner exit pressure, and cavitation margin.

Inlet Diameter $D_1$ (m):

Exit Area $A_2$ ($m^2$):

Turbine Discharge $Q$ ($m^3/s$):

Net Turbine Head $H_{net}$ (m):

Diffuser Loss Coeff $K_{loss}$:

Suction Height $z_s$ (m):

Barometric Head $H_{atm}$ (m):

Vapor Pressure Head $H_{vap}$ (m):

Recovery Coeff ($C_p$)

Diffuser Efficiency $\eta_{dt}$

-- %

Runner Exit Head ($h_1$)

-- m abs

Thoma Sigma ($\sigma$)

• Runner Exit Velocity ($V_1$): -- m/s

• Tailrace Exit Velocity ($V_2$): -- m/s

• Inlet Dynamic Velocity Head ($V_1^2 / 2g$): -- m

• Static Head Recovered ($\Delta h_{rec}$): -- m

• Cavitation Assessment: --

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