Two entered rotor diameters are compared at one entered rotational speed. Their rim speeds scale directly with diameter, while angular speed is common.
Wilkinson's Steam Turbine Interactive Calculator
Enter two diameters and one RPM. Results are kinematic rim-speed comparisons only—not turbine thermodynamics, blade loading or safe-speed limits.
Equation Used
- Both rotors are rigid and share the entered RPM.
- Diameter is the circular path diameter used for rim speed.
- Tip gain is relative to the first diameter.
- No steam flow, pressure, efficiency or power is modeled.
- Centrifugal stress, vibration, balance, materials and safety are omitted.
Shared-RPM Rim-Speed Comparison
Use the comparison to see how diameter changes rim speed at a fixed RPM. Steam flow, power and efficiency require additional information and are not calculated here.
What This Calculator Represents
Two circular path speeds at a common RPM.
Rim-Speed comparison
v=omegaD/2
gain=100(v2/v-1)
Worked Scenario
At 8,000 rpm, 150 mm and 250 mm paths have rim speeds about 62.8 and 104.7 m/s; the larger is 66.7% higher.
Assumptions and Limits
No steam thermodynamics, power, efficiency, blade loading, stress or safe-speed analysis is included.
Frequently Asked Questions
Is this turbine power?
No.
Is RPM predicted?
No.
Does diameter change angular speed?
Not here.
Is tip gain an efficiency gain?
No.
Are stresses checked?
No.
Can this approve a rotor?
No.
References
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