1. What is a Flywheel in an Engine?

Definition: A flywheel is a mechanical device that stores rotational energy. In engines, it smooths out power delivery and maintains consistent angular velocity.

Purpose: Flywheels help engines maintain momentum between power strokes, reduce vibration, and provide energy storage for rotational systems.

2. How Does the Calculator Work?

The calculator uses the rotational kinetic energy formula:

Where:

• \( E \) — Kinetic energy (Joules)
• \( I \) — Moment of inertia (kg·m²)
• \( \omega \) — Angular velocity (radians/second)

Explanation: The energy stored in a rotating flywheel depends on how its mass is distributed (moment of inertia) and how fast it's spinning.

3. Importance of Flywheel Calculations

Details: Proper flywheel design ensures smooth engine operation, adequate energy storage, and proper matching to the engine's power characteristics.

4. Using the Calculator

Tips: Enter the flywheel's moment of inertia and its angular velocity. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical moment of inertia for automotive flywheels?
A: Passenger car flywheels typically range from 0.1 to 0.3 kg·m², while heavy-duty applications may be higher.

Q2: How do I convert RPM to rad/s?
A: Multiply RPM by 0.10472 (2π/60). 1000 RPM = 104.72 rad/s.

Q3: Why is energy storage important in flywheels?
A: The stored energy helps maintain engine speed during non-power strokes and when load changes suddenly.

Q4: How does flywheel weight affect performance?
A: Heavier flywheels store more energy but respond slower to speed changes, while lighter ones allow quicker acceleration.

Q5: What are modern flywheel applications?
A: Beyond traditional engines, flywheels are used in energy storage systems, hybrid vehicles, and industrial power quality systems.