Brake Power Given Bore And Stroke Calculator

Formula Used:

\[ \text{Brake Power of 4 Stroke} = \frac{\eta_m \times \text{IMEP} \times A \times L \times \frac{N}{2} \times N_c}{60} \]

Mechanical Efficiency (ηm):

(0-1)

Indicated Mean Effective Pressure (IMEP):

Pascal

Piston Area (A):

m²

Stroke of Piston (L):

RPM (N):

RPM

Number of Cylinders (Nc):

Brake Power of 4 Stroke:

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1. What is Brake Power?

Brake Power is the output of the engine at the shaft measured by a dynamometer in a 4 stroke diesel engine. It represents the actual usable power delivered by the engine.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \text{Brake Power of 4 Stroke} = \frac{\eta_m \times \text{IMEP} \times A \times L \times \frac{N}{2} \times N_c}{60} \]

Where:

\( \eta_m \) — Mechanical Efficiency
\( \text{IMEP} \) — Indicated Mean Effective Pressure (Pascal)
\( A \) — Piston Area (m²)
\( L \) — Stroke of Piston (m)
\( N \) — RPM (Rotation per Minute)
\( N_c \) — Number of Cylinders

Explanation: This formula calculates the brake power by considering mechanical efficiency, mean effective pressure, piston characteristics, engine speed, and number of cylinders.

3. Importance of Brake Power Calculation

Details: Accurate brake power calculation is crucial for engine performance evaluation, power output measurement, and engine design optimization in automotive and industrial applications.

4. Using the Calculator

Tips: Enter mechanical efficiency (0-1), indicated mean effective pressure in Pascal, piston area in m², stroke length in m, RPM, and number of cylinders. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between brake power and indicated power?
A: Brake power is the actual power output at the engine shaft, while indicated power is the power developed inside the engine cylinders.

Q2: Why divide RPM by 2 in the formula?
A: In a 4-stroke engine, each cylinder produces power once every two revolutions, hence the division by 2.

Q3: What is mechanical efficiency?
A: Mechanical efficiency is the ratio of brake power to indicated power, representing how effectively the engine converts indicated power to usable brake power.

Q4: How is IMEP measured?
A: IMEP is typically calculated from indicator diagrams that show pressure-volume relationships during engine cycles.

Q5: What are typical brake power values for diesel engines?
A: Brake power values vary widely depending on engine size and application, ranging from a few kilowatts for small engines to several megawatts for large industrial engines.