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I have a P-V trace for a wide open throttle and a part load. Is it possible to calculate the BMEP from these graphs?
xxChrisxx said:Integrating real curves is a *****, either find a program that can make approximate curves from a set of data points or break out the graph paper.
Actually, if you used the average pressure between two datapoints then you used the trapezoid rule! :)xxChrisxx said:Those are two marvellous suggestions. I feel especially silly about the numerical integration in excel as that is probably the easiest way to do it, I should have known that but never even thought to use the trapezoid rule. :(
The BMEP, or brake mean effective pressure, can be calculated by dividing the area under the P-V curve by the displacement volume of the engine. This can be done by hand using a ruler to measure the area or by using computer software.
BMEP is typically measured in units of pressure, such as pounds per square inch (psi) or kilopascals (kPa). However, it is important to use consistent units throughout the calculation to ensure accuracy.
Yes, BMEP can be calculated for any type of engine as long as the engine's P-V curve is available. However, it is important to note that BMEP is typically used for internal combustion engines.
BMEP is a measure of the average pressure exerted on the piston during the power stroke of an engine. It is used to evaluate the efficiency and power output of an engine. Higher BMEP values indicate better engine performance.
While BMEP is a useful metric for evaluating engine performance, it does have some limitations. It does not take into account factors such as engine size, speed, or fuel type, and it may not accurately reflect real-world driving conditions. It is best used in conjunction with other performance measurements for a more comprehensive analysis.