Brake Mean Effective Pressure

Fig. 7. NO formation for the Provo-Orem bus mn at a compression ratio of 12 1 at 30°C, 3000 rpm, where A is brake mean effective pressure B, brake thermal efficiency and C, oxides of nitrogen, (a) Effect of equivalence ratio, ( ), at a water/H2 mass ratio of 6.0 and spark = 17° before top-dead (BTC) and (b), effect of water injection where (j) = 0.60 and spark = 14°BTC. To convert MPa to psi, multiply by 14.

BMEP—brake mean effective pressure, the theoretical average pressure that would have to be imposed on the pistons of a frictionless engine (of the same dimensions and speed) to produce the same power output as uic engine under consideration a measure of how effectively an engine utilizes its piston displacement to do work. 

Brake mean effective pressure (BMEP) The average cylinder pressure to give a resultant torque at the flywheel. ... 

Many complicating factors determine the actual efficiency and performance characteristics of a pump. Hence, the actual experimental performance of the pump is usually employed. The performance is usually expressed by the pump manufacturer by means of curves called characteristic curves and are usually for water. The head f/ in m produced will be the same for any liquid of the same viscosity. The pressure produced, which is p = Hpg, will be in proportion to the density. Viscosities of less than 0.05 Pa-s (50 cp) have little effect on the head produced. The brake kW varies directly as the density. 

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