Engineering, 25.04.2020 03:51 MNBASKETBALL838

A nine-cylinder radial aircraft engine has a bore of 5.5 inches and a stroke of 5.5 inches and runs at 3500 rpm. Assuming that the brake horsepower of the engine is measured at 600 hp, calculate the brake mean effective pressure (BMEP) the indicated mean effective pressure (IMEP) (hint: assume an appropriate value for ηmech). Farokhi, Saeed. Aircraft Propulsion (Kindle Locations 12000-12003). Wiley. Kindle Edition.

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Answer from: natu2072

BMEP = 3.98154 bar

IMEP = 4.9769 bar

Explanation:

Note:BMEP means Brake Mean Indicated Effective Pressure = 3.98154 bar

IMEP means Indicated mean of Effective Pressure =4.9769 bar.

Please go through the attached files for the step by step solution.

A nine-cylinder radial aircraft engine has a bore of 5.5 inches and a stroke of 5.5 inches and runs

Answer from: stressedstudent101

The brake mean effective pressure is BMEP = 398154.542Pa

The indicated mean effective pressure is IMEP = 338431.36 Pa

Explanation:

From the question we are told that

The number of cylinder is n = 9

The bore diameter is $b = 5.5 \ inches = \frac{5.5 * 2.54}{100} = 0.1397 \ m$

The stroke is $s = 5.5 \ inches = \frac{5.5 * 2.54}{ 100} = 0.1397\ m$

The angular speed is w = 3500 rpm

The break horsepower of engine is $E = 600hp = 600 * 746 = 447.600 \ kW$

Let assume the mechanical effectiveness $\eta mech$ = 85%

The mechanical effectiveness of the engine is mathematically represented

$\eta mech = \frac{[BMEP]}{[IMEP]} *100$

the brake mean effective pressure (BMEP) is mathematically represented as

$B MEP =[ \frac{60 *10^{3} E }{s * a * n * w} ]$

where a is the area of the engine piston which is mathematically as

$a = \frac{\pi}{4} (b)^2$

Substituting values

$a = \frac{\pi}{4} * (0.1397^2)$

$= 0.01532 \ m^2$

Substituting values into the equation for BMEP

$BMEP = \frac{60 *10^{3} * 447.600}{0.1397 * 0.01532 * 3500 * 9}$

BMEP = 398154.542Pa

From the equation of $\eta mech$

We have that

$85 = \frac{[398154. 542]}{[IMEP]} *100$

$0.85 = \frac{[398154. 542]}{[IMEP]}$

IMEP = 398154.52 * 0.85

IMEP = 338431.36 Pa

Answer from: Quest

No clue sorry. just trying to get points to ask my question

Answer from: Quest

answer:

explanation:

assault rifle is a rapid-fire, magazine-fed rifle designed for military use. it is a shoulder-fired weapon that allows the shooter to select between semi-automatic (requiring you pull the trigger for each shot), fully automatic (hold the trigger and the gun continuously fires) or three-shot-burst modes.

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