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3 years ago

while performing a running compression test how should running compression compare to static compression

Engineering

1 answer:

algol [13]3 years ago

5 0

Answer:

The idle speed of a running compression should be between 50-75 PSI and that is about half of the static compression.

Explanation:

The Running or Dynamic compression is used to determine how well the cylinder in an engine is absorbing air, reserving it for the proper length of time, and releasing it to the exhaust. The static or cranking compression test is used to check the sealing of the cylinder. Before performing the running compression test, the static compression test is first performed to rule out other issues like bent valves.

The standard value for the static compression is given by;

Compression ratio * 14.7 = Manufacturers Specification

The running compression should always be half of the static compression.

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To develop the problem it is necessary to apply the concepts related to the ideal gas law, mass flow rate and total enthalpy.

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Where,

P = Pressure

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PART A) Using the ideal gas equation to calculate the mass flow,

$PV = mRT$

$\dot{m} = \frac{PV}{RT}$

$\dot{m} = \frac{0.6626*10^{5}*510}{287*311}$

$\dot{m} = 37.85kg/min$

Therfore the mass flow rate at which water condenses, then

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$\dot{m_v} = 0.97*37.85$

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PART B) Enthalpy is given by definition as,

$H= H_a +H_v$

Where,

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3 years ago

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Answer:

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Ierofanga [76]

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