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Mechanical Engineering
Engine Finite Heat Release Model (With Heat Transfer) Help
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[QUOTE="DonKiwi, post: 5937664, member: 640555"] Hi, Jason. I just joined this group and spotted an unexpected opportunity to be slightly useful before any chance arises of being a pest later. I notice that the parameters which you listed are in S.I. units (System Internationale to someone of your ancestry, and thankfully a standard used by a very high proportion of the known universe) with the exceptions of 1): Pressure (It should be the base unit of Pascals) and 2): Crank Angle in Degrees. Given that Crank Angle is practicably entered as Degrees, the factor of Π/180 converts Degrees to Radians which is the S.I. unit of angle. The Radian is considered dimensionless, making the units of angular velocity; ω to be [1/seconds] ~ (such that, for example, Torque * angular velocity = Power. [Newton*metres] x [1/second] = [Joules / second] =[Watts] ). Perhaps the value in [kPa] which you may have used, together with your mentioned application of the factor: (1 / 720) have caused your unexpected result. It seems that the "1/720" is a second (partial) adjustment of units to that already made by the "Π/180" (Your question mark after engine speed units suggests doubt). You might also have to audit further because of the "%" cited in the Mass Fraction. Disrupting factors of 1000 ( [kPa/Pa] ) & (1 / 720 ) & 0.01 ( [ % ] / Ratio ) will certainly produce "very weird data". [/QUOTE]
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Engine Finite Heat Release Model (With Heat Transfer) Help
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