3.3 MUFFLER
A muffler is a device for decreasing the amount of noise emitted by the exhaust of an internal combustion engine. Muffler ssignificantly attenuating noise output from the engine.
Purpose of Muffler:
Performance mufflers have three goals for perfect operation. To absorb and dissipate. To move exhaust gasses, To maintain power and performance of the engine while achieving the first two goals.
About Exhaust Noise
Sound is simply a vibration that spreads as a wave through air. This vibration, or pulses of high and low are pressure, move through the air at the rate of a mile in five-seconds on the average – commonly referred to as “the speed of sound.” In an internal combustion engine, these pulses are created when the exhaust valve opens and the hot gas from the combustion chamber enters the exhaust system. The exhaust gas …show more content…
The pressure drop was calculated empirically by ∆p=((28.4μvL)/d_(h^2 ) )+((0.5ρv^2)/2) (2)
The pressure drop varies in the axial direction with no change in the other two coordinate directions (y and z). Dyy, Dzz and Cyy, Czz were assumed as 1000 times as Dxx and Cxx in practical calculation for a better convergence of the numerical solution. Comparing two equations above, the resistance coefficients in the axial direction were determined by:
D_XX=(28.4)/d_(h^2 ) (3) C_XX=(0.5)/L (4)
Maximum space velocity is a specific manufacturer metric which is the maximum gas flow velocity in the substrate and converted into the peak localized space velocity:
SV = 3600("ρgas" /"ρatmos" )( (Vmax )/L) (5)
Where;
gas is the gas density in kg/m3;
atmos is the gas density at 25C and at 101325 Pa;
Vmax the maximum gas velocity in
A muffler is a device for decreasing the amount of noise emitted by the exhaust of an internal combustion engine. Muffler ssignificantly attenuating noise output from the engine.
Purpose of Muffler:
Performance mufflers have three goals for perfect operation. To absorb and dissipate. To move exhaust gasses, To maintain power and performance of the engine while achieving the first two goals.
About Exhaust Noise
Sound is simply a vibration that spreads as a wave through air. This vibration, or pulses of high and low are pressure, move through the air at the rate of a mile in five-seconds on the average – commonly referred to as “the speed of sound.” In an internal combustion engine, these pulses are created when the exhaust valve opens and the hot gas from the combustion chamber enters the exhaust system. The exhaust gas …show more content…
The pressure drop was calculated empirically by ∆p=((28.4μvL)/d_(h^2 ) )+((0.5ρv^2)/2) (2)
The pressure drop varies in the axial direction with no change in the other two coordinate directions (y and z). Dyy, Dzz and Cyy, Czz were assumed as 1000 times as Dxx and Cxx in practical calculation for a better convergence of the numerical solution. Comparing two equations above, the resistance coefficients in the axial direction were determined by:
D_XX=(28.4)/d_(h^2 ) (3) C_XX=(0.5)/L (4)
Maximum space velocity is a specific manufacturer metric which is the maximum gas flow velocity in the substrate and converted into the peak localized space velocity:
SV = 3600("ρgas" /"ρatmos" )( (Vmax )/L) (5)
Where;
gas is the gas density in kg/m3;
atmos is the gas density at 25C and at 101325 Pa;
Vmax the maximum gas velocity in