Compression  Ratio  and  Clearance  Volume

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DIESEL ENGINES DOE-HDBK-1018/1-93 Diesel Engine Fundamentals Compression  Ratio  and  Clearance  Volume Clearance  volume  is  the volume remaining in the cylinder when the piston is  at TDC. Because  of  the  irregular  shape  of  the  combustion  chamber  (volume  in  the  head)  the clearance volume is calculated empirically by filling the chamber with a measured amount of  fluid  while  the  piston  is  at  TDC.    This  volume  is  then  added  to  the  displacement volume in the cylinder to obtain the cylinders total volume. An engine's compression  ratio is determined by taking the volume of the cylinder with piston at TDC (highest point of travel) and dividing the volume of the cylinder when the piston is at BDC (lowest point of travel), as shown in Figure 15.  This can be calculated by using the following formula: Compression  Ratio                                                                     displacement  volume      clearance  volume clearance  volume Figure 15   Compression Ratio Horsepower Power is the amount of work done per unit time or the rate of doing work.   For a diesel engine,  power  is  rated  in  units  of  horsepower.    Indicated  horsepower  is  the  power transmitted to the pistons by the gas in the cylinders and is mathematically calculated. ME-01 Rev. 0 Page 18


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