船舶柴油机第四章第六节.ppt

第四章 燃油喷射与燃烧; 第四章 燃油喷射与燃烧;第六节 提高柴油机功率和经济性的措施;第七节 柴油机排气污染与净化; 一、柴油机排气污染物及其危害;二、柴油机排气污染物生成机理  及控制措施;2．排气污染物控制措施;第八节 电控喷射柴油机;;S70ME;Combustion in CI Engine;In Cylinder Measurements;Combustion in CI Engine;Four Stages of Combustion in CI Engines;CI Engine Types;Combustion Characteristic;Ignition Delay;Fuel Ignition Quality;Cetane Number;The method developed to measure CN uses a standardized single-cylinder engine with variable compression ratio The operating condition is: Inlet temperature (oC) 65.6 Speed (rpm) 900 Spark advance (oBTC) 13 Coolant temperature (oC) 100 Injection pressure (MPa) 10.3 With the engine running at these conditions on the test fuel, the compression ratio is varied until combustion starts at TC, ignition delay period of 13o. The above procedure is repeated using blends of cetane and HMN. The blend that gives a 13o ignition delay with the same compression ratio is used to calculate the test fuel cetane number.;Cetane vs Octane Number;Factors Affecting Ignition Delay;;;SCR catalyst installation