发动机活塞窜气量试验与分析
Test and Analysis of Piston Blow by Gas of Engine

活塞窜气量试验作为可以评定活塞、活塞环、气缸套间配合状态的一种有效手段,是发动机性能试验的重要组成部分。在某发动机循环负荷试验运行100 h后,对其进行活塞窜气量试验,分析活塞活塞环的配合状况。通过对试验数据进行分析,得到了窜气量随转速、平均有效缸内压力的变化规律,以及燃油消耗率和有效热效率随活塞窜气量的变化规律。结合试验结果,对活塞窜气通道进行分析,得到了活塞活塞环的配合情况、发动机转速、缸内平均有效制动压力和发动机排量是影响发动机活塞窜气量的主要因素。
The piston gas leakage test of the engine can be used as an effective method to evaluate the matching state of the piston, piston ring and cylinder, which is an important part of the engine performance test. After 100 hours of operation of a certain engine, the piston gas leakage test is carried out to analyze the matching condition of piston ring. By analyszing the experimental data, we obtain the variation law of the gas leakage varying with engine velocity, the average effective cylinder pressure, and the variation law of the fuel consumption rate and the effective thermal efficiency varying the gas leakage. Based on the experimental results, the gas channel of the piston is analyzed, and the cooperation of piston rings, engine speed, the average effective brake pressure and engine displacement are the main factors affecting the gas flow rate