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通过流量试验对比分析、燃油喷嘴结构分析以及弹簧失效机理分析对某发动机长期存在的冒烟故障的根本原因进行了探索性研究.对冒烟发动机和无冒烟发动机燃油喷嘴及总管流量试验的实证分析表明:发动机冒烟故障的根本原因在于外场服役期间慢车工况某些燃油喷嘴反压降低导致的总管流量不均.对冒烟发动机14个燃油喷嘴的结构实证分析表明:发动机服役中燃油喷嘴及燃油总管流量特性发生漂移的根本原因在于封严弹簧顶紧机制的丧失,而造成顶紧机制丧失的根本原因是弹簧端过度不平导致螺母旋合过程中弹簧在不平端受力不均以致不规则歪倒塑性变形.
Through the comparative analysis of the flow test, the analysis of the structure of the fuel nozzle and the analysis of the failure mechanism of the spring, the root cause of long-term engine smoke failure was explored.Experimental tests on the fuel nozzle and manifold flow test of the smokeless and smokeless engine The analysis shows that the root cause of the engine smoke failure is the uneven flow of the main pipe caused by the decrease of the backpressure of some fuel nozzles in the idle condition during the field operation.Experimental analysis of the structure of 14 fuel nozzles in a smoking engine shows that when the fuel nozzle And the main reason of drifting of the flow characteristics of the main fuel pipe is the loss of the top tightness mechanism of the sealing spring and the fundamental reason of the loss of the top tightness mechanism is that the spring end is over uneven and the spring is unevenly stressed during the screwing of the nut Rules crooked plastic deformation.