基于红外测温的柴油机排气温度不均匀度诊断

摘要

设计了柴油机排气红外监测试验台，利用红外热像仪在不同运行工况下测量6135柴油机歧管表面温度，得到了由排气管表面温度确定柴油机排烟气体温度的计算方法。分析了各缸排气歧管表面温度不均匀度与排烟温度不均匀度的关系，研究了表面发射率随温度变化的关系，验证了红外监测技术在柴油机排气不均匀度诊断和预测上的可行性和有效性。%This paper designs a test-bed which is applied to detect exhaust temperature of a diesel engine by infrared measurement. The exhaust pipe surface temperature of 6135 diesel engine in different operating conditions was measured by infrared thermal imager. The calculating method of the discharge temperature of a diesel engine from the surface temperature of exhaust pipe was obtained. The relationship between discharge temperature non-uniformity and the surface temperature non-uniformity of exhaust pipe was analysed. In addition,the feasibility and effectiveness of infrared inspecting technology which is applied to diagnosis and prediction of the diesel engine exhaust temperature non-uniformity was verified.