Simulation and experimental study of diesel engine emission temperature based on tunable diode laser absorption spectroscopy

Abstract

Based on the temperature measurement technology of tunable diode laser absorption spectroscopy, the simulation and experimental research on the temperature measurement of CO2 gas emitted by D4114B Diesel engine is realized. The light source model, gas chamber model and data detection model were established by using SIMULINK, which is more general numerical simulation tool in MATLAB. Under the simulated Diesel engine emission environment, the measured CO2 gas temperature was obtained by model simulation and analyzed. The simulation relative error was 0.077%. The marine D4114B Diesel engine was used as the test object, the visual window was reconstructed on the exhaust light path, and an optical path test system was established. The tunable diode laser was used as the detection light source to carry out on-line test research on the CO2 gas temperature in the exhaust gas emission. The relative error was 4.4%. The results show that the model built by SIMULINK can reflect the actual laser modulation effect and CO2 gas absorption. The simulation results have certain reference value for the research of tunable diode laser absorption spectroscopy temperature measurement system.

Simulated methane combustion temperature detection based on TDLAS technology

“…Also based on the advantages of TDLAS technology in temperature detection, direct absorption spectroscopy is used to simulate the detection of temperature using two-line pyrometry. SIMULINK simulation tool in MATLAB is used to build the light source module, the gas chamber module, and the data acquisition module, respectively, to achieve the theoretical temperature detection 9,10 . The measured gas temperatures are obtained and analyzed using model simulation under environmental conditions.…”