Instantaneous Exhaust Temperature Measurements Using Thermocouple Compensation Techniques 2004-01-1418
This paper discusses a method of measuring the instantaneous exhaust gas temperature by thermocouples. Measuring the exhaust gas temperature is useful for a better understanding of engine processes. Thermocouples do not measure the instantaneous exhaust gas temperature because of their limited dynamic response. A thermocouple compensation technique has been developed to estimate the time constant in situ. This method has been commissioned in a simulation study and a controlled experiment with a reference temperature. The studies have shown that the signal bandwidth has to be restricted, since noise will be amplified in the temperature reconstruction. The technique has been successfully applied to some engine exhaust measurements. A comparison between two independent pairs of thermocouples has shown that temperature variations at frequencies up to 80Hz can be recovered. The medium load results agree with a previous study, which used fast response thermometers with a bandwidth of about 50 Hz. However, the results at low load and two different speeds have highlighted the need to do some 1-D unsteady flow simulations, in order to gain more insight into the exhaust process.
Citation: Kar, K., Roberts, S., Stone, R., Oldfield, M. et al., "Instantaneous Exhaust Temperature Measurements Using Thermocouple Compensation Techniques," SAE Technical Paper 2004-01-1418, 2004, https://doi.org/10.4271/2004-01-1418. Download Citation
Author(s):
Kenneth Kar, Stephen Roberts, Richard Stone, Martin Oldfield, Boyd French
Affiliated:
University of Oxford
Pages: 24
Event:
SAE 2004 World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Combustion and Flow Diagnostics-SP-1831, SAE 2004 Transactions Journal of Fuels and Lubricants-V113-4
Related Topics:
Gases
Simulation and modeling
Noise
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