Thermocouples (TCs) are commonly used to measure exhaust gas temperature during automotive engineering experiments. To enhance the durability of TCs in the harsh exhaust gas environment, in many cases larger tip TCs (such as 1/8″ diameter) are used rather than smaller TCs. However, the signal from a larger thermocouple can differ significantly from that of small TC due to thermal capacitance of the tip, heat transfer to the exhaust pipe wall via conduction and radiation, and convection with exhaust gas. A model has been developed that calculates the effects of these factors and provides an estimate, for TCs of different sizes, of exhaust gas temperature. Experiments were performed to validate the model under transient (FTP) engine dynamometer conditions utilizing three popular TC sizes (1/32″, 1/16″, and 1/8″). Good correlation was found among predictions for various TC sizes. This analytical tool enhances the quality of exhaust gas temperature measurements and enables a useful alternative to the practice of using fragile (low durability) small tip TCs for experiments requiring accurate temperature measurements.


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    Title :

    Converting Raw Thermocouple Measurements to Those Measured with a Thermocouple of a Different Size


    Additional title:

    Sae Technical Papers


    Contributors:
    Son, Seha (author)

    Conference:

    SAE World Congress & Exhibition ; 2009



    Publication date :

    2009-04-20




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    2009-01-1113 Converting Raw Thermocouple Measurements to Those Measured with a Thermocouple of a Different Size

    Son, S. / Society of Automotive Engineers | British Library Conference Proceedings | 2009



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