INTERNATIONAL RESEARCH JOURNAL OF AUTOMOTIVE TECHNOLOGY (IRJAT) http://www.mapletreejournals.com/index.php/IRJAT Received 20 November 2018 ISSN 2581-5865 Accepted 25 November 2018 2018; 1(6);18-32 Published online 30 November 2018 Thermal Analysis on Exhaust Valve with Thermal Barrier Material Chowdavaram Sai Prasad 1* , M. Babu 2 , S. Sachin Raj 3 1 Student, Department of Mechanical Engg, Narsimha Reddy Engg College, Hyderabad, India - 500100. 2 Professor, Department of Mechanical Engg, Narsimha Reddy Engg College, Hyderabad, India-500100, 3 Assistant Professor, Department of Mechanical Engg, Gnanamani College of Technology, Namakkal, India-637018. *Corresponding author E-Mail ID: bobbyb4u@gmail.com ABSTRACT An exhaust valve is the important component in the engine system due to its direct involvement in the combustion and experiencing the high temperature and pressure from the hot gases during the exhaust stroke based on the valve timing for opening and closing. Because of this exposure to exhaust, high thermal loads are induced which leads to the failure of the valve. Therefore, a cooling provision is must to reduce the temperatures due to heat transfer effect or to increase the heat dissipation rate through valve by maintaining it at optimum thermal conditions. The cooling provisions are by filling the valve with sodium making valve hollow inside or by using the thermal barrier coatings on the outer surface of valve. In this an attempt is made to study the importance of cooling provision by doing thermal analysis on the valve geometry with different approaches under full load conditions of engine. The valve geometry is modelled using CAD software and the thermal analysis at steady state is done using Ansys under FEA basis. The expected results are temperature variation, heat flux, rate of heat transfer. Keywords: Exhaust valve, cooling provision, sodium, thermal barrier coatings (TBC’s), thermal analysis, Ansys Fluent, temperature distribution, heat transfer rate. 1. INTRODUCTION The engine system consists of two valves (inlet and exhaust) plays a key role in the continuous working by letting in fresh air and burnt gases out from combustion chamber as per valve timing for open and close accordingly during the thermodynamic cycle. Both the valves experience the same effects from the combustion but the exhaust valve is critical facing the hot gases, subjecting to the thermal loads due to combustion and flow of gases [1]. With respect to the valve sub divisions, the valve head faces directly to the combusted gases. The valve seat and stem are subjected to the most severe conditions due to the flow of hot gases. To withstand all this thermal effect at various operating conditions, the valve material must possess high temperature properties like hardness, thermal conductivity, fatigue strength etc. Choosing the proper material for the valve having properties to bear high thermal loads can reduce the failure and improve the life. Apart from the material selection, adoption of cooling method can also improve the performance by reducing the thermal effects on the valve [2].