DESIGN AND THERMAL ANALYSIS OF EXHAUST VALVES USING IC ENGINES

Abstract

The valves used in the IC engines are of three types: Poppet or mushroom valve or Sleeve valve or Rotary valve. Of these three types, Poppet valve is most commonly used. Since both the inlet and exhaust valves are subjected to high temperatures of 1930°C to 2200°C during the power stroke, therefore, it is necessary that the materials of the valves should withstand these temperatures. The temperature at the inlet valve is less compared to exhaust valve. Thus the inlet valve is generally made of nickel chromium alloy steel and exhaust valve is made of chrome steel. The aim of the project is to design an exhaust valve for a four wheeler diesel engine using theoretical calculations. 2D drawings are drafted from the calculations and 3D model is done in CREO parametric software. Transient thermal analysis is to be done on the exhaust valve when valve is open and closed. Analysis is done in ANSYS. Analysis will be conducted when the study state condition is attained.  Steady state condition is attained at 5000 cycles at the time of when valve is closed is 127.651 sec and valve is opened 127.659 sec. The materials used for exhaust valve is EN52 steel for valve seat Austenitic Stainless Steel for valve tip. Thermal analysis is also done. Transient thermal and thermal analysis is done on the valve by considering only one material EN52 steel. We have also done structural analysis.