Year: 2017 Volume: 1 Issue: 1 Page: 6-12
THE EFFECTS OF THERMAL BARRIER COATINGS ON DIESEL ENGINE COMBUSTION, PERFORMANCE AND EMISSION
BASAVARAJ M SHRIGIRI, OMPRAKASH D HEBBAL, K HEMA CHANDRA REDDY
In this investigation, the cylinder head, inlet and exhaust valves of CI engine are coated with metal matrix composite materials by plasma spray technique. Thus, a thermal barrier coating is given for the components of combustion chamber with these coatings. The concept of the low heat rejection (LHR) is to suppress the heat rejection to the cooling water and recovering this heat energy into useful work. The tobacco seed oil (TSO) is chosen as fuel in this study. The TSO has higher viscosity and lower volatility and hence by transesterification method the neat oil is converted into tobacco seed oil methyl ester (TSOME). Initially the experiments are conducted on a normal diesel engine using diesel fuel (DF). Further experiments are carried out on LHR engine using TSO and TSOME. The results obtained from LHR engine are compared with diesel fuel in normal engine. Reduced brake thermal efficiency and slightly increased brake specific energy consumption, as well as increased NOx emissions along with increase in exhaust gas temperature (EGT), carbon monoxide (CO), hydrocarbon (HC) and smoke density are observed for TSO and TSOME in LHR engine compared to diesel fuel in normal engine. Peak pressure and rate of pressure rise are improved with TSOME compared to TSO in LHR engine operation.
Anahtar Kelimeler (Keywords): Low heat rejection engine, tobacco seed oil, tobacco seed oil methyl ester, normal engine, diesel fuel