Optimization of Gasoline to CNG Engine Conversion using Computer aided Engine Simulation
Among all the alternative fuels available in the market, CNG has so far proved to be the most promising. However, most of its use is limited to retrofitted engines, which has lead to improper utilization of CNG as a spark ignition fuel. This study focuses on efficient utilization of the high calorific value and other desirable properties of CNG by making slight design and operational changes. Performance of engine is studied using a computer aided engine simulation model that evaluates the performance of engine in a virtual working environment. Effect of various parameters on the engine operation is also studied and the valuable data collected in the process is used to alter the operational and design parameters of the engine. In this way engine is tuned for optimum utilization of CNG and its performance is enhanced as compared to the conventional CNG conversion kits.
Effect of Ignition energy on performance and emission of CNG fuelled Bi-fuel Engine : Experimental Investigation
Abstract:The research on alternative fuels for internal combustion engine has become essential due to depletion of petroleum products and its major contribution for pollutants, where Natural gas is one of the most promising fuel alternatives for the future.Most of the CNG fuelled vehicles in India are aftermarket retrofitted conversions from the existing SI engine vehicles. it is found that power produced by the CNG engine is 8-14% less compare to Gasoline engine. To increase the performance of the Bifuel engine there are many parameter which can be optimized. One of them is ignition energy. CNG because of high ignition temperature and low flame speed compare to gasoline for complete combustion higher ignition energy is required.The objective of this research is to improve engine performance and emissions of CNG fuelled SI engine by optimize ignition energy. The Performance and emission both decreased when engine was made to run on CNG instead of Petrol. By increasing ignition parameter like ignition energy performance of Bifuel engine in CNG mode is increasing. And further decreasing in emission is found in CNG mode. BSFC found decreasing, BTE found Increasing, VE found Increasing and HC, CO and CO2found further decreasing in Bifuel engine fuelled with CNG.
Secoiridoids from Olea europaea
Abstract Three new secoiridoids have been isolated from the leaves of Olea europaea along with the previously reported. The compounds were identified by spectral means.